Web Technologies Manual

201

Gokaraju Rangaraju Institute of Engineering and Technology

Web Technologies Lab Manual

N.V.Ganapathi Raju. Associate Professor

2006

MCA_Dept GRIET

1/1/2006

Advanced JAVA Lab Manual Dept., of MCA GRIET

Contents

JDBC( Java Database Concetivity)

SWINGS

SERVLETS

JSP( Java Server Pages)

Softwares required to run the programs

JDK1.5

Tomcat Web Server 5.1

Eclipse 3.1.2

Oracle 8i/ MS-Access

Internet Explorer


JDBC PROGRAMS

JDBC driver types

JDBC drivers are divided into four types or levels. Each type defines a JDBC driver implementation with increasingly higher levels of platform independence, performance, and deployment administration. The four types are:

Type 1: JDBC-ODBC Bridge Type 2: Native-API/partly Java driver Type 3: Net-protocol/all-Java driver

Type 4: Native-protocol/all-Java driver

Type 1: JDBC-ODBC Bridge The type 1 driver, JDBC-ODBC Bridge, translates all JDBC calls into ODBC (Open DataBase Connectivity) calls and sends them to the ODBC driver. As such, the ODBC driver, as well as, in many cases, the client database code, must be present on the client machine. Figure 1 shows a typical JDBC-ODBC Bridge environment.

Figure 1. Type 1: JDBC-ODBC Bridge

Pros The JDBC-ODBC Bridge allows access to almost any database, since the database's ODBC drivers are already available. Type 1 drivers may be useful for those companies that have an ODBC driver already installed on client machines.

Cons

The performance is degraded since the JDBC call goes through the bridge to the ODBC driver, then to the native database connectivity interface. The

result comes back through the reverse process. Considering the performance issue, type 1 drivers may not be suitable for large-scale applications.

The ODBC driver and native connectivity interface must already be installed on the client machine. Thus any advantage of using Java applets in an intranet environment is lost, since the deployment problems of traditional applications remain.


Type 2: Native-API/partly Java driver JDBC driver type 2 -- the native-API/partly Java driver -- converts JDBC calls into database-specific calls for databases such as SQL Server, Informix, Oracle, or Sybase. The type 2 driver communicates directly with the database server; therefore

it requires that some binary code be present on the client machine.

Figure 2. Type 2: Native-API/partly Java driver

Pros Type 2 drivers typically offer significantly better performance than the JDBC-ODBC

Bridge.

Cons The vendor database library needs to be loaded on each client machine. Consequently, type 2 drivers cannot be used for the Internet. Type 2 drivers show lower performance than type 3 and type 4 drivers.

Type 3: Net-protocol/all-Java driver JDBC driver type 3 -- the net-protocol/all-Java driver -- follows a three-tiered approach whereby the JDBC database requests are passed through the network to the middle-tier server. The middle-tier server then translates the request (directly or indirectly) to the database-specific native-connectivity interface to further the request to the database server. If the middle-tier server is written in Java, it can use a type 1 or type 2 JDBC driver to do this.


Figure 3. Type 3: Net-protocol/all-Java driver

Pros

The net-protocol/all-Java driver is server-based, so there is no need for any vendor database library to be present on client machines. Further, there are many opportunities to optimize portability, performance, and scalability. Moreover, the net protocol can be designed to make the client JDBC driver very small and fast to load. Additionally, a type 3 driver typically provides support for features such as caching (connections, query results, and so on), load balancing, and advanced system

administration such as logging and auditing.

Cons Type 3 drivers require database-specific coding to be done in the middle tier. Additionally, traversing the recordset may take longer, since the data comes through the backend server.

Type 4: Native-protocol/all-Java driver The native-protocol/all-Java driver (JDBC driver type 4) converts JDBC calls into the vendor-specific database management system (DBMS) protocol so that client applications can communicate directly with the database server. Level 4 drivers are completely implemented in Java to achieve platform independence and eliminate deployment administration issues.


Figure 4. Type 4: Native-protocol/all-Java driver

Pros Since type 4 JDBC drivers don't have to translate database requests to ODBC or a native connectivity interface or to pass the request on to another server, performance is typically quite good. Moreover, the native-protocol/all-Java driver boasts better performance than types 1 and 2. Also, there's no need to install special software on the client or server. Further, these drivers can be downloaded

dynamically.

Cons With type 4 drivers, the user needs a different driver for each database.

1.program for inserting one new record into DB

/* JDBC program for inserting one new record into DB */

//InsertDemo.java

import java.sql.*;

public class InsertDemo

{

public static void main(String args[]) throws Exception

{

// Load JDBC driver

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

// obtain con

Connection con=DriverManager.getConnection("jdbc:odbc:mydsn", "scott",

"tiger");

Statement stmt=con.createStatement();

/*

insert into emp (empno, ename, deptno) values(1, 'scott', 10)

*/

String sql="insert into emp (empno, ename, deptno) values

("+Integer.parseInt(args[0])+",'"+args[1]+"',"+Integer.parseInt(args[2]

)+")";

stmt.executeUpdate(sql);

stmt.close();

con.close();

}//main()

}// class


2.Prg to select data from table // Prg to select data from table

// SelectTest.java

import java.sql.*;

public class SelectTest

{

public static void main(String rags[]) throws Exception

{

// Loading JDBC driver class


// Obtain one Connection object


"tiger");

// Obtain Statement


// execute query

ResultSet rs=stmt.executeQuery("select * from dept");

while(rs.next())

{

System.out.println(rs.getInt(1));

System.out.println(rs.getString(2));

}// while()

rs.close();

stmt.close();

con.close();

}// main()

}// class


3. insert data into the table using PreparedStatement /*

This program demonstrates inserting one record into DB with the help of

PreparedStatement object

*/

// PreInsertDemo.java

import java.sql.*;

public class PreInsertDemo

{


{



"tiger");

PreparedStatement pstmt=con.prepareStatement("insert into emp (empno,

ename, deptno) values (?, ?, ?)");

pstmt.setInt(1, Integer.parseInt(rags[0]));

pstmt.setString(2, rags[1]);

pstmt.setInt(3, Integer.parseInt(rags[2]));

pstmt.executeUpdate();

pstmt.close();

con.close();

}//main()

}// class


// 4.RSMetaDataTest.java import java.sql.*;

import java.util.*;

public class RSMetaData

{


{


Connection con=DriverManager.getConnection("jdbc:odbc:mydsn","scott",

"tiger");


ResultSet rs=stmt.executeQuery("select * from emp");

ResultSetMetaData meta=rs.getMetaData();

int colCount=meta.getColumnCount();

for(int i=1;i<=colCount;i++)

{

System.out.print(meta.getColumnName(i)+":"+meta.getColumnType(i)+" |

");

}

System.out.println();

while(rs.next())

{

for(int i=1; i<=colCount; i++)

{

System.out.print(rs.getString(i)+" | ");

}

System.out.println();

}// while()

rs.close();

stmt.close();

con.close();

}// main()

}// class


// 5.Database MetadataTest // TableData.java

import java.io.*;

import java.sql.*;

public class TableData

{


{


Connection c=DriverManager.getConnection("jdbc:odbc:nvgr");

String x[]={"TABLE"};

DatabaseMetaData dbmd=c.getMetaData();

ResultSet rs=dbmd.getTables(null,null,null,x);

while(rs.next())

{


}

rs.close();

c.close();

}

}


//6.DatabaseMetadataTest //ColumnTest.java

import java.SQL.*;

public class ColumnTest

{


{

Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver");

Connection c=DriverManager.getConnetion(“jdbc:odbc:mydsn","scott",

"tiger");

DatabaseMetaData dbmd=c.getMetaData();

DataInputStream dis=new DataInputStream(System.in);

System.out.println(“enter table name”);

String t[]={“TABLE”}

ResultSet rs=dbmd.getColumns(null,null,t,null);

While(rs.next())

{

System.out.println(“Col Name is” + rs.getString(4));

System.out.println(“Data Type is” + rs.getString(6));

System.out.println(“Size is” + rs.getInt(7));

}

rs.close();

c.close();

dis.close();

}

}


/* 7.Requesting PROCEDURES available in the DB

create or replace procedure emp_sal_proc(eno IN number, sal1 OUT

number) IS

BEGIN

SELECT sal INTO sal1 FROM emp WHERE empno=eno;

END;

/

exit

*/

// ProcExecDemo.java

import java.sql.*;

public class ProcExecDemo

{


{



"tiger");

CallableStatement cstmt=con.prepareCall("{call emp_sal_proc(?,?)}");

cstmt.setInt(1, Integer.parseInt(rags[0]));

cstmt.registerOutParameter(2, Types.DOUBLE);

cstmt.execute();

System.out.println(cstmt.getDouble(2));

cstmt.close();

con.close();

}// main()

}// class


/*

8.Requesting function from JDBC program

Function creation:

create or replace function emp_sal_func(eno IN number) return number IS

sal1 number;

BEGIN

SELECT sal INTO sal1 FROM emp WHERE empno=eno;

return sal1;

END;

/

exit

*/

// FuncExecDemo.java

import java.sql.*;

public class FuncExecDemo

{


{

DriverManager.registerDriver(new sun.jdbc.odbc.JdbcOdbcDriver());


"tiger");

CallableStatement cstmt=con.prepareCall("{?=call emp_sal_func(?)}");

cstmt.setInt(2, Integer.parseInt(rags[0]));

cstmt.registerOutParameter(1, Types.DOUBLE);

cstmt.execute();

System.out.println(cstmt.getDouble(1));

cstmt.close();

con.close();

}// main()

}// class


/* 9.Example on Updatable RS */

// URSDemo.java

import java.sql.*;

public class URSDemo

{


{

new oracle.jdbc.driver.OracleDriver();

Connection

con=DriverManager.getConnection("jdbc:oracle:thin:@abc:1521:net",

"scott", "tiger");

Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,

ResultSet.CONCUR_UPDATABLE);

ResultSet rs=stmt.executeQuery("SELECT * FROM dept");

rs.absolute(6);

//rs.updateString("DNAME", "HumanR");

//rs.updateRow();

rs.deleteRow();

rs.beforeFirst();

while(rs.next())

{


}// while()

rs.close();

stmt.close();

con.close();

}// main()

}// class

/*

to update a column value in the current row. In a scrollable ResultSet

object, the cursor can be moved backwards and forwards, to an absolute

position, or to a position relative to the current row. The following

code fragment updates the NAME column in the fifth row of the ResultSet

object rs and then uses the method updateRow to update the data source

table from which rs was derived.

rs.absolute(5);

rs.updateString("NAME", "AINSWORTH");

rs.updateRow();

*/


/* 10.Example on Scrollable ResultSet */

// SRSDemo.java

import java.sql.*;

public class SRSDemo

{


{

new sun.jdbc.odbc.JdbcOdbcDriver();


"tiger");

Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,

ResultSet.CONCUR_READ_ONLY);

ResultSet rs=stmt.executeQuery("SELECT * FROM dept");

rs.afterLast();

while(rs.previous())

{

System.out.println(rs.getInt(1)+":"+rs.getString(2)+":"+rs.getString(3)

);

}// while()

Thread.sleep(1000*30);

while(rs.next())

{

rs.refreshRow();

System.out.println(rs.getInt(1)+":"+rs.getString(2)+":"+rs.getString(3)

);

}// while()

rs.close();

stmt.close();

con.close();

}// main()

}// class

/*

update dept set dname='HR' where deptno=70;

*/


/* program on Batch updations

11. Example: MoneyTransfer system

TransferMoneyDemo.java */ //Transactions using JDBC

import java.sql.*;

public class TransferMoneyDemo

{


{


Connection con=DriverManager.getConnection("jdbc:odbc:MySQLDSN");


con.setAutoCommit(false);

stmt.addBatch("update account1 set bal=bal-

"+Double.valueOf(rags[1]).doubleValue()+" where

accNo="+Integer.parseInt(rags[0]));

stmt.addBatch("update account1 set

bal=bal+"+Double.valueOf(rags[1]).doubleValue()+" where

accNo="+Integer.parseInt(rags[2]));

int i[]=stmt.executeBatch();

if(i[0]==1 && i[1]==1)

{

con.commit(); flag=true;

}

else

{

con.rollback(); flag=false;

}// else

System.out.println("TX status is : "+flag);

stmt.close();

con.close();

}// main()

static boolean flag;

}// class

/*

Convert String - double

old:

Double d=Double.valueOf(str);

double d1=d.doubleValue();

new:

double d=Double.parseDouble(str);

*/

/*

create table account1 (accNo integer PRIMARY KEY, bal integer);


insert into account1 values(1, 10000.00);

insert into account1 values(2, 20000.00);

commit;*/

SWINGS PROGRAMS

//1. ShowColors.java

// Demonstrating Colors.

import java.awt.*;

import javax.swing.*;

public class ShowColors extends JFrame {

// constructor sets window's title bar string and dimensions

public ShowColors()

{

super( "Using colors" );

setSize( 400, 130 );

setVisible( true );

}

// draw rectangles and Strings in different colors

public void paint( Graphics g )

{

// call superclass's paint method

super.paint( g );

// set new drawing color using integers

g.setColor( new Color( 255, 0, 0 ) );

g.fillRect( 25, 25, 100, 20 );

g.drawString( "Current RGB: " + g.getColor(), 130, 40 );

// set new drawing color using floats

g.setColor( new Color( 0.0f, 1.0f, 0.0f ) );

g.fillRect( 25, 50, 100, 20 );


// set new drawing color using static Color objects

g.setColor( Color.BLUE );

g.fillRect( 25, 75, 100, 20 );


// display individual RGB values

Color color = Color.MAGENTA;

g.setColor( color );

g.fillRect( 25, 100, 100, 20 );

g.drawString( "RGB values: " + color.getRed() + ", " +

color.getGreen() + ", " + color.getBlue(), 130, 115 );

} // end method paint

// execute application


public static void main( String args[] )

{

ShowColors application = new ShowColors();

application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

}

} // end class ShowColors

//2. Fonts.java

// Using fonts.

import java.awt.*;


public class Fonts extends JFrame {

// set window's title bar and dimensions

public Fonts()

{

super( "Using fonts" );

setSize( 420, 125 );

setVisible( true );

}

// display Strings in different fonts and colors


{

// call superclass's paint method

super.paint( g );

// set font to Serif (Times), bold, 12pt and draw a string

g.setFont( new Font( "Serif", Font.BOLD, 12 ) );

g.drawString( "Serif 12 point bold.", 20, 50 );

// set font to Monospaced (Courier), italic, 24pt and draw a

string

g.setFont( new Font( "Monospaced", Font.ITALIC, 24 ) );

g.drawString( "Monospaced 24 point italic.", 20, 70 );

// set font to SansSerif (Helvetica), plain, 14pt and draw a

string

g.setFont( new Font( "SansSerif", Font.PLAIN, 14 ) );

g.drawString( "SansSerif 14 point plain.", 20, 90 );

// set font to Serif (Times), bold/italic, 18pt and draw a string

g.setColor( Color.RED );

g.setFont( new Font( "Serif", Font.BOLD + Font.ITALIC, 18 ) );

g.drawString( g.getFont().getName() + " " + g.getFont().getSize()

+

" point bold italic.", 20, 110 );





{

Fonts application = new Fonts();


}

} // end class Fonts

//3. Metrics.java

// FontMetrics and Graphics methods useful for obtaining font metrics.

import java.awt.*;


public class Metrics extends JFrame {

// set window's title bar String and dimensions

public Metrics()

{

super( "Demonstrating FontMetrics" );

setSize( 510, 210 );

setVisible( true );

}

// display font metrics


{

super.paint( g ); // call superclass's paint method

g.setFont( new Font( "SansSerif", Font.BOLD, 12 ) );

FontMetrics metrics = g.getFontMetrics();

g.drawString( "Current font: " + g.getFont(), 10, 40 );

g.drawString( "Ascent: " + metrics.getAscent(), 10, 55 );

g.drawString( "Descent: " + metrics.getDescent(), 10, 70 );

g.drawString( "Height: " + metrics.getHeight(), 10, 85 );

g.drawString( "Leading: " + metrics.getLeading(), 10, 100 );

Font font = new Font( "Serif", Font.ITALIC, 14 );

metrics = g.getFontMetrics( font );

g.setFont( font );

g.drawString( "Current font: " + font, 10, 130 );

g.drawString( "Ascent: " + metrics.getAscent(), 10, 145 );

g.drawString( "Descent: " + metrics.getDescent(), 10, 160 );

g.drawString( "Height: " + metrics.getHeight(), 10, 175 );

g.drawString( "Leading: " + metrics.getLeading(), 10, 190 );




{

Metrics application = new Metrics();


}


} // end class Metrics

// 4 LinesRectsOvals.java

// Drawing lines, rectangles and ovals.

import java.awt.*;


public class LinesRectsOvals extends JFrame {


public LinesRectsOvals()

{

super( "Drawing lines, rectangles and ovals" );

setSize( 400, 165 );

setVisible( true );

}

// display various lines, rectangles and ovals


{


g.setColor( Color.RED );

g.drawLine( 5, 30, 350, 30 );

g.setColor( Color.BLUE );

g.drawRect( 5, 40, 90, 55 );

g.fillRect( 100, 40, 90, 55 );

g.setColor( Color.CYAN );

g.fillRoundRect( 195, 40, 90, 55, 50, 50 );

g.drawRoundRect( 290, 40, 90, 55, 20, 20 );

g.setColor( Color.YELLOW );

g.draw3DRect( 5, 100, 90, 55, true );

g.fill3DRect( 100, 100, 90, 55, false );

g.setColor( Color.MAGENTA );

g.drawOval( 195, 100, 90, 55 );

g.fillOval( 290, 100, 90, 55 );




{

LinesRectsOvals application = new LinesRectsOvals();


}

} // end class LinesRectsOvals


// 5.DrawArcs.java // Drawing arcs.

import java.awt.*;


public class DrawArcs extends JFrame {


public DrawArcs()

{

super( "Drawing Arcs" );

setSize( 300, 170 );

setVisible( true );

}

// draw rectangles and arcs


{


// start at 0 and sweep 360 degrees


g.drawRect( 15, 35, 80, 80 );

g.setColor( Color.BLACK );

g.drawArc( 15, 35, 80, 80, 0, 360 );



g.drawRect( 100, 35, 80, 80 );


g.drawArc( 100, 35, 80, 80, 0, 110 );

// start at 0 and sweep -270 degrees


g.drawRect( 185, 35, 80, 80 );


g.drawArc( 185, 35, 80, 80, 0, -270 );


g.fillArc( 15, 120, 80, 40, 0, 360 );


g.fillArc( 100, 120, 80, 40, 270, -90 );


g.fillArc( 185, 120, 80, 40, 0, -270 );




{

DrawArcs application = new DrawArcs();



}

} // end class DrawArcs

// 6. DrawPolygons.java // Drawing polygons.

import java.awt.*;


public class DrawPolygons extends JFrame {


public DrawPolygons()

{

super( "Drawing Polygons" );

setSize( 275, 230 );

setVisible( true );

}

// draw polygons and polylines


{


int xValues[] = { 20, 40, 50, 30, 20, 15 };

int yValues[] = { 50, 50, 60, 80, 80, 60 };

Polygon polygon1 = new Polygon( xValues, yValues, 6 );

g.drawPolygon( polygon1 );

int xValues2[] = { 70, 90, 100, 80, 70, 65, 60 };

int yValues2[] = { 100, 100, 110, 110, 130, 110, 90 };

g.drawPolyline( xValues2, yValues2, 7 );

int xValues3[] = { 120, 140, 150, 190 };

int yValues3[] = { 40, 70, 80, 60 };

g.fillPolygon( xValues3, yValues3, 4 );

Polygon polygon2 = new Polygon();

polygon2.addPoint( 165, 135 );





g.fillPolygon( polygon2 );




{

DrawPolygons application = new DrawPolygons();



}

} // end class DrawPolygons

// 7 LabelTest.java

// Demonstrating the JLabel class.

import java.awt.*;

import java.awt.event.*;


public class LabelTest extends JFrame {

private JLabel label1, label2, label3;

// set up GUI

public LabelTest()

{

super( "Testing JLabel" );

// get content pane and set its layout

Container container = getContentPane();

container.setLayout( new FlowLayout() );

// JLabel constructor with a string argument

label1 = new JLabel( "Label with text" );

label1.setToolTipText( "This is label1" );

container.add( label1 );

// JLabel constructor with string, Icon and alignment arguments

Icon bug = new ImageIcon( "bug1.gif" );

label2 = new JLabel( "Label with text and icon", bug,

SwingConstants.LEFT );



// JLabel constructor no arguments

label3 = new JLabel();

label3.setText( "Label with icon and text at bottom" );

label3.setIcon( bug );

label3.setHorizontalTextPosition( SwingConstants.CENTER );

label3.setVerticalTextPosition( SwingConstants.BOTTOM );



setSize( 275, 170 );

setVisible( true );

} // end constructor


{

LabelTest application = new LabelTest();


}

} // end class LabelTest


// 8 ButtonTest.java // Creating JButtons.

import java.awt.*;



public class ButtonTest extends JFrame {

private JButton plainButton, fancyButton;

// set up GUI

public ButtonTest()

{

super( "Testing Buttons" );




// create buttons

plainButton = new JButton( "Plain Button" );

container.add( plainButton );

Icon bug1 = new ImageIcon( "bug1.gif" );

Icon bug2 = new ImageIcon( "bug2.gif" );

fancyButton = new JButton( "Fancy Button", bug1 );

fancyButton.setRolloverIcon( bug2 );

container.add( fancyButton );

// create an instance of inner class ButtonHandler

// to use for button event handling

ButtonHandler handler = new ButtonHandler();

fancyButton.addActionListener( handler );

plainButton.addActionListener( handler );

setSize( 275, 100 );

setVisible( true );

} // end ButtonTest constructor


{

ButtonTest application = new ButtonTest();


}

// inner class for button event handling

private class ButtonHandler implements ActionListener {

// handle button event

public void actionPerformed( ActionEvent event )

{

JOptionPane.showMessageDialog( ButtonTest.this,

"You pressed: " + event.getActionCommand() );


}

} // end private inner class ButtonHandler

} // end class ButtonTest

//9 TextFieldTest.java // Demonstrating the JTextField class.

import java.awt.*;



public class TextFieldTest extends JFrame {

private JTextField textField1, textField2, textField3;

private JPasswordField passwordField;

// set up GUI

public TextFieldTest()

{

super( "Testing JTextField and JPasswordField" );



// construct textfield with default sizing

textField1 = new JTextField( 10 );

container.add( textField1 );

// construct textfield with default text

textField2 = new JTextField( "Enter text here" );


// construct textfield with default text,

// 20 visible elements and no event handler

textField3 = new JTextField( "Uneditable text field", 20 );

textField3.setEditable( false );


// construct passwordfield with default text

passwordField = new JPasswordField( "Hidden text" );

container.add( passwordField );

// register event handlers

TextFieldHandler handler = new TextFieldHandler();

textField1.addActionListener( handler );



passwordField.addActionListener( handler );

setSize( 325, 100 );

setVisible( true );

} // end constructor TextFieldTest


{

TextFieldTest application = new TextFieldTest();


}


// private inner class for event handling

private class TextFieldHandler implements ActionListener {

// process textfield events


{

String string = "";

// user pressed Enter in JTextField textField1

if ( event.getSource() == textField1 )

string = "textField1: " + event.getActionCommand();


else if ( event.getSource() == textField2 )



else if ( event.getSource() == textField3 )


// user pressed Enter in JTextField passwordField

else if ( event.getSource() == passwordField ) {

string = "passwordField: " +

new String( passwordField.getPassword() );

}

JOptionPane.showMessageDialog( null, string );

} // end method actionPerformed

} // end private inner class TextFieldHandler

} // end class TextFieldTest

// 10. CheckBoxTest.java // Creating JCheckBox buttons.

import java.awt.*;



public class CheckBoxTest extends JFrame {

private JTextField field;

private JCheckBox bold, italic;

// set up GUI

public CheckBoxTest()

{

super( "JCheckBox Test" );





// set up JTextField and set its font

field = new JTextField( "Watch the font style change", 20 );

field.setFont( new Font( "Serif", Font.PLAIN, 14 ) );

container.add( field );

// create checkbox objects

bold = new JCheckBox( "Bold" );

container.add( bold );

italic = new JCheckBox( "Italic" );

container.add( italic );

// register listeners for JCheckBoxes

CheckBoxHandler handler = new CheckBoxHandler();

bold.addItemListener( handler );

italic.addItemListener( handler );

setSize( 275, 100 );

setVisible( true );

} // end CheckBoxText constructor


{

CheckBoxTest application = new CheckBoxTest();


}

// private inner class for ItemListener event handling

private class CheckBoxHandler implements ItemListener {

private int valBold = Font.PLAIN;

private int valItalic = Font.PLAIN;

// respond to checkbox events

public void itemStateChanged( ItemEvent event )

{

// process bold checkbox events

if ( event.getSource() == bold )

valBold = bold.isSelected() ? Font.BOLD : Font.PLAIN;

// process italic checkbox events

if ( event.getSource() == italic )

valItalic = italic.isSelected() ? Font.ITALIC : Font.PLAIN;

// set text field font

field.setFont( new Font( "Serif", valBold + valItalic, 14 ) );

} // end method itemStateChanged

} // end private inner class CheckBoxHandler

} // end class CheckBoxTest


// 11: RadioButtonTest.java // Creating radio buttons using ButtonGroup and JRadioButton.

import java.awt.*;



public class RadioButtonTest extends JFrame {

private JTextField field;

private Font plainFont, boldFont, italicFont, boldItalicFont;

private JRadioButton plainButton, boldButton, italicButton,

boldItalicButton;

private ButtonGroup radioGroup;

// create GUI and fonts

public RadioButtonTest()

{

super( "RadioButton Test" );




// set up JTextField

field = new JTextField( "Watch the font style change", 25 );

container.add( field );

// create radio buttons

plainButton = new JRadioButton( "Plain", true );

container.add( plainButton );

boldButton = new JRadioButton( "Bold", false );

container.add( boldButton );

italicButton = new JRadioButton( "Italic", false );

container.add( italicButton );

boldItalicButton = new JRadioButton( "Bold/Italic", false );

container.add( boldItalicButton );

// create logical relationship between JRadioButtons

radioGroup = new ButtonGroup();

radioGroup.add( plainButton );

radioGroup.add( boldButton );

radioGroup.add( italicButton );

radioGroup.add( boldItalicButton );

// create font objects

plainFont = new Font( "Serif", Font.PLAIN, 14 );

boldFont = new Font( "Serif", Font.BOLD, 14 );

italicFont = new Font( "Serif", Font.ITALIC, 14 );

boldItalicFont = new Font( "Serif", Font.BOLD + Font.ITALIC, 14

);


field.setFont( plainFont ); // set initial font

// register events for JRadioButtons

plainButton.addItemListener( new RadioButtonHandler( plainFont )

);

boldButton.addItemListener( new RadioButtonHandler( boldFont ) );

italicButton.addItemListener(

new RadioButtonHandler( italicFont ) );

boldItalicButton.addItemListener(

new RadioButtonHandler( boldItalicFont ) );

setSize( 300, 100 );

setVisible( true );

} // end RadioButtonTest constructor


{

RadioButtonTest application = new RadioButtonTest();


}

// private inner class to handle radio button events

private class RadioButtonHandler implements ItemListener {

private Font font;

public RadioButtonHandler( Font f )

{

font = f;

}

// handle radio button events


{

field.setFont( font );

}

} // end private inner class RadioButtonHandler

} // end class RadioButtonTest

// 12. ComboBoxTest.java // Using a JComboBox to select an image to display.

import java.awt.*;



public class ComboBoxTest extends JFrame {

private JComboBox imagesComboBox;

private JLabel label;

private String names[] =

{ "bug1.gif", "bug2.gif", "travelbug.gif", "buganim.gif" };

private Icon icons[] = { new ImageIcon( names[ 0 ] ),


new ImageIcon( names[ 1 ] ), new ImageIcon( names[ 2 ] ),

new ImageIcon( names[ 3 ] ) };

// set up GUI

public ComboBoxTest()

{

super( "Testing JComboBox" );




// set up JComboBox and register its event handler

imagesComboBox = new JComboBox( names );

imagesComboBox.setMaximumRowCount( 3 );

imagesComboBox.addItemListener(

new ItemListener() { // anonymous inner class

// handle JComboBox event


{

// determine whether check box selected

if ( event.getStateChange() == ItemEvent.SELECTED )

label.setIcon( icons[

imagesComboBox.getSelectedIndex() ] );

}

} // end anonymous inner class

); // end call to addItemListener

container.add( imagesComboBox );

// set up JLabel to display ImageIcons

label = new JLabel( icons[ 0 ] );

container.add( label );

setSize( 350, 100 );

setVisible( true );

} // end ComboBoxTest constructor


{

ComboBoxTest application = new ComboBoxTest();


}

} // end class ComboBoxTest


// 13. ListTest.java // Selecting colors from a JList.

import java.awt.*;


import javax.swing.event.*;

public class ListTest extends JFrame {

private JList colorList;

private Container container;

private final String colorNames[] = { "Black", "Blue", "Cyan",

"Dark Gray", "Gray", "Green", "Light Gray", "Magenta",

"Orange", "Pink", "Red", "White", "Yellow" };

private final Color colors[] = { Color.BLACK, Color.BLUE,

Color.CYAN,

Color.DARK_GRAY, Color.GRAY, Color.GREEN, Color.LIGHT_GRAY,

Color.MAGENTA, Color.ORANGE, Color.PINK, Color.RED, Color.WHITE,

Color.YELLOW };

// set up GUI

public ListTest()

{

super( "List Test" );


container = getContentPane();


// create a list with items in colorNames array

colorList = new JList( colorNames );

colorList.setVisibleRowCount( 5 );

// do not allow multiple selections

colorList.setSelectionMode( ListSelectionModel.SINGLE_SELECTION

);

// add a JScrollPane containing JList to content pane

container.add( new JScrollPane( colorList ) );

colorList.addListSelectionListener(

new ListSelectionListener() { // anonymous inner class

// handle list selection events

public void valueChanged( ListSelectionEvent event )

{

container.setBackground(

colors[ colorList.getSelectedIndex() ] );

}


); // end call to addListSelectionListener


setSize( 350, 150 );

setVisible( true );

} // end ListTest constructor


{

ListTest application = new ListTest();


}

} // end class ListTest

// 14. BorderLayoutDemo.java // Demonstrating BorderLayout.

import java.awt.*;



public class BorderLayoutDemo extends JFrame implements ActionListener

{

private JButton buttons[];

private final String names[] = { "Hide North", "Hide South",

"Hide East", "Hide West", "Hide Center" };

private BorderLayout layout;

// set up GUI and event handling

public BorderLayoutDemo()

{

super( "BorderLayout Demo" );

layout = new BorderLayout( 5, 5 ); // 5 pixel gaps



container.setLayout( layout );

// instantiate button objects

buttons = new JButton[ names.length ];

for ( int count = 0; count < names.length; count++ ) {

buttons[ count ] = new JButton( names[ count ] );

buttons[ count ].addActionListener( this );

}

// place buttons in BorderLayout; order not important

container.add( buttons[ 0 ], BorderLayout.NORTH );

container.add( buttons[ 1 ], BorderLayout.SOUTH );

container.add( buttons[ 2 ], BorderLayout.EAST );

container.add( buttons[ 3 ], BorderLayout.WEST );

container.add( buttons[ 4 ], BorderLayout.CENTER );

setSize( 300, 200 );


setVisible( true );

} // end constructor BorderLayoutDemo

// handle button events


{

for ( int count = 0; count < buttons.length; count++ )

if ( event.getSource() == buttons[ count ] )

buttons[ count ].setVisible( false );

else

buttons[ count ].setVisible( true );

// re-layout the content pane

layout.layoutContainer( getContentPane() );

}


{

BorderLayoutDemo application = new BorderLayoutDemo();


}

} // end class BorderLayoutDemo

// 15: FlowLayoutDemo.java // Demonstrating FlowLayout alignments.

import java.awt.*;



public class FlowLayoutDemo extends JFrame {

private JButton leftButton, centerButton, rightButton;


private FlowLayout layout;

// set up GUI and register button listeners

public FlowLayoutDemo()

{

super( "FlowLayout Demo" );

layout = new FlowLayout();



container.setLayout( layout );

// set up leftButton and register listener

leftButton = new JButton( "Left" );

container.add( leftButton );

leftButton.addActionListener(


new ActionListener() { // anonymous inner class

// process leftButton event


{

layout.setAlignment( FlowLayout.LEFT );

// realign attached components

layout.layoutContainer( container );

}


); // end call to addActionListener

// 16: GridLayoutDemo.java // Demonstrating GridLayout.

import java.awt.*;



public class GridLayoutDemo extends JFrame implements ActionListener {

private JButton buttons[];

private final String names[] =

{ "one", "two", "three", "four", "five", "six" };

private boolean toggle = true;


private GridLayout grid1, grid2;

// set up GUI

public GridLayoutDemo()

{

super( "GridLayout Demo" );

// set up layouts

grid1 = new GridLayout( 2, 3, 5, 5 );

grid2 = new GridLayout( 3, 2 );



container.setLayout( grid1 );

// create and add buttons

buttons = new JButton[ names.length ];

for ( int count = 0; count < names.length; count++ ) {

buttons[ count ] = new JButton( names[ count ] );

buttons[ count ].addActionListener( this );

container.add( buttons[ count ] );

}

setSize( 300, 150 );


setVisible( true );

} // end constructor GridLayoutDemo

// handle button events by toggling between layouts


{

if ( toggle )


else


toggle = !toggle; // set toggle to opposite value

container.validate();

}


{

GridLayoutDemo application = new GridLayoutDemo();


}

} // end class GridLayoutDemo

//17.JTabbedPaneDemo import javax.swing.*;

/*

<applet code="JTabbedPaneDemo" width=400 height=100>

</applet>

*/

public class JTabbedPaneDemo extends JApplet {

public void init() {

JTabbedPane jtp = new JTabbedPane();

jtp.addTab("Cities", new CitiesPanel());

jtp.addTab("Colors", new ColorsPanel());

jtp.addTab("Flavors", new FlavorsPanel());

getContentPane().add(jtp);

}

}

class CitiesPanel extends JPanel {

public CitiesPanel() {

JButton b1 = new JButton("New York");

add(b1);

JButton b2 = new JButton("London");

add(b2);

JButton b3 = new JButton("Hong Kong");

add(b3);

JButton b4 = new JButton("Tokyo");

add(b4);

}

}


class ColorsPanel extends JPanel {

public ColorsPanel() {

JCheckBox cb1 = new JCheckBox("Red");

add(cb1);

JCheckBox cb2 = new JCheckBox("Green");

add(cb2);

JCheckBox cb3 = new JCheckBox("Blue");

add(cb3);

}

}

class FlavorsPanel extends JPanel {

public FlavorsPanel() {

JComboBox jcb = new JComboBox();

jcb.addItem("Vanilla");

jcb.addItem("Chocolate");

jcb.addItem("Strawberry");

add(jcb);

}

}

//18. JScrollPaneDemo import java.awt.*;


/*

<applet code="JScrollPaneDemo" width=300 height=250>

</applet>

*/

public class JScrollPaneDemo extends JApplet {


// Get content pane

Container contentPane = getContentPane();

contentPane.setLayout(new BorderLayout());

// Add 400 buttons to a panel

JPanel jp = new JPanel();

jp.setLayout(new GridLayout(20, 20));

int b = 0;

for(int i = 0; i < 20; i++) {

for(int j = 0; j < 20; j++) {

jp.add(new JButton("Button " + b));

++b;

}

}


// Add panel to a scroll pane

int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;

int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;

JScrollPane jsp = new JScrollPane(jp, v, h);

// Add scroll pane to the content pane

contentPane.add(jsp, BorderLayout.CENTER);

}

}

//19. JTreeEvents import java.awt.*;



import javax.swing.tree.*;

/*

<applet code="JTreeEvents" width=400 height=200>

</applet>

*/

public class JTreeEvents extends JApplet {

JTree tree;

JTextField jtf;


// Get content pane


// Set layout manager


// Create top node of tree

DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");

// Create subtree of "A"

DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");

top.add(a);

DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");

a.add(a1);

DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");

a.add(a2);

// Create subtree of "B"

DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");

top.add(b);

DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");

b.add(b1);


b.add(b2);



b.add(b3);

// Create tree

tree = new JTree(top);

// Add tree to a scroll pane



JScrollPane jsp = new JScrollPane(tree, v, h);



// Add text field to applet

jtf = new JTextField("", 20);

contentPane.add(jtf, BorderLayout.SOUTH);

// Anonymous inner class to handle mouse clicks

tree.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent me) {

doMouseClicked(me);

}

});

}

void doMouseClicked(MouseEvent me) {

TreePath tp = tree.getPathForLocation(me.getX(), me.getY());

if(tp != null)

jtf.setText(tp.toString());

else

jtf.setText("");

}

}

//20. JTableDemo import java.awt.*;


/*

<applet code="JTableDemo" width=400 height=200>

</applet>

*/

public class JTableDemo extends JApplet {


// Get content pane


// Set layout manager


// Initialize column headings


final String[] colHeads = { "Name", "Phone", "Fax" };

// Initialize data

final Object[][] data = {

{ "Gail", "4567", "8675" },

{ "Ken", "7566", "5555" },

{ "Viviane", "5634", "5887" },

{ "Melanie", "7345", "9222" },

{ "Anne", "1237", "3333" },

{ "John", "5656", "3144" },

{ "Matt", "5672", "2176" },

{ "Claire", "6741", "4244" },

{ "Erwin", "9023", "5159" },

{ "Ellen", "1134", "5332" },

{ "Jennifer", "5689", "1212" },

{ "Ed", "9030", "1313" },

{ "Helen", "6751", "1415" }

};

// Create the table

JTable table = new JTable(data, colHeads);

// Add tree to a scroll pane



JScrollPane jsp = new JScrollPane(table, v, h);



}

}

// 21: EXAMPLE ON JOPTION PANE //Addition.java

// Addition program that displays the sum of two numbers.

// Java packages

import javax.swing.JOptionPane; // program uses JOptionPane

public class Addition {

// main method begins execution of Java application


{

String firstNumber; // first string entered by user

String secondNumber; // second string entered by user

int number1; // first number to add

int number2; // second number to add

int sum; // sum of number1 and number2

// read in first number from user as a string

firstNumber = JOptionPane.showInputDialog( "Enter first integer"

);


// read in second number from user as a string

secondNumber =

JOptionPane.showInputDialog( "Enter second integer" );

// convert numbers from type String to type int

number1 = Integer.parseInt( firstNumber );

number2 = Integer.parseInt( secondNumber );

// TO read number from user as a string

note:- firstNumber = JOptionPane.showInputDialog( "Enter first integer:" );

// add numbers

sum = number1 + number2;

// display result

JOptionPane.showMessageDialog( null, "The sum is " + sum,

"Results", JOptionPane.PLAIN_MESSAGE );

System.exit( 0 ); // terminate application with window

} // end method main

} // end class Addition


SERVLET PROGRAMS


Directory structures of WLAS and Tomcat Web server to store web

applications:

1) Tomcat:

d:\Tomcat 4.1\webapps\ROOT\

*.html

*.jsp

.\WEB-INF\

web.xml (configure servlets)

.\classes\*.class

2)WLAS:

d:\bea\weblogic700\samples\server\stage\examples\examplesWebApp\

*.html

*.jsp

.\WEB-INF\

web.xml

.\classes\

*.class

/*

1: HelloServlet.java

*/

import javax.servlet.*;

import java.io.*;

public class HelloServlet extends GenericServlet

{

public void service(ServletRequest req, ServletResponse resp) throws

ServletException, IOException

{

ServletOutputStream out=resp.getOutputStream();

out.println("Hello response from Hello Servlet");

out.close();

}// service()

}// class

classes> javac HelloServlet.java

WEB-INF>

open web.xml in notepad

<web-app>



<servlet>

<servlet-name>helloServlet</servlet-name>

<servlet-class>HelloServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>helloServlet</servlet-name>

<url-pattern>/helloServlet</url-pattern>

</servlet-mapping>


</web-app>

save & exit

server startup:

d:\Tomcat 4.1\bin\startup.bat

request to servlet:

http://localhost:8080/helloServlet

O/P:

Hello response from Hello Servlet

deployment into WLAS:

1) copy HelloServlet.class

d:\bea\weblogic700\samples\server\stage\examples\examplesWebApp\WEB-

INF\classes\

2) update web.xml

3) start server:

d:\bea\weblogic700\samples\server\config\examples\startExamplesServer.c

md

4) http://localhost:7001/examplesWebApp/helloServlet

// 2 .Http Servlet Example

HTML Prg :-

---------

<html>

<body>

<form action="HttpSer1" method="get">

Name : <input type="text" name="username"/><br>

<input type="submit" value="Get Request"/>

</form><br>

<form action="HttpSer1" method="post">

Name : <input type="text" name="username"/>

<br>

<input type="submit" value="Post Request"/>

</form>

</body>

</html>


import javax.servlet.http.*;

import java.io.*;

public class HttpServletEx1 extends HttpServlet

{

public void doGet(HttpServletRequest req,HttpServletResponse res)throws

ServletException,java.io.IOException

{

String value=req.getParameter("username");

res.setContentType("text/html");


PrintWriter out=res.getWriter();

out.println("Response from doGet<br>");

out.println("Name : "+value);

}//doGet

public void doPost(HttpServletRequest req,HttpServletResponse

res)throws ServletException,java.io.IOException

{

String value=req.getParameter("username");


java.io.PrintWriter out=res.getWriter();

out.println("Response from doPost<br>");

out.println("Name : "+value);

}//doPost

}//class

3.Getting req parameters from HTML

----------------------------------

<html>

<body>

<form action="myapp">

Enter Name : <input type="text" name="username" />

<input type="submit"/>

</form>

</body>

</html>

//Servlet Example to show how to get request parameters


import java.io.*;

public class RequestParamEx1 extends GenericServlet

{

public void service(ServletRequest req,ServletResponse res)throws

ServletException,IOException

{

String username=req.getParameter("username");


out.println("Hello "+username);

}//service


}//class

4.Requesting all html parameters from html(multiple values also)

<HTML>

<HEAD>

<TITLE>A Sample FORM using GET</TITLE>

</HEAD>

<BODY BGCOLOR="#FDF5E6">

<H1 ALIGN="CENTER">A Sample FORM using GET</H1>

<FORM ACTION="./ShowParamSer">

Item Number: <INPUT TYPE="TEXT" NAME="itemNum"><BR>

Quantity: <INPUT TYPE="TEXT" NAME="quantity"><BR>

Price Each: <INPUT TYPE="TEXT" NAME="price" VALUE="$"><BR>

<HR>

First Name: <INPUT TYPE="TEXT" NAME="firstName"><BR>

Last Name: <INPUT TYPE="TEXT" NAME="lastName"><BR>

Middle Initial: <INPUT TYPE="TEXT" NAME="initial"><BR>

Shipping Address:

<TEXTAREA NAME="address" ROWS=3 COLS=40></TEXTAREA><BR>

Credit Card:<BR>

  <INPUT TYPE="RADIO" NAME="cardType"

VALUE="Visa">Visa<BR>


VALUE="Master Card">Master Card<BR>


VALUE="Amex">American Express<BR>


VALUE="Discover">Discover<BR>


VALUE="Java SmartCard">Java SmartCard<BR>

Credit Card Number:

<INPUT TYPE="PASSWORD" NAME="cardNum"><BR>

Repeat Credit Card Number:

<INPUT TYPE="PASSWORD" NAME="cardNum"><BR><BR>

<CENTER>

<INPUT TYPE="SUBMIT" VALUE="Submit Order">

</CENTER>

</FORM>

</BODY>

</HTML>

servlet:-

---------

import java.io.*;



import java.util.*;

public class ShowParameters extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {


response.setContentType("text/html");

PrintWriter out = response.getWriter();

String title = "Reading All Request Parameters";

out.println("<BODY BGCOLOR=\"#FDF5E6\">\n" +

"<H1 ALIGN=CENTER>" + title + "</H1>\n" +

"<TABLE BORDER=1 ALIGN=CENTER>\n" +

"<TR BGCOLOR=\"#FFAD00\">\n" +

"<TH>Parameter Name<TH>Parameter Value(s)");

Enumeration paramNames = request.getParameterNames();

while(paramNames.hasMoreElements()) {

String paramName = (String)paramNames.nextElement();

out.print("<TR><TD>" + paramName + "\n<TD>");

String[] paramValues =

request.getParameterValues(paramName);

if (paramValues.length == 1) {

String paramValue = paramValues[0];

if (paramValue.length() == 0)

out.println("<I>No Value</I>");

else

out.println(paramValue);

} else {

out.println("<UL>");

for(int i=0; i<paramValues.length; i++) {

out.println("<LI>" + paramValues[i]);

}

out.println("</UL>");

}

}

out.println("</TABLE>\n</BODY></HTML>");

}

public void doPost(HttpServletRequest request,



doGet(request, response);

}

}

// 5. program for implementing scopes of servlet var

//Servlet1



import java.io.*;

public class ScopeTestServlet1 extends HttpServlet

{

public void service(HttpServletRequest req,HttpServletResponse

res)throws ServletException,IOException

{

//to maintain request level variable

req.setAttribute("AttName","Request Scope Valiable");


//to maintain session level variables

HttpSession hs=req.getSession();

hs.setAttribute("AttName","Session Scope Variable");

//to maintain context level variable

ServletContext sc=getServletContext();

sc.setAttribute("AttName","Context Scope Variable");



out.println("In ScopeTestServlet1");

RequestDispatcher rd=req.getRequestDispatcher("/STS2");

rd.include(req,res);

out.println("Request Ended");

}//service

}//class

//Servlet2



import java.io.*;

public class ScopeTestServlet2 extends HttpServlet

{



{




out.println("Response From ScopeServlet2<br>");

String req_v=(String)req.getAttribute("AttName");

if (req_v==null)

{

out.println("Request Scope Variable not available<br>");

}//if

else

out.println("Request Variable : "+req_v+"<br>");

String ses_v=(String)hs.getAttribute("AttName");

if (ses_v==null)

out.println("Session Scope Variable is Not available"+"<br>");

else

out.println("Session Variable : "+ses_v+"<br>");

String con_v=(String)getServletContext().getAttribute("AttName");

if (con_v==null)

out.println("Context Scope Variable is not available"+"<br>");

else

out.println("Context Scope Variable : "+con_v+"<br>");


}//service

}//class

6.Program for implementing RequestDispatcher Forward

home.html:-

<html>

<body>

<form action="Servlet1" method="get">

<pre>

First Number : <input type="text" name="first"/>

Second Number : <input type="text" name="second"/>

<input type="submit" value="Add"/>

</pre>

</form>

</body>

</html>

//Servlet1

//To show how to use RequestDispatcher, forward method

import java.io.*;



public class Servlet1 extends HttpServlet

{



{

String s1=req.getParameter("first");

String s2=req.getParameter("second");

try{

Integer.parseInt(s1);


}//try

catch(NumberFormatException e)

{


out.println("In valid numbers");

return;

}//catch

RequestDispatcher

rd=getServletContext().getRequestDispatcher("/AddSer");

if (rd==null)

{


out.println("AddSer not found");

return;


}//if

rd.forward(req,res);

}//doget

}//class

//AddServlet



import java.io.*;

public class AddServlet extends HttpServlet

{



{



int sum=Integer.parseInt(s1)+Integer.parseInt(s2);



out.println("Sum : "+sum);

}//doGet

}//class

7.Program for implementing RequestDispatcher Include

<html>

<body>

<form action="Servlet1" method="get">

<pre>

First Number : <input type="text" name="first"/>

Second Number : <input type="text" name="second"/>

<input type="submit" value="Add"/>

</pre>

</form>

</body>

</html>

//Servlet1

//To show how to use RequestDispatcher, include method


import java.io.*;



public class Servlet1 extends HttpServlet

{



{



try{



}//try

catch(NumberFormatException e)

{


out.println("In valid numbers");

return;

}//catch

/*

RequestDispatcher

rd=getServletContext().getRequestDispatcher("/AddSer");

*/

RequestDispatcher rd=getServletContext().getNamedDispatcher("as");

if (rd==null)

{


out.println("AddSer not found");

return;

}//if

//changes



out.println("<b>Message from Servlet1</b><br>");

out.println("First : "+s1+"<br>");

out.println("Second : "+s2+"<br>");

rd.include(req,res);

out.println("Response Compleated");

}//doget

}//class

//AddServlet




import java.io.*;

public class AddServlet extends HttpServlet

{



{



int sum=Integer.parseInt(s1)+Integer.parseInt(s2);



out.println("Sum : "+sum);

}//doGet

}//class

8.prg to count visitor count



import java.io.*;

public class count extends HttpServlet {

static int c=0;

public void service(HttpServletRequest request,





synchronized(this)

{c++;}

out.println("U r visitor no"+c);

}

9.Reading Initialization parameters from a web.xml

web.xml

-------

<web-app>

<servlet>

<servlet-name>ip</servlet-name>


<servlet-class>InitParameterEx</servlet-class>

<init-param>

<param-name>myparameter</param-name>

<param-value>myvalue</param-value>

</init-param>

</servlet>

<servlet>

<servlet-name>ip1</servlet-name>

<servlet-class>InitParameterEx2

</servlet-class>

<init-param>

<param-name>param1</param-name>

<param-value>value1</param-value>

</init-param>

<init-param>

<param-name>param2</param-name>

<param-value>value2</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>ip1</servlet-name>

<url-pattern>/InitParamEx2</url-pattern>

</servlet-mapping>

//InitParameterEx


import java.io.*;

public class InitParameterEx extends GenericServlet

{

public void init(ServletConfig sc)throws ServletException

{

super.init(sc);

String s=sc.getInitParameter("myparameter");

System.out.println("In init ");

System.out.println("myparameter value is "+s);

}//init



{


out.println("Response from InitParameterEx");


out.println("init parameter

myparameter="+getInitParameter("myparameter"));

}//service

}//class

//Init Parameter


import java.io.*;

public class InitParameterEx2 extends GenericServlet

{

public void init()

{

//this method is called within the init(ServletConfig) method which is

implemented in GenericServlet

java.util.Enumeration enum=getInitParameterNames();

while(enum.hasMoreElements())

{

Object o=enum.nextElement();

String value=getInitParameter((String)o);

System.out.println("Name : "+o+" value : "+value);

}//while

}//init



{

java.util.Enumeration enum=getInitParameterNames();



while (enum.hasMoreElements())

{

String name=(String)enum.nextElement();

String value=getInitParameter(name);

out.println("<b>"+name+"</b>");

out.println("="+value+"<br>");

}//while

}//service

}//class


10.insert data into the databes

html:-

<form action="./Db">

sno<input type="text" name=t1><br>

sname<input type="text" name=t2><br>

age<input type="text" name=t3><br>

<input type=submit name=b1 value=send>

</form>

servlet:-



import java.io.*;

import java.sql.*;

public class Db extends HttpServlet {






String s1=req.getParameter("t1");



class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

try{

Connection

con=DriverManager.getConnection("jdbc:odbc:mydsn","scott","tiger");

String q="insert into student values("+s1+",'"+s2+"',"+s3+")";

Statement st=c.createStatement();

int i=st.executeUpdate(q);

out.println(i+"record posted");

st.close();c.close();

}

catch(Exception e){}

}

}

11.prg to receive uname,pwd from client and validate in db

select the data from the data base



import java.sql.*;

import java.io.*;


public class Db1 extends HttpServlet {






String s1=req.getParameter("uname");

String s2=req.getParameter("pwd");

class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

try{

Connection

con=DriverManager.getConnection("jdbc:odbc:mydsn","scott","tiger");

String q="select count(*) from logintab whwre user='"+s1+"' and

pwd='"+s2"'";

// logintab table contains user , pwd as attributes

Statement st=c.createStatement();

ResultSet rs=st.executeQuery(q);

rs.next();

int i=rs.getInt(1);

if(i>0) out.println("valid user");

else out.println("in valid user");

st.close();c.close();

}


}

}

Application programs using Servlets

1)For reading driver name & url as init parameters to servlet



<HTML>

<BODY>

<FORM action="./counsellingProcessServlet">

<TABLE border="1" align="center">

<TR>

<TH>Name</TH>

<TD><INPUT type="text" name="name" value=""></TD>


</TR>

<TR>

<TH>Address</TH>

<TD><TEXTAREA name="address">No address</TEXTAREA></TD>

</TR>

<TR>

<TH>Course</TH>

<TD>CJ <INPUT type="radio" name="course" value="cj"> AJ <INPUT

type="radio" name="course" value="aj"> J2EE <INPUT type="radio"

name="course" value="j2ee"></TD>

</TR>

<TR>

<TH>Other courses</TH>

<TD><SELECT name="others" MULTIPLE size="5">

<OPTION value="cj">Core Java</OPTION>

<OPTION value="aj">Adv Java</OPTION>

<OPTION value="j2ee">J2EE</OPTION>

</SELECT></TD>

</TR>

<TR>

<TD><INPUT type="submit" name="submit" value="Accept"></TD>

</TR>

</TABLE>

</FORM>

</BODY>

</HTML>

web.xml

--------

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web

Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

<servlet>

<servlet-name>counsellingProcessServlet</servlet-name>

<servlet-class>CounsellingProcessServlet</servlet-class>

<init-param>

<param-name>DRIVER</param-name>

<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>

</init-param>

<init-param>

<param-name>URL</param-name>

<param-value>jdbc:odbc:mydsn</param-value>

</init-param>

<init-param>

<param-name>USER</param-name>

<param-value>scott</param-value>

</init-param>

<init-param>

<param-name>PASS</param-name>

<param-value>tiger</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>counsellingProcessServlet</servlet-name>


<url-pattern>/counsellingProcessServlet</url-pattern>

</servlet-mapping>

</web-app>

// CounsellingProcessServlet.java


import java.io.*;

import java.sql.*;

public class CounsellingProcessServlet extends GenericServlet

{

PrintWriter out;

Connection con;

PreparedStatement pstmt;

int regId;

Statement stmt;

ResultSet rs;

public void init(ServletConfig config) throws ServletException

{

try

{

String driver=config.getInitParameter("DRIVER");

String url=config.getInitParameter("URL");

String user=config.getInitParameter("USER");

String pass=config.getInitParameter("PASS");

Class.forName(driver);

con=DriverManager.getConnection(url, user, pass);

stmt=con.createStatement();

pstmt=con.prepareStatement("insert into counselling

values(?,?,?,?,?)");

}// try

catch(Exception e)

{

e.printStackTrace();

}// catch()

}// init()

public void service(ServletRequest req, ServletResponse resp) throws

ServletException, IOException

{

try

{

out=resp.getWriter();

String name=req.getParameter("name");

String address=req.getParameter("address");

String course=req.getParameter("course");

String others[]=req.getParameterValues("others");

String other="";

for(int i=0;i<others.length;i++)

{

other+=others[i]+"&";

}

rs=stmt.executeQuery("select max(cid) from counselling");


if(rs.next())

{

regId=rs.getInt(1);

}

else

{

regId=0;

}

regId++;

pstmt.setInt(1, regId);

pstmt.setString(2, name);

pstmt.setString(3, address);

pstmt.setString(4, course);

pstmt.setString(5, other);

pstmt.executeUpdate();

out.println("Counselling entry successfully accepted RegID is :

"+regId);

rs.close();

}//try

catch(Exception e)

{


}// catch()

}// service()

public void destroy()

{

try

{

pstmt.close();

stmt.close();

con.close();

}


}// destroy()

}// class

2.Example on Servlet-Servlet communication:

dispatcher\

LoginForm.html

LoginFailed.html

\WEB-INF\web.xml

\classes\

LoginValidatorServlet.java

ViewComposerServlet.java



<HTML>

<BODY>

<FORM action="./loginValidatorServlet" method="POST">

<TABLE border="1" align="center">

<TR>


<TH>User Name</TH>

<TD><INPUT type="text" name="user" value=""></TD></TR>

<TR><TD><INPUT type="password" name="pass" value=""></TD></TR>

<TR><TD><INPUT type="submit" name="submit" value="Login"></TD></TR>

</TABLE>

</FORM>

</BODY>

</HTML>



<CENTER><FONT color="red">Login Failed</FONT></CENTER>

//LoginValidatorServlet.java



import java.io.*;

import weblogic.servlet.security.*;

public class LoginValidatorServlet extends HttpServlet

{

public void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException

{

/*

String user=req.getParameter("user");

String pass=req.getParameter("pass");

*/

ServletAuthentication auth=new ServletAuthentication("user", "pass");

int status=auth.weak(req, resp);

/*

The above function returns AUTHENTICATED if login is successful,

returns FAILED_AUTHENTICATION if login fails

*/

if(status==ServletAuthentication.FAILED_AUTHENTICATION)

{

resp.sendRedirect("./LoginFailed.html");

}

else

{

RequestDispatcher

disp=getServletContext().getNamedDispatcher("viewComposerServlet");

disp.forward(req, resp);

}// else

}// doPost()

}// class

// ViewComposerServlet.java import javax.servlet.*;


import java.io.*;

public class ViewComposerServlet extends HttpServlet

{


public void service(HttpServletRequest req, HttpServletResponse resp)


{

resp.getWriter().println("Login successful");

}// service()

}// class

web.xml

<web-app>

<servlet>

<servlet-name>loginValidatorServlet</servlet-name>

<servlet-class>LoginValidatorServlet</servlet-class>

</servlet>

<servlet>

<servlet-name>viewComposerServlet</servlet-name>

<servlet-class>ViewComposerServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>loginValidatorServlet</servlet-name>

<url-pattern>/loginValidatorServlet</url-pattern>

</servlet-mapping>

<servlet-mapping>

<servlet-name>viewComposerServlet</servlet-name>

<url-pattern>/viewComposerServlet</url-pattern>

</servlet-mapping>

</web-app>

Compilation:

classes> javac *.java

component creation:

cd..

cd..

jar -cvf dispatcher.war *.*

dispatcher>

deployment in WLAS:

d:\bea\weblogic700\samples\server\config\examples\applications\dispatch

er.war

start weblogic server:

cd..

\examples> startExamplesServer.cmd

run:

http://localhost:7001/dispatcher/LoginForm.html

User: weblogic

Pass: weblogic

O/P: Login success


3.Shopping Cart application using sessions & Cookies

<HTML>

<BODY>

<FORM action="./shoppingCartServlet">

<TABLE align="center" border="1">

<TR>

<TH>PRODID</TH>

<TD><INPUT type="text" name="prodId" value=""></TD>

</TR>

<TR>

<TH>QTY</TH>

<TD><INPUT type="text" name="qty" value=""></TD>

</TR>

<TR>

<TD><INPUT type="submit" name="submit" value="Add"></TD>

<TD><INPUT type="submit" name="submit" value="Remove"></TD>

<TD><INPUT type="submit" name="submit" value="List"></TD>

</TR>

</TABLE>

</FORM>

</BODY>

</HTML>

// ShoppingCartServlet.java import javax.servlet.*;


import java.io.*;

import java.util.*;

public class ShoppingCartServlet extends HttpServlet

{



{

// sending MIME type to client

resp.setContentType("text/html");

PrintWriter out=resp.getWriter();

HttpSession session=req.getSession();

String submit=req.getParameter("submit");

String prodId=req.getParameter("prodId");

String qty=req.getParameter("qty");

if(submit.equals("Add"))

{

session.setAttribute(prodId, qty);

out.println("Item added to cart");

}

else if(submit.equals("Remove"))

{

session.removeAttribute(prodId);

out.println("Item removed from cart");

}


else

{

Enumeration enum=session.getAttributeNames();

out.println("<TABLE border='10'>");

while(enum.hasMoreElements())

{

String key=enum.nextElement().toString();

String value=session.getAttribute(key).toString();

out.println("<TR><TD>"+key+"</TD><TD>"+value+"</TD></TR>");

}// while()

out.println("</TABLE>");

}// else

out.println("Thanks for visiting");

out.close();

}// service()

}// class

//Shopping Cart application Using Cookies

<HTML>

<BODY>

<FORM action="./CShoppingCartServlet">

<TABLE align="center" border="1">

<TR>

<TH>PRODID</TH>

<TD><INPUT type="text" name="prodId" value=""></TD>

</TR>

<TR>

<TH>QTY</TH>

<TD><INPUT type="text" name="qty" value=""></TD>

</TR>

<TR>

<TD><INPUT type="submit" name="submit" value="Add"></TD>

<TD><INPUT type="submit" name="submit" value="Remove"></TD>

<TD><INPUT type="submit" name="submit" value="List"></TD>

</TR>

</TABLE>

</FORM>

</BODY>

</HTML>

//CshoppingCartServlet.java



import java.io.*;

public class CShoppingCartServlet extends HttpServlet

{



{

PrintWriter out=resp.getWriter();


String prodId=req.getParameter("prodId");

String qty=req.getParameter("qty");

String submit=req.getParameter("submit");

if(submit.equals("Add"))

{

Cookie ck=new Cookie(prodId, qty);

resp.addCookie(ck);

out.println("Item added");

}

else

if(submit.equals("Remove"))

{

Cookie ck=new Cookie(prodId, null);

ck.setMaxAge(0);

resp.addCookie(ck);

out.println("Item deleted");

}

else

{

Cookie ck[]=req.getCookies();

out.println("<TABLE border='10' align='center'>");

for(int i=0;i<ck.length;i++)

{

out.println("<TR>");

out.println("<TD>"+ck[i].getName()+"</TD>");

out.println("<TD>"+ck[i].getValue()+"</TD>");

out.println("</TR>");

}// for()

out.println("</TABLE>");

}// else

out.close();

}// service()

}// class

// 4.Program with URL rewriting <html>

<body>

<form action="UR1">

User Name : <input type="text" name="uname">

<input type="submit">

</form>

</body>

</html>

web.xml

--------

<?xml version="1.0"?>

<!DOCTYPE web-app

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>


<servlet>

<servlet-name>ls1</servlet-name>

<servlet-class>URLRewritingEx1</servlet-class>

</servlet>

<servlet>


<servlet-class>URLRewritingEx2</servlet-class>

</servlet>

<servlet-mapping>


<url-pattern>/UR1</url-pattern>

</servlet-mapping>

<servlet-mapping>


<url-pattern>/UR2</url-pattern>

</servlet-mapping>

</web-app>

//URL Rewriting – Servlet Program


import java.io.*;

public class URLRewritingEx1 extends GenericServlet

{



{

String uname=req.getParameter("uname");



out.println("<a

href=\"http://localhost:8080/urlrewriting/UR2?uname="+uname+"\"> Next

Request </a>");

}//service

}//class

//URL Rewriting Ex2


import java.io.*;

public class URLRewritingEx2 extends GenericServlet

{




{

String s=req.getParameter("uname");



out.println("User Name : "+s);

}//service

}//class

//5.Validating Uname & Pword using servlet-beans .

<html>

<body>

<form action="sessionex1">

<pre>

User Name : <input type="text" name="UserName">

Password : <input type="password" name="pass">

<input type="submit">

</pre>

</form>

</body>

</html>

web.xml

-------

<web-app>

<servlet>

<servlet-name>hs1</servlet-name>

<servlet-class>

myexamples.HttpSessionEx1

</servlet-class>

</servlet>

<servlet>


<servlet-class>

myexamples.HttpSessionEx2

</servlet-class>

</servlet>

<servlet-mapping>


<url-pattern>/sessionex1</url-pattern>

</servlet-mapping>

<servlet-mapping>



<url-pattern>/sessionex2</url-pattern>

</servlet-mapping>

</web-app>

// HttpSession Example



import java.io.*;

public class HttpSessionEx1 extends HttpServlet

{



{


System.out.println("Session is new "+hs.isNew());

String s=req.getParameter("UserName");

String s1=req.getParameter("pass");

ValidationBean vb=new ValidationBean();

if (vb.validate(s,s1))

{

hs.putValue("UserName",s);

//or

//hs.setAttribute("UserName",s);



out.println("<a href=\"http://localhost:8080/session/sessionex2\">");

out.println("Next Request</a>");

}//if

}//service

}//class

//HttpSessionEx2.java

package myexamples;



import java.io.*;

public class HttpSessionEx2 extends HttpServlet


{



{

HttpSession hs=req.getSession(false);



if (hs==null)

{

out.println("In Valid Request");

out.println("<br><a

href=\"http://localhost:8080/session/sessionex1\">");

out.println("Home</a>");

}//if

else

{

out.println("UserName : "+hs.getValue("UserName"));

//or

//hs.getAttribute("UserName");

}//else

}//service

}//class

//Validation Bean

package myexamples;

import java.sql.*;

public class ValidationBean

{

public ValidationBean(){}

public boolean validate(String name,String pass)

{

Connection con=null;

Statement st=null;

ResultSet rs=null;

try{

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:serve

r","scott","tiger");


st=con.createStatement();

rs=st.executeQuery("select * from user_tab where name=\'"+name+"\' and

pass=\'"+pass+"\'");

if (rs.next())

{

return true;

}//if

}//try

catch(SQLException e)

{e.printStackTrace();}

finally{

try{rs.close();st.close();con.close();}

catch(SQLException e)

{e.printStackTrace();}

}//finally

return false;

}//validate

}//class


JSP


JSP Features & Syntax

Scripting Elements

Scripting elements allow Java code to be written directly into the JSP page. It is

compiled and available within the page. There are three kinds of scripting elements:

declarations

expressions

scriplets

1.Declarations

Declarations are used to define variables and methods -- both instance and static -- that

are likely to be repeated. Thus, they correspond to writing code at the Java Class

level. They can also be used to overwrite jspInit or jspDestroy methods that are

created when the JSP is compiled.

The basic form is:

<%! Java variable or method %>

Example:

<%! String message; %>

or

<% String message = "Hello, World, from JSP"; %>

2. Expressions

Expressions are references to variables, methods, or composable structures of such.

They are most often used as a way of dynamically inserting a value into a parameter

slot. You may also think of them as representing a call to a static method. They are

evaluated at run time and the results inserted into the output stream at the location of

the expression.

The basic form is:

<%= Java expression %>

Example:


<h2><font color="#AA0000"><%= message%></font></h2>

Note that expressions do not include a semicolon(;).

3. Scriplets

Scriplets are sections of Java code that are executed in place. They can be as simple

as a declaration of a variable that is treated as an instance variable, but they can also

include loops that mix Java and HTML.

The basic form is:

<% Java code %>

Example:

<% if ( sessionBean.getLoginType() == 0 ) { %>

<p align="center"><B>Super User</B></p>

<%} else if ( sessionBean.getLoginType() == 1 ) {%>

<p align="center"><B>Administrative User</B></p>

<%} else if ( sessionBean.getLoginType() == 2 ) {%>

<p align="center"><B>Author User</B></p>

<%} else {%>

<p align="center"><B>Registered User</B></p>

<%} %>

Implicit Objects

Several local variables are available to scriptlets and expressions through the

ServletContext. They include the following:

application

config

session

request

response


out

page

pageContext

exception

Most are self-explanatory. Application, which is the ServletContext of the JSP and

stores attributes for the duration of the application.. Page is the current jsp page and

stores attributes associated wit the current page. Out is a writer that can be used by

scriptlets to put information onto the output stream.

Directives

Directives are instructions to the JSP compiler. The three types of directives are:

page

include

taglib

Only the include directive will be discussed here.

The include directive instructs the JSP compiler to fetch the file referenced in the

directive and insert it into the page at that point. Thus, it can be used to include

standard boilerplate, such as headers and footers.

The basic form is:

<%@ directive %>

Example:

<%@ include file="header.html" %>

If the included file is HTML, it should not repeat any HTML HEAD or BODY tags

that may already be defined in the output stream.

Actions

Actions are JSP tags that transfer control to other server objects or perform operations

on other objects. They may also generate output. They are another means of building

view objects within a M - V - C architecture. There are some half-dozen action tags.

The three that will be discussed here are:

include

forward

useBean


All are marked by tags that have the following form:

<jsp:action attributes />

Include

The include tag is very similar to the include directive, discussed above. It allows

content to be included in place. The content may be either static or dynamic.

Here is an example:

<jsp:include page="header.html" flush="true"/>

Forward

The forward tag transfer control to a static or dynamic resource, usually referenced by

a URL, that exists on the same server.

The basic form is:

<jsp:forward page="forward_page.html"/>

Example:

<jsp:forward page="forward_page.html" flush="true"/>

UseBean

The useBean action is by far the most powerful and the most complex of the JSP

actions. It allows a JSP to create an instance or receive an instance of a Java Bean.

The JSP could provide typical servlet controller functions by passing the request

object to the bean and allowing it to extract user parameters and call back-end

functions, just like a servlet. However, supporting those functions in a servlet is

generally considered a better practice. However, rather than transferring result values

to another type, such as a Hashtable, and passing that object to a JSP, if a back-end

process returned a result bean back to a controller servlet, it could simply pass this

bean to the relevant JSP.

In fact, so long as the Java server supports it and is properly configured, it permits

beans to be passed from servlet to JSP, to another JSP, to another servlet, etc. This is

called chaining and is an architecture used to provide incrementally processing using

filtering principles.


JSP Page Scopes

All jsp objects exist within a particular scope or context. There are four jsp scopes:

page

request

session

application

Request and session should be familiar. Page is the current jsp page. Application is

the current overall application and can include multiple sessions. Thus, all users

sharing a given application, who may be associated with different sessions, would

have access to the same set of application-scope resources.

programs

1.HelloWorld.jsp

------------------------ <HTML>

<HEAD>

<TITLE>Hello Program </TITLE>

</HEAD>

<body>

<h1>Hello World message from Ganapathi Raju</h1>



<%out.println("Hello World");%>

</body>

<html>

2. a.jsp

-----------

<body>

<% @ page language="Java" %>

<% out.println("hello world");%>

</body>

Note: example of Declarations of var:-

---------------------------------------------- <%! int a; %> <%! int a=50; %>

<%! int a=50,b=100; %>

<%! int a=75;String s="Ganesh"; %>

<%! int a=50;float f=10.2f;%>


4.decl.jsp

--------

<HTML>

<HEAD>

<TITLE>JSP Declarations</TITLE>

</HEAD>

<BODY>

<H1>JSP Declarations</H1>

<%! private int accessCount = 0; %>

<H2>Accesses to page since server reboot:

<%= ++accessCount %></H2>

</BODY>

</HTML>

5.Loop.jsp

-------------

<body>

<% for (int i=0;i<5;i++){%>

<b>Hello</b><br> <%}%>

</body>

(or)

<body>

<% for (int i=0;i<5;i++){

out.println("<b>Hello</b><br>");

}%>

</body>

6.Expr1.jsp

-------------

<body>

<h1>Data in various sizes</h1>

<for(int i=1;i<7;i++){%>

<font size=<%=i%>>Hello in size<%=i%>

</font>

<br>

<%}%>

</body>

7.Expr2.jsp

----------------- <% String c[]={"red","green","blue","yellow"};%>

<% for(int i=0;i<c.length;i++){%>

<font size=<%=i+1%>Color=<%=c[i]%>>Hello</font>

<br>

<%}%>


// program with page directive

8.Excel.jsp

--------

<%@ page contentType="application/vnd.ms-excel" %>

<%-- Note that there are tabs, not spaces, between columns. --%>

1997 1998 1999 2000 2001 (Anticipated)

12.3 13.4 14.5 15.6 16.7

9.Ex.html

----------

<body>

here specify the format either "excel" or "html"

<form name="f1" action="ApplesAndOranges.jsp">

<br><input type="text" name="format" ><br>

<input type="submit"> </body>

Ex.jsp

----------- <HTML>

<HEAD>

<TITLE>Comparing Apples and Oranges</TITLE>

</HEAD>

<BODY>

<CENTER>

<H2>Comparing Apples and Oranges</H2>

<%

String format = request.getParameter("format");

if ((format != null) && (format.equals("excel"))) {

response.setContentType("application/vnd.ms-excel");

}

%>

<TABLE BORDER=1>

<TR><TH></TH><TH>Apples<TH>Oranges

<TR><TH>First Quarter<TD>2307<TD>4706

<TR><TH>Second Quarter<TD>2982<TD>5104

<TR><TH>Third Quarter<TD>3011<TD>5220

<TR><TH>Fourth Quarter<TD>3055<TD>5287

</TABLE>

</CENTER>

</BODY>

</HTML>


//Program with Method Declaration and call

10 met.jsp

------------

<body>

<%! public int mysum(int a,int b) {

return a+b;

}

%>

<%out.println("<h1>sample method invocation</h1>");

int a=mysum(10,20);

out.println("data is "+a);%><br><b>

<%out.println(" sum is "+mysum(100,300);%>

</b>

</body>

// HTML TO JSP INTERACTION.

11. page1.html

---------

<body>

<form action="rec.jsp">

Name:-<input type="text" name="t1"><br>

<input type="submit" name=b1 value="send">

</form>

</body>

rec.jsp

-----------

<body>

<h1>JSP TO RECEIVE DATA FROM HTML</h1>

<% String s1=request.getParameter("t1";%>

<% if(s1.equal(""))

response.sendRedirect("error.jsp");%>

<b> Data received is <%=s1%>from html</b>

</body>

// 12.JSP to Database Connectity

-------------------------------------------------

a) JSP PROGRAM to insert data into the data base using method:-

Html prg:-

<html>

<head>

<title> Insert data into the database </title>

</head>

<body bgcolor="grey" background="a.jpg">

<form name="f1" action="r.jsp">


<div align="center">

<h2>Inserting Data into the data base</h2><hr>

<table border=0 >

<tr><td>No:- <input type="text" name="t1"></td>

<tr><td>Name:- <input type="text" name="t2"></td>

<tr> <td><input type="submit" value="insert"><td></tr>

</div>

</form>

</body>

</html>

JSP prg:-

<body background="a.jpg">

<%@ page language="java" contentType="text/html" %>

<%@ page import ="java.sql.*" %>

<%! public int insertRec (String a,String b)

{

try

{


Connection c = DriverManager.getConnection("jdbc:odbc:mydsn1");

Statement st = c.createStatement();

int i = st.executeUpdate("insert into e values("+a+",'"+b+"')");

st.close();

c.close();

return i;

}

catch(Exception e)

{

System.out.println("exception "+e);

return 0;

}

} %>

<% String s1 = request.getParameter("t1");

String s2=request.getParameter("t2");

int i = insertRec(s1,s2);

out.println(i+"record(s) posted to the database"); %>

</body>

12 b) JSP PROGRAM TO SELECT DATA FROM DATABASE

HTML PRG:-


<html>

<head>

<title> Read data from data base </title>

</head>

<body bgcolor="grey" background="a.jpg">

<form name="f2" action="r1.jsp">

<div align="center">

<h2>getting data from database</h2><hr>

<table border=0 >

<tr> <td><input type="submit" value="select"><td></tr>

</div>

</form>

</body>

</html>

JSP PRG:-

<html>

<head><title >Table values are</title>

</head>

<body background="a.jpg">

<%@ page language="java" contentType="text/html" %>

<%@ page import ="java.sql.*" %>

<h1><center> Tables values are</h1>

<hr>

<table border="2" cellspacing="10" cellpadding="10">

<tr><th>Eno</th><th>Ename</th></tr>

<%

{

try

{


Connection c = DriverManager.getConnection("jdbc:odbc:mydsn1");

Statement st = c.createStatement();

ResultSet rs=st.executeQuery("select eno,ename from e");

while(rs.next())

{

System.out.println("1");

%>

<tr><td>

<%=rs.getString("eno")%></td>

<td><%=rs.getString("ename")%><br></td></tr>

<%

}

st.close();


c.close();

}

catch(Exception e)

{

System.out.println("exception "+e);

}

} %>

</center>

</table>

</body>

<%--

13. Example on JSP design pattern: Composite View

used elements are:

include directive & jsp:include

--%>



<HTML>

<BODY>

<TABLE>

<TR>

<TD width="20%"><IMG src="IBM-logo.jpg"/></TD>

<TD>Home|AppServer|Examples|About Us</TD>

</TR>



<OL>

<LI>Home</LI>

<LI>AppServer</LI>

<LI>Examples</LI>

<LI>About Us</LI>

</OL>



<P><CENTER>Sample text placed in body content area</CENTER></P>



<TR><TD>

<CENTER>Griet</CENTER>

</TD></TR></TABLE></BODY></HTML>



<%@ include file="Header.html"%>

<TR>

<TD width="20%"><%@ include file="Menu.html"%></TD>

<TD><%@ include file="BodyContent.html"%></TD>

</TR> <jsp:include page="Footer.html"/>

JSP Programs with Beans

--------------------------------

// 14. program shows how to use beans with JSP

//This application combines seperates control layers and presentation layers of MVC.

/*

Example on jsp:useBean

*/

jsp\

EmpQuery.jsp

\WEB-INF\classes\beans\ EmpBean.java



<FORM action="./EmpQuery.jsp">

Empno <INPUT type="text" name="empno" value="">

<INPUT type="submit" name="submit" value="Submit"> </FORM>



<jsp:useBean id="emp" class="beans.EmpBean">

<jsp:setProperty name="emp" property="empno" value="<%=Integer.parseInt(request.getParameter(\"empno\").trim())%>"/>

<jsp:getProperty name="emp" property="ename"/><BR>

<jsp:getProperty name="emp" property="job"/><BR> <jsp:getProperty name="emp" property="sal"/><BR>

</jsp:useBean>

// EmpBean.java

import java.io.*;

public class EmpBean implements Serializable

{ private int empno;

private String ename, job;


private double sal;

public EmpBean() {}

/*

public void setEmpno(int empno)

{ this.empno=empno;

}

*/ public void setEname(String ename)

{

this.ename=ename; }

public void setJob(String job)

{

this.job=job; }

public void setSal(double sal)

{ this.sal=sal;

}

public int getEmpno() {

return empno;

}

public String getEname() {

return ename;

} public String getJob()

{

return job;

} public double getSal()

{

return sal; }

public void setEmpno(int empno)

{ this.empno=empno;

try

{


java.sql.Connection con=java.sql.DriverManager.getConnection("jdbc:odbc:mydsn", "scott",

"tiger");

java.sql.Statement stmt=con.createStatement();

java.sql.ResultSet rs=stmt.executeQuery("select empno, ename, job, sal from emp where

empno="+empno);


if(rs.next()) {

this.ename=rs.getString(2);

this.job=rs.getString(3);

this.sal=rs.getDouble(4); }// if()

rs.close();

stmt.close(); con.close();

}// try

catch(Exception e) {


}// catch()

}// setEmpno() }// class





<FORM action="./EmpQuery1.jsp">

Empno <INPUT type="text" name="empno" value=""> <INPUT type="submit" name="submit" value="Submit">

</FORM>



<jsp:useBean id="emp" class="beans.EmpBean" scope="session">

<jsp:setProperty name="emp" property="empno"

value='<%=Integer.parseInt(request.getParameter("empno").trim())%>'/>

<jsp:forward page="EmpResult1.jsp"/> </jsp:useBean>



<% beans.EmpBean

emp=(beans.EmpBean)pageContext.getAttribute("emp",pageContext.SESSION_SCOPE);

%> <TABLE border="1" align="center">

<TR> <TH>EMPNO</TH>

<TH>ENAME</TH>

<TH>SAL</TH>

<TH>JOB</TH>


</TR>

<TR>

<TD><%=emp.getEmpno()%></TD> <TD><%=emp.getEname()%></TD>

<TD><%=emp.getSal()%></TD>

<TD><%=emp.getJob()%></TD> </TR>

</TABLE>

// EmpBean.java

import java.io.*;

public class EmpBean implements Serializable

{ private int empno;

private String ename, job;

private double sal; public EmpBean()

{}

/* public void setEmpno(int empno)

{

this.empno=empno;

} */

public void setEname(String ename)

{ this.ename=ename;

}

public void setJob(String job)

{ this.job=job;

}

public void setSal(double sal) {

this.sal=sal;

} public int getEmpno()

{

return empno;

} public String getEname()

{

return ename; }

public String getJob()

{ return job;

}

public double getSal()

{


return sal;

} public void setEmpno(int empno)

{

this.empno=empno;

try {


java.sql.Connection con=java.sql.DriverManager.getConnection("jdbc:odbc:mydsn", "scott",

"tiger");

java.sql.Statement stmt=con.createStatement();

java.sql.ResultSet rs=stmt.executeQuery("select empno, ename, job, sal from emp where

empno="+empno);

if(rs.next())

{ this.ename=rs.getString(2);

this.job=rs.getString(3);

this.sal=rs.getDouble(4); }// if()

rs.close();

stmt.close();

con.close(); }// try

catch(Exception e)

{ e.printStackTrace();

}// catch()

}// setEmpno()

}// class

16. Program to implement strict MVC architecture . MVC:

View: Presentation logic

Business logic: validates user I/P data with all required conditions

Control: which controls flow of execution between MVB

Model: access DB

Note1: In MVC arch business logic and control layers are combined into one layer

Note2: In classic MVC Model 2 arch business logic seperated from control control

Preferable way of utilizing web components in MVC & MVC 2: JSP/HTML - View

Servlets - Control

JavaBeans - Business logic & model

jsp\

EmpQuery.html


EmpResult.jsp

\WEB-INF\web.xml .\classes\EmpQueryServlet

.\beans\EmpBean.java



<FORM action="./empQueryServlet">

Empno <INPUT type="text" name="empno" value="">

<INPUT type="submit" name="submit" value="Submit"> </FORM>



<% beans.EmpBean bean=(beans.EmpBean)session.getAttribute("emp");

%>

<TABLE border="20" align="center"> <TR>

<TD><%=bean.getEmpno()%></TD>

<TD><%=bean.getEname()%></TD> <TD><%=bean.getSal()%></TD>

<TD><%=bean.getJob()%></TD>

</TR>

</TABLE>

// EmpQueryServlet.java


import javax.servlet.http.*; import java.io.*;

import beans.*;

public class EmpQueryServlet extends HttpServlet

{ public void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException,

IOException

{ int empno=Integer.parseInt(req.getParameter("empno").trim());

EmpBean bean=new EmpBean();

bean.setEmpno(empno);

req.getSession().setAttribute("emp", bean);

getServletContext().getRequestDispatcher("/EmpResult.jsp").forward(req,resp);

}// service()

}// class

web.xml

---------


<web-app>

<servlet> <servlet-name>empQueryServlet</servlet-name>

<servlet-class>EmpQueryServlet</servlet-class>

</servlet>

<servlet-mapping> <servlet-name>empQueryServlet</servlet-name>

<url-pattern>/empQueryServlet</url-pattern>

</servlet-mapping> </web-app>

END

Documents

Web Technologies Manual