Core basic Java web server technologies. Tools Eclipse IDE for Java EE Developers (Netbeans also...

Core basic Java web server technologies

Tools• Eclipse IDE for Java EE

Developers (Netbeans also works)

http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/keplersr2

• Application server (e.g.

Tomcat, GlassFish)https://tomcat.apache.org/download-80.cgi#8.0.28

Create a dynamic web project

JSPs (Java Servlet Pages)• JSPs are one of the core building blocks of Java web applications,

allowing us to combine HTML and Java seamlessly• JSP lifecycle: http://www.tutorialspoint.com/jsp/jsp_life_cycle.htm • We can embed Java code into JSP with scriptlet tags

<%java.util.Date today = new java.util.Date();String mess = "Today is "+today;

%><%= mess %>Or<%

java.util.Date today = new java.util.Date();String mess = "Today is "+today;out.println(mess);

%>Output

Press CTRL+Space

Scriplets

For deployment

Steps for deployment on your local computer

• Right-click on the project->Export->WAR• Copy the war file into webapps folder from your Tomcat installation folder• Close the Tomcat fromEclipse and open it from Startup • You should be able to seethe results when calling yourweb application from localhost• You can deploy your web application for free on

https://www.openshift.com , Google App Engine, etc by uploading your war

How to import Java classes into JSPs

How to retrieve parameters from the URL in JSPs

Java Servlet• A servlet is a Java class that runs in an "application server" and sends

web pages back to a browser when a user somewhere in the world clicks on a URL.

To get some URL parameters…

Work with scriplets and HTML

The include directive vs the include jsp tag

• Static include includes smth into the page, before compiling and sending it to the browser (directive)• Dynamic include takes place at runtime (jsp tag)

Going from jsp page/servlet to another jsp page/servlet

• In forward, you see the content of your forwarded page, but the url of the initial page.• In redirect, you see for a second the content of your initial page, then you see your redirected page and, also,

its url.

Declaration tag

Summary of JSP tags so far…