ServletServletjavaWEBServletWEB

ServletServletJSPServletServletServletJSPServlet

9.1 Servlet?ServletServlet APIjavaServlet9-19-1 Servlet

HTTPServlerServletServletServlet(service())ServletHTTPServlet

9.2 ServletJSP ServletJSPJSPServletJSPServletJSPServletJSPServlet

9.3 Servlet ServletServletWEBServletweb.xml

9.3.1Servletservletservlet e:\test\9

servletservletinit()service(),e:\test\9Ex9_1.java

servlet API Ex9_1.javaservlet APIservlet-api.jarE:\Tomcat 5.0\common\libe:\test\9

servlet dose:\test\9Ex9_1.javadosjavac classpath servlet-api.jar Ex9_1.java Ex9_1.class

9.3.2Servlet1servlet Tomcat 5.0servletROOT\WEB-INF\classesEx9_1.class web.xmlweb.xmlROOT\WEB-INF

name_1 //servlet Ex9_1 //servlet

name_1 //servlet /doget1 //servlet()

web.xml

9.3.3 Servlet web.xmlTomcat5.0 http://localhost:8090/doget1 servlet9-2 9-2 servlet

9.4 Servlet ServletServlet APIServlet APIjavax.servletjavax.servlet.httpjavax.servlethttpjavax.servlet.httphttpjavax.servletServletGenericServletHttpServlet

1 GenericServlet GenericServletjavax.servletservletinit()destroy()service()service()

2 HttpServlet HttpServletjavax.servlet.httpGenericServletHttpServletservice()doXXX

(1) service()public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { ,requestresponse HttpServletRequest/ HttpServletResponseservice() }

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpServletRequest/ HttpServletResponsehttp6doXXX() }

(2) doXXX() doXXX()6 doGet(), doPost(),doDelete(),doPut(),doTrace(),doOption()Formmethodget2kB, postdoGet()doPost() protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ doPost()}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ doGet()} ServletHttpServletservice()doPost()doGet()

3.ServletServler (1).HttpServlet(2).HttpServletservice()doPost()doGet()Servletservice()doPost()doGet()servlet

9.4.1 [9.2] ex9_2.jspServlet(Ex9_2.java)9-39-3 servlet

ex9_2.jsp: Ex9_2.java: 1Ex9_2HttpServlet 2doPost() 3 4out 5GB2312 6name/love 7(name)(love)

9.4.2[9.3] Servlet[8.3]ReadFile.javaServletReadFile.java

ex9_3.jspServlet(ReadFileServlet.java)java(ReadFile.java)Ex9_3.jspServletServletReadFile.java9-49-4 servlet

ex9_3.jsp: ReadFileServlet.java 1ReadFileServletHttpServlet 2doPost()() 3 4out 5(filePath)(fileName) 6(filePath)(fileName)readFileBean 7getReadContent()readContent 8readContent

:web.xmlServlet(ReadFileServlet.java) /doget3 ex9_3.jsp /doget3 Servlet

ReadFileServlet.javaReadFile.java importReadFileServletROOT\WEB-INF\classes\ch9web.xmlServlet /doget3

9.5 ServletServletServletServletServlet

1Servlet(1) init() servletservletservlet

(2) service() servletservice()/(doXXX()),servlet(3) destroy() servlet(), servletservlet

2Servlet servletservlet?

?

9-5 servlet

9.5.1 init()Servlet[9.4](students)ServletJSPServletJSPServletServlet

ex9_4.jspEx9_4.java(Servlet)Ex9_4.javaex9_4.jspEx9_4.java9-69-6 servlet

Servlet(Ex9_4.java)init()init()public void init(ServletConfig config) throws ServletException { super.init(config); try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");// } catch(ClassNotFoundException e) { } try{ con=DriverManager.getConnection("jdbc:odbc:grade","",""); } catch(SQLException e) { } }

init()Servletcon

9.5.2 service() [9.4] Ex9_4.java()service()Servlet(Ex9_4.java)service()

service():

service()()service()

9.5.3 destroy()Servlet9.4Servlet(Ex9_4.java)destroy()ServletServlet(Ex9_4.java)Servletdestroy()

destroy(): public void destroy() { super.destroy(); try { con.close(); } catch(Exception e) { e.printStackTrace(); } } destroy():destroy()Servelt

web.xmlServlet(Ex9_4.java) " /doget4 "ex9_4.jsp" /doget4 "Servlet(Ex9_4.java)ex9_4.jsp

9.6 jspServlet[9.5]//"e:\phone.txt"JSP////ServletServlet"e:\phone.txt"ex9_5.jspServlet(Ex9_5.java)Servlet(Ex9_5.java)"e:\phone.txt"

ex9_5.jsp:(name),(sex)(telphone) Ex9_5.java: 1HttpServletEx9_5 2ou(), outbuff() 3init()ououtbuff 4doPost()"text/html;charset=GB2312" 5out 6"GB2312" 7name/sex/telphone 8(name),(sex),(telphone) outbuff 9(name),(sex),(telphone)

ServletJSPServletServletServletServlet

1ServletJSPJSPJavaHTMLServlet2Servlet.classWeb.xmlServletTomcatBean3ServletServlet APIjavac classpath servlet-api.jar 4doGetdoPostservicedoGetdoPostFormgetpostdoGetservicedoGetdoPost

5doPutdeletedoPutdeletejava6PrintWriterJSPoutHTML7HttpServletRequestHttpServletResponseJSPrequestresponse

Ex9_1.javaimport java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class Ex9_1 extends HttpServlet{ public void init(ServletConfig config) throws ServletException { super.init(config); } public void service(HttpServletRequest reqest, HttpServletResponse response) throws IOException { response.setContentType("text/html;charset=GB2312"); // PrintWriter out=response.getWriter(); out.println(""); out.println(" "); out.println(""); }}

ex9_2.jsp:

: : Sleep Dance Travel

Ex9_2.java:import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class Ex9_2 extends HttpServlet{ //doPost public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException,IOException { res.setContentType("text/html;charset=GB2312");// PrintWriter out=res.getWriter(); // req.setCharacterEncoding("GB2312"); String name=(String)req.getParameter("myname") ; String love=(String)req.getParameter("love") ; out.println(" "); out.println(":" + name);//"myname" out.println(""); out.println(":" + love);//"love" out.println(""); out.close(); }}