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 import java.util.*;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;


public class MyServlet extends HttpServlet
{

   
  public void doGet(HttpServletRequest req, HttpServletResponse res)

                               throws ServletException, IOException 
{

    res.setContentType("text/html");

    PrintWriter out = res.getWriter();


    // Get the current session object, create one if necessary

    HttpSession session = req.getSession();


    out.println("<HTML><HEAD><TITLE>SessionTimer</TITLE></HEAD>");

    out.println("<BODY><H1>Session Timer<</H1>");


    // Display the previous timeout

    out.println("The previous timeout was " +

                session.getMaxInactiveInterval());

    out.println("<BR>");


    // Set the new timeout

    session.setMaxInactiveInterval(2*60*60);  // two hours


    // Display the new timeout

    out.println("The newly assigned timeout is " +
                session.getMaxInactiveInterval());


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

  }

}

//xml code



<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">


<web-app>

    <servlet><servlet-name>MyServletName</servlet-name>

             <servlet-class>MyServlet</servlet-class>


             
    </servlet>

    
    <servlet-mapping><servlet-name>MyServletName</servlet-name>

        <url-pattern>/index.html</url-pattern>

    </servlet-mapping>

</web-app>

build .xml
<project name="MyProject" default="compile" basedir=".">

 
    <property name="sourcedir" value="${basedir}/src"/> 

    <property name="webdir" value="${basedir}/build"/>
    <property name="javaSourcedir" value="${sourcedir}/WEB-INF/classes"/>

    <property name="webClassdir" value="${webdir}/WEB-INF/classes"/>

    <property name="webClassLib" value="${webdir}/WEB-INF/lib"/>

    <property name="compileLibDir" value="${basedir}/lib"/>


    <path id="libraries">

        <fileset dir="${compileLibDir}">

            <include name="*.jar"/>

        </fileset>

    </path>


    <target name="clean">

        <delete dir="${webdir}"/>

        <mkdir dir="${webClassdir}"/>

    </target>


    <target name="copy">

        <copy todir="${webdir}">

            <fileset dir="${sourcedir}">

                <exclude name="**/*.java"/>

            </fileset>

        </copy>

    </target>

    
    <target name="compile" depends="clean, copy">

      <javac srcdir="${javaSourcedir}"

             destdir="${webClassdir}"

             classpathref="libraries"/>

      

      <!-- one for deployment, another one for reference -->

      <war warfile="demo.war" basedir="${webdir}" webxml="${webdir}/WEB-INF/web.xml">

          <exclude name="WEB-INF/web.xml"/>

      </war>

      <war warfile="../demo.war" basedir="${webdir}" webxml="${webdir}/WEB-INF/web.xml">

          <exclude name="WEB-INF/web.xml"/>

      </war>

      <delete dir="${webdir}"/>

    </target>

</project>
11) write a servlate program to change inactive time interval session.

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