Session Time Out Example
You can set the session time out in two ways either in web.xml file or in servlet.
You can set session time out in web.xml as
<session-config>
<session-timeout>30</session-timeout>
</session-config>
Here 30 minutes is the maximum time out.
To set session time out in servlet you need to call session.getMaxInactiveInterval(300). Here 300 second is the time out .
An example is given below which illustrates the above concepts.
login.html
<HTML> <HEAD> <TITLE> Login Page </TITLE> </HEAD> <BODY> <BODY bgcolor=lightblue> <form name=login method="get" action="http://localhost:8080/sessiontimeout/timeout"> <center> <h1>Enter your Name and Pasword </h1><br> <table border=1> <tr><td>Enter Your Name :</td> <td><input type="text" name="userName" value=""></td> <tr><td align=center><input type="submit" name="Submit" value="Submit" ></td> <td align=center><input type="reset" name="reset" value="Refresh"></td> <table> </center> </form> </BODY> </HTML>
SessionTimeout.java
package roseindia.net;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class SessionTimeout extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
PrintWriter out = response.getWriter();
response.setContentType("text/html");
String name = request.getParameter("userName");
if (name.equalsIgnoreCase("web")) {
out.println("<Center><h3>");
out.println("Creating A New Session...........");
out.println("</h3></Center>");
HttpSession session = request.getSession(true);
//Setting Session Inactive Time Out
session.setMaxInactiveInterval(20);
session.setAttribute("loggedUser", name);
out.println("<Center><h3>");
out.println("Session Created");
out.println("<br>Session Id - ");
out.println(session.getId());
out.println("<a href=\"http://localhost:8080/sessiontimeout/check\">Check Time Out</a>");
out.println("</h3></Center>");
} else {
out.println("<h1>");
out.println("Please enter the name \"web\"");
out.println("<h1>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
doGet(request, response);
}
}
TimeoutCheck.java
package roseindia.net;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class TimeoutCheck extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
PrintWriter out = response.getWriter();
response.setContentType("text/html");
String name = null;
HttpSession session = request.getSession(false);
if (session != null) {
name = (String) session.getAttribute("loggedUser");
out.println("<center><h1>");
out.println("Logged User is - ");
out.println(name);
out.println("</h1></center>");
} else {
out.println("<center><h1>");
out.println("Session Session Time Out");
out.println("</h1></center>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>CreateSession</display-name> <!-- Servlet --> <servlet> <servlet-name>SessionTimeout</servlet-name> <servlet-class>roseindia.net.SessionTimeout</servlet-class> </servlet> <servlet> <servlet-name>TimeoutCheck</servlet-name> <servlet-class>roseindia.net.TimeoutCheck</servlet-class> </servlet> <!-- Servlet Mapping--> <servlet-mapping> <servlet-name>SessionTimeout</servlet-name> <url-pattern>/timeout</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>TimeoutCheck</servlet-name> <url-pattern>/check</url-pattern> </servlet-mapping> <!-- Setting Session Time Out--> <session-config> <session-timeout>2</session-timeout> </session-config> </web-app>When you run this application it will display message as shown below:
 |
After 20 Seconds
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