In this tutorial you will learn how to delete/destroy session in servlet
Destroying A Session
To destroy a session you can either call session.invalidate() method or session.setMaxInactiveInterval(0). An example given below illustrates the how to destroy the session.
login.html
<HTML> <HEAD> <TITLE> Login Page </TITLE> </HEAD> <BODY> <BODY bgcolor=lightblue> <form name=login method="get" action="http://localhost:8080/destroysession/create"> <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>
SessionDestroyExample.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 SessionDestroyExample 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);
session.setAttribute("loggedUser", name);
out.println("<Center><h3>");
out.println("Session Created");
out.println("<br>Session Id - ");
out.println(session.getId());
out
.println("<br><a href=\"http://localhost:8080/destroysession/destroy\">Destroy Session </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);
}
}
DestroySession.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;
import org.apache.tools.ant.types.PatternSet.NameEntry;
public class DestroySession extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
PrintWriter out = response.getWriter();
response.setContentType("text/html");
HttpSession session = request.getSession(false);
String name = null;
if (session != null) {
name = (String) session.getAttribute("loggedUser");
}
if (name.equalsIgnoreCase("web")) {
session.removeAttribute("loggedUser");
session.invalidate();
// session.setMaxInactiveInterval(0);
out.println("<h1><center>");
out.println("Session Deleted........");
out.println("</center><h1>");
} else {
out.println("<h1><center>");
out.println("Session is not Maintained");
out.println("</center><h1>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
doGet(request, response);
}
}
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>SessionDestroyExample</servlet-name> <servlet-class>roseindia.net.SessionDestroyExample</servlet-class> </servlet> <servlet> <servlet-name>Destroy</servlet-name> <servlet-class>roseindia.net.DestroySession</servlet-class> </servlet> <!-- Servlet Mapping--> <servlet-mapping> <servlet-name>SessionDestroyExample</servlet-name> <url-pattern>/create</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Destroy</servlet-name> <url-pattern>/destroy</url-pattern> </servlet-mapping> </web-app>When you run this application it will display message as shown below:
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