Get Session Id
In this example we are going to make a program in which
we will find the session id which was generated by the container.
HttpSession session = request.getSession();
Inside the service method we ask for the session and every thing gets
automatically, like the creation of the HttpSession object. There is no need to
generate the unique session id. There is no need to make a new Cookie
object. Everything happens automatically behind the scenes.
As soon as call the method getSession() of the
request object a new object of the session gets created by the container and a
unique session id generated to maintain the session. This session id is
transmitted back to the response object so that whenever the client makes any
request then it should also attach the session id with the requsest object so
that the container can identify the session.
The code of the program is given below:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionIdServlet extends HttpServlet{
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
HttpSession session = request.getSession();
String id = session.getId();
pw.println("Session Id is : " + id);
}
}
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web.xml file for this program:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Zulfiqar</servlet-name>
<servlet-class>SessionIdServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Zulfiqar</servlet-name>
<url-pattern>/SessionIdServlet</url-pattern>
</servlet-mapping>
</web-app>
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The output of the program is given below:
Download this
example:
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Del.icio.us
Digg
Google
Spurl
Blink
Furl
Simpy
Y! MyWeb
