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From MBre...@cpaglobal.com
Subject Re: Session Times Out
Date Mon, 03 Nov 2003 09:52:54 GMT





Make a custom tag like so :



Create a tld file with this in  it :

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library
1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
      <tlibversion>1.0</tlibversion>
      <jspversion>1.1</jspversion>
      <shortname>Tag Libs</shortname>
      <info>ustom Tags</info>
      <tag>
            <name>checkLogin</name>
            <tagclass>com.cpaglobal.cpadirect.tag.CheckLogin</tagclass>
            <bodycontent>empty</bodycontent>
            <info>Checks the login status of a user and forward them to the
login page if not logged in.</info>
            <attribute>
                  <name>loginPage</name>
                  <required>false</required>
                  <rtexprvalue>false</rtexprvalue>
            </attribute>
            <attribute>
                  <name>default</name>
                  <required>false</required>
                  <rtexprvalue>false</rtexprvalue>
            </attribute>
      </tag>
</taglib>



Code for the custom tag :

package com.cpaglobal.cpadirect.tag;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import com.cpaglobal.cpadirect.applicationlogic.SessionVariables;
import com.cpaglobal.cpadirect.applicationlogic.User;


public class CheckLogin extends TagSupport {


      private String loginPage = "/JSP/Timeout.jsp";


      public void setLoginPage(String loginPage) {
            this.loginPage = loginPage;
      }

      public int doStartTag() throws JspException {
         return (SKIP_BODY);
      }

      public int doEndTag() {
            try {
                  HttpSession session = pageContext.getSession();
                  if (session != null) {
                        User user = (User)
session.getAttribute(SessionVariables.SESSION_LOGGED_ON_USER);
                        if (user == null) {
                              pageContext.forward(loginPage);
                              return (SKIP_PAGE);
                        }
                  } else {
                        pageContext.forward(loginPage);
                        return (SKIP_PAGE);
                  }
            } catch(ServletException e) {
                  new JspException(e.toString());
            } catch(IOException e) {
                  new JspException(e.toString());
            }
            return (EVAL_PAGE);
      }

}

How to use it :

<%@ taglib uri="/WEB-INF/cpa.tld" prefix="cpa"%>
<cpa:checkLogin/>

Mike




|---------+---------------------------->
|         |           Caroline Jen     |
|         |           <jiapei_jen@yahoo|
|         |           .com>            |
|         |                            |
|         |           03/11/2003 06:23 |
|         |           AM               |
|         |           Please respond to|
|         |           "Struts Users    |
|         |           Mailing List"    |
|---------+---------------------------->
  >------------------------------------------------------------------------------------------------------------------------------|
  |                                                                                      
                                       |
  |       To:       struts-user@jakarta.apache.org                                       
                                       |
  |       cc:                                                                            
                                       |
  |       Subject:  Session Times Out                                                    
                                       |
  >------------------------------------------------------------------------------------------------------------------------------|




I check if session expires for each action in the
application.  If the session times out, I forward the
user to index.jsp so that the user can log on again.

How do I inform the user with a message that he/she is
at the welcome page because the session has expired?

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