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 |
| | <[EMAIL PROTECTED]|
| | .com> |
| | |
| | 03/11/2003 06:23 |
| | AM |
| | Please respond to|
| | "Struts Users |
| | Mailing List" |
|---------+---------------------------->
>------------------------------------------------------------------------------------------------------------------------------|
|
|
| To: [EMAIL PROTECTED]
|
| 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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