Login/Logout With Session
In this section, we are going to develop a login/logout
application with session. This application checks the user authentication.
Whenever you run, it takes a user id and a password (Both the user id and
password is "admin") it displays the welcome page, when both
fields are correctly filled.
Create an action mapping in the struts.xml file. Here
is the code to be added in the struts.xml:
<action name="login" class="net.roseindia.loginAction" >
<result name="success" type="dispatcher">/pages/uiTags/Success.jsp</result>
<result name="error" type="redirect">/pages/uiTags/Login.jsp</result>
</action>
<action name="logout" class="net.roseindia.logoutAction" >
<result name="success" type="redirect">/pages/uiTags/checkLogin.jsp</result>
</action> |
Develop an action class that handles the login request.
The Struts 2 framework provides a base ActionSupport class that
implements commonly used framework interfaces. In our action class (loginAction.java)
we have extended ActionSupport class.
Here is the code of "loginAction"
action class:
package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ActionContext;
import java.util.*;
public class loginAction extends ActionSupport {
private String userId;
private String password;
public String execute() throws Exception{
if ("admin".equals(userId) && "admin".equals(password)) {
Map session = ActionContext.getContext().getSession();
session.put("logged-in","true");
return SUCCESS;
}
else{
return ERROR;
}
}
public String logout() throws Exception {
Map session = ActionContext.getContext().getSession();
session.remove("logged-in");
return SUCCESS;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
}
|
Download this code.
Again, develop an action class to handle the logout
operation. An action class (logoutAction)
we have extended ActionSupport class.
Here is the code of logoutAction
action class:
package net.roseindia;
import javax.servlet.http.HttpSession;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ActionContext;
import java.util.*;
public class logoutAction extends ActionSupport {
public String execute() throws Exception {
Map session = ActionContext.getContext().getSession();
session.remove("logged-in");
return SUCCESS;
}
}
|
Download this code.
Develop Login Form: The GUI of the application
consists of login form (Login.jsp). The "Login.jsp"
displays the login page to the user.
Here is the code of Login.jsp file:
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" contentType="text/html"%>
<html>
<head>
<title>Insert Data here!</title>
<link href="<s:url value="/css/main.css"/>" rel="stylesheet"
type="text/css"/>
</head>
<body>
<s:form action="/roseindia/login.action" method="POST">
<s:textfield name="userId" label="Login Id"/><br>
<s:password name="password" label="Password"/><br>
<s:submit value="Login" align="center"/>
</s:form>
</body>
</html>
|
The "Success.jsp" page displays the
Login Success message (Welcome, you have logged-in.) and session (Session
Time: Wed Aug 01 11:26:38 GMT+05:30 2007 and Logout ) when user gets
successful authentication. If you click the "Logout" then again
login page is displayed on the screen.
Here is the code of Success.jsp file:
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" contentType="text/html" import="java.util.*"%>
<jsp:include page="/struts2tags/pages/uiTags/loginCheck.jsp" />
<html>
<head>
<title>Welcome, you have logined!</title>
</head>
<body>
Welcome, you have logined. <br />
<b>Session Time: </b><%=new Date(session.getLastAccessedTime())%>
<br /><br />
<a href="<%= request.getContextPath() %>/roseindia/logout.action">Logout</a>
<br />
</body>
</html>
|
This page logs out the valid user.
checkLogin.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" contentType="text/html" import="java.util.*"%>
<html>
<head>
<title>Check validate!</title>
</head>
<body>
<s:if test="#session.login != 'admin'">
<jsp:forward page="/pages/uiTags/Login.jsp" />
</s:if>
</body>
</html>
|
Output:
Run this application by getting the login page:
Enter the wrong user id and password in the login page
You get the following output:
Enter the correct user id and password in the login
page:
You get the following output:
After clicking the "Logout". You get
the following output:
|
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Current Comments
8 comments so far (post your own) View All Comments Latest 10 Comments:I'm a beginer of Struts Framework Programing.
i just started with this Login tiutorial but i got error at Runtime like this.
"The Struts dispatcher cannot be found. This is usually caused by using
Struts tags without the associated filter. Struts tags are only usable
when the request has passed through its servlet filter, which initializes
the Struts dispatcher needed for this tag. "
at org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:60) which is the
inbuit class file of strtus.jar file .
i'm using Oracle's Jdeveloper for development.
plz give me solution for this problem as soon as possible.
Thank you,
Rose India
Posted by Mayank Patel on Monday, 05.12.08 @ 14:24pm | #59449
<s:if test="#session.login != 'admin'">
where does login come from?
Posted by struts beginner on Saturday, 05.10.08 @ 02:53am | #59055
Thanks for giving these tutorials which will help all the beginners in struts.
I have some doubt in this tutorial(Login/Logout With Session). I am listing it below.
1) What's the need of
public String logout() throws Exception {
Map session = ActionContext.getContext().getSession();
session.remove("logged-in");
return SUCCESS;
}
in loginAction.java
2)what's the need of
<jsp:include page="/struts2tags/pages/uiTags/loginCheck.jsp" />
in Success.jsp
I got the results without these. So what for it is written?
Hope i will get help form yours.
Thanks in Advance
Struts
Posted by sarin on Tuesday, 03.18.08 @ 10:20am | #53142
Highly informative for struts2 beginners.
many thanks
Posted by dtrprasad on Wednesday, 03.12.08 @ 20:26pm | #52492
Hi, I'm currently learning the Struts2 through this tutorial, but at this page, I got some error. When I do exactly what this page said, I can't access the login.action, it says that there's some null pointer exception; then I delete the "type=redirect" in the struts.xml file, in the login action, it works. I don't know the reason:(
and my jdk is 1.5.0.13, tomcat version 6.0.16
can any one explain this? Thanks:)
Posted by stanley on Wednesday, 02.27.08 @ 08:30am | #50264
my question is the same of vijaykumar
Posted by Cynthiadave on Sunday, 12.16.07 @ 06:01am | #42566
The Success.jsp has this include - but I don't see where it is, and the struts2tutorial.zip is missing all kinds of files from here.
Posted by Sean on Saturday, 12.8.07 @ 02:25am | #41570
Hi
it is very usefull site for begginers like me. i have gone through this sessions. i am having query related to session.put("logged-in","true").my query here is where do we use those objects which are declared in
session.put().
i would like to know about this.can any one help me here...........
Posted by vijaykumar on Tuesday, 11.27.07 @ 13:02pm | #40676