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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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