Login & Logout Application using HttpSession

Hi friends, let’s see a login and logout application using HttpSession

Required Files:

 

 

 

  1. index.html
  2. link.html
  3. LoginServlet.java
  4. LogoutServlet.java
  5. ProfileServlet.java
  6. web.xml
First look the following project structure:

servlet-login-1

index.html

<html> 
<body> 
<h1>Login Application using HttpSession</h1> 
<a href="login.html">Login</a>
<a href="LogoutServlet">Logout</a>
<a href="ProfileServlet">Profile</a>
</body> 
</html>

 

link.html

<html> 
<body> 
<a href="login.html">Login</a>
<a href="LogoutServlet">Logout</a>
<a href="ProfileServlet">Profile</a>
<hr> 
</body> 
</html>

 

login.html

<html> 
<body> 
<form action="LoginServlet">
<table> 
<tr> 
<td>UserName</td> 
<td><input type="text" name="uname"></td>
</tr> 
<tr> 
<td>Password</td> 
<td><input type="password" name="pass"></td>
</tr> 
<tr> 
<td><input type="submit" value="login"></td>
</tr> 
</table> 
</form> 
</body> 
</html>

LoginServlet.java

package java8s; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.io.*; 
public class LoginServlet extends HttpServlet { 
     
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
          
          response.setContentType("text/html"); 
          PrintWriter out=response.getWriter(); 
          
          request.getRequestDispatcher("link.html").include(request, response); 
          
          String s1=request.getParameter("uname"); 
          String s2=request.getParameter("pass"); 
          
          if(s2.equals("silan")) 
          { 
              out.print("login is successful"); 
              HttpSession session=request.getSession(); 
              session.setAttribute("user", s1); 
          } 
          else 
          { 
              out.print("sry!! invalid password"); 
               request.getRequestDispatcher("login.html").include(request, response); 
          } 
     } 
}


 

LogoutServlet.java

package java8s; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.io.*; 
public class LogoutServlet extends HttpServlet { 
     
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
          
          response.setContentType("text/html"); 
          PrintWriter out=response.getWriter(); 
          
          HttpSession session=request.getSession(); 
          session.invalidate(); 
          
          out.print("U have successfully logged out"); 
     } 
}

ProfileServlet.java

package java8s; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.io.*; 
public class ProfileServlet extends HttpServlet { 
     
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
          
          response.setContentType("text/html"); 
          PrintWriter out=response.getWriter(); 
          
          HttpSession session=request.getSession(false); 
          
          if(session!=null
          { 
              String s=(String)session.getAttribute("user"); 
              out.print("Hii"+s+""+"Welcome 2 SILAN TECHNOLOGY"); 
          } 
          else 
          { 
              out.print("sry!!U have to login first"); 
               request.getRequestDispatcher("login.html").include(request, response); 
          } 
          
          
          
     }
}

 

web.xml

<web-app> 
<display-name>LoginApp</display-name> 
  <servlet> 
  <servlet-name>abc</servlet-name> 
  <servlet-class>java8s.LoginServlet</servlet-class> 
  </servlet> 
  <servlet-mapping> 
  <servlet-name>abc</servlet-name> 
  <url-pattern>/LoginServlet</url-pattern> 
  </servlet-mapping> 
  
  <servlet> 
  <servlet-name>def</servlet-name> 
  <servlet-class>java8s.LogoutServlet</servlet-class> 
  </servlet> 
  <servlet-mapping> 
  <servlet-name>def</servlet-name> 
  <url-pattern>/LogoutServlet</url-pattern> 
  </servlet-mapping> 
  
  <servlet> 
  <servlet-name>demo</servlet-name> 
  <servlet-class>java8s.ProfileServlet</servlet-class> 
  </servlet> 
  <servlet-mapping> 
  <servlet-name>demo</servlet-name> 
  <url-pattern>/ProfileServlet</url-pattern> 
  </servlet-mapping> 
  
  
  <welcome-file-list> 
    <welcome-file>index.html</welcome-file> 
  </welcome-file-list> 
</web-app>

 

Output

servlet-login-2

Now if u click on profile menu, then u will get


servlet-login-3

Without login if u will click on profile menu, then u will get


servlet-login-4

When u will click on logout menu, then u will get


servlet-login-5
 

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