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Creation of simple login application using Servlet, Testing the application using JUnit, and Deloying the application into Apache server.

Here I am using Eclipse for developing this application. In this application i hard coded user name and password. In real application these values are fetched from database.

1. Create a new dynamic web project and name it as ServletStudy.

2. Inside the WebContent folder ,create a index.jsp file and include the following code.

      <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
          pageEncoding="ISO-8859-1"%>
          <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org 
          /TR/html4/   loose.dtd">
         <html>
              <head>
                  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
                  <title>Login</title>
              </head>
             <body>
                <form method="post" action="loginController">
                     User Name: <input type="text" name="userName" /> <br/>
                     Password: <input type="password" name="password" /><br/>
                    <input type="submit" name="submit" value="Login" /><br/>   
                </form>
             </body>
         </html>

3. Inside the WebContent folder, create a new success.jsp file and include the following code.

        <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
         pageEncoding="ISO-8859-1"%>
        <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org
          /TR/html4/loose.dtd">
        <html>
           <head>
               <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
               <title>Login Success</title>
           </head>
            <body>
              <h3>Successfully logged into your home page </h3>
           </body>
      </html>

4. Inside the WebContent folder, create a new loginfailure.jsp file and include the following code.
        <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
              pageEncoding="ISO-8859-1"%>
        <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org
        /TR/html4/loose.dtd">
       <html>
           <head>
                <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
                <title>Login Failure</title>
          </head>
          <body>
                <h3>Your username or password incorrect... </h3>
         </body>
      </html>


5. Inside the src folder create a com.util package. Create a new LoginCheck class into inside a com.util package. Add one new checkUserNameAndpassword function  into LoginCheck class and include the following code.


package com.utils;

public class LoginCheck {
      public boolean checkUserNameAndPassword(String userName,String password){
            boolean loginStatus = false;
            if((userName.equals("admin") && password.equals("admin"))){
                  loginStatus = true;
            }
            return loginStatus;
      }
}

6. Inside the src folder create a com.test package. Inside the com.test package, create a one new LoginControllerTest class, the class extends the Junit TestCase. Include the following code into LoginControllerTest class.


package com.test;

import com.utils.LoginCheck;

import junit.framework.TestCase;

public class LoginControllerTest extends TestCase{
      private LoginCheck loginCheck = null;
      public void setUp(){
            try {
                  loginCheck = new LoginCheck();
                  super.setUp();
            } catch (Exception e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
            }
      }
      public void tearDown(){
            try {
                  loginCheck = null;
                  super.tearDown();
            } catch (Exception e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
            }
      }

      public void testCheckUserNameAndPassword(){
            assertTrue(loginCheck.checkUserNameAndPassword("admin", "admin"));
            assertFalse(loginCheck.checkUserNameAndPassword("admin", "password"));
      }
}




7. Inside the LoginControllerTest class Right click --> Run as --> Junit test . Check whether the test are passed or not.

8. Create a new servlet and name it as LoginController as show here.


package com.controller;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/LoginController")
public class LoginController extends HttpServlet {
      private static final long serialVersionUID = 1L;

      public LoginController() {
        super();
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            String userName = request.getParameter("userName");
            String password = request.getParameter("password");
            if((userName.equals("admin") && password.equals("admin"))){
                  //Redirect to success page.
                  response.sendRedirect("success.jsp");
            }
            else{
                  //Redirect error page.
                  response.sendRedirect("loginfailure.jsp");
            }
      }
}

9. Configuration of web.xml file and servlet mapping. Include the following code into web.xml file.


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>ServletStudy</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
      <servlet-name>LoginController</servlet-name>
      <servlet-class>com.controller.LoginController</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>LoginController</servlet-name>
      <url-pattern>/loginController</url-pattern>
  </servlet-mapping>
</web-app>
  
The final file structure look likes

 
10. Creating war file and deploying into tomcat server.

         Right click a ServletStudy root folder --> Export -->Choose WAR --> Give application name and select your file path for where you want to store a WAR file. Refer the below screen shots.



11. After creating war go to your tomcat installed path. Here I am installed tomcat in following location. "D:\Apache Tomcat 7.0.11".
             Go to tomcat bin directory and run the tomcat server ie run the startup.bat present in "D:\Apache Tomcat 7.0.11\bin".

      If you have any problem in server start up check your java environment variable setups in windows.




12. Copied your war file and paste into webapps folder.
      Now your application was successfuly deployed into apache server.
      Trying to access the application through following url.
       http://localhost:8080/ServletStudy/
         The port number was based on your tomcat server setup. If you want to know your port number then go to your config folder and open the server.xml file and check the Connector port value.


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