Java Servlet login Example

  Java Servlet login Example

index.html

<form action="login" method="post">

   <table>

   <tr>

      <td><font face="verdana" size="2px">Name:</font></td>

      <td><input type="text" name="userName"></td>

   </tr>

   <tr>

      <td><font face="verdana" size="2px">Password:</font></td>

      <td><input type="password" name="userPassword"></td>

   </tr>

   </table>

      <input type="submit" value="Login">

</form>

OnServletLogin.java

package java4s;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class OnServletLogin extends HttpServlet  

{

    protected void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException

            {

                        PrintWriter pw=res.getWriter();

                        res.setContentType("text/html");

                        String user=req.getParameter("userName");

                        String pass=req.getParameter("userPassword");

                        if(user.equals("java4s")&&pass.equals("java4s"))

                 pw.println("Login Success...!");

                else

                 pw.println("Login Failed...!");

                         pw.close();

            }

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

 <servlet>

   <servlet-name>loginServlet</servlet-name>

   <servlet-class>java4s.OnServletLogin</servlet-class>

 </servlet>

  <servlet-mapping>

   <servlet-name>loginServlet</servlet-name>

   <url-pattern>/login</url-pattern>

 </servlet-mapping>

  <welcome-file-list>

   <welcome-file>index.html</welcome-file>

 </welcome-file-list>

 </web-app>