Servlet Login Example

This is a basic Servlet Login example without using any database!!

Files Required

• >OnServletLogin.java
• >index.html
• >web.xml

Jars required for this is  javax.servlet-3.0 to download this jar click here 

and copy this jar to your lib folder

Required directory Structure:

now step 1:

create package  servlet login and a class with name OnServletLogin:

and paste this code in your class 

OnServletLogin.java:

package servletlogin;

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");

pw.print("<font face='verdana'>");

       if(user.equals("chetan")&&pass.equals("1234"))

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

else

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

       

   pw.print("</font>");

pw.close();

}

}

now we will create a view page 

index.html:

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

<table>

<tr>

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

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

</tr>

<tr>

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

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

</tr>

</table>

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

</form>

</font>

now we will do our mapping in our web.xml file :

<?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>servletlogin.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>

after this run your program and if every thing goes right you will see the view page on the browser

 now enter name=chetan 

&

password =1234

and hit enter .