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Friday, 11 October 2019

Login Form with validation in java

Login Form with validation in java:

In this tutorial we will discuss how to create a simple login form in java by using Servlet conecpt in java. we will send the data on the server as well  by using servlet only.

Components:

In  order to create a  login form we need to create following files.
1. login.java
2. login .java
2.web.xml

IDE:

We will use eclipse IDE :

1.Login.html File

<!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>Insert title here</title>
</head>
<body>
<form method="get" action="./IndexServlet">
UserName: <input type="text" name="uname"><br><br>
Password: <input type="password" name="pswd"><br><br>
Email-Id: <input type="text" name="em"><br><br>
<select>
<option value="male">male</option>
<option value="female">female</option>
<option value="other">other</option>

</select>
<br><br>
<input type="submit" value="submit">
</form>
</body>
</html>


2.Login.java File


package com.epert;

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 IndexServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

    
    public IndexServlet() {
        // TODO Auto-generated constructor stub
    }

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
response.setContentType("text/html");
PrintWriter pw=response.getWriter();
pw.println("<h1 style='color:red'>This is ourlogin form</h1>");
pw.println("<br>");
String uname=request.getParameter("uname");
String pswd=request.getParameter("pswd");
String em=request.getParameter("em");
if(uname.equals("viren")&&pswd.equals("sharma")&&em.equals("viren@gmail.com"))
{
pw.println("login successfully");
pw.println("<br>");
pw.println("username:"+uname);
pw.println("<br>");
pw.println("password:"+pswd);
}
else
{
pw.println("login faild");
}

}


3.Web.xml

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>expirement</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>

  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>IndexServlet</display-name>
    <servlet-name>IndexServlet</servlet-name>
    <servlet-class>com.epert.IndexServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>IndexServlet</servlet-name>
    <url-pattern>/IndexServlet</url-pattern>
  </servlet-mapping>

</web-app>


Start the server and access Our application:







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