ats1999/ServletDemo.java

## index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Login Demo</title>
</head>
<body>
<form action="demo" method="post">
	<h1 style="font-size:40px;">Login : </h1>
	Enter User name:
	<input  type="text" name='user' placeholder="Enter user name" value="Rahul"><br><br>
	Enter number:
	<input type="number" name="number" placeholdr="enter number" value="9507271781"><br>
	<input type="submit"  value="submit">
</form>
</body>
</html>

## read.md

      
    Raw
  

              read.md
            
          
    File


ServletDemo.java
This file contains all the method required to fulfill client requirements.
index.html
This file called, when client request through url for the first time.
web.xml
This file is containg all the mapping information of servlet and url's information.

Demo:- When user visit the URL


After request served by servlet.


## ServletDemo.java
package number;

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;

/**
 *
 * @author Rahul kumar
 * @version 1.0
 * @category Assingment
 * @see This program is written to test and execute servlet.
 */
public class ServletDemo extends HttpServlet{
	/**
	 * This method is by default called by Tomcat.
	 * @param nothing
	 * @return nothing
	 */
	public void init(){
		// do notheing
	}
	/**
	 * This method is called only, whena client request for this servlet by POST request.
	 * @param req res
	 * @return text/html
	 * @throws ServletException IOException
	 */
	public void doPost(HttpServletRequest req, HttpServletResponse res)
	throws ServletException,IOException{
		// get writer
		PrintWriter pw=res.getWriter();
		// set response type
		res.setContentType("text/html");
		// get parameter
		String name=req.getParameter("user");
		String num=req.getParameter("number");
		// send output to the client
		pw.print("<h1> Hi, "+name+" Your mobile number is: "+num);
	}
	/**
	 * This method is called by servlet container. It is part of servlet lifecycle.
	 * @param nothing
	 * @return nothing
	 */
	public void destroy(){
		// do nothing
	}
}

## 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_3_0.xsd" version="3.0">
  <display-name>Mobile number</display-name>
  <!-- servlet to take input from user -->
  <servlet>
  	<servlet-name>Demo</servlet-name>
  	<servlet-class>number.ServletDemo</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>Demo</servlet-name>
  	<url-pattern>/demo</url-pattern>
  </servlet-mapping>
</web-app>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="ISO-8859-1">
	<title>Login Demo</title>
	</head>
	<body>
	<form action="demo" method="post">
	<h1 style="font-size:40px;">Login : </h1>
	Enter User name:
	<input type="text" name='user' placeholder="Enter user name" value="Rahul"><br><br>
	Enter number:
	<input type="number" name="number" placeholdr="enter number" value="9507271781"><br>
	<input type="submit" value="submit">
	</form>
	</body>
	</html>
	package number;

	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;

	/**
	*
	* @author Rahul kumar
	* @version 1.0
	* @category Assingment
	* @see This program is written to test and execute servlet.
	*/
	public class ServletDemo extends HttpServlet{
	/**
	* This method is by default called by Tomcat.
	* @param nothing
	* @return nothing
	*/
	public void init(){
	// do notheing
	}
	/**
	* This method is called only, whena client request for this servlet by POST request.
	* @param req res
	* @return text/html
	* @throws ServletException IOException
	*/
	public void doPost(HttpServletRequest req, HttpServletResponse res)
	throws ServletException,IOException{
	// get writer
	PrintWriter pw=res.getWriter();
	// set response type
	res.setContentType("text/html");
	// get parameter
	String name=req.getParameter("user");
	String num=req.getParameter("number");
	// send output to the client
	pw.print("<h1> Hi, "+name+" Your mobile number is: "+num);
	}
	/**
	* This method is called by servlet container. It is part of servlet lifecycle.
	* @param nothing
	* @return nothing
	*/
	public void destroy(){
	// do nothing
	}
	}
	<?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_3_0.xsd" version="3.0">
	<display-name>Mobile number</display-name>
	<!-- servlet to take input from user -->
	<servlet>
	<servlet-name>Demo</servlet-name>
	<servlet-class>number.ServletDemo</servlet-class>
	</servlet>
	<servlet-mapping>
	<servlet-name>Demo</servlet-name>
	<url-pattern>/demo</url-pattern>
	</servlet-mapping>
	</web-app>