SWAPNA MEDIKONDA: Write a program to receive two numbers from a HTML form and display their sum in the browser by using HttpServlet.

Aim: Write a program to receive two numbers from a HTML form and display their sum in the browser by using HttpServlet.

Program:

sum.html

<html>

<body>

<center>

<form name="Form1" method="post"

action="Add">

<table>

<tr>

<td><B>Enter First Number</td>

<td><input type=textbox name="First Number" size="25" value=""></td>

</tr>

<tr>

<td><B>Enter Second Number</td>

<td><input type=textbox name="Second Number" size="25" value=""></td>

</tr>

</table>

<input type=submit value="Submit">

</body>

</html>

Add.java

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class Add

extends HttpServlet

{

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException

{

// Get print writer.

response.getContentType("text/html");

PrintWriter pw = response.getWriter();

// Get enumeration of parameter names.

Enumeration e = request.getParameterNames();

// Display parameter names and values.

int sum=0;

while(e.hasMoreElements())

{

String pname = (String)e.nextElement();

pw.print(pname + " = ");

String pvalue = request.getParameter(pname);

sum+=Integer.parseInt(pvalue);

pw.println(pvalue);

}

pw.println("Sum = "+sum);

pw.close();

}

}

web.xml( add following tags in web.xml)

<servlet>

<servlet-name>Add</servlet-name>

<servlet-class>Add</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>Add</servlet-name>

<url-pattern>/Add</url-pattern>

</servlet-mapping>

Output:

1. create .class file by compilining java file

2. places .class file in webapps -> servlets(folder created by program developer) -> WEB-INF -> classes

3. Add <servlet> and <servlet-mapping> tags in web.xml

4. run tomcat7( from bin folder)

5. type URL http://localhost:8080/servlets/sum.html

We will get

Enter numbers in two fields and press submit button

prints output like following