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Create Addition Program using JSP and Servlet

Step1st:-   Create a JSP web page and design form using HTML Form Content.
      
                <form action="ServletName" method="post">
              
                 </form>



Step2nd:-  Create Servlet and Write Code under doPost() in eclipse otherwise in Netbeans processRequest() which is used define method which will be called under doGet() and doPost()


                int a = Integer.parseInt(request.getParameter("textfiledname"));

     request is the Object of HttpRequest class and getParameter() is used to get the data of HTML component(textfield,radio,checkbox,etc)

 Complete Code explanation:
Code of JSP:-


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form method="post" action="AdditionSer">
            <input type="text" name="txtnum1" placeholder="Enter First Number" />
            <br>
            <br>
            <input type="text" name="txtnum2" placeholder="Enter Second Number" />
            <br>
            <br>
            <input type="submit" name="btnsubmit"  value="Submit"  />
           
        </form>
    </body>
</html>

Code of Servlet:-

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
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 AdditionSer extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
          int a = Integer.parseInt(request.getParameter("txtnum1"));
          int b = Integer.parseInt(request.getParameter("txtnum2"));
          int c = a+b;
          out.print("result is "+c);
        }
    }

      @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

       @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

   




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