Menambah dan Mengalikan Angka dengan servlet di java

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package siregar.romauli.siregar.servlet;

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 toshiba
 */
public class FirstServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response, String str)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String txt = "";
        try {
            if (str != null) {
                txt = str;
            }
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet FirstServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet FirstServlet at " + request.getContextPath() + "</h1>");
            out.println("<p>");
            out.println("<h2>");
            out.println("Hello :).... ");
            out.println("<p>");
            out.println("Hasilnya Adalah " + txt);
            out.println("</h2>");
            out.println("<form method=\"GET\" action=\"FirstServlet\">");
            out.println("<input type=\"text\" name=\"valOne\" value=\"\">");
            out.println("OPERATOR");
            out.println("<input type=\"text\" name=\"valTwo\" value=\"\">");
            out.println("<p>");
            out.println("<input type=\"submit\" value=\"ADD\">");
            out.println("<p>");
            out.println("</form>");
            out.println("<form method=\"POST\" action=\"FirstServlet\">");
            out.println("<input type=\"text\" name=\"valOne\" value=\"\">");
            out.println("OPERATOR");
            out.println("<input type=\"text\" name=\"valTwo\" value=\"\">");
            out.println("<p>");
            out.println("<input type=\"submit\" value=\"MULTIPLY\">");
            out.println("</form>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        int rslt;
        String result = null;
        String paramOne = null;
        String paramTwo = null;

        paramOne = request.getParameter("valOne");
        paramTwo = request.getParameter("valTwo");
        rslt = Integer.parseInt(paramOne) + Integer.parseInt(paramTwo);
        result = String.valueOf(rslt);

        processRequest(request, response, result);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        int rslt;
        String result = null;
        String paramOne = null;
        String paramTwo = null;

        paramOne = request.getParameter("valOne");
        paramTwo = request.getParameter("valTwo");

        rslt = Integer.parseInt(paramOne) * Integer.parseInt(paramTwo);
        result = String.valueOf(rslt);
        processRequest(request, response, result);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}

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