Answer to Question #3915 in Java | JSP | JSF for shiva

Question

Answer to Question #3915 in Java | JSP | JSF for shiva

Question #3915

Write a servlet that lets a user vote for his favorite food from a combo box or radio buttons (the user must able to make multiple food selection per request)

Expert's answer

Index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Main page</title>
 </head>
 <body>
 <h1>Please, choose Your favorite food</h1>
 <form action="https://localhost:8080/WebApplication/FoodServlet" method="post">
 <input type="checkbox" name="food" value="Meat">Meat<br/>
 <input type="checkbox" name="food" value="Fish">Fish<br/>
 <input type="checkbox" name="food" value="Cheese">Cheese<br/>
 <input type="checkbox" name="food" value="Fruit">Fruit<br/>
 <input type="checkbox" name="food" value="Salad">Salad<br/>
 <input type="checkbox" name="food" value="Dessert">Dessert<br/>
 <input type="checkbox" name="food" value="Drink">Drink<br/>
 <input type="submit" value="OK">
 </form>
 </body>
</html>

FoodServlet.java


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 FoodServlet 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)
 throws ServletException, IOException {
 response.setContentType("text/html;charset=UTF-8");
 PrintWriter out = response.getWriter();
 String[] food = request.getParameterValues("food");

 try {
 /*
 * TODO output your page here. You may use following sample code.
 */
 out.println("<html>");
 out.println("<head>");
 out.println("<title>User choise</title>");
 out.println("</head>");
 out.println("<body>");
 out.println("<h1>User choise:</h1>");
 out.println("<ul>");
 for(int i=0; i<food.length;i++){
 out.println("<li>"+ food[i]);
 }

 out.println("</ul>");
 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 {
 processRequest(request, response);
 }
 /**
 * 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 {
 processRequest(request, response);
 }
 /**
 * 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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