Java tutorial
/* * 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. */ package com.astech.mnlottery.web; import com.astech.mnlottery.service.model.LotteryGameResponse; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.google.gson.JsonIOException; import com.google.gson.JsonSyntaxException; import com.google.gson.reflect.TypeToken; import com.google.gson.stream.JsonReader; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.lang.reflect.Type; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.util.Collection; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author franzsilv1 */ public class EditGameList 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"); try (PrintWriter out = response.getWriter()) { /* 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 EditGameList</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Servlet EditGameList at " + request.getContextPath() + "</h1>"); out.println("</body>"); out.println("</html>"); } } // <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 { String operation = request.getParameter("operation"); if (operation != null) { int lotteryGameId = Integer.parseInt(request.getParameter("lotteryGameId")); switch (operation) { case "delete": Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd'T'HH:mm:ss").create(); LotteryGameResponse lotGameObj = null; String fetchUrl = "http://localhost:8080/AstonTech.MNLottery.RestService/webresources/lotGame/get/"; fetchUrl = fetchUrl + lotteryGameId; try { URLConnection urlConnection = new URL(fetchUrl).openConnection(); urlConnection.connect(); JsonReader reader = new JsonReader(new InputStreamReader(urlConnection.getInputStream())); gson = new GsonBuilder().create(); Type type = new TypeToken<LotteryGameResponse>() { }.getType(); lotGameObj = gson.fromJson(reader, type); } catch (IOException | JsonIOException | JsonSyntaxException ex) { System.out.println("Exception caught: " + ex); } String jsonGame = gson.toJson(lotGameObj); fetchUrl = "http://localhost:8080/AstonTech.MNLottery.RestService/webresources/lotGame/delete"; try { HttpURLConnection urlConnection = (HttpURLConnection) new URL(fetchUrl).openConnection(); urlConnection.setRequestMethod("POST"); urlConnection.setDoOutput(true); urlConnection.setDoInput(true); urlConnection.addRequestProperty("Content-type", "application/json"); urlConnection.setRequestProperty("Accept", "text/plain"); OutputStreamWriter out = new OutputStreamWriter(urlConnection.getOutputStream()); out.write(jsonGame); out.flush(); BufferedReader reader = new BufferedReader( new InputStreamReader(urlConnection.getInputStream())); String line; while ((line = reader.readLine()) != null) { System.out.println(line); } } catch (Exception ex) { System.out.println("Exception caught: " + ex); } break; default: break; } } request.setAttribute("navBarContent", Builders.buildNavBar(0)); request.setAttribute("homeNavBar", Builders.buildHomeNavBar(4)); Collection<LotteryGameResponse> lotGameCol = null; lotGameCol = Builders.getGameCollection(); request.setAttribute("lotteryGameCol", lotGameCol); request.getRequestDispatcher("./editGameList.jsp").forward(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> }