Už to „něco“ dělá – zobrazujeme ukázková data.
1 package cz.frantovo.sql.vyuka.ajax;
3 import cz.frantovo.sql.vyuka.dto.Uzivatel;
4 import java.io.IOException;
5 import java.io.PrintWriter;
6 import javax.servlet.ServletException;
7 import javax.servlet.http.HttpServlet;
8 import javax.servlet.http.HttpServletRequest;
9 import javax.servlet.http.HttpServletResponse;
12 * Servlet pro vyřizování AJAXových požadavků.
15 public class Servlet extends HttpServlet {
17 private static final long serialVersionUID = 9102108273105288056L;
21 /** Provede SQL dotaz. */
23 /** Vypíše historii SQL příkazů daného uživatele. */
25 /** Vypíše nějaké nepotřebné informace. */
27 /** Pokud je požadovaná akce nesmysl. */
32 * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
33 * @param request servlet request
34 * @param response servlet response
35 * @throws ServletException if a servlet-specific error occurs
36 * @throws IOException if an I/O error occurs
38 protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
40 /** Používáme pouze UTF-8 */
41 response.setContentType("text/html;charset=UTF-8");
42 request.setCharacterEncoding("UTF-8");
44 PrintWriter out = response.getWriter();
48 akce parametrAkce = akce.chyba;
50 parametrAkce = akce.valueOf(request.getParameter("akce"));
51 } catch (Exception e) {
52 /** Chyba nebo podvržený AJAXový požadavek → zobrazíme chybovou hlášku */
58 Uzivatel uzivatel = new Uzivatel(request.getRequestedSessionId(), request.getRemoteHost());
60 switch (parametrAkce) {
62 out.println(a.geSQLVysledek(request.getParameter("sql"), uzivatel));
65 out.println(a.getHistorie(uzivatel));
68 out.println("<p>AJAX jede!</p>");
70 out.println("<li>Metoda: " + request.getMethod() + "</li>");
71 out.println("<li>Host: " + request.getRemoteHost() + "</li>");
72 out.println("<li>Adresa: " + request.getRemoteAddr() + "</li>");
73 out.println("<li>Akce: " + request.getParameter("akce") + "</li>");
74 out.println("<li>SQL: " + request.getParameter("sql") + "</li>");
75 out.println("<li>Sezení: " + request.getRequestedSessionId() + "</li>");
76 out.println("<li>URL: " + request.getRequestURL().toString() + "</li>");
80 out.println("<p>chyba</p>");
88 // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
90 * Handles the HTTP <code>GET</code> method.
91 * @param request servlet request
92 * @param response servlet response
93 * @throws ServletException if a servlet-specific error occurs
94 * @throws IOException if an I/O error occurs
97 protected void doGet(HttpServletRequest request, HttpServletResponse response)
98 throws ServletException, IOException {
99 processRequest(request, response);
103 * Handles the HTTP <code>POST</code> method.
104 * @param request servlet request
105 * @param response servlet response
106 * @throws ServletException if a servlet-specific error occurs
107 * @throws IOException if an I/O error occurs
110 protected void doPost(HttpServletRequest request, HttpServletResponse response)
111 throws ServletException, IOException {
112 processRequest(request, response);
116 * Returns a short description of the servlet.
117 * @return a String containing servlet description
120 public String getServletInfo() {
121 return "Servlet pro zpracování AJAXových požadavků.";