1 | package cz.frantovo.sql.vyuka.ajax; |
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2 | |
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3 | import java.io.IOException; |
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4 | import java.io.PrintWriter; |
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5 | import javax.servlet.ServletException; |
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6 | import javax.servlet.http.HttpServlet; |
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7 | import javax.servlet.http.HttpServletRequest; |
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8 | import javax.servlet.http.HttpServletResponse; |
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9 | |
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10 | /** |
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11 | * Servlet pro vyřizování AJAXových požadavků. |
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12 | * @author fiki |
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13 | */ |
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14 | public class Servlet extends HttpServlet { |
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15 | |
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16 | private static final long serialVersionUID = 9102108273105288056L; |
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17 | |
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18 | private enum akce { |
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19 | |
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20 | /** Provede SQL dotaz. */ |
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21 | vykonat, |
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22 | /** Vypíše historii SQL příkazů daného uživatele. */ |
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23 | historie, |
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24 | /** Vypíše nějaké nepotřebné informace. */ |
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25 | test, |
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26 | /** Pokud je požadovaná akce nesmysl. */ |
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27 | chyba |
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28 | } |
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29 | |
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30 | /** |
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31 | * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. |
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32 | * @param request servlet request |
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33 | * @param response servlet response |
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34 | * @throws ServletException if a servlet-specific error occurs |
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35 | * @throws IOException if an I/O error occurs |
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36 | */ |
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37 | protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { |
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38 | |
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39 | /** Používáme pouze UTF-8 */ |
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40 | response.setContentType("text/html;charset=UTF-8"); |
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41 | request.setCharacterEncoding("UTF-8"); |
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42 | |
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43 | PrintWriter out = response.getWriter(); |
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44 | |
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45 | try { |
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46 | |
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47 | akce parametrAkce = akce.chyba; |
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48 | try { |
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49 | parametrAkce = akce.valueOf(request.getParameter("akce")); |
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50 | } catch (Exception e) { |
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51 | /** Chyba nebo podvržený AJAXový požadavek → zobrazíme chybovou hlášku */ |
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52 | } |
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53 | |
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54 | Ajax a = new Ajax(); |
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55 | |
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56 | |
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57 | switch (parametrAkce) { |
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58 | case vykonat: |
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59 | out.println(a.geSQLVysledek(request.getParameter("sql"))); |
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60 | break; |
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61 | case historie: |
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62 | out.println(a.geSQLVysledek(request.getRequestedSessionId())); |
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63 | break; |
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64 | case test: |
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65 | out.println("<p>AJAX jede!</p>"); |
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66 | out.println("<ol>"); |
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67 | out.println("<li>Metoda: " + request.getMethod() + "</li>"); |
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68 | out.println("<li>Host: " + request.getRemoteHost() + "</li>"); |
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69 | out.println("<li>Adresa: " + request.getRemoteAddr() + "</li>"); |
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70 | out.println("<li>Akce: " + request.getParameter("akce") + "</li>"); |
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71 | out.println("<li>SQL: " + request.getParameter("sql") + "</li>"); |
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72 | out.println("<li>Sezení: " + request.getRequestedSessionId() + "</li>"); |
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73 | out.println("<li>URL: " + request.getRequestURL().toString() + "</li>"); |
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74 | out.println("</ol>"); |
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75 | break; |
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76 | case chyba: |
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77 | out.println("<p>chyba</p>"); |
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78 | break; |
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79 | } |
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80 | } finally { |
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81 | out.close(); |
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82 | } |
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83 | } |
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84 | |
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85 | // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> |
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86 | /** |
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87 | * Handles the HTTP <code>GET</code> method. |
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88 | * @param request servlet request |
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89 | * @param response servlet response |
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90 | * @throws ServletException if a servlet-specific error occurs |
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91 | * @throws IOException if an I/O error occurs |
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92 | */ |
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93 | @Override |
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94 | protected void doGet(HttpServletRequest request, HttpServletResponse response) |
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95 | throws ServletException, IOException { |
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96 | processRequest(request, response); |
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97 | } |
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98 | |
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99 | /** |
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100 | * Handles the HTTP <code>POST</code> method. |
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101 | * @param request servlet request |
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102 | * @param response servlet response |
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103 | * @throws ServletException if a servlet-specific error occurs |
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104 | * @throws IOException if an I/O error occurs |
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105 | */ |
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106 | @Override |
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107 | protected void doPost(HttpServletRequest request, HttpServletResponse response) |
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108 | throws ServletException, IOException { |
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109 | processRequest(request, response); |
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110 | } |
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111 | |
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112 | /** |
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113 | * Returns a short description of the servlet. |
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114 | * @return a String containing servlet description |
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115 | */ |
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116 | @Override |
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117 | public String getServletInfo() { |
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118 | return "Servlet pro zpracování AJAXových požadavků."; |
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119 | }// </editor-fold> |
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120 | } |
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