HelloWorld


1   package mypackage;
2   
3   import java.io.*;
4   import java.net.*;
5   import java.util.Enumeration  ;
6   
7   import javax.servlet.*;
8   import javax.servlet.http.*;
9   
10  public class HelloWorld extends HttpServlet {
11      
12      /** Initializes the servlet.
13       */
14      public void init(ServletConfig config) throws ServletException {
15          super.init(config);
16          
17      }
18      
19      /** Destroys the servlet.
20       */
21      public void destroy() {
22          
23      }
24      
25      /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
26       * @param request servlet request
27       * @param response servlet response
28       */
29      protected void processRequest(HttpServletRequest request, HttpServletResponse response)
30      throws ServletException, IOException {
31          response.setContentType("text/html");
32          PrintWriter out = response.getWriter();
33          out.println("<html>");
34          out.println("<head>");
35          out.println("<title>Servlet</title>");
36          out.println("</head>");
37          out.println("<body>");
38          out.println("<h1>Hello, World!</h1>");
39      out.println("<table border=\"0\" width=\"100%\">");
40      Enumeration   names = request.getHeaderNames();
41      while (names.hasMoreElements()) {
42          String   name = (String  ) names.nextElement();
43          out.println("<tr>");
44          out.println("  <th align=\"right\">" + name + ":</th>");
45          out.println("  <td>" + request.getHeader(name) + "</td>");
46          out.println("</tr>");
47      }
48      out.println("</table>");
49          out.println("</body>");
50          out.println("</html>");
51          out.close();
52      }
53      
54      /** Handles the HTTP <code>GET</code> method.
55       * @param request servlet request
56       * @param response servlet response
57       */
58      protected void doGet(HttpServletRequest request, HttpServletResponse response)
59      throws ServletException, IOException {
60          processRequest(request, response);
61      }
62      
63      /** Handles the HTTP <code>POST</code> method.
64       * @param request servlet request
65       * @param response servlet response
66       */
67      protected void doPost(HttpServletRequest request, HttpServletResponse response)
68      throws ServletException, IOException {
69          processRequest(request, response);
70      }
71      
72      /** Returns a short description of the servlet.
73       */
74      public String   getServletInfo() {
75          return "Short description";
76      }
77      
78  }
79
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