Beispiel: HTTP-Server auf HttpServlet-Basis

class DefaultServlet

class DefaultServlet extends HttpServlet
{ // Servlet fuer alle Requests, denen kein
  // anderes Servlet zugeordnet ist

 public String getServletInfo()
 {
  return "DefaultServlet/1.0/ServletServer/1.0";
 }

 protected void doGet(HttpServletRequest req, HttpServletResponse res)
  throws ServletException, IOException
 { // fuer GET, HEAD und POST
  try
  {
// die gefragte Datei lesen
   File file = new File(req.getPathTranslated());
   FileInputStream fis = new FileInputStream(
    req.getPathTranslated());
   int length = (int)file.length();
   byte[] data = new byte[length];
   fis.read(data);
   fis.close();
   res.setStatus(200,"OK");
   res.setContentLength(length);
   res.setContentType(req.getContentType());
// geg. Datei senden; getOutputStream() ruft SendHeader auf
   ServletOutputStream os = res.getOutputStream();
   if (! req.getMethod().equals("HEAD"))
    os.write(data);
// Verbindung schliessen
   os.close();
   log(new java.util.Date()+ ", " + req.getPathInfo());
  }
  catch (IOException e)
  {
// Fehlermeldung senden, loggen und Verbindung schliessen
   res.sendError(404,"File Not Found");
   log(new Date() + ", 404 File Not Found"
     + req.getPathTranslated());
   res.getOutputStream().close();
  }
 }
 
 protected void doPost(HttpServletRequest req, HttpServletResponse res)
  throws ServletException, IOException
 { // fuer POST
// restliche Sendung ignorieren
  try
  {
   ServletInputStream is = req.getInputStream();
   is.skip(req.getContentLength());
  }
  catch (IOException e)
  {}
  doGet(req,res);
 }

}