示例#1
0
 @Override
 protected void doHead(HttpServletRequest req, HttpServletResponse resp)
     throws IOException, ServletException {
   try {
     lookup(req).respondHead(resp);
   } catch (UnsupportedOperationException e) {
     super.doHead(req, resp);
   }
 }
示例#2
0
 @Override
 protected void doHead(HttpServletRequest req, HttpServletResponse resp)
     throws ServletException, IOException {
   // Passes HEAD to GET by default
   super.doHead(req, resp);
 }
  /**
   * Receives standard HTTP requests from the public <code>service</code> method and dispatches them
   * to the <code>do</code><i>Method</i> methods defined in this class. This method is an
   * HTTP-specific version of the {@link javax.servlet.Servlet#service} method. There's no need to
   * override this method.
   *
   * @param req the {@link HttpServletRequest} object that contains the request the client made of
   *     the servlet
   * @param resp the {@link HttpServletResponse} object that contains the response the servlet
   *     returns to the client
   * @exception IOException if an input or output error occurs while the servlet is handling the
   *     HTTP request
   * @exception ServletException if the HTTP request cannot be handled
   * @see javax.servlet.Servlet#service
   */
  protected void service(HttpServletRequest req, HttpServletResponse resp)
      throws ServletException, IOException {

    String method = req.getMethod();

    if (method.equals(METHOD_GET)) {
      long lastModified = getLastModified(req);
      if (lastModified == -1) {
        // servlet doesn't support if-modified-since, no reason
        // to go through further expensive logic
        doGet(req, resp);
      } else {
        long ifModifiedSince;
        try {
          ifModifiedSince = req.getDateHeader(HEADER_IFMODSINCE);
        } catch (IllegalArgumentException iae) {
          // Invalid date header - proceed as if none was set
          ifModifiedSince = -1;
        }
        if (ifModifiedSince < (lastModified / 1000 * 1000)) {
          // If the servlet mod time is later, call doGet()
          // Round down to the nearest second for a proper compare
          // A ifModifiedSince of -1 will always be less
          maybeSetLastModified(resp, lastModified);
          doGet(req, resp);
        } else {
          resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
        }
      }

    } else if (method.equals(METHOD_HEAD)) {
      long lastModified = getLastModified(req);
      maybeSetLastModified(resp, lastModified);
      doHead(req, resp);

    } else if (method.equals(METHOD_POST)) {
      doPost(req, resp);

    } else if (method.equals(METHOD_PUT)) {
      doPut(req, resp);

    } else if (method.equals(METHOD_DELETE)) {
      doDelete(req, resp);

    } else if (method.equals(METHOD_OPTIONS)) {
      doOptions(req, resp);

    } else if (method.equals(METHOD_TRACE)) {
      doTrace(req, resp);

    } else {
      //
      // Note that this means NO servlet supports whatever
      // method was requested, anywhere on this server.
      //

      String errMsg = lStrings.getString("http.method_not_implemented");
      Object[] errArgs = new Object[1];
      errArgs[0] = method;
      errMsg = MessageFormat.format(errMsg, errArgs);

      resp.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED, errMsg);
    }
  }