コード例 #1
0
  /**
   *
   * <li>forceLookup 为false时,优先返回(ActionMapping) request.getAttribute(STRUTS_ACTION_MAPPING_KEY)
   * <li>forceLookup 为true时,每次都去获取ActionMapper实例 <br>
   *     <br>
   *     Finds and optionally creates an {@link ActionMapping}. if forceLookup is false, it first
   *     looks in the current request to see if one has already been found, otherwise, it creates it
   *     and stores it in the request. No mapping will be created in the case of static resource
   *     requests or unidentifiable requests for other servlets, for example.
   *
   * @param forceLookup if true, the action mapping will be looked up from the ActionMapper
   *     instance, ignoring if there is one in the request or not
   */
  public ActionMapping findActionMapping(
      HttpServletRequest request, HttpServletResponse response, boolean forceLookup) {
    ActionMapping mapping = (ActionMapping) request.getAttribute(STRUTS_ACTION_MAPPING_KEY);
    if (mapping == null || forceLookup) {
      try {
        // ActionMapper默认实例是{ @link org.apache.struts2.dispatcher.mapper.DefaultActionMapper}
        mapping =
            dispatcher
                .getContainer()
                .getInstance(ActionMapper.class)
                .getMapping(request, dispatcher.getConfigurationManager());
        if (mapping != null) {
          // 设置mapping到request属性,
          request.setAttribute(STRUTS_ACTION_MAPPING_KEY, mapping);
        }
      } catch (Exception ex) {
        dispatcher.sendError(
            request, response, servletContext, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex);
      }
    }

    return mapping;
  }
コード例 #2
0
ファイル: Dispatcher.java プロジェクト: faithyee/Struts2
  /**
   * Load Action class for mapping and invoke the appropriate Action method, or go directly to the
   * Result.
   *
   * <p>This method first creates the action context from the given parameters, and then loads an
   * <tt>ActionProxy</tt> from the given action name and namespace. After that, the Action method is
   * executed and output channels through the response object. Actions not found are sent back to
   * the user via the {@link Dispatcher#sendError} method, using the 404 return code. All other
   * errors are reported by throwing a ServletException.
   *
   * @param request the HttpServletRequest object
   * @param response the HttpServletResponse object
   * @param mapping the action mapping object
   * @throws ServletException when an unknown error occurs (not a 404, but typically something that
   *     would end up as a 5xx by the servlet container)
   * @param context Our ServletContext object
   */
  public void serviceAction(
      HttpServletRequest request,
      HttpServletResponse response,
      ServletContext context,
      ActionMapping mapping)
      throws ServletException {

    Map<String, Object> extraContext = createContextMap(request, response, mapping, context);

    // If there was a previous value stack, then create a new copy and pass it in to be used by the
    // new Action
    ValueStack stack =
        (ValueStack) request.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
    boolean nullStack = stack == null;
    if (nullStack) {
      ActionContext ctx = ActionContext.getContext();
      if (ctx != null) {
        stack = ctx.getValueStack();
      }
    }
    if (stack != null) {
      extraContext.put(ActionContext.VALUE_STACK, valueStackFactory.createValueStack(stack));
    }

    String timerKey = "Handling request from Dispatcher";
    try {
      UtilTimerStack.push(timerKey);
      String namespace = mapping.getNamespace();
      String name = mapping.getName();
      String method = mapping.getMethod();

      Configuration config = configurationManager.getConfiguration();
      ActionProxy proxy =
          config
              .getContainer()
              .getInstance(ActionProxyFactory.class)
              .createActionProxy(namespace, name, method, extraContext, true, false);

      request.setAttribute(
          ServletActionContext.STRUTS_VALUESTACK_KEY, proxy.getInvocation().getStack());

      // if the ActionMapping says to go straight to a result, do it!
      if (mapping.getResult() != null) {
        Result result = mapping.getResult();
        result.execute(proxy.getInvocation());
      } else {
        proxy.execute();
      }

      // If there was a previous value stack then set it back onto the request
      if (!nullStack) {
        request.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
      }
    } catch (ConfigurationException e) {
      // WW-2874 Only log error if in devMode
      if (devMode) {
        String reqStr = request.getRequestURI();
        if (request.getQueryString() != null) {
          reqStr = reqStr + "?" + request.getQueryString();
        }
        LOG.error("Could not find action or result\n" + reqStr, e);
      } else {
        if (LOG.isWarnEnabled()) {
          LOG.warn("Could not find action or result", e);
        }
      }
      sendError(request, response, context, HttpServletResponse.SC_NOT_FOUND, e);
    } catch (Exception e) {
      if (handleException || devMode) {
        sendError(request, response, context, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
      } else {
        throw new ServletException(e);
      }
    } finally {
      UtilTimerStack.pop(timerKey);
    }
  }