structs与ajax结合的问题

structs2与ajax结合，无论采用$.post还是$.ajax都捕获不到服务器产生的错误，这是structs2内部设计的不是很好,

但是$.ajax捕获错误在servlet能做到。因为

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);//产生错误的模板页面，并返回到客户端

        } catch (Exception e) {

            sendError(request, response, context, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);//产生错误的模板页面，并返回到客户端

        } finally {

            UtilTimerStack.pop(timerKey);

        }

    }

所以所有的struts2的错误都会走该模板页面.