structs2与ajax结合的经验

　　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 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();