Struts运行时候,会执行默认的拦截器栈,其中有一个拦截器,模型驱动拦截器:
<interceptor name="modelDriven" class="com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor"/>
@Override public String intercept(ActionInvocation invocation) throws Exception { Object action = invocation.getAction(); if (action instanceof ModelDriven) { ModelDriven modelDriven = (ModelDriven) action; ValueStack stack = invocation.getStack(); Object model = modelDriven.getModel(); if (model != null) { stack.push(model); } if (refreshModelBeforeResult) { invocation.addPreResultListener(new RefreshModelBeforeResult(modelDriven, model)); } } return invocation.invoke(); }