spring中Dispatchservlet中doDispath方法分析
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Spring中为什么拦截器总是最先执行?
源码分析:
protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
HttpServletRequest processedRequest = request;
HandlerExecutionChain mappedHandler = null;
int interceptorIndex = -1;
ModelAndView mv;
boolean errorView = false;
//根据request获取HanderExecuttionChain
mappedHandler = getHandler(processedRequest);
//根据Handler获取HandlerAdpter
HandlerAdapter ha = getHandlerAdapter(mappedHandler.getHandler());
HandlerInterceptor[] interceptors = mappedHandler.getInterceptors();
if (interceptors != null) {
for (int i = 0; i < interceptors.length; i++) {
HandlerInterceptor interceptor = interceptors[i];
//调用interceptor的preHandler
if (!interceptor.preHandle(processedRequest, response, mappedHandler.getHandler())) {
return;
}
interceptorIndex = i;
}
}
//调用HandlerAdapter的handler处理
mv =ha.handle(processedRequest, response, mappedHandler.getHandler());
。。。。。。
//设置视图
if (mv != null && !mv.hasView()) {
mv.setViewName(getDefaultViewName(request));
}
if (interceptors != null) {
for (int i = interceptors.length - 1; i >= 0; i--) {
HandlerInterceptor interceptor = interceptors[i];
//调用interceptor的postHandle
interceptor.postHandle(processedRequest, response, mappedHandler.getHandler(), mv);
}
}
//渲染视图
render(mv, processedRequest, response);
//调用Interceptor的afterCompletion方法
triggerAfterCompletion(mappedHandler, interceptorIndex, processedRequest, response, null);
}
private void triggerAfterCompletion(HandlerExecutionChain mappedHandler,int interceptorIndex,
HttpServletRequest request,HttpServletResponse response,Exception ex) throws Exception {
if (mappedHandler != null) {
HandlerInterceptor[] interceptors = mappedHandler.getInterceptors();
if (interceptors != null) {
for (int i = interceptorIndex; i >= 0; i--) {
HandlerInterceptor interceptor = interceptors[i];
interceptor.afterCompletion(request, response, mappedHandler.getHandler(), ex);
}
}
}
}
从上面分析可知hanlder的调用是在所有的拦截器preHandler方法返回true
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