讲解HandlerExecutionChain之前，先大致了解下SpringMVC的核心开发步骤：
在web.xml中部署DispaterServlet，并配置springmvc.xml等文件;
将映射文件请求到处理器HandlerMapping;
HandlerMapping会把请求映射为HandlerExecutionChain类型的handler对象;
将handler对象作为参数传递给HandlerAdapter的实例化对象，调用其handler方法会生成一个ModelAndView对象;
通过ViewResolver视图解析器，将上一步骤中生成的ModelAndView解析为View;
DispatcherServlet根据获取到View，将视图返回给用户。
HandlerExecutionChain类比较简单，好理解。
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HandlerExecutionChain {
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下面是类的部分属性。
List<HandlerInterceptor>
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applyPreHandle(HttpServletRequest request, HttpServletResponse response) = (! ( i = 0; i < interceptors.length; i++= (!interceptor.preHandle(request, response, .interceptorIndex =
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applyPostHandle(HttpServletRequest request, HttpServletResponse response, ModelAndView mv) = (! ( i = interceptors.length - 1; i >= 0; i--=
/** * 这个方法只会执行preHandle()方法已经成功执行并且返回true的拦截器中的postHandle()方法。 */void triggerAfterCompletion(HttpServletRequest request, HttpServletResponse response, Exception ex)throws Exception { HandlerInterceptor[] interceptors = getInterceptors();if (!ObjectUtils.isEmpty(interceptors)) {for (int i = this.interceptorIndex; i >= 0; i--) { HandlerInterceptor interceptor = interceptors[i];try { interceptor.afterCompletion(request, response, this.handler, ex); }catch (Throwable ex2) { logger.error("HandlerInterceptor.afterCompletion threw exception", ex2); } } } }
以上就是对HandlerExecutionChain类的实例讲解的详细内容，更多请关注其它相关文章！
哪怕前方的路会充满坎坷，但为梦想而拼搏的人会永不言败
