对handlerexecutionchain类的深入理解

HandlerExecutionChain类比较简单，好理解。

public class HandlerExecutionChain {

下面是类的部分属性。

private final Object handler; //处理器对象。

  private HandlerInterceptor[] interceptors; //拦截器数组

  private List interceptorList; //拦截器列表

  boolean applyPreHandle(HttpServletRequest request, HttpServletResponse response) throws Exception {
    HandlerInterceptor[] interceptors = getInterceptors();
    if (!ObjectUtils.isEmpty(interceptors)) {
      for (int i = 0; i < interceptors.length; i++) {
 HandlerInterceptor interceptor = interceptors[i];
 if (!interceptor.preHandle(request, response, this.handler)) {
   triggerAfterCompletion(request, response, null);
   return false;
 }
 this.interceptorIndex = i;
      }
    }
    return true;
  }

  void applyPostHandle(HttpServletRequest request, HttpServletResponse response, ModelAndView mv) throws Exception {
    HandlerInterceptor[] interceptors = getInterceptors();
    if (!ObjectUtils.isEmpty(interceptors)) {
      for (int i = interceptors.length - 1; i >= 0; i--) {
 HandlerInterceptor interceptor = interceptors[i];
 interceptor.postHandle(request, response, this.handler, mv);
      }
    }
  }

  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);
 }
      }
    }
  }

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