code: protected boolean isExclusion(String matchUrl) throws IOException, ServletException {
      	if (ignorePtn != null && ignorePtn.matcher(matchUrl).find()) {
      		return true;
      	}
      	if (exclusionsSuffix != null) {
      		if (exclusionsSuffix.matcher(matchUrl).find()) {
  	    		return true;
      		}
      	}
      	if (exclusionsPrefix != null) {
      		if (exclusionsPrefix.matcher(matchUrl).find()) {
  	    		return true;
      		}
      	}
      	if (exclusionPaths != null && exclusionPaths.contains(matchUrl)) {
      		return true;
      	}
      	return false;
      }
docs: 过滤请求. 过滤顺序(ignorePtn,exclusionsSuffix,exclusionsPrefix,exclusionPaths)
  @param matchUrl 待匹配URL
  @return 需要排除则返回true
  @throws IOException 不太可能抛出
  @throws ServletException 不太可能抛出