1. 博客

      1. https://blog.csdn.net/weixin_60590058/article/details/120991935?spm=1001.2101.3001.6650.2&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-2-120991935-blog-123338658.pc_relevant_antiscanv2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-2-120991935-blog-123338658.pc_relevant_antiscanv2&utm_relevant_index=5
      1. https://blog.csdn.net/m0_45406092/article/details/120396936?spm=1001.2101.3001.6650.12&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-12-120396936-blog-123338658.pc_relevant_antiscanv2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-12-120396936-blog-123338658.pc_relevant_antiscanv2&utm_relevant_index=16
      1. https://blog.csdn.net/m0_45406092/article/details/123338658

    2. 上述的限流也可以使用如下方法 ```java @Configuration public class FilterConfig {

      @Bean public FilterRegistrationBean sentinelFilterRegistration() {

      1.  FilterRegistrationBean<Filter> registration = new FilterRegistrationBean<>();
      2.  registration.setFilter(new CommonFilter());
      3.  registration.addUrlPatterns("/*");
      4.  registration.setName("sentinelFilter");
      5.  registration.setOrder(1);
      6.  return registration;

      }

    }

    1. ```java
    4. @Configuration
    5. @Log4j2
    6. public class SentinelConfiguration {
    8.     @PostConstruct
    9.     public void init() {
    10.         // 统一返回限流或降级响应内容
    11.         WebCallbackManager.setUrlBlockHandler((request, response, ex) -> {
    12.             if (ex instanceof FlowException) {
    13.                 log.info("触发限流 > 请求url:{} > 请求参数:{}", request.getRequestURI(), request.getParameterMap());
    14.             } else if (ex instanceof DegradeException) {
    15.                 log.info("触发熔断 > 请求url:{} > 请求参数:{}", request.getRequestURI(), request.getParameterMap());
    16.             }
    17.             returnData(response, CrowdCode.STATUS_429);
    18.         });
    19.     }
    21.     /**
    22.     * 返回数据结果
    23.     *
    24.     * @param httpResponse
    25.     * @param code:提示信息
    26.     * @return
    27.     */
    28.     private void returnData(HttpServletResponse httpResponse, CrowdCode code) {
    29.         try {
    30.             ResponseEntity responseEntity = new ResponseEntity();
    31.             responseEntity.error(code);
    32.             httpResponse.setCharacterEncoding("UTF-8");
    33.             httpResponse.setContentType("application/json; charset=utf-8");
    34.             httpResponse.setDateHeader("Expires", 0);
    35.             PrintWriter out = httpResponse.getWriter();
    36.             out.print(JSONObject.toJSONString(responseEntity));
    37.             out.flush();
    38.         } catch (Exception e) {
    39.             log.error("响应内容写入失败，系统异常", e);
    40.             System.exit(1);
    41.         }
    42.     }
    43. }