大概原理：通过反射解析注解 @SentinelResource信息完成调用，处理方法，类似AOP编程

处理方法的返回类型要保持一致，参数和顺序保持一致， 可以在参数列表最后加

com.alibaba.csp.sentinel.slots.block.BlockException;

    /*** 如果不在同类，需要指明类名和方法名并且方法必须是静态方法*/@GetMapping("/add2")@SentinelResource(value = "add", blockHandlerClass = {FlowContrlHandler.class}, blockHandler = "flow")public String add2() {System.out.println("下单成功！开始远程调用库存服务");return stockServiceFeign.reduct();}/*** 如果在同类，只需要指明方法名*/@GetMapping("/flow")@SentinelResource(value = "flow", blockHandler = "flowControlHandler")public String flow() {return "正常访问";}public String flowControlHandler(BlockException e) {return "Sentinel: 请求频繁！请稍后再试！";}

package com.ldj.cloud.order.handler;import com.alibaba.csp.sentinel.slots.block.BlockException;/*** User: ldj* Date: 2024/4/18* Time: 23:51* Description: No Description*/
public class FlowContrlHandler {public static String flow(BlockException e) {return "Sentinel_Static: 请求频繁！请稍后再试！";}
}