14、openFeign整合sentinel

第一步：创建项目

从 2、Spring Cloud Alibaba快速整合OpenFeign复制order-openfeign，修改为order-openfeign-sentinel

order-openfeign-sentinel模块

第一步：修改application.yml

server:
  port: 8086
#应用名称（nacos会将该名称当做服务名称）
spring:
  application:
    name: order-service
  cloud:
    nacos:
      server-addr: 127.0.0.1:8848
      discovery:
        username: nacos
        password: nacos
        namespace: public

第二步：添加依赖

 <!--sentinel依赖-->
 <dependency>
       <groupId>com.alibaba.cloud</groupId>
       <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
   </dependency>

第三步：创建StockFeignServiceFallback

package com.example.order.feign;

import org.springframework.stereotype.Component;

@Component
public class StockFeignServiceFallback implements StockFeignService {
    public String reduck2() {
        return "降级啦！！！";
    }
}

第四步：修改application.yml

server:
  port: 8089
#应用名称（nacos会将该名称当做服务名称）
spring:
  application:
    name: order-service
  cloud:
    nacos:
      server-addr: 127.0.0.1:8848
      discovery:
        username: nacos
        password: nacos
        namespace: public
feign:
  sentinel:
    # openFeign整合sentinel
    enabled: true

第五步：修改StockFeignService

package com.example.order.feign;

import com.example.order.config.FeignConfig;
import feign.RequestLine;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * name指定调用rest接口欧所对应的服务名，被调用服务的应用名
 * path指定调用rest接口所在的StockController指定的@RequestMapping
 */
@FeignClient(name = "stock-service",path = "/stock",fallback = StockFeignServiceFallback.class)
public interface StockFeignService {

    @RequestMapping("/reduck2")
    String reduck2();
}

stock-nacos模块

第一步：修改StockController

    @RequestMapping("/reduck2")
    public String reduck2() {
        int a = 1/0;
        System.out.println("扣减库存");
        return "扣减库存" + port;
    }

启动stock-service和order-openfeign-sentinel模块