springcloud之Hystrix初识篇—结合Feign使用简例

本是古典何须时尚 2023-07-19 04:54 46阅读 0赞

1、添加pom依赖(使用Hoxton.SR3版本feign中没有自动依赖Hystrix,需要我们手动添加)

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>

2、yml中feign启动hystrix组件

feign:
      hystrix:
        enabled: true

3、启动类添加注解

@SpringBootApplication
    @EnableFeignClients
    @EnableHystrix
    public class RibbonFeignApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(RibbonFeignApplication.class, args);
        }
    
    }

4、编写fallback(降级)方法类

package com.example.springcloud.ribbonfeign.fallback;
    
    import com.example.springcloud.ribbonfeign.service.FeignTest1Service;
    import org.springframework.stereotype.Component;
    
    import java.util.Map;
    
    /**
     * FeignTest1Service：feign调用提供者的接口
     * Created by py
     * 2020/3/25
     */
    @Component  //PS:必须把该类作为组件放到容器中，不然熔断降级不生效
    public class FeignTest1ServiceFallBack implements FeignTest1Service {
        @Override
        public String testFeign(Map<String, String> map) {
            return "哎呀，熔断了";
        }
    }

5、feign接口添加配置参数

@FeignClient(name = "test1",path ="eureka-clinet1",fallback = FeignTest1ServiceFallBack.class)
    public interface FeignTest1Service {
    
        @RequestMapping(value = "/ribbonTest",method = RequestMethod.POST)
        public String testFeign(@RequestBody Map<String,String> map);
    }

6、controller调用

@RestController
    public class SingleFeignController {
    
        @Autowired
        private FeignTest1Service feignTest1Service;
    
        @RequestMapping("/singleFeign")
        public String singleFeign(){
            Map<String,String> map = new HashMap<String,String>(){
       {
                put("name","ribboon-openFeign");
            }};
            String result = feignTest1Service.testFeign(map);
            return result;
        }
    }

停掉提供者服务，进行请求：

![20200329181359264.png][]

[20200329181359264.png]: /images/20230528/51b000be5b0d4601b2647201d391073c.png