12、Feign整合断路器Hystrix

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12、Feign整合断路器Hystrix

2023-05-30 15:10| 来源: 网络整理| 查看: 265

公众号： java 乐园

上编说了《RestTemplate+Ribbon整合断路器Hystrix》，这篇来看看如何Feign整合断路器Hystrix，Feign整合断路器Hystrix也是相对比较简单的。Feign默认已经自带断路器Hystrix，所以不需要像RestTemplate+Ribbon整合断路器Hystrix那样需要在SpringBoot的启动类添加注解。但是Feign自带断路器并没有打开，需要做些额外的配置。

feign: hystrix: enabled: true

1、新建项目sc-eureka-client-consumer-feign-hystrix，对应的pom.xml文件如下

4.0.0 spring-cloud sc-eureka-client-consumer-feign 0.0.1-SNAPSHOT jar sc-eureka-client-consumer-feign http://maven.apache.org org.springframework.boot spring-boot-starter-parent 2.0.4.RELEASE org.springframework.cloud spring-cloud-dependencies Finchley.RELEASE pom import UTF-8 1.8 1.8 org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.springframework.boot spring-boot-starter-web org.springframework.cloud spring-cloud-starter-openfeign

备注：从继续关系可以看出spring-cloud-starter-openfeign已经集成断路器Hystrix

12、Feign整合断路器Hystrix_spring

2、新建springboot启动类

package sc.consumer; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.openfeign.EnableFeignClients; @SpringBootApplication @EnableEurekaClient @EnableFeignClients public class ConsumerFeignApplication { public static void main(String[] args) { SpringApplication.run(ConsumerFeignApplication.class, args); } }

3、新建配置文件bootstrap.yml和application.yml bootstrap.yml

server: port: 5800 application.yml spring: application: name: sc-eureka-client-consumer-feign-hystrix eureka: client: registerWithEureka: true #是否将自己注册到Eureka服务中，默认为true fetchRegistry: true #是否从Eureka中获取注册信息，默认为true serviceUrl: defaultZone: http://localhost:5001/eureka/ feign: hystrix: enabled: true

说明：在application.yml配置文件添加了开启断路器Hystrix的配置项

12、Feign整合断路器Hystrix_springboot_02

4、新建服务消费者类UserService.java

package sc.consumer.service; import java.util.Map; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import sc.consumer.model.User; import sc.consumer.service.hystrix.UserServiceHystrix; @FeignClient(value="sc-eureka-client-provider", fallback=UserServiceHystrix.class) public interface UserService { @GetMapping("/user/getUser/{id}") Map getUser(@PathVariable(value ="id") Long id); @RequestMapping("/user/listUser") Map listUser(); @PostMapping("/user/addUser") Map addUser(@RequestBody User user); @PutMapping("/user/updateUser") Map updateUser(@RequestBody User user); @DeleteMapping("/user/deleteUser/{id}") Map deleteUser(@PathVariable(value ="id") Long id); }

可以看到在该类的FeignClient注解上添加了一个属性fallback

12、Feign整合断路器Hystrix_User_03

5、新建断路器处理类UserServiceHystrix.java

package sc.consumer.service.hystrix; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.springframework.stereotype.Component; import sc.consumer.model.User; import sc.consumer.service.UserService; @Component public class UserServiceHystrix implements UserService{ @Override public Map getUser(Long id) { Map result = new HashMap(); result.put("code", "000000"); result.put("msg", "success"); User u = new User(); u.setId(-1L); u.setUserName("failBackName"); result.put("body", u); return result; } @Override public Map listUser() { Map result = new HashMap(); result.put("code", "000000"); result.put("msg", "success"); List list = new ArrayList(); User u = new User(); u.setId(-1L); u.setUserName("failBackName"); list.add(u); result.put("body", list); return result; } @Override public Map addUser(User user) { Map result = new HashMap(); result.put("code", "000000"); result.put("msg", "success"); result.put("body", 0); return result; } @Override public Map updateUser(User user) { Map result = new HashMap(); result.put("code", "000000"); result.put("msg", "success"); result.put("body", 0); return result; } @Override public Map deleteUser(Long id) { Map result = new HashMap(); result.put("code", "000000"); result.put("msg", "success"); result.put("body", 0); return result; } }

该类实现了UserService接口，并实现了该接口的所有方法。

6、分别启动注册中心sc-eureka-server和服务提供者sc-eureka-client-provider

7、启动sc-eureka-client-consumer-feign-hystrix，并验证是否启动成功

方式一：查看日志看看对应的端口是启动

12、Feign整合断路器Hystrix_springboot_04