公众号: java乐园
成都创新互联公司专注于企业全网营销推广、网站重做改版、富顺网站定制设计、自适应品牌网站建设、HTML5、成都商城网站开发、集团公司官网建设、成都外贸网站制作、高端网站制作、响应式网页设计等建站业务,价格优惠性价比高,为富顺等各大城市提供网站开发制作服务。
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
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
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
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
方式二:查看注册中心是否注册成功
8、 使用postman验证断路器是否启用
上篇从服务提供者是否正常启动验证断路器是否启动,今天看看从数据库是否启动来验证断路器是否启动
(1)MySQL服务正常启动时访问:
http://127.0.0.1:5800/feign/user/listUser
(2)MySQL服务关闭时访问
http://127.0.0.1:5800/feign/user/listUser
再看下后台日志:
其他接口可以自行按照以上方式进行验证,看看断路器是否启动
源码 https://gitee.com/hjj520/spring-cloud-2.x