SpringCloud之Feign路由、负载和熔断

application.yml

server:
  port: 8094

spring:
  application:
    name: feign-ha

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8088/eureka/
#启用熔断机制
feign:
  hystrix:
    enabled: true

启动类

@EnableFeignClients
@EnableEurekaClient
@SpringBootApplication
public class FeignHaApplication {
	...
}

Controller

@RestController
public class HaController {

    @Resource
    private HaFeign haFeign;

    @Value("${server.port}")
    private String port;

    @GetMapping("hello")
    public String hello(@RequestParam String name) {
        return "ha，" + name + " ! " + "访问端口号：" + port;
    }

    @GetMapping("ha")
    public String ha(@RequestParam String name) {
        return haFeign.callHi(name);
    }

}

Service

// 请求转发到 feign-hi 服务，服务不可达时，回调Haback
@FeignClient(value = "feign-hi", fallback = HaBack.class)
public interface HaFeign {

    @GetMapping("hello")
    String callHi(@RequestParam String name);
}

@Service
public class HaBack implements HaFeign {
    @Override
    public String callHi(String name) {
        return "feign-hi 服务挂了";
    }
}

application.yml

server:
  port: 8095

spring:
  application:
    name: feign-hi

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8088/eureka/

feign:
  hystrix:
    enabled: true

启动类

@EnableFeignClients
@EnableEurekaClient
@SpringBootApplication
public class FeignHiApplication {
	...
}

Controller

@RestController
public class HiController {

    @Resource
    private HiFeign hiFeign;

    @Value("${server.port}")
    private String port;

    @GetMapping("hello")
    public String hello(@RequestParam String name) {
        return "hi，" + name + " ! " + "访问端口号：" + port;
    }

    @GetMapping("hi")
    public String hi(@RequestParam String name) {
        return hiFeign.callHa(name);
    }

}

Service

@FeignClient(value = "feign-ha", fallback = HiBack.class)
public interface HiFeign {

    @GetMapping("hello")
    String callHa(@RequestParam String name);
}

@Service
public class HiBack implements HiFeign {
    @Override
    public String callHa(String name) {
        return "feign-ha 服务挂了";
    }
}

依次启动eureka、feign-ha、feign-hi
访问 http://localhost:8095/hi?name=yzm

转发成功！

启动feign-hi:18095服务
刷新 http://localhost:8094/ha?name=yzm


负载成功！

关闭feign-ha:8094服务
访问 http://localhost:8095/hi?name=yzm

熔断成功！

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