Mr.zZ

Feign

就是使得后端调用http请求像调用本地方法一下简单明了。内部集成了Ribbon和Hystrix。

引入依赖包

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

在spring boot启动类上加上EnableFeignClients注解。

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

设置需要调用的FeignClient和失败后的Fallback

//feignclient
@FeignClient(name = "comsumer-client",fallback = FeignServiceImp.class)
public interface FeignService {

    @GetMapping("/consumer")
    public String printConsumer();
}
//fallback
@Service
public class FeignServiceImp implements FeignService{
    @Override
    public String printConsumer() {
        return "调用失败";
    }
}

使用feignClient调用

@Autowired
private FeignService feignService;

@GetMapping("/")
public String feign(){
    ServiceInstance serviceInstance = discoveryClient.getLocalServiceInstance();
    return serviceInstance.getServiceId()+"("+serviceInstance.getHost()+":"+serviceInstance.getPort()+")"+"===>Say feign"+"<br>"+feignService.printConsumer();
}