Fegion也支持Hystrix。当服务提供者出现异常的时候，使用Hystrix回调方法。
在前面文章中提到的microservice-comsumer-movie-feign的基础上进行修改，主要是有一个回调的方法。
启动类：
package com.dynamic.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class ComsumerMovieFeignApplication {
public static void main(String[] args) {
SpringApplication.run(ComsumerMovieFeignApplication.class, args);
}
}
Controller
package com.dynamic.cloud.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import com.dynamic.cloud.entity.User;
import com.dynamic.cloud.feign.UserFeignClient;
@RestController
public class MovieController {
@Autowired
private UserFeignClient userFeignClient;
@GetMapping("/movie/{id}")
public User findById(@PathVariable Long id)
{
return this.userFeignClient.findById(id);
}
}
package com.dynamic.cloud.feign;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.dynamic.cloud.entity.User;
@FeignClient(name="microservice-provider-user",fallback =HystrixClientFallback.class)
public interface UserFeignClient {
@RequestMapping(value="/simple/{id}",method = RequestMethod.GET) //只能是RequestMapping
public User findById(@PathVariable("id") Long id); //@PathVariable需要设置括号中的名称
}
@FeignClient，要用name 和 fallback
HystrixClientFallback要实现UserFeignClient，并且加入到容器中。
package com.dynamic.cloud.feign;
import org.springframework.stereotype.Component;
import com.dynamic.cloud.entity.User;
@Component
public class HystrixClientFallback implements UserFeignClient {
@Override
public User findById(Long id) {
User user = new User();
user.setId(0L);
return user;
}
}
启动Eureka，用户微服务和修改后的电影微服务。正常情况下，电影微服务调用用户微服务显示数据，当用户微服务出现异常时。电影微服务执行回调方法。
