Spring Cloud Feign整合Hystrix

一 会员模块

1 新建控制器

package org.crazyit.cloud;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MemberController {
    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    public String hello() {
        return "hello";
    }
    
}

二 销售模块

1 增加依赖

    org.springframework.cloud
    spring-cloud-starter-hystrix


    org.springframework.cloud
    spring-cloud-starter-feign

2 启动类中增加@EnableFeignClients注解

package org.crazyit.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
@ServletComponentScan
@EnableFeignClients
public class SaleApp {
    
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
    
    public static void main(String[] args) {
        new SpringApplicationBuilder(SaleApp.class).web(true).run(args);
    }

}

3 新建Feign接口

package org.crazyit.cloud.feign;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
//这里说明了回退类是HelloClientFallback
@FeignClient(name = "spring-hy-member", fallback = HelloClientFallback.class)
public interface HelloClient {

    @RequestMapping(method = RequestMethod.GET, value = "/hello")
    public String hello();
}

4 新建控制器

package org.crazyit.cloud.feign;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.hystrix.HystrixCircuitBreaker;
import com.netflix.hystrix.HystrixCommandKey;

@RestController
public class FeignController {
    
    @Autowired
    private HelloClient helloClient;

    @RequestMapping(method = RequestMethod.GET, value = "/hello")
    public String hello() {
        return helloClient.hello();
    }

}

5 新建回退类

package org.crazyit.cloud.feign;
importorg.springframework.stereotype.Component;
@Component
public class HelloClientFallback implements HelloClient {
      public String hello() {
            return "fallback hello";
      }
}

6 不启动会员模块，仅启动销售模块，测试回退逻辑

进入回退逻辑，测试成功！