上一节我们讨论feign的配置，这节我们讨论一下，feign+hystrix调用生产者时，进行容错处理。
一、创建模块（microservice-consumer-movie-feign-with-hystrix）

二、pom.xml文件

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">;

microservice-spring-cloud
com.jacky
1.0-SNAPSHOT

4.0.0

microservice-consumer-movie-feign-with-hystrix
jar


    UTF-8
    UTF-8
    1.8



    
        org.springframework.boot
        spring-boot-starter-web
    

    
        org.springframework.cloud
        spring-cloud-starter-eureka
    

    
        org.springframework.boot
        spring-boot-starter-actuator
    

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

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


    
        
            com.spotify
            docker-maven-plugin
            
                
                
                    build-image
                    install
                    
                        build
                    
                
            
            
                
                http://192.168.6.130:5678
                true
                
                ${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}
                
                java:openjdk-8-jdk-alpine
                
                ["java", "-jar", "/${project.build.finalName}.jar"]
                
                    
                        /
                        ${project.build.directory}
                        ${project.build.finalName}.jar

三、配置文件application.yml

spring:
  application:
    name: microservice-consumer-movie-feign-with-hystrix
server:
  port: 7901
eureka:
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone: http://jacky:admin@peer1:8761/eureka/,http://jacky:admin@peer2:8762/eureka/,http://jacky:admin@peer3:8763/eureka/
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}

四、实体类User.java

package com.jacky.cloud.entity;

import java.math.BigDecimal;

public class User {
  private Long id;

  private String username;

  private String name;

  private Short age;

  private BigDecimal balance;

  public Long getId() {
    return this.id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return this.username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Short getAge() {
    return this.age;
  }

  public void setAge(Short age) {
    this.age = age;
  }

  public BigDecimal getBalance() {
    return this.balance;
  }

  public void setBalance(BigDecimal balance) {
    this.balance = balance;
  }

}

五、生产者发生错误时使用的类（HystrixClientFallback.java）了解springcloud架构可以加求求：三五三六二四七二五九

package com.jacky.cloud.feign;

import org.springframework.stereotype.Component;

import com.jacky.cloud.entity.User;

@Component
public class HystrixClientFallback implements UserFeignClient {

  @Override
  public User findById(Long id) {
    User user = new User();
    user.setId(0L);
    return user;
   }
}

六、feign客户端UserFeignClient.java

package com.jacky.cloud.feign;

import com.jacky.cloud.entity.User;
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;

@FeignClient(name = "microservice-provider-user", fallback = HystrixClientFallback.class)
public interface UserFeignClient {
  @RequestMapping(value = "/simple/{id}", method = RequestMethod.GET)
  public User findById(@PathVariable("id") Long id);
}

七、MovieController.java

package com.jacky.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.jacky.cloud.entity.User;
import com.jacky.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);
  }
}

八、启动类

package com.jacky.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

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