简介

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

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"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"><parent><artifactId>microservice-spring-cloud</artifactId><groupId>com.jacky</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>microservice-consumer-movie-feign-with-hystrix</artifactId><packaging>jar</packaging><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-feign</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix</artifactId></dependency></dependencies><build><plugins><plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><executions><!--设置在执行maven 的install时构建镜像--><execution><id>build-image</id><phase>install</phase><goals><goal>build</goal></goals></execution></executions><configuration><!--安装了docker的主机，并且打开了api remote接口设置--><dockerHost>http://192.168.6.130:5678</dockerHost><pushImage>true</pushImage><!--设置上传镜像到私有仓库，需要docker设置指定私有仓库地址--><!--镜像名称--><imageName>${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}</imageName><!--镜像的基础版本--><baseImage>java:openjdk-8-jdk-alpine</baseImage><!--镜像启动参数--><entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint><resources><resource><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resource></resources></configuration></plugin></plugins></build>
</project>

三、配置文件application.yml

spring:application:name: microservice-consumer-movie-feign-with-hystrix
server:port: 7901
eureka:client:healthcheck:enabled: trueserviceUrl:defaultZone: http://jacky:admin@peer1:8761/eureka/,http://jacky:admin@peer2:8762/eureka/,http://jacky:admin@peer3:8763/eureka/instance:prefer-ip-address: trueinstance-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）

package com.jacky.cloud.feign;import org.springframework.stereotype.Component;import com.jacky.cloud.entity.User;@Component
public class HystrixClientFallback implements UserFeignClient {@Overridepublic 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 {@Autowiredprivate 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);}
}

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