SpringCloud分布式微服务b2b2c电子商务分布式微服务-docker-feign-hystrix（七）

素颜马尾好姑娘i 2021-05-20 20:36 547阅读 0赞

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）  
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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>
                        
                        <execution>
                            <id>build-image</id>
                            <phase>install</phase>
                            <goals>
                                <goal>build</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        
                        <dockerHost>http://192.168.6.130:5678</dockerHost>
                        <pushImage>true</pushImage>
                        
                        <imageName>${docker.repostory}/${docker.image.prefix}/${project.artifactId}:${project.version}</imageName>
                        
                        <baseImage>java:openjdk-8-jdk-alpine</baseImage>
                        
                        <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: 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);
      }
    }

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