Ribbon实现Eureka负载均衡_erekua-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_43783537/article/details/121339484

配置Eureka见Eureka Server配置_JiuXu九旭的博客-优快云博客

配置Ribbon

提供者配置

1.pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <artifactId>provider-user</artifactId>

    <parent>
        <groupId>com.dxy.springCloud</groupId>
        <artifactId>springCloudDocker</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

</project>

2.yml

server:
  port: 8080
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/demo?serverTimezone=UTC&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&characterEncoding=UTF-8
    username: root
    password: root
  jpa:
    database: mysql
    show-sql: true
  application:
    name: eureka-provider
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true

3.启动类

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

4.entity

@Entity
@Data
@ToString
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @Column
    private String name;
    @Column
    private Integer age;
    @Column
    private String email;
    @Column
    private String username;
    @Column
    private String password;
}

5.dao

@Repository
public interface UserDao extends JpaRepository<User,Long> {
}

6.controller

@RestController
public class UserContorller {
    @Autowired
    private UserDao userDao;

    @GetMapping("/{id}")
    public Optional<User> findById(@PathVariable Long id){
        Optional<User> findOne = this.userDao.findById(id);
        return findOne;
    }
}

消费者配置

1.配置pom

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <artifactId>consumer-user-ribbon</artifactId>

    <parent>
        <artifactId>springCloudDocker</artifactId>
        <groupId>com.dxy.springCloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>
        <!-- 负载均衡 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

</project>

2.配置yml

server:
  port: 8081
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/demo?serverTimezone=UTC&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&characterEncoding=UTF-8
    username: root
    password: root
  jpa:
    database: mysql
    show-sql: true
  application:
    name: eureka-consumer
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true

3.entity

@Data
@ToString
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
    private String username;
    private String password;
}

4.controller

@RestController
public class UserContorller {

    private static final Logger LOGGER = LoggerFactory.getLogger(UserContorller.class);

    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private LoadBalancerClient loadBalancerClient;

    @GetMapping("/user/{id}")
    public User findById(@PathVariable Long id){
        return restTemplate.getForObject("http://eureka-provider/"+id,User.class);
    }

    @GetMapping("/log-user-instance")
    public void logUserInstance(){
        ServiceInstance serviceInstance = this.loadBalancerClient.choose("eureka-provider");
        // 打印当前选择的是那个节点
        UserContorller.LOGGER.info("{},{},{}",serviceInstance.getServiceId()
        ,serviceInstance.getHost(),serviceInstance.getPort());
    }
}

5.启动类

@SpringBootApplication
@EnableEurekaClient
public class ConsumerUserApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConsumerUserApplication.class, args);
    }
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

建表语句

CREATE TABLE `user` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`name` varchar(30) DEFAULT NULL COMMENT '姓名',
`age` int(11) DEFAULT NULL COMMENT '年龄',
`email` varchar(50) DEFAULT NULL COMMENT '邮箱',
`username` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '用户名',
`password` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT '密码',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1233288665214025731 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

INSERT INTO `user` VALUES (1, 'Jone', 18, 'test1@baomidou.com', '111', '222');
INSERT INTO `user` VALUES (2, 'Alice', 17, NULL, NULL, NULL);
INSERT INTO `user` VALUES (3, 'Jone', 18, 'test1@baomidou.com', NULL, NULL);

ps:

1.yml中application-name的名字不能用下划线不然RestTemplate无法调用。

2.若想多个提供者请复制上面提供者代码并且修改yml中的server-prot。

3.加了@LoadBalanced注解后在调用 @GetMapping("/user/{id}")会实现负载均衡。