SpringCloud中使用配置文件自定义Ribbon Client

创建工程

具体实现

pom.xml

  4.0.0
  com.itmuch.cloud
  microservice-consumer-movie-ribbon-customizing-properties
  0.0.1-SNAPSHOT
  jar

  
  
    org.springframework.boot
    spring-boot-starter-parent
    1.4.3.RELEASE
  

  
    UTF-8
    1.8
  

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

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

  
  
    
      
        org.springframework.cloud
        spring-cloud-dependencies
        Camden.SR4
        pom
        import
      
    
  

  
  
    
      
        org.springframework.boot
        spring-boot-maven-plugin
      
    
  

application.yml

server:
  port: 8010
spring:
  application:
    name: microservice-consumer-movie
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true

#这里选用的是负载均衡的[随机策略]
microservice-provider-user:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

关键处：

#这里选用的是负载均衡的[随机策略]
microservice-provider-user:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

说明：还可以更换不同的策略；

User

package com.itmuch.cloud.study.user.entity;

import java.math.BigDecimal;

public class User {
  private Long id;
  private String username;
  private String name;
  private Integer 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 Integer getAge() {
    return this.age;
  }

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

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

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

ConsumerMovieApplication

package com.itmuch.cloud.study;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

/**
 * 用配置文件来完成自定义
 */
@EnableDiscoveryClient
@SpringBootApplication
public class ConsumerMovieApplication {
  @Bean
  @LoadBalanced
  public RestTemplate restTemplate() {
    return new RestTemplate();
  }

  public static void main(String[] args) {
    SpringApplication.run(ConsumerMovieApplication.class, args);
  }
}

MovieController

package com.itmuch.cloud.study.user.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import com.itmuch.cloud.study.user.entity.User;

@RestController
public class MovieController {
  private static final Logger LOGGER = LoggerFactory.getLogger(MovieController.class);
  @Autowired
  private RestTemplate restTemplate;
  @Autowired
  private LoadBalancerClient loadBalancerClient;

  @GetMapping("/test")
  public String test() {
    ServiceInstance serviceInstance = this.loadBalancerClient.choose("microservice-provider-user");
    System.out.println("--------随机："+serviceInstance.getHost()+":"+serviceInstance.getPort()+":"+serviceInstance.getServiceId());

    ServiceInstance serviceInstance2 = this.loadBalancerClient.choose("microservice-provider-user2");
    System.out.println("--------轮询："+serviceInstance2.getHost()+":"+serviceInstance2.getPort()+":"+serviceInstance2.getServiceId());

    return "1";
  }

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

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

启动测试

启动

启动eureka,在启动四个提供示例；

microservice-provider-user:8000

microservice-provider-user:8001(改端口)

microservice-provider-user2:8002（改服务名和端口）

microservice-provider-user2:8003（改服务名和端口）

查看eureka

访问测试

http://localhost:8010/test (多次访问)

控制台输出：

--------轮询：192.168.1.102:8002:microservice-provider-user2
--------随机：192.168.1.102:8000:microservice-provider-user
--------轮询：192.168.1.102:8003:microservice-provider-user2
--------随机：192.168.1.102:8000:microservice-provider-user
--------轮询：192.168.1.102:8002:microservice-provider-user2
--------随机：192.168.1.102:8000:microservice-provider-user
--------轮询：192.168.1.102:8003:microservice-provider-user2
--------随机：192.168.1.102:8000:microservice-provider-user
--------轮询：192.168.1.102:8002:microservice-provider-user2
--------随机：192.168.1.102:8001:microservice-provider-user
--------轮询：192.168.1.102:8003:microservice-provider-user2
--------随机：192.168.1.102:8001:microservice-provider-user
--------轮询：192.168.1.102:8002:microservice-provider-user2
--------随机：192.168.1.102:8001:microservice-provider-user
--------轮询：192.168.1.102:8003:microservice-provider-user2
--------随机：192.168.1.102:8001:microservice-provider-user
--------轮询：192.168.1.102:8002:microservice-provider-user2

......

#这里选用的是负载均衡的[随机策略]
microservice-provider-user:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

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