SpringCloud Ribbon服务应用

矫情吗；* 2022-03-16 09:14 166阅读 0赞

![20190227110019256.png][]

个人博客网：www.lfuping.cn    (你想要这里多有)

![20181126154005.png][]

1. Ribbon是客户端负载均衡，所以肯定集成再消费端，也就是consumer端

修改springCloud-consumer-1工程  
引入依赖，pom.xml 加入 ribbon相关依赖

dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-ribbon</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>

application.yml加

因为我电脑配置有限，就没用eureka集群做测试了，只用了eureka单机配置

eureka:
      client:
        register-with-eureka: false 
        service-url: 
          defaultZone: http://localhost:7001/eureka/

ribbon结合eureka来调用服务提供者；

SpringCloudConfig也改成 要加个负载均衡配置 [@LoadBalanced][LoadBalanced]

package com.li.spingcloud.consumer.config;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.client.RestTemplate;
    /**
     * SpringCloud相关配置
     * 
     * @author Administrator
     *
     */
    @Configuration
    public class SpringCloudConfig {
        /**
         * 调用服务模版对象
         * 
         * @return
         */
        @Bean
        @LoadBalanced  // 引入ribbon负载均衡
        public RestTemplate getRestTemplate() {
            return new RestTemplate();
        }
    }

因为和eureka整合，所以启动类ConsumerApplication 加个注解 [@EnableEurekaClient][EnableEurekaClient]  
修改ConsumerController层，

package com.li.spingcloud.consumer.controller;
    import java.util.List;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    import com.li.springcloud.common.model.Student;
    /**
     * 服务消费者-控制器
     * 
     * @author Administrator
     *
     */
    @RestController
    public class ConsumerController {
        @Autowired
        private RestTemplate restTemplate;
        /**
         * 查询信息
         * 
         * @return
         */
        @RequestMapping(value = "/consumer/list", produces = "application/json; charset=utf-8", method = {
                RequestMethod.POST, RequestMethod.GET })
        public List<Student> list() {
        //改成指定的微服务应用名称 PROVIDER
            List<Student> result = restTemplate.getForObject(
                    "http://PROVIDER/provider/list", List.class);
            // 通过注册中心调用消费者提供的服务
            return result;
        }
    }

2.修改SpringClodu-provider-1服务生产者application.yml配置

主要是加配置，指定下应用名称：

application:  
name: provider

server:
      port: 1001
      context-path: /
    # 数据源配置
    spring:
      application:
        name: provider
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/springcloudDB
        username: root
        password: lifuping0.
      jpa:
        hibernate:
          ddl-auto: update
        show-sql: true
    eureka:
      instance:
        hostname: eureka1  #eureka客户端主机实例名称
        appname: provider  #客户端服务名
        instance-id: springcloud-provider:1001 #客户端实例名称
        prefer-ip-address: true #显示IP
      client: 
        service-url: 
          defaultZone: http://localhost:7001/eureka/
          #集群模式defaultZone: http://lifuping.eureka3.com:6001/eureka/,http://lifuping.eureka2.com:5001/eureka/,http://lifuping.eureka1.com:7001/eureka/ # 集群
          #单机defaultZone: http://localhost:7001/eureka   
          #把服务注册到eureka注册中心

微服务应用名称是 provider  
所以服务调用者这边的控制器里PRE\_HOST改成 [http://PROVIDER/provider/list][http_PROVIDER_provider_list] 即可；

3.测试

先启动eureka单机，然后再启动服务提供者，再启动服务消费者；  
![20190110152335.png][]  
访问消费者接口: [http://localhost:8080/consumer/list][http_localhost_8080_consumer_list]  
正常没问题浏览器返回：

![20190110152304.png][]

如果出现如下错误：  
![20181205145730.png][]

刷新浏览器页面可能是延迟，如果不行那可能是你配置写错了，仔细检查一下确认真的没有问题，也有可能是电脑环境的问题，重启电脑在重试几次

源码下载链接: https://pan.baidu.com/s/11usvmZUS0ZGDyhp5FxQl8A 
    
    提取码: bhbx

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[20190227110019256.png]: /images/20220316/46a1c6962f204b3eb400368f7a438051.png
[20181126154005.png]: /images/20220316/fd7a52b8338c48e084fcc460a17c4432.png
[LoadBalanced]: https://github.com/LoadBalanced
[EnableEurekaClient]: https://github.com/EnableEurekaClient
[http_PROVIDER_provider_list]: http://provider/provider/list
[20190110152335.png]: /images/20220316/4f5b63c95944444b8e514c4136127f38.png
[http_localhost_8080_consumer_list]: http://localhost:8080/consumer/list
[20190110152304.png]: /images/20220316/6396a735905e46d997dd1a5182cf39d6.png
[20181205145730.png]: /images/20220316/05f872cfe00d4c968f3f1d8413fe78b3.png
[gzh.png]: /images/20220316/8e61d0990a8647dbb5b2a032c4fcce89.png