SpringCloud（四） ribbon负载均衡

痛定思痛。 2022-05-22 20:36 253阅读 0赞

在集群环境下，负载均衡很重要。下面演示客户端的负载均衡ribbon

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>

eureka client的依赖中已经集成了ribbon的依赖，所以不用引依赖了。

创建第一个服务端：

controller代码：

package com.xhx.springcloud.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * xuhaixing
     * 2018/6/3 16:18
     */
    @RestController
    @RequestMapping(value = "hello")
    public class HelloController {
    
        @RequestMapping(value = "getName")
        public String getName(String name){
            return name+2;
        }
    }

配置文件

server:
      port: 8081
    eureka:
      client:
        service-url:
          defaultZone: http://localhost:8761/eureka
    spring:
      application:
        name: eureka-service

创建第二个服务端，spring.spplication.name应该和第一个服务端一样

配置文件：

server:
      port: 8080
    eureka:
      client:
        service-url:
        defaultZone: http://localhost:8761/eureka
    spring:
      application:
        name: eureka-service

启动eureka与两个服务端，然后打开网页127.0.0.1:8761

![70][]

可以看到两个服务端都注册到一起了。

创建一个eureka-client

配置ribbon

package com.xhx.springcloud.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;
    
    /**
     * xuhaixing
     * 2018/6/3 16:24
     */
    @Configuration
    public class RibbonConfig {
    
    
        @Bean
        @LoadBalanced
        public RestTemplate getRestTemplate(){
            return new RestTemplate();
        }
    }

配置文件：

server:
      port: 8085
    eureka:
      client:
        service-url:
        defaultZone: http://localhost:8761/eureka
    spring:
      application:
        name: eureka-client

controller，注入restTemplate，通过服务名称请求eureka-server

package com.xhx.springcloud.controller;
    
    import com.netflix.discovery.converters.Auto;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * xuhaixing
     * 2018/6/3 16:27
     */
    @RestController
    public class RibbionController {
    
        @Autowired
        private RestTemplate restTemplate;
    
        @RequestMapping(value = "getName")
        public String getName(String name){
            return restTemplate.getForObject("http://eureka-service/hello/getName?name="+name,String.class);
        }
    }

用postman请求，一次返回 xxx1 一次返回xxx2，采用的轮询策略

![70 1][]

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[70]: /images/20220523/90032dcd9ea945dfbdaad65805cafd03.png
[70 1]: /images/20220523/b60e59d553114c5eb7798ba646d440d0.png
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