SpringCloud（四） ribbon负载均衡

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

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+1;
    }
}

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

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

我的github地址

SpringCloud（四） ribbon负载均衡

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