1、 工具及软件版本
JDK: 1.8
Spring Boot: 2.3.0.RELEASE
Spring Cloud: Hoxton.SR6
Maven: 3.5.3
2、实现客户端侧负载均衡
2.1、创建Maven项目，artifactId是ribbon-server，pom.xml内容如下：
<project xmlns="maven.apache.org/POM/4.0.0" xmlns:xsi="www.w3.org/2001/XMLSch…"
xsi:schemaLocation="maven.apache.org/POM/4.0.0 maven.apache.org/xsd/maven-4…
4.0.0
com.baiyilanjian.cloud
ribbon-server
1.0.0
jar
org.springframework.boot
spring-boot-starter-parent
2.3.0.RELEASE
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
org.springframework.boot
spring-boot-starter-web
org.springframework.cloud
spring-cloud-starter-netflix-eureka-client
org.springframework.cloud
spring-cloud-dependencies
Hoxton.SR6
pom
import
org.springframework.boot
spring-boot-maven-plugin
2.2、spring boot的启动类，添加注解，@LoadBalanced 实例化RestTemplete，代码如下：
package com.baiyilanjian.cloud;
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.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.web.client.RestTemplate;
/**
Ribbon 实现客户端侧负载均衡
@author
*/
@SpringBootApplication
@EnableEurekaClient
public class RibbonServerApplication {
@LoadBalanced
@Bean
RestTemplate loadBalanced() {
return new RestTemplate();
}
@Primary
@Bean
RestTemplate restTemplate() {
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(RibbonServerApplication.class, args);
}
}
2.3，修改application.yml配置文件，代码如下：
spring:
application:
name: ribbon-server#服务名称
server:
指定该Eureka实例的端口
port:8086
logging:
level:
com.netflix: warn
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8081/eureka/
2.4、编写测试Controller TestController.java
package com.baiyilanjian.cloud.controller;import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import java.util.HashMap;
import java.util.Map;
@RestController
@RequestMapping("/test")
public class TestController {
private static final Loggerlogger = LoggerFactory.getLogger(TestController.class);
@Autowired
private RestTemplaterestTemplate;
@RequestMapping("test")
public String helloRibbon()throws JsonProcessingException {
ObjectMapper objectMapper =new ObjectMapper();
RestTemplate restTemplate =new RestTemplate();
String url ="http://xxxx";
HttpHeaders headers =new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
Map map =new HashMap<>();
map.put("name","");
map.put("password","");
String str = objectMapper.writeValueAsString(map);
HttpEntity request =new HttpEntity(str, headers);
ResponseEntity response = restTemplate.postForEntity( url, request , String.class );
System.out.println(response.getBody());
return response.getBody();
}
}
