SpringCloud-03_ribbon-优快云博客

本文详细介绍了如何在Spring Cloud项目中使用Ribbon组件实现客户端负载均衡，包括pom配置、application.properties设置、服务接口定义及控制器实现，最后展示了启动文件的配置。

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1. ribbon组件

ribbon配置文件 pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.tedu</groupId>
    <artifactId>springcloud-ribbon-client</artifactId>
    <version>1.0-SNAPSHOT</version>


    <!-- 此项目作为子项目继承cloud demo项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>

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

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Edgware.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

application.properties

server.port=9009
spring.application.name=server-ribbon
eureka.client.serviceUrl.defaultZone=http://localhost:8888/eureka

service

package cn.tedu.service;

import com.fasterxml.jackson.databind.annotation.JsonAppend;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class HelloService {

    @Autowired
    private RestTemplate client;

    //@bean+@loadbalance 注解，ribbon会对resttemplate发送任何请求做拦截操作，将域名寻找抓取的服务名称做为实例节点
    public String sayHi(String name){
       //http://service-hi/hello?name=wang
        String sayHi =client.getForObject("http://service-hi/hello?name="+name,String.class);
        return sayHi;
    }
}

controller

package cn.tedu.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import cn.tedu.service.HelloService;
@RestController
public class HelloController {
    @Autowired
    private  HelloService helloService;

    //客户端调用hi接口
    @RequestMapping("hi")
    public String sayHi(String name){
        return  "ribbon"+helloService.sayHi(name);
    }
}

启动文件

package cn.tedu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
public class StarterRibbon {
    public static void main(String[] args) {
        SpringApplication.run(StarterRibbon.class,args);
    }
    @Bean
    @LoadBalanced
    public RestTemplate initRestTemplate(){
        return new RestTemplate();
    }

}