spring cloud（服务消费者（利用ribbon实现服务消费及负载均衡）—

Ribbon是一个基于HTTP和TCP客户端的负载均衡器，利用ribbon实现服务消费，并实现客户端的负载均衡。

一、准备工作(利用上一节的内容)

　　启动服务注册中心

　　启动computer-service

　　将computer-service的端口修改为2223，再次启动computer-service

　　访问　　localhost:1111

二、创建消费者

　　1、创建spring boot项目（利用idea的Spring Initializr快速创建项目）

　　2、添加ribbon依赖

<?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>com.daqsoft</groupId>

    <artifactId>customer_demo</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>customer_demo</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.4.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <spring-cloud.version>Dalston.SR1</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka</artifactId>

        </dependency>

        <!--添加ribbon依赖-->

        <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>${spring-cloud.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

　　3、启动类添加注解开启服务，添加RestTemplate实例并开启负载均衡

package com.daqsoft;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.context.embedded.LocalServerPort;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;

import org.springframework.cloud.netflix.feign.EnableFeignClients;

import org.springframework.context.annotation.Bean;

import org.springframework.web.client.RestTemplate;

@SpringBootApplication

//用来发现注册服务

@EnableDiscoveryClient

public class CustomerDemoApplication {

    /**

     * 创建实例并开启负载均衡

     * @return

     */

    @Bean

    @LoadBalanced

    RestTemplate restTemplate(){

        return new RestTemplate();

    }

    public static void main(String[] args) {

        SpringApplication.run(CustomerDemoApplication.class, args);

    }

}

　　4、创建消费方来消费add服务

package com.daqsoft;

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;

/**

 * @Description Created by liaoxx on 2017-6-12.

 */

@RestController

public class CustomController {

    @Autowired

    private RestTemplate template;

    @RequestMapping(value = "/add", method = RequestMethod.GET)

    public String add(){

        return template.getForEntity("http://COMPUTE-SERVICE/add?a=15&b=25",String.class).getBody();

    }

}

　　5、修改配置文件

spring.application.name=ribbon-consumer

server.port=3333

#服务注册中心地址

eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

　　6、启动服务，多次访问　　localhost:3333/add

　　　　在服务提供方不同端口打印出来的信息，实现了对服务的负载均衡

巴特西

spring cloud（服务消费者（利用ribbon实现服务消费及负载均衡）——初学二）

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