spring cloud(服务消费者(利用ribbon实现服务消费及负载均衡)——初学二)
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
posted on 2017-06-12 17:24 Sunday_xiao 阅读(191) 评论(0) 编辑 收藏 举报