客户端负载均衡组件。
搭建一个Eureka集群和一个注册服务
https://www.cnblogs.com/noneplus/p/11374883.html
- 创建服务提供者msc-provider-5002,msc-provider-5003
- 创建消费者msc-consumer-80
服务提供者msc-provider-5001,msc-provider-5002，msc-provider-5003：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.7.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</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-config</artifactId> </dependency> <!-- Eureka客户端启动需要依赖web模块--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> 消费者msc-consumer-80:
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.7.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <!-- Eureka客户端启动需要依赖web模块--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${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> - 主启动类：(提供者并不需要进行注解配置)
- TestController（测试负载均衡）
package zkrun.top.controller; import org.springframework.web.bind.annotation.*; @RestController public class TestController { @GetMapping(value = "/info/get") public String response() { return "msc_provider_5001"; } } - application.yaml(基本无修改，对比Eureka配置)
server: port: 5001 spring: application: name: msc-provider #应用名称 eureka: client: service-url: defaultZone: http://eureka6001.com:6001/eureka/,http://eureka6002.com:6002/eureka/,http://eureka6003.com:6003/eureka/ instance: instance-id: msc-provider-5001 prefer-ip-address: true #访问路径可以显示IP地址
- 主启动类（修改类名）
- TestController（修改返回值）
- application.yaml（修改端口和instance-id）
大致的效果就是访问不同的端口，有不同的返回值：
- RibbonConfig
package zkrun.top.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; @Configuration public class RibbonConfig { @Bean @LoadBalanced public RestTemplate getRestTemplate() { return new RestTemplate(); } } - Controller_Consumer
package zkrun.top.controller; 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; @RestController public class Controller_Consumer { private static final String REST_URL_PREFIX = "http://MSC-PROVIDER"; @Autowired private RestTemplate restTemplate; @RequestMapping(value = "/consumer/info/get") public String request() { return restTemplate.getForObject(REST_URL_PREFIX + "/info/get", String.class); } } - yaml
server: port: 80 eureka: client: register-with-eureka: false service-url: defaultZone: http://eureka6001.com:6001/eureka/,http://eureka6002.com:6002/eureka/,http://eureka6003.com:6003/eureka/
- 主类（@RibbonClient(name="MSC_PROVIDER")）
package zkrun.top; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.netflix.ribbon.RibbonClient; @SpringBootApplication @EnableEurekaClient @RibbonClient(name="MSC_PROVIDER") public class App_msc_consumer_80 { public static void main(String[] args) { SpringApplication.run(App_msc_consumer_80.class, args); } } 启动Eureka6001，6002，6003
启动Provider5001，5002，5003
启动Consumer80
访问：
http://localhost/consumer/info/get
点击刷新就会有轮询效果：
在RibbonConfig下添加
@Bean public IRule myRule() { return new RandomRule();// Ribbon默认是轮询，自定义为随机 //return new RoundRobinRule();// Ribbon默认是轮询 } 
支持的算法：
代码参考：https://github.com/HCJ-shadow/Ribbon