Spring Cloud - Ribbon负载均衡
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2022-06-13 10:46:40
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一.前言
在Spring Cloud - Ribbon的真情独白中,我们已经给他们介绍了ribbon。今天我们通过一个小案例,来简单入门ribbon;
在今天的案例中,我们启动三个服务提供方,结合ribbon,来看看具体的负载均衡效果。
二.创建项目
经过上面一顿骚操作,我们的模块就成功创建了[controller和service后来创建
];
三.配置项目
3.1 springcloud-ribbon
3.1.1 添加@EnableDiscoveryClient
@SpringBootApplication
@EnableDiscoveryClient
public class ServiceProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceProviderApplication.class, args);
}
}
3.1.2 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.milo</groupId>
<artifactId>milgenius-springcloud</artifactId>
<version>1.0.0</version>
</parent>
<groupId>com.milo</groupId>
<artifactId>springcloud-ribbon</artifactId>
<version>1.0.0</version>
<name>springcloud-ribbon</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3.1.3 application.yml
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
server:
port: 8768
spring:
application:
name: service-ribbon
3.1.4 相关代码
ConsumerController
:
/**
* @author: Milogenius
* @create: 2019-06-28 13:45
* @description:
**/
@RestController
public class ConsumerController {
@Autowired
private IConsumerService consumerService;
@RequestMapping(value = "/hello",method = RequestMethod.GET)
public String index(@RequestParam String name){
return consumerService.hello(name);
}
}
IConsumerService
:
/**
* @author: Milogenius
* @create: 2019-06-28 13:48
* @description:
**/
public interface IConsumerService {
String hello(String name);
}
ConsumerServiceImpl
:
/**
* @author: Milogenius
* @create: 2019-06-28 13:49
* @description:
**/
@Service
public class ConsumerServiceImpl implements IConsumerService {
@Autowired
RestTemplate restTemplate;
@Override
public String hello(String name) {
return restTemplate.getForObject("http://SERVICE-PROVIDER:8762/hello?name="+name,String.class);
}
}
3.2 springcloud-service-provider
本次测试的服务提供方,我们还是使用Spring Cloud - Eureka Client文中提到的springcloud-service-provider
模块,但是我们需要做一些修改。
ProviderController:
/**
* @author: Milogenius
* @create: 2019-06-28 12:14
* @description:
**/
@RestController
@Slf4j
public class ProviderController {
//变动的地方
@Value("${server.port}")
private String port;
@Autowired
private DiscoveryClient client;
@RequestMapping(value = "/hello",method = RequestMethod.GET)
public String index(){
log.info("hello");
//响应时候带着端口号,可以看到从那台服务器响应的内容
return "hello world from Port:"+port;
}
}
四.案例测试
首先,我们启动注册中心springcloud-eureka-server
接着,我们启动springcloud-ribbon
下面,我们启动三个服务,在启动之前,需要阅读如何在IntelliJ Idea中同时启动不同端口的两个实例
如上图所示,依次修改端口号启动三个服务;
至此,我们项目启动完成;
接下来,我们测试一下客户端负载均衡:
通过上面的图片,我们可以看到请求负载到了我们的三个服务,实现了我们开头中提到的目标;
示例代码
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