使用Spring Could 实现负载均衡
场景:在以上场景中 客户端请求一个之后,后面的服务需要能够负载均衡,本次采用Spring Could实现上述模型涉及到的 组件有 Eurekaserver(注册中心)Ribbon(负载均衡器)其中Eurekaserver用于服务端以及负载均衡器的注册,也就是保存了这些服务者的地址信息Ribbon 用于实现特定的负载均衡策略 注意点:提供同一个服务的不同服务提供者
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场景:
在以上场景中 客户端请求一个之后,后面的服务需要能够负载均衡,本次采用Spring Could实现上述模型涉及到的 组件有 Eurekaserver(注册中心)
Ribbon(负载均衡器)
其中
Eurekaserver用于服务端以及负载均衡器的注册,也就是保存了这些服务者的地址信息
Ribbon 用于实现特定的负载均衡策略 注意点:提供同一个服务的不同服务提供者的服务名需要相同
代码实例:
a.首先创建Eurekaserver注册中心
1.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>com.test</groupId>
<artifactId>could</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.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>
</properties>
<dependencies>
<!--eureka server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
<!-- spring boot test-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.RC1</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
2.创建主程序
@EnableEurekaServer
@SpringBootApplication
public class EurekaserverApplication {
public static void main(String[] args) {
new SpringApplicationBuilder(EurekaserverApplication.class).web(true).run(args);
}
}
3.配置文件application.properties
spring.application.name=eureka-server
server.port=10001
#强制不注册到注册服务器
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
#注册中心地址
eureka.client.serviceUrl.defaultZone=http://localhost:${server.port}/eureka/
#驱逐下线的服务,间隔,5秒,默认是60,建议开发和测试环境配置
#org.springframework.cloud.netflix.eureka.server.EurekaServerConfigBean.evictionIntervalTimerInMs
eureka.server.evictionIntervalTimerInMs=5000
4.启动,访问如下地址可看到注册中心的注册信息
127.0.0.1:10001
由于现在还没有服务注册,因而无法看到有什么注册服务的提供者信息
b.编写服务提供者 由于我们需要做负载均衡因为,服务提供者需要打成jar包,在不同的端口号上运行多个,这里只运行两个服务提供者
1.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>com.test</groupId>
<artifactId>service</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<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>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Brixton.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
2.编写主程序
@EnableDiscoveryClient
@SpringBootApplication
public class ComputeServiceApplication {
public static void main(String[] args) {
new SpringApplicationBuilder(ComputeServiceApplication.class).web(true).run(args);
}
}
3.编写提供服务的controller
@RestController
public class ComputeController {
private final Logger logger = Logger.getLogger(getClass());
@Autowired
private DiscoveryClient client;
@RequestMapping(value = "/add" ,method = RequestMethod.GET)
public String add(@RequestParam Integer a, @RequestParam Integer b) {
ServiceInstance instance = client.getLocalServiceInstance();
Integer r = a + b;
logger.info("/add, host:" + instance.getHost() + ", service_id:" + instance.getServiceId() + ", result:" + r);
return "service0:"+r;
}
}
4.配置文件application.properties
spring.application.name=compute-service
server.port=2222
eureka.client.serviceUrl.defaultZone=http://localhost:10001/eureka/
1.服务提供者2 为了区分 将返回值修改的不同,如下:
return "service1:"+r
2.配置文件
spring.application.name=compute-service
server.port=2223
eureka.client.serviceUrl.defaultZone=http://localhost:10001/eureka/
注意点就是服务名一样,
c.编写负载均衡服务
1.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>com.test</groupId>
<artifactId>couldRibbon</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<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>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Brixton.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
2.编写主程序
@SpringBootApplication
@EnableDiscoveryClient
public class RibbonApplication {
@Bean
@LoadBalanced
RestTemplate restTemplate(){
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(RibbonApplication.class,args);
}
}
3.编写对外暴露的服务提供接口
@RestController
@RequestMapping("/h1")
public class ConsumerController {
@Autowired
RestTemplate restTemplate;
@RequestMapping("/keys")
public @ResponseBody
Object getKeyValue(@RequestParam int a, @RequestParam int b) {
return restTemplate.getForEntity("http://COMPUTE-SERVICE/add?a=" + a + "&b=" + b, String.class).getBody();
}
}
4.编写配置文件application.properties
spring.application.name=ribbon-consumer
server.port=8003
eureka.client.serviceUrl.defaultZone=http://localhost:10001/eureka/
这样我们就完成了上述的场景编码
启动服务
首先需要启动注册中,在启动服务,在启动负载均衡服务,通过postman工具进行访问
127.0.0.1:8003/h1/keys?a=1&b=2
可以看到负载均衡的效果。
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