一、ribbon簡介
Ribbon is a client side load balancer which gives you a lot of control over the behaviour of HTTP and TCP clients. Feign already uses Ribbon, so if you are using @FeignClient then this section also applies.
—–摘自官網
ribbon是一個負載均衡客戶端,可以很好的控制htt和tcp的一些行為。Feign預設整合了ribbon。
ribbon 已經預設實現了這些配置bean:
IClientConfig ribbonClientConfig: DefaultClientConfigImpl
IRule ribbonRule: ZoneAvoidanceRule
IPing ribbonPing: NoOpPing
ServerList ribbonServerList: ConfigurationBasedServerList
ServerListFilter ribbonServerListFilter: ZonePreferenceServerListFilter
ILoadBalancer ribbonLoadBalancer: ZoneAwareLoadBalancer
二、準備工作
這一篇文章基於上一篇文章的工程,啟動eureka-server 工程;啟動service-hi工程,它的埠為8762;將service-hi的配置檔案的埠改為8763,並啟動,這時你會發現:service-hi在eureka-server註冊了2個例項,這就相當於一個小的叢集。訪問localhost:8761如圖所示:
三、建一個服務消費者
重新新建一個spring-boot工程,取名為:service-ribbon;
在它的pom.xml檔案分別引入起步依賴spring-cloud-starter-eureka、spring-cloud-starter-ribbon、spring-boot-starter-web,程式碼如下:
<?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.forezp</groupId>
<artifactId>service-hi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>service-hi</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.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>
<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>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>複製程式碼
通過註解@EnableEurekaClient 表明自己是一個eurekaclient.
@SpringBootApplication
@EnableEurekaClient
@RestController
public class ServiceHiApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceHiApplication.class, args);
}
@Value("${server.port}")
String port;
@RequestMapping("/hi")
public String home(@RequestParam String name) {
return "hi "+name+",i am from port:" +port;
}
}複製程式碼
僅僅@EnableEurekaClient是不夠的,還需要在配置檔案中註明自己的服務註冊中心的地址,application.yml配置檔案如下:
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
server:
port: 8762
spring:
application:
name: service-hi複製程式碼
需要指明spring.application.name,這個很重要,這在以後的服務與服務之間相互呼叫一般都是根據這個name 。
啟動工程,開啟http://localhost:8761 ,即eureka server 的網址:
你會發現一個服務已經註冊在服務中了,服務名為SERVICE-HI ,埠為7862
這時開啟 http://localhost:8762/hi?name=forezp ,你會在瀏覽器上看到 :
hi forezp,i am from port:8762複製程式碼
架構程式碼如下:
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