spring cloud 爲開發人員提供了快速構建分佈式系統的一些工具,包括配置管理、服務發現、斷路器、路由、微代理、事件總線、全局鎖、決策競選、分佈式會話等等。它運行環境簡單,能夠在開發人員的電腦上跑。另外說明spring cloud是基於springboot的,因此須要開發中對springboot有必定的瞭解,若是不瞭解的話能夠看這篇文章:2小時學會springboot。另外對於「微服務架構」 不瞭解的話,能夠經過搜索引擎搜索「微服務架構」瞭解下。java
當client向server註冊時,它會提供一些元數據,例如主機和端口,URL,主頁等。Eureka server 從每一個client實例接收心跳消息。 若是心跳超時,則一般將該實例從註冊server中刪除。web
建立過程同server相似,建立完pom.xml以下:spring
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<?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>
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經過註解@EnableEurekaClient 代表本身是一個eurekaclient.apache
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@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;
}
}
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僅僅@EnableEurekaClient是不夠的,還須要在配置文件中註明本身的服務註冊中心的地址,application.yml配置文件以下:瀏覽器
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eureka:
client:
serviceUrl:
defaultZone: http:
//localhost:8761/eureka/
server:
port:
8762
spring:
application:
name: service-hi
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須要指明spring.application.name,這個很重要,這在之後的服務與服務之間相互調用通常都是根據這個name 。
啓動工程,打開http://localhost:8761 ,即eureka server 的網址:springboot
你會發現一個服務已經註冊在服務中了,服務名爲SERVICE-HI ,端口爲7862架構
這時打開 http://localhost:8762/hi?name=forezp ,你會在瀏覽器上看到 :app
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hi forezp,i am from port:
8762
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架構代碼以下:maven
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分佈式