使用maven多模組構建dubbo第一個分散式HelloWorld
阿新 • • 發佈:2019-01-05
至於為什麼要用maven多模組構建專案,和dubbo是做什麼的就不多說了,直接開始。
首先建立一個maven專案作為root模組 命名為mydubbo,並刪除其中的src目錄(不需要)
除外我們需要Spring,zookeeper的依賴
mydubbo->pom.xml
<?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</groupId> <artifactId>mydubbo</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <properties> <spring.version>3.2.4.RELEASE</spring.version> </properties> <modules> <module>myProvider</module> <module>myConsumer</module> <module>myService</module> </modules> <dependencies> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> <exclusions> <exclusion> <groupId>org.springframework</groupId> <artifactId>spring</artifactId> </exclusion> </exclusions> </dependency> <!--dubbo註冊中心--> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.6</version> </dependency> <!--zookeeper客戶端--> <dependency> <groupId>com.github.sgroschupf</groupId> <artifactId>zkclient</artifactId> <version>0.1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> </dependencies> </project>
然後建立三個maven子模組分別為myService、myProvider、myConsumer
myService:功能介面模組
myProvider:dubbo提供者
myConsumer:dubbo消費者
因為消費者和提供者的功能介面一致,所以都依賴myService模組(myService的專案packing 為 jar)
myProvider->pom.xml
<?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"> <parent> <artifactId>mydubbo</artifactId> <groupId>com</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>myProvider</artifactId> <dependencies> <dependency> <groupId>com</groupId> <artifactId>myService</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> </project>
myConsumer->pom.xml
<?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"> <parent> <artifactId>mydubbo</artifactId> <groupId>com</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>myConsumer</artifactId> <dependencies> <dependency> <groupId>com</groupId> <artifactId>myService</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> </project>
myService->pom.xml
<?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">
<parent>
<artifactId>mydubbo</artifactId>
<groupId>com</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<name>myService</name>
<artifactId>myService</artifactId>
<packaging>jar</packaging>
</project>
在myService中建立一個Interface,命名為HelloService,具體如下
HelloService.java
package com.service;
/**
* Created by yuyufeng on 2016/11/16.
*/
public interface HelloService {
String speakHello(String name);
}
現在,我們需要install myService這個專案,產生一個可以依賴的jar供其它引用者使用。
myProvider的依賴就有myService產生的jar
現在,開始編寫dubbo提供者myProvider的程式碼
首先,需要提供HelloService的實現
HelloServiceImpl.java
package com.service.impl;
import com.service.HelloService;
/**
* Created by yuyufeng on 2016/11/16.
*/
public class HelloServiceImpl implements HelloService {
public String speakHello(String name) {
return "你好:" + name;
}
}
然後使用Spring配置宣告暴露服務,建立一個provider.xml 如下
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 提供方應用資訊,用於計算依賴關係 -->
<dubbo:application name="hello-provider" />
<!-- 使用multicast廣播註冊中心暴露服務地址 -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- 用dubbo協議在20880埠暴露服務 -->
<dubbo:protocol name="dubbo" port="20880" />
<!-- 宣告需要暴露的服務介面 -->
<dubbo:service interface="com.service.HelloService" ref="helloService" />
<!-- 和本地bean一樣實現服務 -->
<bean id="helloService" class="com.service.impl.HelloServiceImpl" />
</beans>
本次dubbo使用的註冊中心為zookeeper,所以需要在本地啟動一個zookeeper服務。
最後,我們就可以啟動提供者服務了,啟動類如下:
package com.service.impl;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
/**
* Created by yuyufeng on 2016/11/16.
*/
public class ProviderServer{
public static void main(String[] args) throws IOException {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
context.start();
//按任意鍵退出
System.in.read();
}
}
啟動之後我們可以在zookeeper註冊中心看到我們的服務提供者已經註冊在上面
然後,就編寫個消費者通過dubbo來調以下遠端的服務吧
消費者通過Spring配置引用遠端服務spring配置檔案如下:
consumer.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 消費方應用名,用於計算依賴關係,不是匹配條件,不要與提供方一樣 -->
<dubbo:application name="hello-consumer" />
<!-- 使用multicast廣播註冊中心暴露發現服務地址 -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- 生成遠端服務代理,可以和本地bean一樣使用demoService -->
<dubbo:reference id="helloService" interface="com.service.HelloService" />
</beans>
消費者啟動類
ConsumerClient.java
import com.service.HelloService;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by yuyufeng on 2016/11/16.
*/
public class ConsumerClient {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("consumer.xml");
HelloService helloService = (HelloService) context.getBean("helloService");
String result = helloService.speakHello("yyf");
System.out.println(result);
}
}
執行改類,結果如下:
可以看到,遠端服務呼叫成功。