dubbo进阶--入门实例

  注册中心搭建好之后，现在开始进行一个dubbo实例，来体验一下dubbo的魅力。

  为了方便的管理jar包，本次使用的是maven项目。

  项目主要结构：

    提供者：

            

    消费者：

        

   实现过程：

     本次的demo属于简单入门，所以从代码上来看没有多少，主要是看dubbo是如何进行提供分布式服务的。

    服务提供者：

     首先配置pom文件，引入必要的jar包：       

<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.wpb.dubbo</groupId>
  <artifactId>dubbo-provide</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
		<spring.version>4.1.3.RELEASE</spring.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.4.10</version>
			<exclusions>
				<exclusion>
					<artifactId>spring</artifactId>
					<groupId>org.springframework</groupId>
				</exclusion>
			</exclusions>
		</dependency>

		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.3</version>
		</dependency>
	</dependencies>
</project>

      接口，就定义了一个sayHello方法：        

public interface DubboProvide {

	void sayHello();
}

      接口实现方法： 

public class DubboProvideImpl implements DubboProvide {

	public void sayHello() {
       System.out.println("this is my first dubbo program");
	}

}

     方法定义好之后，进行核心配置文件的配置ApplicaionContextProducror.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  
        ">      
        <!-- 给dubbo服务者起个名 -->  
        <dubbo:application name="productor"/>  
        <!-- 用zookeeper注册服务中心暴露服务地址 -->  
        <dubbo:registry protocol="zookeeper" address="zookeeper://192.168.91.130:2181"/>  
        <!-- 暴露dubbo的通信端口 -->  
        <dubbo:protocol name="dubbo" port="20880"/>  
        <!-- 给消费者提供服务的接口 -->  
        <dubbo:service ref="bubboProdutor" interface="com.dubbo.service.DubboProvide"></dubbo:service>  
        <!-- 提供服务的实现类 -->  
        <bean id="bubboProdutor" class="com.dubbo.service.impl.DubboProvideImpl"></bean>  
</beans>  

    然后创建main方法来启动服务，方法如下：    

public class DubboProvideStart {

	 public static void main(String[] args) throws Exception {  
	        ClassPathXmlApplicationContext cfg = new ClassPathXmlApplicationContext("classpath:config/ApplicationContextProducror.xml");  
	        cfg.start();  
	        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
	        Date date = new Date();   
	        System.out.println("provider service start time："+sdf.format(date));  
	        //保证服务始终开启  
	        System.in.read();  
	    }  
}

   服务提供方启动之后，再来看一下消费者的主要代码：

    pom文件：     

<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.wpb.dubbo</groupId>
  <artifactId>dubbo-consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
		<spring.version>4.1.3.RELEASE</spring.version>
	</properties>
	<dependencies>
	   <dependency>
	        <!-- 引入提供方服务接口 -->
			<groupId>com.wpb.dubbo</groupId>
			<artifactId>dubbo-provide</artifactId>
			<version>0.0.1-SNAPSHOT</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
			<version>2.4.10</version>
			<exclusions>
				<exclusion>
					<artifactId>spring</artifactId>
					<groupId>org.springframework</groupId>
				</exclusion>
			</exclusions>
		</dependency>

		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.3</version>
		</dependency>
	</dependencies>
</project>

    配置文件ApplicationContextCustomer.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  
        ">       
          
        <!-- 消费者名称 -->  
        <dubbo:application name="customer"/>  
        <!-- 用zookeeper注册服务中心发现服务地址 -->  
        <dubbo:registry protocol="zookeeper"  address="zookeeper://192.168.91.130:2181"/>  
        <!-- 调用远程的接口 -->  
        <dubbo:reference id="dubboProvider" interface="com.dubbo.service.DubboProvide"/>  
          
</beans>  

    配置好之后，就可以创建main方法来启动消费者了，方法如下：      

public class CustomerMain {
	 public static void main(String[] args) throws InterruptedException{  
	        ClassPathXmlApplicationContext cfig = new ClassPathXmlApplicationContext("classpath:config/ApplicationContextCustomer.xml");  
	        DubboProvide test = (DubboProvide) cfig.getBean("dubboProvider");  
	        System.out.println("consumer connect to service begin");  
	        test.sayHello();  
	        Thread.sleep(100000);  
	        System.out.println("consumer connect to service end");  
	    }  
}

  demo下载地址：dubbo+zookeeper入门实例

  至此，dubbo的提供方和消费方已经创建好，我们也可以通过启动程序来看到真实的效果，然后就可以通过代码来感受一下dubbo的优点。