dubbo学习之Hello world

现在企业中使用dubbo的越来越多，今天就简单的学习一下dubbo，写了一个hello world，教程仅供入门，如要深入学习请上官网

服务提供方：

首先将提供方和消费方都引入jar包，如果使用的是maven管理项目，可以直接加入dubbo的配置

<!—dubbo start -->

<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 end  -->

<!-- zookeeper start -->
<dependency>
    <groupId>org.apache.zookeeper</groupId>
    <artifactId>zookeeper</artifactId>
    <version></version>
</dependency>
<dependency>
    <groupId>com.101tec</groupId>
    <artifactId>zkclient</artifactId>
    <version>${zkclient_version}</version>
</dependency>
<!-- zookeeper end –>

声明接口：

public interface UserInfoService { 

    String sayHello(String name);

}

实现接口：

public class UserInfoServiceImpl implements UserInfoService{

    public String sayHello(String name) {
        return name + " Hello !";
    }

}

配置applicationContext.xml文件：

<?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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <dubbo:application name="hello-world-app"/>
    <!-- 注册地址 -->
    <dubbo:registry address="zookeeper://192.168.0.123:2181" ></dubbo:registry> 

    <dubbo:protocol name="dubbo" port="20880"></dubbo:protocol> 

    <dubbo:service ref="userInfoService" interface="com.zhiyi.service.UserInfoService" />
    <!-- designate implementation -->
    <bean id="userInfoService" class="com.zhiyi.service.impl.UserInfoServiceImpl" />

</beans> 

程序启动入口：

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.google.common.util.concurrent.AbstractIdleService;

public class BootStart extends AbstractIdleService{

    ClassPathXmlApplicationContext context = null; 

    public static void main(String[] args) {
        BootStart bootStart = new BootStart();
        bootStart.startAsync();
        try {
            Object lock = new Object();
            synchronized (lock) {
                while(true){
                    lock.wait();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    } 

    @Override
    protected void shutDown() throws Exception {
        if( context != null){
            context.stop();
        }
    }

    @Override
    protected void startUp() throws Exception {
        String configure = "applicationContext.xml";
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(configure); 

        String[] beans = context.getBeanDefinitionNames(); 

        for( String bean : beans){
            System.out.println("beanName:"+bean);
        }
        context.start();
        context.registerShutdownHook();
        System.out.println("provider is start!"); 

    }
}

服务消费方：

配置applicationContext.xml

注意：在消费方需要引入接口

<?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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <dubbo:application name="consumer-of-hello-world"/>

    <dubbo:registry address="zookeeper://192.168.0.123:2181"></dubbo:registry>

    <dubbo:reference id="userInfoService" interface="com.zhiyi.service.UserInfoService"></dubbo:reference> 

</beans> 

服务消费方入口：

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zhiyi.service.UserInfoService;

public class BootStart {

    public static void main(String[] args) {
        BootStart bootStart = new BootStart();
        bootStart.start();
    } 

    public void start(){
        String applicationConfig = "applicationContext.xml";
        ApplicationContext context = new ClassPathXmlApplicationContext(applicationConfig);
        String[] beans = context.getBeanDefinitionNames();
        for(String bean : beans){
            System.out.println("beanName:"+bean);
        } 

        UserInfoService userInfoService = (UserInfoService) context.getBean("userInfoService");
        System.out.println(userInfoService.sayHello("zhangsan"));
    }
}

好了，就是这么简单，dubbo的hello world就完成了，欢迎大神拍砖～