-安裝zookeeper
1.在官網上下載zookeeper安裝檔案，解壓，重新命名zookeeper-3.4.5\conf目錄下的zoo_sample.cfg為zoo.cfg
2.在zookeeper-3.4.5\bin目錄下,雙擊zkServer.cmd開啟zookeeper伺服器

-安裝dubbo
1新建maven專案，在pom檔案中新增如下依賴：引入如下三個主要的包就可以了，主要是spring,dubbo以及zkclient

    <dependency>
            <groupId>org.springframework</groupId
 
>
            <artifactId>spring-context</artifactId>
            <version>${spring-framework.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>

新建一個介面：

public interface DemoService {
    String sayHello(String name);

    public List<User> getUsers();
}

實現介面：

public class DemoServiceImpl implements DemoService {

    public String sayHello(String name) {
        System.out.println("----------");
        return "Hello " + name;
    }

    public List<User> getUsers() {
        List<User> list = new ArrayList<User>();
        User u1 = new User();
        u1.setName("jack");
        u1.setAge(20);
        u1.setSex("男");

        User u2 = new User();
        u2.setName("tom");
        u2.setAge(21);
        u2.setSex("女");

        User u3 = new User();
        u3.setName("rose");
        u3.setAge(19);
        u3.setSex("女");

        list.add(u1);
        list.add(u2);
        list.add(u3);
        return list;
    }
}

配置producter的Spring配置檔案：

<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  
        ">  

    <!-- 具體的實現bean -->  
    <bean id="demoService" class="com.unj.dubbotest.provider.DemoServiceImpl" />  

    <!-- 提供方應用資訊，用於計算依賴關係 -->  
    <dubbo:application name="xixi_provider"  />  

    <!-- 使用multicast廣播註冊中心暴露服務地址   
    <dubbo:registry address="multicast://127.0.0.1:1234" />-->  

    <!-- 使用zookeeper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.unj.dubbotest.provider.DemoService" ref="demoService" />  

</beans>

開啟服務：

public class Producter {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "applicationContext-producter.xml" });
        context.start();
        System.out.println("start");
        System.in.read(); // 為保證服務一直開著，利用輸入流的阻塞來模擬
    }
}

配置consumer的spring配置檔案

<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="hehe_consumer" />  

    <!-- 使用zookeeper註冊中心暴露服務地址 -->  
    <!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->  
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />  

    <!-- 生成遠端服務代理，可以像使用本地bean一樣使用demoService -->  
    <dubbo:reference id="demoService"  
        interface="com.unj.dubbotest.provider.DemoService" />  

</beans>  

consumer來使用服務

public class Consumer {  

    public static void main(String[] args) throws Exception {  
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(  
                new String[] { "applicationContext-consumer.xml" });  
        context.start();  

        DemoService demoService = (DemoService) context.getBean("demoService"); //  
        String hello = demoService.sayHello("tom"); // ִ  
        System.out.println(hello); //   

        //   
        List<User> list = demoService.getUsers();  
        if (list != null && list.size() > 0) {  
            for (int i = 0; i < list.size(); i++) {  
                System.out.println(list.get(i));  
            }  
        }  
        // System.out.println(demoService.hehe());  
        System.in.read();  
    }  

}

使用的user類如下：

public class User implements Serializable{
    private String name;
    private String sex;
    private int age;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }

先啟動producter，再啟動consumer執行結果如下：

遠端呼叫失敗問題：
Caused by: com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method subscribe in the service com.alibab
a.dubbo.registry.RegistryService. Tried 3 times of the providers[172.168.1.167:2181] (1/1) from the registry
172.168.1.167:2181 on the consumer 169.254.249.102 using the dubbo version2.4.9. Last error is: Invoke remote
method timeout.
解決方法
這個是由於dubbo介面中的的傳輸物件沒有被序列化而導致的，只需要要檢查dubbo介面中引數中的實體類實現序列化（implements Serializable）就可以解決這一個異常.