初学：用dubbo和zookeeper来实现十分简单的项目之间远程调用

zookeeper官方下载地址：https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.4.13/ ，下载好后，先将conf文件夹下的 zoo-sample.cfg重命名为zoo.cfg，同时系统环境中要配置JAVA_HOME

  • dubbo-server项目

新建一个maven项目“dubbo-server”，建好相应的包，最终目录结构如下：


dubbo-server项目目录结构

pom.xml中的依赖如下：

<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.eduask</groupId>
  <artifactId>dubbo-server</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
   <name>server</name>  
    <url>http://maven.apache.org</url>  
  
    <properties>  
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
    </properties>  
  
    <dependencies>  
        <!-- spring begin -->  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-context</artifactId>  
            <version>4.1.6.RELEASE</version>  
        </dependency>  
        <!-- spring end -->  
  
        <!-- dubbo begin -->  
        <dependency>  
            <groupId>com.alibaba</groupId>  
            <artifactId>dubbo</artifactId>  
            <version>2.5.3</version>  
        </dependency>  
        <!-- dubbo end -->  
  
        <!-- 注册中心zookeeper begin -->  
        <dependency>  
            <groupId>org.apache.zookeeper</groupId>  
            <artifactId>zookeeper</artifactId>  
            <version>3.3.6</version>  
        </dependency>  
        <!-- 注册中心zookeeper end -->  
  
        <!-- log begin -->  
        <dependency>  
            <groupId>commons-logging</groupId>  
            <artifactId>commons-logging</artifactId>  
            <version>1.1.1</version>  
        </dependency>  
        <dependency>  
            <groupId>log4j</groupId>  
            <artifactId>log4j</artifactId>  
            <version>1.2.15</version>  
            <exclusions>  
                <exclusion>  
                    <groupId>com.sun.jdmk</groupId>  
                    <artifactId>jmxtools</artifactId>  
                </exclusion>  
                <exclusion>  
                    <groupId>com.sun.jmx</groupId>  
                    <artifactId>jmxri</artifactId>  
                </exclusion>  
                <exclusion>  
                    <artifactId>jms</artifactId>  
                    <groupId>javax.jms</groupId>  
                </exclusion>  
                <exclusion>  
                    <artifactId>mail</artifactId>  
                    <groupId>javax.mail</groupId>  
                </exclusion>  
            </exclusions>  
        </dependency>  
        <!-- log end -->  
          
        <!-- other begin -->  
        <dependency>  
            <groupId>org.jboss.netty</groupId>  
            <artifactId>netty</artifactId>  
            <version>3.2.0.Final</version>  
        </dependency>  
        <dependency>  
            <groupId>com.101tec</groupId>  
            <artifactId>zkclient</artifactId>  
            <version>0.8</version>  
        </dependency>  
        <!-- other end -->  
    </dependencies>
</project>

在source资源文件夹下的applicationProvider.xml配置如下：

<?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 ">  
    
    <dubbo:application name="dubbo-demo" />  
    <!-- zookeeper注册中心 -->      
    <!-- 通过zookeeper配置发布地址和zookeeper调度端口，其他的项目来访问本项目的接口时，都统一走这个调度端口 -->
    <!-- 如果有多个项目互相调用，那么被调用的项目都要配置一个zookeeper -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />  
    <!-- 通过dubbo，将接口暴露在20880端口 -->
    <dubbo:protocol name="dubbo" port="20880" />  
      
    <!-- 和本地bean一样实现服务 -->   
    <bean id="demoService" class="com.eduask.service.imp.DemoServiceImp" />  
  
    <!-- 向注册中心注册暴漏服务地址,注册服务，3000代表超时时间 -->  
    <dubbo:service interface="com.eduask.service.DemoService" ref="demoService" executes="3000" /> 
  
</beans>

在service包下写接口DemoService.java：

package com.eduask.service;

public interface DemoService {
    public String getHello(String name);
}

和实现类DemoServiceImpl.java：

package com.eduask.service.imp;

import com.eduask.service.DemoService;

public class DemoServiceImp implements DemoService {
    @Override
    public String getHello(String name) {
        return "hello"+name;
    }
}

test包下新建Test.java

package com.eduask.test;

import java.io.IOException;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"applicationProvider.xml"});
        context.start();
        System.out.println("输入任意按键退出 ~ ");
        System.in.read();
        context.close();
    }
}

此时可以先试试服务能不能跑了，先到zookeeper的bin目录下，运行 zkServer.cmd ，将zookeeper的服务跑起来，再运行这个项目中的Test.java，控制台打印：

log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
输入任意按键退出 ~

  • dubbo-client项目

新建一个maven项目“dubbo-client”，建好相应的包，最终目录结构如下：


dubbo-client项目目录结构

pom.xml中的依赖如下：

<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.eduask</groupId>
  <artifactId>dubbo-client</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
   <name>client</name>  
    <url>http://maven.apache.org</url>  
  
    <properties>  
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
    </properties>  
  
    <dependencies>  
        <!-- spring begin -->  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-context</artifactId>  
            <version>4.1.6.RELEASE</version>  
        </dependency>  
        <!-- spring end -->  
  
        <!-- dubbo begin -->  
        <dependency>  
            <groupId>com.alibaba</groupId>  
            <artifactId>dubbo</artifactId>  
            <version>2.5.3</version>  
        </dependency>  
        <!-- dubbo end -->  
  
        <!-- 注册中心zookeeper begin -->  
        <dependency>  
            <groupId>org.apache.zookeeper</groupId>  
            <artifactId>zookeeper</artifactId>  
            <version>3.3.6</version>  
        </dependency>  
        <!-- 注册中心zookeeper end -->  
  
        <!-- log begin -->  
        <dependency>  
            <groupId>log4j</groupId>  
            <artifactId>log4j</artifactId>  
            <version>1.2.15</version>  
            <exclusions>  
                <exclusion>  
                    <groupId>com.sun.jdmk</groupId>  
                    <artifactId>jmxtools</artifactId>  
                </exclusion>  
                <exclusion>  
                    <groupId>com.sun.jmx</groupId>  
                    <artifactId>jmxri</artifactId>  
                </exclusion>  
                <exclusion>  
                    <artifactId>jms</artifactId>  
                    <groupId>javax.jms</groupId>  
                </exclusion>  
                <exclusion>  
                    <artifactId>mail</artifactId>  
                    <groupId>javax.mail</groupId>  
                </exclusion>  
            </exclusions>  
        </dependency>  
        <!-- log end -->  
  
        <!-- other begin -->  
        <dependency>  
            <groupId>com.101tec</groupId>  
            <artifactId>zkclient</artifactId>  
            <version>0.8</version>  
        </dependency>  
       
        <dependency>  
            <groupId>com.eduask</groupId>  
            <artifactId>dubbo-server</artifactId>  
            <version>0.0.1-SNAPSHOT</version>  
        </dependency>  
        <!-- other end -->  
    </dependencies>
</project>

在source资源文件夹下的applicationConsumer.xml配置如下：

<?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">  
     <!-- 写这样一个服务的名字,可以在zookeeper的管理平台看见 -->
    <dubbo:application name="consumer-of-dubbo-demo" />  
     <!-- 向注册中心注册使用，访问的是目的项目的zookeeper调度端口 -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />  
  
    <!-- 向注册中心订阅服务 --> 
    <!-- 客户端拿到的是服务端提供的接口，zookeeper通过接口名来调度接口实现类 --> 
    <dubbo:reference id="demoService" interface="com.eduask.service.DemoService" />  
</beans>

最后在test包下建Test.java：

package com.eduask.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.eduask.service.DemoService;

public class Test {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(  
                new String[] { "applicationConsumer.xml" });  
        context.start();  
        DemoService service = (DemoService) context.getBean("demoService");  
        System.out.println(service.getHello(" 老王"));  
        context.close();
    }
}

运行（前提是zookeeper和dubbo-server项目没停），控制台打印：

log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
hello 老王

远程调用成功。

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