搭建简单的Dubbo实例

简单的Dubbo框架搭建过程,包括Dubbo所依赖的zookeeper安装。

一.安装zookeeper

    1.下载zookeeper的安装包

        下载地址为:https://mirrors.cnnic.cn/apache/zookeeper/

        可从链接内选择一个合适的版本下载,我所使用的版本是zookeeper-3.4.10

    2.解压下载的压缩包,修改配置文件

        修改目录下zookeeper-3.4.10\conf\zoo_sample.cfg文件内容,并将文件名修改为zoo.cfg。

        实际上只需要修改dataDir和dataLogDir两个地方即可,dataDir为Zookeeper 保存数据的目录,dataLogDir为Zookeeper 保存日志文件的目录

          以下为我的配置文件,可以参考。

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
# 需要更改的地方
dataDir=W:/Dubbo/zookeeper/data
dataLogDir=W:/Dubbo/zookeeper/log
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

    3.启动zookeeper

        找到目录\zookeeper-3.4.10\bin,双击zkServer.cmd,直接运行;这种方法遇到问题会闪退。

         打开cmd,进入到\zookeeper-3.4.10\bin目录下,运行zkServer.cmd。

    4.启动zookeeper时的一些问题。

        若双击zkServer.cmd出现闪退,可以使用第二种启动方法,或者在编辑zkServer.cmd在文末添加pause,来查找问题。

    1.报错,缺失zoo.cfg

            搭建简单的Dubbo实例_第1张图片

    这个错是因为没有将conf/zoo_sample.cfg改名为zoo.cfg,改名之后即可解决。

    2.JAVA_HOME没有设置

        

        需要在环境变量的用户变量里添加JAVA_HOME,添加方法就不赘述了。

二.创建maven项目

    1.一共分三个模块,每个模块都有独立的pom文件。

            稍微说明一下三个模块的作用。api内为公用接口,consumer调用远程服务,provider提供远程服务。

    搭建简单的Dubbo实例_第2张图片

2.在consumer和provider的pom中添加依赖

    
    	
    		com.alibaba
    		dubbo
    		2.6.0
    	
        
            com.alibaba
            dubbo-demo-api
            2.6.1
        
        
            com.101tec
            zkclient
            0.9
        
    

3.在dubbo-demo-api内添加接口

    

public interface DemoService {

    String sayHello(String name);

}

4..在dubbo-demo-provider内实现接口

public class DemoServiceImpl implements DemoService {

    public String sayHello(String name) {
        System.out.println("[" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + "] Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
        return "Hello " + name + ", response form provider: " + RpcContext.getContext().getLocalAddress();
    }

}

修改配置文件


配置文件的内容为:




    
    

    
    
    

    
    

    
    

    
    

启动服务,注意要先启动zookeeper

public class Provider {

    public static void main(String[] args) throws Exception {
        //Prevent to get IPV6 address,this way only work in debug mode
        //But you can pass use -Djava.net.preferIPv4Stack=true,then it work well whether in debug mode or not
//        System.setProperty("java.net.preferIPv4Stack", "true");         
    	ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"META-INF/spring/dubbo-demo-provider.xml"});
        context.start();
        System.out.println("----------------服务已启动,按任意键结束···········--------------------");
        System.in.read(); // press any key to exit
    }

}

5.在dubbo-demo-consumer内调用服务

public class Consumer {

    public static void main(String[] args) {
        System.setProperty("java.net.preferIPv4Stack", "true");
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"META-INF/spring/dubbo-demo-consumer.xml"});
        context.start();
        DemoService demoService = (DemoService) context.getBean("demoService"); // get remote service proxy

        while (true) {
            try {
                Thread.sleep(1000);
                String hello = demoService.sayHello("world"); // call remote method
                System.out.println(hello); // get result

            } catch (Throwable throwable) {
                throwable.printStackTrace();
            }

        }

    }
}

修改配置文件


下面是配置文件内容,注意registry的地址,按照需求修改。





    
    

    
    
    

    
    

三.运行项目

    先启动zookeeper,启动成功后启动provider,最后启动consumer

    运行结果部分截图如下:

    

我只是写了一下我的搭建过程,如果想要更详细的了解请去看大神写的博文。

参考:http://blog.csdn.net/noaman_wgs/article/details/70214612/

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