配置 dubbo 的Hello World
按以下步骤进行：
1.新建一个maven工程du（com.lzm du)。
2.编辑dom.xml加入依赖
项目依赖的三方库与Dubbo所依赖的版本冲突怎么办
比如，项目使用的spring与dubbo冲突，
dubbo使用的是spring2.5，
而项目中其它模块依赖的是spring3.2.10.RELEASE。
在Maven中，使用项目根pom.xml中的dependencyManagement版本仲裁解决：
<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.lzm</groupId> <artifactId>du</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <dependencies> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> </dependency> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.5.0-alpha</version> <type>pom</type> </dependency> <dependency> <groupId>com.github.sgroschupf</groupId> <artifactId>zkclient</artifactId> <version>0.1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>3.2.10.RELEASE</version> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>com.alibaba.external</groupId> <artifactId>sourceforge.spring</artifactId> <version>3.2.10.RELEASE</version> </dependency> </dependencies> </dependencyManagement> </project>
其中zkclient是zookeeper的客户端。
3.新建IHello接口
package com.lzm.du;
public interface IHello {
public String sayHello(String name);
}工程结构图：
4.实现IHello接口
package com.lzm.du;
public class Hello implements IHello {
public String sayHello(String name) {
// TODO Auto-generated method stub
return "Hello " + name;
}
}5.在src/main/resources/里新增provider.xml文件，配置provider。
<?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">
<!-- Application name -->
<dubbo:application name="hello-world-app" />
<!-- registry address, used for service to register itself -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- expose this service through dubbo protocol, through port 20880 -->
<dubbo:protocol name="dubbo" port="20880" />
<!-- which service interface do we expose? -->
<dubbo:service interface="com.lzm.du.IHello" ref="helloService" />
<!-- designate implementation -->
<bean id="helloService" class="com.lzm.du.Hello" />
</beans>6.新建Provider
package com.lzm.du;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Provider {
public static void main(String[] args) throws Exception {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"provider.xml"});
context.start();
System.out.println("Press any key to exit.");
System.in.read();
}
}7.在src/main/resources/里新增consumer.xml文件，配置consumer。
<?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">
<!-- consumer application name -->
<dubbo:application name="consumer-of-helloworld-app" />
<!-- registry address, used for consumer to discover services -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- which service to consume? -->
<dubbo:reference id="helloService" interface="com.lzm.du.IHello" />
</beans>8.新建Consumer
package com.lzm.du;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Consumer {
public static void main(String[] args) throws Exception {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"consumer.xml"});
context.start();
IHello helloService = (IHello)context.getBean("helloService"); // get service invocation proxy
String result = helloService.sayHello("world"); // do invoke!
System.out.println(result); // cool, how are you~
}
}9.在src/main/resources/里新增dubbo.properties
dubbo.application.name=foo dubbo.application.owner=bar dubbo.registry.address=zookeeper://127.0.0.1:2181
该文件是全局配置文件，因为现在provider.xml, consumer.xml没引用它定义的属性，所以暂时没用上。
10.下载zookeeper
http://apache.fayea.com/apache-mirror/zookeeper/zookeeper-3.5.0-alpha/zookeeper-3.5.0-alpha.tar.gz
11.启动zookeeper服务器。
解压zookeeper-3.5.0-alpha.tar.gz，将zookeeper-3.5.0-alpha\conf\zoo_sample.cfg改名为zoo.cfg。双击
zookeeper-3.5.0-alpha\bin\zkServer.cmd。
12.运行Provider
13.运行Consumer
以上就可以跑了。
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接下来配置monitor
14.下载monitor
http://download.csdn.net/download/nrs12345/7412165
解压后，将dubbo文件夹复制到tomcat的webapps下面，修改sever.xml，在<Host 节点增加：
<Context path="" debug="0" docBase="dubbo" reloadable="true"/>
这样就可以通过 http://localhost:8180/ 访问，而不是http://locahost:8180/dubbo。
使用前面的url访问正常，使用后面的url访问时，会出现很多找不到页面的错误。
当然，把dubbo文件夹里面的文件复制到ROOT下面也可以。
15.修改WEB-INF/dubbo.properties，
dubbo.registry.address=zookeeper://127.0.0.1:2181
dubbo.admin.root.password=root
dubbo.admin.guest.password=guest
第1个是zookeeper的地址，后面两个是访问monitor时要求登录的账号，root/root, guest/guest。
16.启动tomat，访问http://localhost:8180/ 。
在https://github.com/alibaba/dubbo，点击右下角的‘Download ZIP'，下载后解压，然后进入dubbo-master，执行 mvn clean install -Dmaven.test.skip进行install，然后进入dubbo-simple\dubbo-monitor-simple\target\,解压dubbo-monitor-simple-2.5.4-SNAPSHOT-assembly.tar.gz得到dubbo-monitor-simple-2.5.4-SNAPSHOT-assembly。进入dubbo-simple\dubbo-monitor-simple\target\dubbo-monitor-simple-2.5.4-SNAPSHOT-assembly\dubbo-monitor-simple-2.5.4-SNAPSHOT\conf，修改dubbo.properties，将dubbo.registry.address=multicast://224.5.6.7:1234 改成dubbo.registry.address=zookeeper://127.0.0.1:2181。
进入上级的bin，执行start.bat，打开http://127.0.0.1:8080，就能看到monitor的页面了。
<dubbo:monitor protocol="registry" />