dubbo简单入门（helloworld例子）
Dubbo现在支持的有三种方式：
1.multicast；
2.zookeeper；
3.redis
下面的Demo使用的是multicast方式。
提供者项目结构：
消费者项目结构：
服务端：
pom.xml配置
<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.ming</groupId><artifactId>dubboserver</artifactId><version>0.0.1-SNAPSHOT</version><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId><version>1.1.1</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.5.3</version></dependency><dependency><groupId>org.javassist</groupId><artifactId>javassist</artifactId><version>3.15.0-GA</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><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.1.6.RELEASE</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.5</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.6.1</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.3.6</version></dependency><dependency><groupId>com.github.adyliu</groupId><artifactId>zkclient</artifactId><version>2.0</version></dependency><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>0.4</version></dependency></dependencies></project>1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889
applicationProvider.xml配置:
<?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="hello-world" /><!-- 注册地址 --><dubbo:registry address="multicast://224.5.6.7:1234"/><!-- <dubbo:registry address="127.0.0.1:2181" protocol="zookeeper"/> --><dubbo:protocol name="dubbo" port="20880" /><bean id="demoService" class="com.ming.dubboserver.HelloWorldImpl" /><dubbo:service interface="com.ming.dubboserver.HelloWorld" ref="demoService" executes="10" /></beans>12345678910111213
helloworld接口：
package com.ming.dubboserver;public interface HelloWorld {public String hello(String name);}123456
helloworld实现类
package com.ming.dubboserver;public class HelloWorldImpl implements HelloWorld {public String hello(String name) {name = name + "小明测试";return name;}}123456789101112
服务启动类：
package com.ming.dubboserver;import java.io.IOException;import org.springframework.context.support.ClassPathXmlApplicationContext;public class DubboProviderMain {public static void main(String[] args) throws IOException {ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationProvider.xml" });context.start();System.out.println("Press any key to exit.");System.in.read();}}1234567891011121314151617
客户端：
pom.xml
<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.ming</groupId><artifactId>dubboconsumer</artifactId><version>0.0.1-SNAPSHOT</version><name>dubboconsumer</name><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId><version>1.1.1</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.5.3</version></dependency><dependency><groupId>org.javassist</groupId><artifactId>javassist</artifactId><version>3.15.0-GA</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><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.1.6.RELEASE</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.5</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.6.1</version></dependency><dependency><groupId>com.github.adyliu</groupId><artifactId>zkclient</artifactId><version>2.0</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.3.6</version></dependency><dependency><groupId>com.ming</groupId><artifactId>dubboserver</artifactId><version>0.0.1-SNAPSHOT</version></dependency></dependencies></project>12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485
applicationConsumer.xml
<?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="consumer-of-helloworld-app" /><dubbo:registry address="multicast://224.5.6.7:1234" /><dubbo:reference id="demoService" interface="com.ming.dubboserver.HelloWorld" /></beans>123456789
测试类：
package com.ming.dubboconsumer;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.ming.dubboserver.HelloWorld;public class ConsumerThd implements Runnable {public void run() {ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationConsumer.xml" });context.start();context.getBean("demoService");HelloWorld helloWorld = (HelloWorld) context.getBean("demoService");String hello = helloWorld.hello("小明");System.out.println(hello);System.out.println("执行完毕");}public static void main(String[] args) {new Thread(new ConsumerThd()).start();}}1234567891011121314151617181920212223
还有一种方式是将Zookeeper作为注册中心，需要下载并安装zookeeper。将配置文件中的注册中心修改为如下即可：
其他代码不用修改，推荐使用zookeeper作为注册中心。如此可以通过Dubbo+注册中心实现分布式服务。服务消费者不用知道服务的具体位置，只要知道注册中心位置即可，消费者只要能消费，不用管消费的是哪的服务，服务提供方与服务消费方解耦。
使用zookeeper注册中心，与dubbo结合，可以查看服务提供者和消费者的信息，将dubbo管理的war包部署到tomcat上，查看服务提供者
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