Dubbo--HelloWorld

       上篇博客对Dubbo进行了大概的介绍，这篇博客介绍如何使用Dubbo，经典的HelloWorld。

     通过上篇博客我们知道，在dubbo中有一个很重要的角色是注册中心，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。

项目目录结构：

消费者：

服务者：

 

消费者端代码：

ConsumerThd.java

package com.tgb.klx.dubbo.consumer;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.tgb.klx.dubbo.server.HelloWorld;public class ConsumerThd implements Runnable {public void run() {ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationConsumer.xml" });context.start();HelloWorld helloWorld = (HelloWorld) context.getBean("demoService");String hello = helloWorld.hello("小康");System.out.println(hello);}public static void main(String[] args) {new Thread(new ConsumerThd()).start();}}

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.xsdhttp://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.tgb.klx.dubbo.server.HelloWorld"/>                                </beans> 

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.tgb.klx</groupId><artifactId>dubbo-Consumer-multicast</artifactId><version>0.0.1-SNAPSHOT</version><name>dubbo-Consumer</name>  <dependencies>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</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>  </dependencies></project>

 

服务端，即服务提供者端代码：

HelloWorld.java

package com.tgb.klx.dubbo.server;public interface HelloWorld {public String hello(String name);}

 

HelloWorldImpl.java

 

package com.tgb.klx.dubbo.server;public class HelloWorldImpl implements HelloWorld{public String hello(String name) {name=name+"小康测试";return name;}}

DubboProviderMain.java

package com.tgb.klx.dubbo.server;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();  }}

 

applicationProvider.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="hello-world" /><!-- 注册地址 --><dubbo:registry address="multicast://224.5.6.7:1234"/><dubbo:protocol name="dubbo" port="20880" />        <dubbo:service interface="com.tgb.klx.dubbo.server.HelloWorld" ref="demoService" executes="10" /><bean id="demoService" class="com.tgb.klx.dubbo.server.HelloWorldImpl" /></beans>

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.tgb.klx</groupId>  <artifactId>dubbo-Server-multicast</artifactId>  <version>0.0.1-SNAPSHOT</version>          <dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</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></dependencies></project>

运行结果：

 

       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，如下图：

部署Dubbo管理的war包到tomcat上，即可查看服务提供者与消费者信息。如下图：提供者：

 

服务消费者，如下图：

 

注：dubbo-admin.war部署在jdk1.8上会报错，使用1.7没有问题。