dubbo入门示例
目测很多公司，特别是互联网公司，更特别的是电商公司，很多都在使用dubbo作为服务框架，在网上找了例子，看看dubbo的简单使用。
看起来调用的方式和rmi和web service是类似的，具体深入点的区别还不是很了解，另外一点，网上很多教程都是基于maven的，看样子maven的使用真的是越来越广泛了，不使用maven，很多例子都难以下手，至于maven就不赘述了。
这个例子就是基于zookeeper + maven + dubbo + spring的例子
首先看一下运行结果：
启动zookeeper:
接着启动dubbo的服务端：
最后启动dubbo的客户端，调用服务端的服务：
客户端日志：
接收客户端请求后，返回响应时服务端的日志：
整个的调用过程就是如此~！
下面看一下例子的搭建过程：
首先是zookeeper的搭建
这个我也是刚接触，可以百度相关教程，总体来说，简单的配置和启动不难。
下载zookeeper，解压到某路径下，如图：
文件夹下的conf子文件夹是配置文件所在路径，
主要是将zoo_sample.cfg复制一份修改为zoo.cfg，然后修改其中的配置：
然后直接在子文件夹bin中双击启动
启动完毕
服务端搭建
服务端截图：
代码如下：
pom.xml
1 <project xmlns="http://maven.apache.org/POM/4.0.0" 2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 4 http://maven.apache.org/maven-v4_0_0.xsd"> 5 6 <modelVersion>4.0.0</modelVersion> 7 8 <groupId>com.mor.maven</groupId> 9 <artifactId>dubboserver</artifactId> 10 <version>0.0.1</version> 11 <packaging>jar</packaging> 12 13 <name>dubboserver</name> 14 <url>http://maven.apache.org</url> 15 16 <properties> 17 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 18 <spring.version>3.2.13.RELEASE</spring.version> 19 <slf4j.version>1.6.6</slf4j.version> 20 </properties> 21 22 <dependencies> 23 <dependency> 24 <groupId>junit</groupId> 25 <artifactId>junit</artifactId> 26 <version>3.8.1</version> 27 <scope>test</scope> 28 </dependency> 29 <!-- Spring --> 30 <dependency> 31 <groupId>org.springframework</groupId> 32 <artifactId>spring-aop</artifactId> 33 <version>${spring.version}</version> 34 </dependency> 35 <dependency> 36 <groupId>org.springframework</groupId> 37 <artifactId>spring-core</artifactId> 38 <version>${spring.version}</version> 39 </dependency> 40 <dependency> 41 <groupId>org.springframework</groupId> 42 <artifactId>spring-beans</artifactId> 43 <version>${spring.version}</version> 44 </dependency> 45 <dependency> 46 <groupId>org.springframework</groupId> 47 <artifactId>spring-context</artifactId> 48 <version>${spring.version}</version> 49 </dependency> 50 <dependency> 51 <groupId>org.springframework</groupId> 52 <artifactId>spring-expression</artifactId> 53 <version>${spring.version}</version> 54 </dependency> 55 <!-- spring end --> 56 <!-- log --> 57 <dependency> 58 <groupId>log4j</groupId> 59 <artifactId>log4j</artifactId> 60 <version>1.2.16</version> 61 </dependency> 62 <dependency> 63 <groupId>org.slf4j</groupId> 64 <artifactId>slf4j-api</artifactId> 65 <version>${slf4j.version}</version> 66 </dependency> 67 <dependency> 68 <groupId>org.slf4j</groupId> 69 <artifactId>slf4j-log4j12</artifactId> 70 <version>${slf4j.version}</version> 71 </dependency> 72 <!-- dubbo --> 73 <dependency> 74 <groupId>com.alibaba</groupId> 75 <artifactId>dubbo</artifactId> 76 <version>2.5.3</version> 77 </dependency> 78 <!-- zkclient --> 79 <dependency> 80 <groupId>com.github.sgroschupf</groupId> 81 <artifactId>zkclient</artifactId> 82 <version>0.1</version> 83 </dependency> 84 <!-- zookeeper --> 85 <dependency> 86 <groupId>org.apache.zookeeper</groupId> 87 <artifactId>zookeeper</artifactId> 88 <version>3.4.5</version> 89 </dependency> 90 </dependencies> 91 92 <build> 93 <finalName>dubbo-demo</finalName> 94 <plugins> 95 <plugin> 96 <groupId>org.apache.maven.plugins</groupId> 97 <artifactId>maven-compiler-plugin</artifactId> 98 <version>2.1</version> 99 <configuration> 100 <source>1.5</source> 101 <target>1.5</target> 102 <encoding>UTF-8</encoding> 103 <failOnError>false</failOnError> 104 </configuration> 105 </plugin> 106 </plugins> 107 </build> 108 </project>
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-app" /> <!-- 本机 伪集群 测试 --> <dubbo:registry protocol="zookeeper" address="192.168.10.171:2181" /> <dubbo:protocol name="dubbo" port="20880" /> <dubbo:service interface="com.mor.server.dubbo.service.DemoServer" ref="demoService" /> <!-- 和本地bean一样实现服务 --> <bean id="demoService" class="com.mor.server.dubbo.service.DemoServerImpl" /> </beans>
log4j.properties
log4j.appender.Stdout=org.apache.log4j.ConsoleAppender log4j.appender.Stdout.layout=org.apache.log4j.PatternLayout log4j.appender.Stdout.layout.conversionPattern=%-5p - %-26.26c{1} - %m\n log4j.rootLogger=INFO,Stdout log4j.logger.org.apache.wicket=INFO log4j.logger.org.apache.wicket.protocol.http.HttpSessionStore=INFO log4j.logger.org.apache.wicket.version=INFO log4j.logger.org.apache.wicket.RequestCycle=INFO
ServerMain.java
package com.mor.main; import java.io.IOException; import org.springframework.context.support.ClassPathXmlApplicationContext; public class ServerMain { public static void main(String[] args) throws IOException { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "applicationProvider.xml" }); context.start(); System.out.println("按任意键退出"); System.in.read(); } }
DemoServer.java
package com.mor.server.dubbo.service; public interface DemoServer { String sayHello(String str); }
DemoServerImpl.java
package com.mor.server.dubbo.service; import java.util.Date; public class DemoServerImpl implements DemoServer { public String sayHello(String str) { System.out.println("服务端-2-:接收到客户端请求为：[" + str + "]"); String respStr = "你好 ,当前时间为:" + new Date(); System.out.println("服务端-3-:返回客户端信息：[" + respStr + "]"); return respStr; } }
客户端搭建
工程截图：
pom.xml
1 <project xmlns="http://maven.apache.org/POM/4.0.0" 2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 4 http://maven.apache.org/maven-v4_0_0.xsd"> 5 6 <modelVersion>4.0.0</modelVersion> 7 <groupId>ClientMaven</groupId> 8 <artifactId>Client</artifactId> 9 <version>0.0.1-SNAPSHOT</version> 10 <name>dubboClient</name> 11 <url>http://maven.apache.org</url> 12 13 <properties> 14 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 15 <spring.version>3.2.13.RELEASE</spring.version> 16 <slf4j.version>1.6.6</slf4j.version> 17 </properties> 18 19 <dependencies> 20 <dependency> 21 <groupId>junit</groupId> 22 <artifactId>junit</artifactId> 23 <version>3.8.1</version> 24 <scope>test</scope> 25 </dependency> 26 <!-- Spring --> 27 <dependency> 28 <groupId>org.springframework</groupId> 29 <artifactId>spring-aop</artifactId> 30 <version>${spring.version}</version> 31 </dependency> 32 <dependency> 33 <groupId>org.springframework</groupId> 34 <artifactId>spring-core</artifactId> 35 <version>${spring.version}</version> 36 </dependency> 37 <dependency> 38 <groupId>org.springframework</groupId> 39 <artifactId>spring-beans</artifactId> 40 <version>${spring.version}</version> 41 </dependency> 42 <dependency> 43 <groupId>org.springframework</groupId> 44 <artifactId>spring-context</artifactId> 45 <version>${spring.version}</version> 46 </dependency> 47 <dependency> 48 <groupId>org.springframework</groupId> 49 <artifactId>spring-expression</artifactId> 50 <version>${spring.version}</version> 51 </dependency> 52 <!-- spring end --> 53 <!-- log --> 54 <dependency> 55 <groupId>log4j</groupId> 56 <artifactId>log4j</artifactId> 57 <version>1.2.16</version> 58 </dependency> 59 <dependency> 60 <groupId>org.slf4j</groupId> 61 <artifactId>slf4j-api</artifactId> 62 <version>${slf4j.version}</version> 63 </dependency> 64 <dependency> 65 <groupId>org.slf4j</groupId> 66 <artifactId>slf4j-log4j12</artifactId> 67 <version>${slf4j.version}</version> 68 </dependency> 69 <!-- dubbo --> 70 <dependency> 71 <groupId>com.alibaba</groupId> 72 <artifactId>dubbo</artifactId> 73 <version>2.5.3</version> 74 </dependency> 75 <!-- zkclient --> 76 <dependency> 77 <groupId>com.github.sgroschupf</groupId> 78 <artifactId>zkclient</artifactId> 79 <version>0.1</version> 80 </dependency> 81 <!-- zookeeper --> 82 <dependency> 83 <groupId>org.apache.zookeeper</groupId> 84 <artifactId>zookeeper</artifactId> 85 <version>3.4.5</version> 86 </dependency> 87 </dependencies> 88 89 <build> 90 <finalName>dubbo-demo</finalName> 91 <plugins> 92 <plugin> 93 <groupId>org.apache.maven.plugins</groupId> 94 <artifactId>maven-compiler-plugin</artifactId> 95 <version>2.1</version> 96 <configuration> 97 <source>1.5</source> 98 <target>1.5</target> 99 <encoding>UTF-8</encoding> 100 <failOnError>false</failOnError> 101 </configuration> 102 </plugin> 103 </plugins> 104 </build> 105 </project> 106
该pom.xml和服务端的依赖基本一致
ClientMain.java
package com.mor.client.dubbo.main; import com.mor.client.dubbo.action.ChatAction; public class ClientMain { public static void main(String[] args) { ChatAction act = new ChatAction(); act.SayHello(); } }
ChatAction.java
package com.mor.client.dubbo.action; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.mor.server.dubbo.service.DemoServer; public class ChatAction { public void SayHello() { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "applicationConsumer.xml" }); context.start(); DemoServer demoServer = (DemoServer) context.getBean("demoService"); String reqStr = "我是客户端参数：[当前时间是多少?]"; System.out.println("客户端-1-：开始发起请求，请求参数为：" + reqStr); System.out.println("客户端-4-：接收到服务端信息为[" + demoServer.sayHello(reqStr) + "]"); } }
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"> <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 --> <dubbo:application name="consumer-of-helloworld-app" /> <!-- 使用本地伪集群注册中心暴露发现服务地址 --> <dubbo:registry protocol="zookeeper" address="192.168.10.171:2181" /> <!-- 生成远程服务代理，可以和本地bean一样使用demoService --> <dubbo:reference id="demoService" interface="com.mor.server.dubbo.service.DemoServer" /> </beans>
由于客户端需要调用服务端，所以可以采取工程依赖和jar包依赖两种
工程依赖：
在myeclipse里面，右击Client-->Build path-->Configure build path
然后选择Projects，选择服务端
或者把服务端打成jar包，然后客户端直接引用。
至此，全部过程就搭建完毕，运行的时候依次启动：
1.zookeeper
2.服务端
3.客户端
即可得到最开始结果。
几个注意的问题：
如果applicationProvider.xml的dubbo标签打红叉，可以自行百度myeclipse的xsd的引用
可参见：http://vickya.iteye.com/blog/1113277
注意xml配置文件中的ip和端口
此例子主要是借鉴此文：http://blog.csdn.net/morning99/article/details/40426781
加油学习~！
