dubbo入门之helloWorld

dubbo官方文档：http://dubbo.apache.org/zh-cn/docs/user/quick-start.html

基于spring coloud的demo:http://start.dubbo.io

dubbo的入门实例还是不够友好啊，我折腾了半天才搞定这个入门demo，废话不说，上代码

整体的项目结构如下：

为什么有三个工程呢？

因为client作为客户端调用服务端其实是调用interface接口，而服务端实现了interface接口，所以才能调用成功，所以打包的时候要把interface单独打成一个包，client和server都需要依赖这个包。

整个流程很简单，就是启动zookeeper,然后先启动服务端，再启动客户端即可，代码如下：

interface模块：

HelloInterface.java：

package com.sawshaw.dubbo_interface;

public interface HelloInterface {

	public String sayHello(String name);

}

server模块：　　

HelloServiceImpl.java:

package com.sawshaw.dubbo_server;

import com.sawshaw.dubbo_interface.HelloInterface;

public class HelloServiceImpl implements HelloInterface{

	public String sayHello(String name) {

		System.out.println("hello server......client send name is "+name);

		return "hello "+name;

	}

}

Starter.java:

package com.sawshaw.dubbo_server;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Starter {

	public static void main(String[] args) throws Exception {

			ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(

					new String[] { "applicationContext.xml" });

			context.start();

			System.out.println("<<<<<<dubbo server程序启动完成>>>>>>");

			System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟

		}

	}

applicationContext.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:tx="http://www.springframework.org/schema/tx"

	   xmlns:aop="http://www.springframework.org/schema/aop"

	   xmlns:context="http://www.springframework.org/schema/context"

	   xsi:schemaLocation="http://www.springframework.org/schema/beans

	   http://www.springframework.org/schema/beans/spring-beans.xsd

	   http://www.springframework.org/schema/tx

	   http://www.springframework.org/schema/tx/spring-tx.xsd

	   http://www.springframework.org/schema/aop

	   http://www.springframework.org/schema/aop/spring-aop.xsd

       http://www.springframework.org/schema/context

	   http://www.springframework.org/schema/context/spring-context.xsd">

	<import resource="classpath*:provider.xml"/>

	<context:component-scan base-package="com.sawshaw.dubbo_server.*"/>

</beans>

provider.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">

    <!-- 提供方应用信息，用于计算依赖关系 -->

    <dubbo:application name="provider"/>

    <!-- 使用zookeeper注册中心暴露服务地址，这个地址是启动zookeeper默认暴露的地址 -->

    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>

    <!-- 用dubbo协议在随机端口暴露服务 端口自己设置，如果被占用了就换一个端口 -->

   <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->

    <dubbo:service interface="com.sawshaw.dubbo_interface.HelloInterface" ref="helloService"/>

    <!-- 和本地bean一样实现服务 -->

    <bean id="helloService" class="com.sawshaw.dubbo_server.HelloServiceImpl"/>

</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.sawshaw</groupId>

  <artifactId>dubbo-server</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>jar</packaging>

  <name>dubbo-server</name>

  <url>http://maven.apache.org</url>

   <properties>

  		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<spring.version>4.3.17.RELEASE</spring.version>

		<jpa.version>1.7.1.RELEASE</jpa.version>

		<log4j2.version>2.7</log4j2.version>

  </properties>

  <dependencies>

  <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->

	<dependency>

	    <groupId>org.apache.zookeeper</groupId>

	    <artifactId>zookeeper</artifactId>

	    <version>3.4.10</version>

	    <!--排除log4j必须加上-->

        <exclusions>

               <exclusion>

                   <groupId>log4j</groupId>

                   <artifactId>log4j</artifactId>

               </exclusion>

           </exclusions>

	    <type>pom</type>

	</dependency>

	<!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->

	<dependency>

	    <groupId>com.alibaba</groupId>

	    <artifactId>dubbo</artifactId>

	    <version>2.6.2</version>

	    <exclusions>

		    <exclusion>

				<groupId>org.springframework</groupId>

				<artifactId>spring</artifactId>

			</exclusion>

	        <exclusion>

	            <groupId>org.jboss.netty</groupId>

	            <artifactId>netty</artifactId>

	        </exclusion>

    	</exclusions>

	</dependency>

	<!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->

	<dependency>

	    <groupId>org.apache.curator</groupId>

	    <artifactId>curator-framework</artifactId>

	    <version>2.12.0</version>

	</dependency>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>3.8.1</version>

      <scope>test</scope>

    </dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-core</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-beans</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-context</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-context-support</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-tx</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-aop</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-web</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-webmvc</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-orm</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-jdbc</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework.data</groupId>

	    <artifactId>spring-data-jpa</artifactId>

	    <version>${jpa.version}</version>

	    <exclusions>

				<exclusion>

					<artifactId>slf4j-api</artifactId>

					<groupId>org.slf4j</groupId>

				</exclusion>

			</exclusions>

	</dependency>

    <dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-expression</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-test</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.slf4j</groupId>

	    <artifactId>slf4j-api</artifactId>

	    <version>1.7.25</version>

	</dependency>

	<!-- https://mvnrepository.com/artifact/log4j/log4j -->

	<dependency>

	    <groupId>log4j</groupId>

	    <artifactId>log4j</artifactId>

	    <version>1.2.17</version>

	</dependency>

	<!-- servlet start-->

	<dependency>

		<groupId>javax.servlet</groupId>

		<artifactId>javax.servlet-api</artifactId>

		<version>3.1.0</version>

		<scope>provided</scope>

	</dependency>

	<dependency>

		<groupId>javax.servlet.jsp</groupId>

		<artifactId>javax.servlet.jsp-api</artifactId>

		<version>2.3.1</version>

		<scope>provided</scope>

	</dependency>

	<dependency>

		<groupId>javax.servlet</groupId>

		<artifactId>jstl</artifactId>

		<version>1.2</version>

		<scope>provided</scope>

	</dependency>

	<!-- servlet end -->

	<dependency>

	    <groupId>com.alibaba</groupId>

	    <artifactId>fastjson</artifactId>

	    <version>1.2.47</version>

	</dependency>

	<dependency>

	    <groupId>org.freemarker</groupId>

	    <artifactId>freemarker</artifactId>

	    <version>2.3.23</version>

	</dependency>

  </dependencies>

  <build>

		<resources>

			<resource>

				<directory>src/main/resource</directory>

				<includes>

					<include>*.xml</include>

				</includes>

			</resource>

		</resources>

		<plugins>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-compiler-plugin</artifactId>

				<version>3.5.1</version>

				<configuration>

					<srouce>1.7</srouce>

					<target>1.7</target>

				</configuration>

			</plugin>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-shade-plugin</artifactId>

				<version>1.4</version>

				<executions>

					<execution>

						<phase>package</phase>

						<goals>

							<goal>shade</goal>

						</goals>

						<configuration>

							<transformers>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">

									<resource>META-INF/spring.handlers</resource>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

									<mainClass>com.sawshaw.dubbo_server.Starter</mainClass>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">

									<resource>META-INF/spring.schemas</resource>

								</transformer>

							</transformers>

						</configuration>

					</execution>

				</executions>

			</plugin>

		</plugins>

	</build>

</project>

client模块：

　HelloClient.java：

package com.sawshaw.dubbo_client;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.sawshaw.dubbo_interface.HelloInterface;

public class HelloClient{

	public static void main(String[] args) {

		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

		HelloInterface hs = (HelloInterface) context.getBean("helloService");

        String result = hs.sayHello("dubbo");

        System.out.println( "client output...."+result);

	}

}

applicationContext.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:tx="http://www.springframework.org/schema/tx"

	   xmlns:aop="http://www.springframework.org/schema/aop"

	   xmlns:context="http://www.springframework.org/schema/context"

	   xsi:schemaLocation="http://www.springframework.org/schema/beans

	   http://www.springframework.org/schema/beans/spring-beans.xsd

	   http://www.springframework.org/schema/tx

	   http://www.springframework.org/schema/tx/spring-tx.xsd

	   http://www.springframework.org/schema/aop

	   http://www.springframework.org/schema/aop/spring-aop.xsd

       http://www.springframework.org/schema/context

	   http://www.springframework.org/schema/context/spring-context.xsd">

	<import resource="classpath*:consumer.xml"/>

	<context:component-scan base-package="com.sawshaw.dubbo_client.*"/>

</beans>

　consumer.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"/>

    <!-- 连接注册中心配置 -->

    <dubbo:registry address="zookeeper://127.0.0.1:2181" protocol="zookeeper" check="false"/>

    <!-- 生成远程服务代理，可以和本地bean一样使用helloService -->

    <dubbo:reference id="helloService" interface="com.sawshaw.dubbo_interface.HelloInterface"/>

</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.sawshaw</groupId>

  <artifactId>dubbo-client</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>jar</packaging>

  <name>dubbo-client</name>

  <url>http://maven.apache.org</url>

   <properties>

  		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<spring.version>4.3.17.RELEASE</spring.version>

		<jpa.version>1.7.1.RELEASE</jpa.version>

		<log4j2.version>2.7</log4j2.version>

  </properties>

  <dependencies>

	<!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->

	<dependency>

	    <groupId>org.apache.zookeeper</groupId>

	    <artifactId>zookeeper</artifactId>

	    <version>3.4.10</version>

	    <!--排除log4j必须加上-->

        <exclusions>

               <exclusion>

                   <groupId>log4j</groupId>

                   <artifactId>log4j</artifactId>

               </exclusion>

           </exclusions>

	    <type>pom</type>

	</dependency>

	<!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->

	<dependency>

	    <groupId>com.alibaba</groupId>

	    <artifactId>dubbo</artifactId>

	    <version>2.6.2</version>

	    <exclusions>

		    <exclusion>

				<groupId>org.springframework</groupId>

				<artifactId>spring</artifactId>

			</exclusion>

	        <exclusion>

	            <groupId>org.jboss.netty</groupId>

	            <artifactId>netty</artifactId>

	        </exclusion>

    	</exclusions>

	</dependency>

	<!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->

	<dependency>

	    <groupId>org.apache.curator</groupId>

	    <artifactId>curator-framework</artifactId>

	    <version>2.12.0</version>

	</dependency>

      <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>3.8.1</version>

      <scope>test</scope>

    </dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-core</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-beans</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-context</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-context-support</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-tx</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-aop</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-web</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-webmvc</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-orm</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-jdbc</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework.data</groupId>

	    <artifactId>spring-data-jpa</artifactId>

	    <version>${jpa.version}</version>

	    <exclusions>

				<exclusion>

					<artifactId>slf4j-api</artifactId>

					<groupId>org.slf4j</groupId>

				</exclusion>

			</exclusions>

	</dependency>

    <dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-expression</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.springframework</groupId>

	    <artifactId>spring-test</artifactId>

	    <version>${spring.version}</version>

	</dependency>

	<dependency>

	    <groupId>org.slf4j</groupId>

	    <artifactId>slf4j-api</artifactId>

	    <version>1.7.25</version>

	</dependency>

		<dependency>

	    <groupId>log4j</groupId>

	    <artifactId>log4j</artifactId>

	    <version>1.2.17</version>

	</dependency>

	<!-- servlet start-->

	<dependency>

		<groupId>javax.servlet</groupId>

		<artifactId>javax.servlet-api</artifactId>

		<version>3.1.0</version>

		<scope>provided</scope>

	</dependency>

	<dependency>

		<groupId>javax.servlet.jsp</groupId>

		<artifactId>javax.servlet.jsp-api</artifactId>

		<version>2.3.1</version>

		<scope>provided</scope>

	</dependency>

	<dependency>

		<groupId>javax.servlet</groupId>

		<artifactId>jstl</artifactId>

		<version>1.2</version>

		<scope>provided</scope>

	</dependency>

	<!-- servlet end -->

	<dependency>

	    <groupId>com.alibaba</groupId>

	    <artifactId>fastjson</artifactId>

	    <version>1.2.47</version>

	</dependency>

	<dependency>

	    <groupId>org.freemarker</groupId>

	    <artifactId>freemarker</artifactId>

	    <version>2.3.23</version>

	</dependency>

  </dependencies>

  	<build>

		<resources>

			<resource>

				<directory>src/main/resource</directory>

				<includes>

					<include>*.xml</include>

				</includes>

			</resource>

		</resources>

		<plugins>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-compiler-plugin</artifactId>

				<version>3.5.1</version>

				<configuration>

					<srouce>1.7</srouce>

					<target>1.7</target>

				</configuration>

			</plugin>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-shade-plugin</artifactId>

				<version>1.4</version>

				<executions>

					<execution>

						<phase>package</phase>

						<goals>

							<goal>shade</goal>

						</goals>

						<configuration>

							<transformers>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">

									<resource>META-INF/spring.handlers</resource>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

									<mainClass>com.sawshaw.dubbo_client.HelloClient</mainClass>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">

									<resource>META-INF/spring.schemas</resource>

								</transformer>

							</transformers>

						</configuration>

					</execution>

				</executions>

			</plugin>

		</plugins>

	</build>

</project>

需要注意的几点：pom记得把dubbo的netty依赖和spring依赖去掉,把zookeeper去掉log4j依赖。　

链接：https://pan.baidu.com/s/1AWlWAmzQyAFFAdhqvzhEvw 密码：9jz3

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