dubbo搭建-服务端开发（二）

dubbo服务端开发

本文主要写dubbo服务端的开发，最简单的dubbo环境要求，只实现dubbo服务的注册。

代码结构

dubbo_common_skeleton是接口包，里面就定义了两个接口（service/ISimple01Service和service/ISimple02Service）

dubbo_common_server是dubbo_common_skeleton的实现。

pom.xml说明

<?xml version="1.0" encoding="UTF-8"?><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.plg.dubbo</groupId><artifactId>dubbo_common</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><modules><module>dubbo_common_skeleton</module><module>dubbo_common_server</module></modules><properties><springframework.version>4.1.6.RELEASE</springframework.version><junit.version>4.4</junit.version><slf4j-log4j12.version>1.7.14</slf4j-log4j12.version><log4j.version>1.2.17</log4j.version><slf4j-api.version>1.7.7</slf4j-api.version><fastjson.version>1.2.13</fastjson.version><tiles.version>2.2.2</tiles.version></properties><dependencyManagement><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version><scope>test</scope></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>${slf4j-log4j12.version}</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>${slf4j-api.version}</version></dependency><!-- spring --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-expression</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-instrument</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>${springframework.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${springframework.version}</version></dependency><!-- spring --><dependency><groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.5.3</version><!-- 排除dubbo依赖的spring jar处理 -->            <exclusions>                <exclusion>                    <groupId>org.springframework</groupId>                    <artifactId>spring</artifactId>                </exclusion>            </exclusions></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.4.6</version></dependency><dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>0.1</version></dependency><!-- json --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>${fastjson.version}</version></dependency></dependencies></dependencyManagement><build><plugins>    <plugin>        <groupId>org.apache.maven.plugins</groupId>        <artifactId>maven-compiler-plugin</artifactId>        <version>3.3</version>        <configuration>            <source>1.8</source>            <target>1.8</target>            <encoding>UTF-8</encoding>         </configuration>    </plugin></plugins></build></project>

这是本项目完整的pom.xml文件。dubbo服务需要spring容器管理，所以需要引入spring的包。其实dubbo服务对jar的基本要求就下面几个：

dubbo.jar
log4j.jar
slf4j.jar
slf4j-log4j.jar
zkclient.jar
zookeeper.jar

这里引入这么多是为了以后创建springMVC项目使用。

dubbo_common_server的web.xml

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"><display-name>dubbo-common-server</display-name><!-- spring context listener --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener></web-app>

dubbo_common_server是一个web项目，到时候需要用web服务器启动。dubbo服务端可以是打包成jar包的形式，然后通过org.springframework.context.support.AbstractApplicationContext.start()来启动。

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:context="http://www.springframework.org/schema/context"xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><import resource="classpath:beans/beans-*.xml" /><context:component-scan base-package="com.plg.dubbo" /><!-- 激活自动代理功能 --><aop:aspectj-autoproxy proxy-target-class="true" /></beans>

context:component-scan需要spring3.1版本才能支持，但是dubbo.jar里面的spring版本是2.5，所以需要把dubbo.jar包中的spring包排除，做法就是在pom.xml引用dubbo的时候用<exclusion>标签排除：

<dependency>        <groupId>com.alibaba</groupId><artifactId>dubbo</artifactId><version>2.5.3</version><!-- 排除dubbo依赖的spring jar处理 --><exclusions>        <exclusion>                <groupId>org.springframework</groupId>                <artifactId>spring</artifactId>         </exclusion></exclusions></dependency>

dubbo服务注册配置beans-dubbo.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:jee="http://www.springframework.org/schema/jee"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsdhttp://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsdhttp://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd "default-lazy-init="false" >   <!-- 提供方应用名称信息，这个相当于起一个名字，我们dubbo管理页面比较清晰是哪个应用暴露出来的 -->   <dubbo:application name="dubbo-common-server" />   <!-- 使用zookeeper注册中心暴露服务地址 -->     <dubbo:registry address="zookeeper://192.168.233.131:2181" check="false" subscribe="false" register="" />     <!-- 要暴露的服务接口 -->   <dubbo:service interface="com.plg.dubbo.common.service.ISimple01Service" ref="simple01Service" />  <dubbo:service interface="com.plg.dubbo.common.service.ISimple02Service" ref="simple02Service" /></beans>

确保address配置的zookeeper地址和端口正确，并启动。

启动dubbo_common_server

这里用tomcat8启动，启动成功之后就可以在dubbo-admin页面上看到注册的服务（dubbo-admin安装）。

整个工程的源码：https://git.oschina.net/plg17/plg-dubbo