duboo注解使用详解

一、背景

随着互联网的发展，网站应用的规模不断扩大，常规的垂直应用架构已无法应对，分布式服务架构以及流动计算架构势在必行。

当越来越的的接口与实现类的增加后，duboo的xml配置会越来越多，为了防止几百几千行的代码，减少开发人员配置xml的工作量，使用duboo的注解模式，减少配置多出问题多的可能性！

二、Dubbo使用案例

Duboo注解

接口类项目：DubboServiceInterface

仅仅是一个接口类项目！接口是普通接口！

注意：将接口类项目打包成jar分别放入服务端项目跟客户端项目！

服务端项目：DubboServiceProvider

实现类fooserviceImpl.java

package com.alibaba.dubbo.demo.imp;

import com.alibaba.dubbo.config.annotation.Service;

import com.alibaba.dubbo.demo.DemoService;

@Service(version="1.0")

public class FooServiceImpl implements DemoService {

@Override

public String sayHello(String name) {

return "Hello " + name;

}

}

web.xml 配置扫描内容

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

<display-name>DubboServiceProvider</display-name>

<servlet>

<servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>spring</servlet-name>

<url-pattern>*</url-pattern>

</servlet-mapping>

<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<context-param>

<param-name>contextConfigLocation</param-name> <param-value>classpath*:applicationContext.xml</param-value>

</context-param>

</web-app>

applicationContext.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">

<!-- 服务端- 服务提供方 -->

<!-- 公共信息，也可以用dubbo.properties配置 -->

<dubbo:application name="test" />

<!-- 链接zookeeper -->

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

<dubbo:consumer timeout="5000"/>

<!-- 扫描注解包路径，多个包用逗号分隔，不填pacakge表示扫描当前ApplicationContext中所有的类 -->

<dubbo:annotation package="com.unj.dubbotest.serviceImp" />

<!-- xml配置 ： 声明需要暴露的服务接口 -->

<!-- <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" /> -->

<!-- xml配置 ：和本地bean一样实现服务-->

<!-- <bean id="demoService" class="com.unj.dubbotest.serviceImp.FooServiceImpl" /> -->

</beans>

测试类Provider

package com.alibaba.dubbo.test;

import java.io.IOException;

import org.junit.Before;

import org.junit.Test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

@Before

public void setUp() throws Exception {

}

@Test

public void testMain() throws IOException {

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(

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

context.start();

System.in.read();// 按任意键退出

}

}

lib下的jar包

客户端项目：DubboServiceConsumer

web.xml 配置扫描内容

applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

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

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">

<!-- 客户端- 服务消费方 -->

<!-- 公共信息，也可以用dubbo.properties配置 -->

<dubbo:application name="xx" />

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

<dubbo:consumer timeout="5000"/>

<!-- 扫描注解包路径，多个包用逗号分隔，不填pacakge表示扫描当前ApplicationContext中所有的类 -->

<dubbo:annotation package="com.unj.dubbotest.action" />

</beans>

测试类:Consumer

package com.unj.dubbotest.action;

import java.io.IOException;

import org.junit.Test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.alibaba.dubbo.config.annotation.Reference;

import com.alibaba.dubbo.demo.DemoService;

public class Consumer{

@Reference(version = "1.0")

private DemoService demoService;

@Test

public void mainTest() throws IOException {

ClassPathXmlApplicationContext context =new ClassPathXmlApplicationContext(

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

context.start();

demoService = (DemoService)context.getBean("demoService"); // 获取远程服务代理

String hello = demoService.sayHello("world"); // 执行远程方法

System.out.println( hello ); // 显示调用结果

}

}

lib下的jar包