为什么要学习dubbo 这里不多做说明，有需要可自行百度
说明：基于zookeeper 作为注册服务中心，
1：新建两个maven 项目，一个作为服务提供者，一个作为服务消费者，如下
dubbo-client -- 服务消费者
dubbo-provider -- 服务提供者
2：服务端接口代码如下（服务接口作为服务提供者的一个子模块打包成jar包以供调用）
public interface SayHello {
public String sayHello(String name);
}
3：接口实现代码如下
public class SayHelloImpl implements SayHello {
@Override
public String sayHello(String name) {
return "hello version 1.0.0"+name;
}
public static void main(String[] args) throws Exception{
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("dubbo-server.xml");
context.start();
System.in.read();
}
}
4：版本升级处理,可通过配置文件指定version,然后在客户端指定调用的版本
public class SayHelloImpl2 implements SayHello {
@Override
public String sayHello(String name) {
return "hello version 2.0.0"+name;
}
public static void main(String[] args) throws Exception{
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("dubbo-server.xml");
context.start();
System.in.read();
}
}
5：服务提供配置xml
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
xmlns="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
<!-- 提供方应用信息，用于计算依赖关系,dubbo-provider这个是项目名 -->
<dubbo:application name="dubbo-provider"/>
<!-- 这里使用的注册中心是zookeeper -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" client="zkclient"/>
<!-- 用dubbo协议在20880端口暴露服务 -->
<dubbo:protocol name="dubbo" port="20880" />
<!-- 将该接口暴露到dubbo中 ,在做服务升级的时候，为了兼容老版本，可通过 version 可以指定调用的版本-->
<dubbo:service interface="com.share.dubbo.SayHello" ref="sayHelloImpl" version="1.0.0"/>
<dubbo:service interface="com.share.dubbo.SayHello" ref="sayHelloImpl2" version="2.0.0"/>
<bean id="sayHelloImpl" class="com.share.dubbo.SayHelloImpl" />
<bean id="sayHelloImpl2" class="com.share.dubbo.SayHelloImpl2" />
</beans>
6：客户端调用(引入服务接口jar包)
<dependency>
<groupId>com.share.dubbo</groupId>
<artifactId>service-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
xmlns="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
<!-- 提供方应用信息，用于计算依赖关系,dubbo-provider这个是项目名 -->
<dubbo:application name="dubbo-client" />
<!-- 这里使用的注册中心是zookeeper -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" client="zkclient"/>
<!--通过version 指定调用的版本-->
<dubbo:reference id="sayHelloImpl" interface="com.share.dubbo.SayHello" version="2.0.0"/>
</beans>
7：客服端调用服务
ublic class SayHelloClient {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
new String[] { "dubbo-client.xml" });
context.start();
SayHello hello = (SayHello)context.getBean("sayHelloImpl");
String name = hello.sayHello("我是来测试的");
System.out.println(name);
}
}
测试：
启动zookeeper 后，在启动服务端，然后会在zookeeper 中看到新注册的服务中心地址，然后在启动客户端检验服务调用是否成功
ls /dubbo/com.share.dubbo.SayHello/providers
[dubbo%3A%2F%2F169.254.72.117%3A20880%2Fcom.share.dubbo.SayHello%3Fanyhost%3Dtrue%26application%3Ddubbo-provider%26dubbo%3D2.5.6%26generic%3Dfalse%26interface%3Dcom.share.dubbo.SayHello%26methods%3DsayHello%26pid%3D48779%26revision%3D1.0.0%26side%3Dprovider%26timestamp%3D1533543075021%26version%3D1.0.0, dubbo%3A%2F%2F169.254.72.117%3A20880%2Fcom.share.dubbo.SayHello2%3Fanyhost%3Dtrue%26application%3Ddubbo-provider%26dubbo%3D2.5.6%26generic%3Dfalse%26interface%3Dcom.share.dubbo.SayHello%26methods%3DsayHello%26pid%3D48779%26revision%3D2.0.0%26side%3Dprovider%26timestamp%3D1533543090459%26version%3D2.0.0]
以上完成了 dubbo 简单的服务调用完成，事例代码稍后会上传github上以供下载
