dubbo使用方法
Dubbo采用全Spring配置方式,透明化接入应用,对应用没有任何API侵入,只需用Spring加载Dubbo的配置即可,Dubbo基于Spring的Schema扩展进行加载。如果不想使用Spring配置,而希望通过API的方式进行调用(不推荐)
下面我们就来看看spring配置方式的写法:
服务提供者:
1. 下载zookeeper注册中心,下载地址:http://www.apache.org/dyn/closer.cgi/zookeeper/ 下载后解压即可,进入D:\apach-zookeeper-3.4.5\bin,
双击zkServer.cmd启动注册中心服务。
2. 定义服务接口: (该接口需单独打包,在服务提供方和消费方共享)
下面这个例子不错,写的很详细可以做个model.
- package com.unj.dubbotest.provider;
- import java.util.List;
- public interface DemoService {
- String sayHello(String name);
- public List getUsers();
- }
在服务提供方实现接口:(对服务消费方隐藏实现)
- package com.unj.dubbotest.provider;
- import java.util.ArrayList;
- import java.util.LinkedList;
- import java.util.List;
- public class DemoServiceImpl implements DemoService{
- public String sayHello(String name) {
- return "Hello " + name;
- }
- public List getUsers() {
- List list = new ArrayList();
- User u1 = new User();
- u1.setName("jack");
- u1.setAge(20);
- u1.setSex("男");
- User u2 = new User();
- u2.setName("tom");
- u2.setAge(21);
- u2.setSex("女");
- User u3 = new User();
- u3.setName("rose");
- u3.setAge(19);
- u3.setSex("女");
- list.add(u1);
- list.add(u2);
- list.add(u3);
- return list;
- }
- }
用Spring配置声明暴露服务:
- <?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
- ">
- <!-- 具体的实现bean -->
- <bean id="demoService" class="com.unj.dubbotest.provider.DemoServiceImpl" />
- <!-- 提供方应用信息,用于计算依赖关系 -->
- <dubbo:application name="xixi_provider" />
- <!-- 使用multicast广播注册中心暴露服务地址
- <dubbo:registry address="multicast://224.5.6.7:1234" />-->
- <!-- 使用zookeeper注册中心暴露服务地址 -->
- <dubbo:registry address="zookeeper://127.0.0.1:2181" />
- <!-- 用dubbo协议在20880端口暴露服务 -->
- <dubbo:protocol name="dubbo" port="20880" />
- <!-- 声明需要暴露的服务接口 -->
- <dubbo:service interface="com.unj.dubbotest.provider.DemoService" ref="demoService" />
- </beans>
加载Spring配置,启动服务:
- package com.unj.dubbotest.provider;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- public class Provider {
- public static void main(String[] args) throws Exception {
- ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"applicationContext.xml"});
- context.start();
- System.in.read(); // 为保证服务一直开着,利用输入流的阻塞来模拟
- }
- }
服务消费者:
applicationContext-dubbo.xml 中注册自己需要调用的接口,我刚开始测试的时候需要的接口很多,所以把这个文件写的满满的,后来熟悉了把接口按业务类型分开,写了N多个 applicationContext-dubbo-***.xml 简练多了 》。
1.通过Spring配置引用远程服务:
- <?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="hehe_consumer" />
- <!-- 使用zookeeper注册中心暴露服务地址 -->
- <!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->
- <dubbo:registry address="zookeeper://127.0.0.1:2181" />
- <!-- 生成远程服务代理,可以像使用本地bean一样使用demoService -->
- <dubbo:reference id="demoService"
- interface="com.unj.dubbotest.provider.DemoService" />
- </beans>
2.加载Spring配置,并调用远程服务:
- package com.alibaba.dubbo.demo.pp;
- import java.util.List;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import com.unj.dubbotest.provider.DemoService;
- public class Consumer {
- public static void main(String[] args) throws Exception {
- ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
- new String[] { "applicationContext.xml" });
- context.start();
- DemoService demoService = (DemoService) context.getBean("demoService"); //
- String hello = demoService.sayHello("tom"); // ִ
- System.out.println(hello); //
- //
- List list = demoService.getUsers();
- if (list != null && list.size() > 0) {
- for (int i = 0; i < list.size(); i++) {
- System.out.println(list.get(i));
- }
- }
- // System.out.println(demoService.hehe());
- System.in.read();
- }
- }