dubbo

新项目中遇到dubbo,然后就想着学一下。

1、打开官网，把代码拷贝下来。

//Provider 类：发布服务

import org.springframework.context.support.ClassPathXmlApplicationContext;public class Provider {    public static void main(String[] args) throws Exception {        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                new String[] {"META-INF/spring/dubbo-demo-provider.xml"});        context.start();        System.in.read(); // press any key to exit    }}

import com.alibaba.dubbo.demo.DemoService;import org.springframework.context.support.ClassPathXmlApplicationContext;//Consumer调用服务 public class Consumer {    public static void main(String[] args) throws Exception {        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                new String[]{"META-INF/spring/dubbo-demo-consumer.xml"});        context.start();        DemoService demoService = (DemoService) context.getBean("demoService"); // obtain proxy object for remote invocation        String hello = demoService.sayHello("world"); // execute remote invocation        System.out.println(hello); // show the result    }}

//接口

package com.alibaba.dubbo.demo;public interface DemoService {String sayHello(String name);}

//实现类

package com.alibaba.dubbo.demo.provider;import com.alibaba.dubbo.demo.DemoService;public class DemoServiceImpl implements DemoService {public String sayHello(String name) {        return "Hello " + name;}}

配置文件1

<?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">    <dubbo:application name="demo-consumer"/>    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>    <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.DemoService"/></beans>

配置文件2
<?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">    <dubbo:application name="demo-provider"/>    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>    <dubbo:protocol name="dubbo" port="20880"/>    <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService"/>    <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl"/></beans>
先运行服务，后运行客户端就可以了。
注意：我开始写的<dubbo:registry address="multicast://234.4.5.6:1234" />报错了，
multicast是个什么东西，我也不清楚，然后看着别人的写了zookeeper。zookeeper我懂啊。
1，下载了一个zookeeper，解压，运行bin里的zkServer.cmd，报错了。
2、将conf/zoo_c****.cfg修改为zoo.cfg.
将dataDir=E:\stu\zookeeper\zookeeper-3.4.6\conf/dataDir
3、重新启动zkServer.cmd，provider,Consumer 。
好了。
另外，pom.xml里为
<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>dubboio</groupId>  <artifactId>dubboio</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>jar</packaging>  <name>dubboio</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <spring.version>3.0.0.RELEASE</spring.version>    <slf4j.version>1.7.5</slf4j.version>  </properties>  <dependencies>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>    <dependency>    <groupId>com.alibaba</groupId>    <artifactId>dubbo</artifactId>    <version>2.5.5</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${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-expression</artifactId><version>${spring.version}</version></dependency><!-- log --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.16</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>${slf4j.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>${slf4j.version}</version></dependency><dependency>  <groupId>com.github.sgroschupf</groupId>  <artifactId>zkclient</artifactId>  <version>0.1</version></dependency><!--  zookeeper --><dependency>  <groupId>org.apache.zookeeper</groupId>  <artifactId>zookeeper</artifactId>  <version>3.4.6</version></dependency>  </dependencies></project>

备注：开始的时侯报：找不到META-INF/spring/dubbo-demo-provider.xml
后来放到和Provider相同的目录下就好了。