Dubbo入门教程（适合新手）

    先不管什么原理，直接写个demo。

服务端（dubbo-server）

1. pom.xml

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>4.0.0modelVersion>

    <groupId>com.lwbgroupId>
    <artifactId>dubbo-serverartifactId>
    <version>1.0-SNAPSHOTversion>
    <packaging>jarpackaging>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    properties>

    <dependencies>
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>4.1.6.RELEASEversion>
        dependency>
        

        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>dubboartifactId>
            <version>2.5.3version>
        dependency>
        

        
        <dependency>
            <groupId>org.apache.zookeepergroupId>
            <artifactId>zookeeperartifactId>
            <version>3.3.6version>
        dependency>
        

        
        <dependency>
            <groupId>commons-logginggroupId>
            <artifactId>commons-loggingartifactId>
            <version>1.1.1version>
        dependency>
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>1.2.15version>
            <exclusions>
                <exclusion>
                    <groupId>com.sun.jdmkgroupId>
                    <artifactId>jmxtoolsartifactId>
                exclusion>
                <exclusion>
                    <groupId>com.sun.jmxgroupId>
                    <artifactId>jmxriartifactId>
                exclusion>
                <exclusion>
                    <artifactId>jmsartifactId>
                    <groupId>javax.jmsgroupId>
                exclusion>
                <exclusion>
                    <artifactId>mailartifactId>
                    <groupId>javax.mailgroupId>
                exclusion>
            exclusions>
        dependency>
        

        
        <dependency>
            <groupId>org.jboss.nettygroupId>
            <artifactId>nettyartifactId>
            <version>3.2.0.Finalversion>
        dependency>
        <dependency>
            <groupId>com.101tecgroupId>
            <artifactId>zkclientartifactId>
            <version>0.8version>
        dependency>
        
    dependencies>
project>

2. 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: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="dubbo-server" owner="lwb" />
    
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />
    <dubbo:protocol contextpath="dubbo" port="20881" />
    <dubbo:monitor protocol="registry"/>

    
    <bean id="elasticService" class="com.lwb.service.impl.ElasticServiceImpl" />

    
    <dubbo:service interface="com.lwb.service.ElasticService" ref="elasticService" protocol="dubbo" timeout="50000"/>

beans>

3. 代码

package com.lwb.service;

/**
 * @author liuweibo
 * @date 2018/5/9
 */
public interface ElasticService {

    String helloDubbo(String msg);
}

package com.lwb.service.impl;

import com.lwb.service.ElasticService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

/**
 * @author liuweibo
 * @date 2018/5/9
 */
public class ElasticServiceImpl implements ElasticService {

    private static final Logger LOGGER = LoggerFactory.getLogger(ElasticServiceImpl.class);

    public String helloDubbo(String msg) {
        System.out.println(msg);
        return "hi!" + msg;
    }
}

4. 项目结构

5. 启动类（Application.java）

    这里就直接用main方法启动了

package com.lwb;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

/**
 * @author liuweibo
 * @date 2018/5/9
 */
public class Application {
    public static void main(String[] args) throws IOException {

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "dubbo.xml" });
        context.start();
        System.out.println("任意按键退出");
        System.in.read();
        context.close();
    }
}

    客户端（dubbo-client）

1. pom.xml

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>4.0.0modelVersion>

    <groupId>com.lwbgroupId>
    <artifactId>dubbo-clientartifactId>
    <version>1.0-SNAPSHOTversion>
    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    properties>

    <dependencies>
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>4.1.6.RELEASEversion>
        dependency>
        

        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>dubboartifactId>
            <version>2.5.3version>
        dependency>
        

        
        <dependency>
            <groupId>org.apache.zookeepergroupId>
            <artifactId>zookeeperartifactId>
            <version>3.3.6version>
        dependency>
        

        
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>1.2.15version>
            <exclusions>
                <exclusion>
                    <groupId>com.sun.jdmkgroupId>
                    <artifactId>jmxtoolsartifactId>
                exclusion>
                <exclusion>
                    <groupId>com.sun.jmxgroupId>
                    <artifactId>jmxriartifactId>
                exclusion>
                <exclusion>
                    <artifactId>jmsartifactId>
                    <groupId>javax.jmsgroupId>
                exclusion>
                <exclusion>
                    <artifactId>mailartifactId>
                    <groupId>javax.mailgroupId>
                exclusion>
            exclusions>
        dependency>
        

        
        <dependency>
            <groupId>com.101tecgroupId>
            <artifactId>zkclientartifactId>
            <version>0.8version>
        dependency>
        <dependency>
            <groupId>com.lwbgroupId>
            <artifactId>dubbo-serverartifactId>
            <version>1.0-SNAPSHOTversion>
        dependency>
        
    dependencies>
    
project>

2. 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: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="consumer-of-dubbo-demo" />

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

    
    <dubbo:reference id="elasticService" interface="com.lwb.service.ElasticService" />

beans>

3. 服务调用（这里为了简单，就在main方法里面处理了哈，Application.java）

package com.lwb;

import com.lwb.service.ElasticService;
import com.lwb.service.impl.ElasticServiceImpl;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author liuweibo
 * @date 2018/5/9
 */
public class Application {

    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "dubbo.xml" });
        context.start();
        ElasticService service = (ElasticService) context.getBean("elasticService");
        System.out.println(service.helloDubbo("world"));
        context.close();
    }
}

4. 项目结构