dubbo基础

一、什么是dubbo，有什么用

　　dubbo是阿里巴巴开源的一个RPC框架，用于多个应用相互通信。使用dubbo需要安装一zookepper

二、dubbo的基本使用

　　1、构建一个maven的多模块项目，项目的大致结构如下

　　　　

　　父项目doubbo的pom.xml如下：

<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>com.kyle</groupId>
  <artifactId>dubbo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  
  
  
  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    
    <!-- spring版本号 -->
    <spring.version>4.2.5.RELEASE</spring.version>
    
    <!-- log4j日志包版本号 -->
    <slf4j.version>1.7.18</slf4j.version>
    <log4j.version>1.2.17</log4j.version>
    
   </properties>
   
   <dependencyManagement>
      <dependencies>
        
        <!-- 添加junit4依赖 -->
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
        </dependency>
 
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
 
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
 
   
        <!-- 添加日志相关jar包 -->
        <dependency>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
          <version>${log4j.version}</version>
        </dependency>
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-api</artifactId>
          <version>${slf4j.version}</version>
        </dependency>
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
          <version>${slf4j.version}</version>
        </dependency>
    
         <dependency>
             <groupId>commons-logging</groupId>
             <artifactId>commons-logging</artifactId>
             <version>1.2</version>
         </dependency>
    
        <!-- dubbo -->
        <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>dubbo</artifactId>
          <version>2.5.3</version>
          <exclusions>
            <exclusion>
              <groupId>org.springframework</groupId>
              <artifactId>spring</artifactId>
            </exclusion>
          </exclusions>
        </dependency>
    
        <!-- Zookeeper zkclient-->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.1</version>
        </dependency>
    
   </dependencies>
  </dependencyManagement>
   
   <modules>
       <module>dubbo-api</module>
       <module>dubbo-provider</module>
       <module>dubbo-consumer</module>
   </modules>
</project>

　　dubbo-api模块用于提供接口，dubbo-provider模块和dubbo-consumer模块都需要引用dubbo-api模块。从而达到模块之间松耦合的作用。

　　下面是dubbo-api的相关代码和pom文件

package com.test;

public interface DemoService{  
     String sayHello(String name);  
} 

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  
  <parent>
    <groupId>com.kyle</groupId>
    <artifactId>dubbo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  
  <groupId>com.kyle</groupId>
  <artifactId>dubbo-api</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>dubbo-api</name>
  <url>http://maven.apache.org</url>
  
  
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

　　　　dubbo-provider 是提供服务的模块，其代码和配置如下：

package org.dubbo.provider;
import org.springframework.stereotype.Service;

import com.test.DemoService;

//@Service("demoService")
public class DemoServiceImpl implements DemoService{

    @Override
    public String sayHello(String name) {
        
        return name+"你好啊"; 
    }  
}

<?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">
    
    <bean id="demoService" class="org.dubbo.provider.DemoServiceImpl"></bean>

    <!-- 提供方应用信息，用于计算依赖关系 -->  
    <dubbo:application name="dubbo_provider"  />  

    <!-- 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.test.DemoService" ref="demoService" />  
</beans>

<?xml version="1.0"?>
<project
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
    xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.kyle</groupId>
        <artifactId>dubbo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <groupId>com.kyle</groupId>
    <artifactId>dubbo-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dubbo-provider</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.kyle</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>


        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>


        <!-- 添加日志相关jar包 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </dependency>

        <!-- dubbo -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- Zookeeper zkclient -->
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
        </dependency>
    </dependencies>


</project>

　　　　dubbo-consumer是服务消费方

package com.dubbo.consumer;

import java.io.IOException;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.test.DemoService;

public class Test {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = 
                new ClassPathXmlApplicationContext("dubbo-consumer.xml");

        context.start();
        DemoService demoService = (DemoService) context.getBean("demoService");

        System.out.println(demoService.sayHello("kyle"));
        try {
            System.in.read();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

<?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="dubbo_consumer" />       
      <!-- 使用multicast广播注册中心暴露发现服务地址 -->    
    <dubbo:registry  protocol="zookeeper" address="zookeeper://127.0.0.1:2181" />         
      <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->    
    <dubbo:reference id="demoService" interface="com.test.DemoService" />    
</beans>   

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.kyle</groupId>
    <artifactId>dubbo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <groupId>com.kyle</groupId>
  <artifactId>dubbo-consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>dubbo-consumer</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
  
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
    </dependency>
    
     <dependency>
        <groupId>com.kyle</groupId>
        <artifactId>dubbo-api</artifactId>
        <version>0.0.1-SNAPSHOT</version>
     </dependency>
    
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
    </dependency>
 
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
    </dependency>
 
    <!-- dubbo -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <exclusions>
        <exclusion>
          <groupId>org.springframework</groupId>
          <artifactId>spring</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
   
    <!-- Zookeeper zkclient-->
    <dependency>
        <groupId>com.github.sgroschupf</groupId>
        <artifactId>zkclient</artifactId>
    </dependency>
    
  </dependencies>

</project>

三、dubbo管理平台的搭建

　　1.下载dubbo管理平台的war包， dubbo-admin-2.6.0.war，并部署到tomcat。

　　2.修改配置文件dubbo.properties

dubbo.registry.address=zookeeper://127.0.0.1:2181

dubbo.admin.root.password=root

dubbo.admin.guest.password=guest

　　3.访问dubbo管理平台