dubbo簡單入門（helloworld例子）

Dubbo現在支援的有三種方式：

1.multicast；

2.zookeeper；

3.redis

下面的Demo使用的是multicast方式。

提供者項目結構：

dubbo簡單入門（helloworld例子）

消費者項目結構：

dubbo簡單入門（helloworld例子）

服務端：

pom.xml配置

<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.ming</groupId>
    <artifactId>dubboserver</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
        </dependency>
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.15.0-GA</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.15</version>
            <exclusions>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
                <exclusion>
                    <artifactId>jms</artifactId>
                    <groupId>javax.jms</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>mail</artifactId>
                    <groupId>javax.mail</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.3.6</version>
        </dependency>
        <dependency>
            <groupId>com.github.adyliu</groupId>
            <artifactId>zkclient</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.2.0.Final</version>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.4</version>
        </dependency>
    </dependencies>
</project>

applicationProvider.xml配置:

<?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="hello-world" /><!-- 注冊位址 -->  
<dubbo:registry address="multicast://224.5.6.7:1234"/>   
<!-- <dubbo:registry address="127.0.0.1:2181" protocol="zookeeper"/>  -->
<dubbo:protocol name="dubbo" port="20880" />          
<bean id="demoService" class="com.ming.dubboserver.HelloWorldImpl" />  
<dubbo:service interface="com.ming.dubboserver.HelloWorld" ref="demoService" executes="10" />  
</beans>

helloworld接口：

package com.ming.dubboserver;

public interface HelloWorld {
    public String hello(String name);
}

helloworld實作類

package com.ming.dubboserver;

public class HelloWorldImpl implements HelloWorld {

    public String hello(String name) {
        name = name + "小明測試";
        return name;

    }

}

服務啟動類：

package com.ming.dubboserver;

import java.io.IOException;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DubboProviderMain {
    public static void main(String[] args) throws IOException {

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "applicationProvider.xml" });
        context.start();
        System.out.println("Press any key to exit.");
        System.in.read();
    }
}

用戶端：

pom.xml

<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.ming</groupId>
    <artifactId>dubboconsumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dubboconsumer</name>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
        </dependency>
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.15.0-GA</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.15</version>
            <exclusions>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
                <exclusion>
                    <artifactId>jms</artifactId>
                    <groupId>javax.jms</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>mail</artifactId>
                    <groupId>javax.mail</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>com.github.adyliu</groupId>
            <artifactId>zkclient</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.3.6</version>
        </dependency>
        <dependency>
            <groupId>com.ming</groupId>
            <artifactId>dubboserver</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

applicationConsumer.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-helloworld-app" />
    <dubbo:registry address="multicast://224.5.6.7:1234" />
    <dubbo:reference id="demoService" interface="com.ming.dubboserver.HelloWorld" />
</beans>

測試類：

package com.ming.dubboconsumer;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ming.dubboserver.HelloWorld;
public class ConsumerThd implements Runnable {
    public void run() {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "applicationConsumer.xml" });
        context.start();
        context.getBean("demoService");

         HelloWorld helloWorld = (HelloWorld) context.getBean("demoService");
         String hello = helloWorld.hello("小明");
         System.out.println(hello);
         System.out.println("執行完畢");
    }

    public static void main(String[] args) {
        new Thread(new ConsumerThd()).start();
    }
}

還有一種方式是将Zookeeper作為注冊中心，需要下載下傳并安裝zookeeper。将配置檔案中的注冊中心修改為如下即可：

其他代碼不用修改，推薦使用zookeeper作為注冊中心。如此可以通過Dubbo+注冊中心實作分布式服務。服務消費者不用知道服務的具體位置，隻要知道注冊中心位置即可，消費者隻要能消費，不用管消費的是哪的服務，服務提供方與服務消費方解耦。

使用zookeeper注冊中心，與dubbo結合，可以檢視服務提供者和消費者的資訊，将dubbo管理的war包部署到tomcat上，檢視服務提供者

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