dubbo简单入门（helloworld例子）

快来打我* 2022-06-01 02:56 233阅读 0赞

Dubbo现在支持的有三种方式：   
1.multicast；   
2.zookeeper；   
3.redis   
下面的Demo使用的是multicast方式。

提供者项目结构：   
![这里写图片描述][20160531094349379]   
消费者项目结构：   
![这里写图片描述][20160531094514333]

服务端：

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>  
     
      
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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" />  
    <dubbo:registry address="multicast://224.5.6.7:1234"/>   
    
    <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>  
     
      
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helloworld接口：

package com.ming.dubboserver;
    
    public interface HelloWorld {
        public String hello(String name);
    }
    
     
      
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helloworld实现类

package com.ming.dubboserver;
    
    public class HelloWorldImpl implements HelloWorld { 
    
        public String hello(String name) {
            name = name + "小明测试";
            return name;
    
        }
    
    }
    
     
      
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服务启动类：

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();
        }
    }
    
     
      
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客户端：   
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>  
     
      
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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>   
     
      
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测试类：

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("执行完毕");
        }
    
        public static void main(String[] args) {
            new Thread(new ConsumerThd()).start();
        }
    }
    
     
      
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还有一种方式是将Zookeeper作为注册中心，需要下载并安装zookeeper。将配置文件中的注册中心修改为如下即可：

其他代码不用修改，推荐使用zookeeper作为注册中心。如此可以通过Dubbo+注册中心实现分布式服务。服务消费者不用知道服务的具体位置，只要知道注册中心位置即可，消费者只要能消费，不用管消费的是哪的服务，服务提供方与服务消费方解耦。   
使用zookeeper注册中心，与dubbo结合，可以查看服务提供者和消费者的信息，将dubbo管理的war包部署到tomcat上，查看服务提供者

[20160531094349379]: /images/20220601/90cc6c5ccd594ae291df959cfc09b9a5.png
[20160531094514333]: /images/20220601/6efe3959b1934cfcb040fd2831b4a18c.png