快速搭建一個簡單的dubbo示例

源代碼已上傳github:https://github.com/zhsun1995/dubbo_test

一、服務端

1、導入依賴

<?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">
    <parent>
        <artifactId>dubbotest</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo_provider</artifactId>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.10</version>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.5</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.32.Final</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.8.0</version>
        </dependency>

    </dependencies>

</project>

2、ProviderService和ProviderServiceImpl

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

public class ProviderServiceImpl implements ProviderService {

    public String sayHello(String name) {
        return "Hello " + name;
    }
}

3、provider.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">

    <!--當前項目在整個分佈式架構裏面的唯一名稱，計算依賴關係的標籤-->
    <dubbo:application name="provider" owner="laosun">
        <dubbo:parameter key="qos.enable" value="true"/>
        <dubbo:parameter key="qos.accept.foreign.ip" value="false"/>
        <dubbo:parameter key="qos.port" value="55555"/>
    </dubbo:application>

    <dubbo:monitor protocol="registry"/>

    <!--dubbo這個服務所要暴露的服務地址所對應的註冊中心-->
    <!--<dubbo:registry address="N/A"/>-->
    <dubbo:registry address="N/A" />

    <!--當前服務發佈所依賴的協議；webserovice、Thrift、Hessain、http-->
    <dubbo:protocol name="dubbo" port="20880"/>

    <!--服務發佈的配置，需要暴露的服務接口-->
    <dubbo:service
            interface="com.laosun.service.ProviderService"
            ref="providerService"/>

    <!--Bean bean定義-->
    <bean id="providerService" class="com.laosun.service.impl.ProviderServiceImpl"/>

</beans>

4、啓動類

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class Application {
    public static void main( String[] args ) throws IOException, IOException {
        //加載xml配置文件啓動
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
        context.start();
        System.in.read(); // 按任意鍵退出
    }
}

注意添加log4j.xml。
運行後，

注意圖中dubbo的url，後續要用。

二、消費端

1、添加依賴

<?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">
    <parent>
        <artifactId>dubbotest</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo_consumer</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>dubbo_provider</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.10</version>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.5</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.32.Final</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>2.8.0</version>
        </dependency>
    </dependencies>
</project>

2、consumer.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">

    <!--當前項目在整個分佈式架構裏面的唯一名稱，計算依賴關係的標籤-->
    <dubbo:application name="consumer" owner="sihai"/>

    <!--dubbo這個服務所要暴露的服務地址所對應的註冊中心-->
    <!--點對點的方式-->
    <dubbo:registry address="N/A" />
    <!--<dubbo:registry address="zookeeper://localhost:2181" check="false"/>-->

    <!--生成一個遠程服務的調用代理-->
    <!--點對點方式-->
    <dubbo:reference id="providerService"
                     interface="com.laosun.service.ProviderService"
                     url="dubbo://10.4.16.50:20880/com.laosun.service.ProviderService"/>

    <!--<dubbo:reference id="providerService"
                     interface="com.sihai.dubbo.provider.service.ProviderService"/>-->
</beans>

這裏用到了服務端產生的dubbo的url。

3、啓動類

package com.laosun.consumer;

import com.laosun.service.ProviderService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

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

        ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("consumer.xml");
        context.start();
        ProviderService providerService = (ProviderService) context.getBean("providerService");
        String str = providerService.sayHello("laosun");
        System.out.println(str);
        System.in.read();

    }
}

運行之後，出現

點對點方式搭建完成。

三、加入zookeeper作爲註冊中心

1、zookeeper安裝

(1)官網下載鏈接，本文使用的是3.4.14版本，下載後解壓。
(2)複製zookeeper-3.4.14\conf目錄下的zoo_sample.cfg並改名爲zoo.cfg，對其zoo.cfg配置進行修改:
dataDir=C:/ZHSUN/zookeeper-3.4.14/data
(3)cmd命令進入bin目錄，輸入命令：
zkServer.cmd
打開服務端

2、修改provider.xml

只需修改一句，將

<dubbo:registry address="N/A" />

修改爲：

<dubbo:registry address="zookeeper://localhost:2181" check="false"/>

如果使用zookeeper，則改爲：

<dubbo:registry protocol="zookeeper" address="192.168.11.129:2181,192.168.11.137:2181,192.168.11.138:2181"/>

3、修改consumer.xml

（1）同provider.xml一樣：

<dubbo:registry address="zookeeper://localhost:2181" check="false"/>

（2）使用zookeeper時，reference就不需要dubbo的url，改爲：

<dubbo:reference id="providerService"
                 interface="com.laosun.service.ProviderService"/>

4、運行兩個Application，注意要先開啓zookeeper服務。

同樣運行成功。

四、API配置方式

此方式不需要任何配置文件，只需要開啓zookeeper，運行下面兩個類即可。

1、服務端的啓動類

import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.ProtocolConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.alibaba.dubbo.config.ServiceConfig;
import com.laosun.service.ProviderService;
import com.laosun.service.impl.ProviderServiceImpl;

import java.io.IOException;

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

        // 生成服務端對象
        ProviderService providerService = new ProviderServiceImpl();

        // 當前應用配置
        ApplicationConfig application = new ApplicationConfig();
        application.setName("provider");
        application.setOwner("laosun");

        // 連接註冊中心
        RegistryConfig registry = new RegistryConfig();
        registry.setAddress("zookeeper://127.0.0.1:2181");

        // 服務提供者協議配置
        ProtocolConfig protocol = new ProtocolConfig();
        protocol.setName("dubbo");
        protocol.setPort(20880);

        // ServiceConfig內部封裝了與註冊中心的連接，以及開啓服務端口,實例很重，正式應用需要進行緩存
        // 服務者暴露服務配置
        ServiceConfig<ProviderService> service = new ServiceConfig<ProviderService>();
        service.setApplication(application);
        service.setRegistry(registry);
        service.setProtocol(protocol);
        service.setInterface(ProviderService.class);
        service.setRef(providerService);
        service.setVersion("1.0.0");

        // 暴露服務及註冊
        service.export();

        System.in.read();
    }
}

2、消費端的啓動類

import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.ReferenceConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.laosun.service.ProviderService;
import com.laosun.service.impl.ProviderServiceImpl;

public class AppApi {
    public static void main(String[] args) {
        ApplicationConfig application = new ApplicationConfig();
        application.setName("consumer");
        application.setOwner("laosun");

        // 配置連接中心
        RegistryConfig registry = new RegistryConfig();
        registry.setAddress("zookeeper://127.0.0.1:2181");

        // 引用遠程服務
        ReferenceConfig<ProviderService> reference = new ReferenceConfig<ProviderService>(); //實例很重，需要進行緩存
        reference.setApplication(application);
        reference.setRegistry(registry);
        reference.setInterface(ProviderService.class);

        // 使用服務端
        ProviderService providerService = new ProviderServiceImpl();
        String str = providerService.sayHello("laosun");
        System.out.println(str);
    }
}

五、註解配置方式

1、給ProviderServiceImpl添加註解 @Service

2、組裝服務端

import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.ProtocolConfig;
import com.alibaba.dubbo.config.ProviderConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableDubbo(scanBasePackages = "com.laosun.service")
public class DubboProviderConfig {
    @Bean
    // 服務端信息配置
    public ProviderConfig providerConfig() {
        ProviderConfig config = new ProviderConfig();
        config.setTimeout(1000);
        return config;
    }

    @Bean
    // 分佈式應用信息配置
    public ApplicationConfig applicationConfig() {
        ApplicationConfig config = new ApplicationConfig();
        config.setName("provider");
        return config;
    }

    @Bean
    // 註冊中心信息配置
    public RegistryConfig registryConfig() {
        RegistryConfig config = new RegistryConfig();
        config.setProtocol("zookeeper");
        config.setAddress("127.0.0.1");
        config.setPort(2181);
        return config;
    }

    @Bean
    // 使用dubbo協議配置
    public ProtocolConfig protocolConfig() {
        ProtocolConfig config = new ProtocolConfig();
        config.setName("dubbo");
        config.setPort(20881);
        return  config;
    }
}

3、服務端啓動類

import com.laosun.config.DubboProviderConfig;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.io.IOException;

public class AppAnnotation {
    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DubboProviderConfig.class);
        context.start();
        System.in.read();
    }
}

啓動成功：

4、消費端的service

import com.alibaba.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Component;

@Component
public class ConsumerAnnotationService {
    @Reference
    private ProviderService providerService;

    public String sayHello(String name) {
        return providerService.sayHello(name);
    }
}

這裏注意Reference包不要引用錯了，不然會報NPE異常。

5、組裝消費者

import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.ConsumerConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

import java.util.HashMap;
import java.util.Map;

@Configuration
@EnableDubbo(scanBasePackages = "com.laosun.service")
@ComponentScan(value = {"com.laosun.service"})
public class DubboConsumerConfig {
    @Bean
    // 應用配置
    public ApplicationConfig applicationConfig() {
        ApplicationConfig config = new ApplicationConfig();
        config.setName("consumer");
        Map<String, String> map = new HashMap<String, String>();
        map.put("qos.enable", "true");
        map.put("qos.accept.foreign.ip", "false");
        map.put("qos.port", "33333");
        config.setParameters(map);
        return config;
    }

    @Bean
    // 消費者配置
    public ConsumerConfig consumerConfig() {
        ConsumerConfig config = new ConsumerConfig();
        config.setTimeout(5000);
        return config;
    }

    @Bean
    // 配置註冊中心
    public RegistryConfig registryConfig() {
        RegistryConfig config = new RegistryConfig();
        config.setProtocol("zookeeper");
        config.setAddress("127.0.0.1");
        config.setPort(2181);
        return config;
    }
}

6、消費者啓動類

import com.laosun.config.DubboConsumerConfig;
import com.laosun.service.ConsumerAnnotationService;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.io.IOException;

public class AppAnnotation {

    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DubboConsumerConfig.class);
        context.start();
        ConsumerAnnotationService service = context.getBean(ConsumerAnnotationService.class);
        String str = service.sayHello("laosun");
        System.out.println(str);
        System.in.read();
    }
}

運行成功：

參考鏈接：https://segmentfault.com/a/1190000019896723