Provider和Consumer的搭建（六）

创建三个Maven Project：

• dubbo-service：公共模块，包括服务接口（packaging：jar）
• dubbo-service-impl：服务提供方，提供服务接口的具体实现，需要依赖dubbo-service（packaging：jar）
• dubbo-consumer：服务调用方，需要依赖dubbo-service（packaging：jar/war）

一、dubbo-service

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

二、dubbo-service-impl

1. 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.linhw.demo</groupId>
    <artifactId>dubbo-service-impl</artifactId>
    <version>0.0.1-SNAPSHOT</version>
　　
    <dependencies>
        <dependency>
            <groupId>com.linhw.demo</groupId>
            <artifactId>dubbo-service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <!-- dubbo依赖 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.0</version>
        </dependency>

        <!-- 访问 zookeeper 的客户端 jar -->
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.10</version>
        </dependency>
    </dependencies>
</project>

2. 接口实现类

public class DemoServiceImpl implements DemoService{

    @Override
    public String demo(String name) {
        return "dubbo RPC " + name;
    }

}

3. 新增配置文件dubbo-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-2.5.xsd
    http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- 给当前provider自定义一个名字 -->
    <dubbo:application name="demo-provider"/>
    <!-- 配置注册中心 -->
    <dubbo:registry address="192.168.178.5:2181" protocol="zookeeper"/>
    <!-- 配置协议及端口 -->
    <dubbo:protocol name="dubbo" port="28888"/>
    <!-- 注册功能 -->
    <bean id="demoService" class="com.linhw.demo.service.impl.DemoServiceImpl"/>
    <dubbo:service interface="com.linhw.demo.service.DemoService" ref="demoService"/>
</beans>

4. 启动容器

(1) 通过 spring 方式启动：对dubbo-provider.xml的位置没有要求

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("dubbo-provider.xml");
ctx.start();
System.out.println("启动成功");
System.in.read();

(2) 使用 dubbo 提供的方式启动(推荐使用这种方式)：要求 dubbo-provider.xml必须放入类路径下/META-INF/spring/*.xml

Main.main(args);

查看是否发布成功，可以启动Dubbo Admin，在管理控制台查看。

三、dubbo-consumer

 1. 服务调用

import com.alibaba.dubbo.config.annotation.Reference;
import com.linhw.demo.service.DemoService;
import com.linhw.demo.service.TestService;
public class TestServiceImpl implements TestService{
    
    @Reference
    private DemoService demoService;
    
    @Override
    public String sayHello(String name) {
        name = "hello";
        return demoService.demo(name);
    }
}

2. 新建applicationContext-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-2.5.xsd
    http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
    <!-- 给当前 Provider 自定义个名字 --> 
    <dubbo:application name="dubbo-consumer"/> 
    <!-- 配置注册中心 --> 
    <dubbo:registry address="192.168.178.5:2181" protocol="zookeeper"/>
    
    <!-- 配置注解扫描 --> 
    <dubbo:annotation package="com.linhw.demo.service.impl"/>
    
    <bean id="testServiceImpl" class="com.linhw.demo.service.impl.TestServiceImpl"/>
    
</beans>

3. 测试

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-dubbo.xml");
TestService testService = ctx.getBean("testServiceImpl", TestServiceImpl.class);
System.out.println(testService.sayHello("hello"));