Dubbo helloword

首先，开始编写服务提供者的api接口，

SampleService  接口

package bhz.dubbo.sample.provider;

import java.util.List;

public interface SampleService {

    String sayHello(String name);

    public List getUsers();

}

实现类

package bhz.dubbo.sample.provider.impl;

import java.util.ArrayList;
import java.util.List;

import bhz.dubbo.sample.provider.SampleService;

public class SampleServiceImpl implements SampleService {
    
    public String sayHello(String name) {
        return "Hello " + name;
    }

    public List getUsers() {
        List list = new ArrayList();
        User u1 = new User();
        u1.setName("jack");
        u1.setAge(20);
        u1.setSex("m");

        User u2 = new User();
        u2.setName("tom");
        u2.setAge(21);
        u2.setSex("m");

        User u3 = new User();
        u3.setName("rose");
        u3.setAge(19);
        u3.setSex("w");

        list.add(u1);
        list.add(u2);
        list.add(u3);
        return list;
    }
}

User 对象

package bhz.dubbo.sample.provider.impl;

import java.io.Serializable;

public class User implements Serializable {
    private static final long serialVersionUID = 1L;
    private int age;
    private String name;
    private String sex;

    public User() { 
        super();
    }

    public User(int age, String name, String sex) {
        super();
        this.age = age;
        this.name = name;
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

}

启动类

package bhz.dubbo.sample.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "sample-provider.xml" });
        context.start(); 
        System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟
    }
}

看一下配置文件

<?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
        ">

    <!-- 具体的实现bean -->
    <bean id="directService" class="bhz.dubbo.direct.provider.impl.DirectServiceImpl" />

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

    <!-- 使用zookeeper注册中心暴露服务地址 只订阅的方式：register="false"-->
    <dubbo:registry address="zookeeper://192.168.1.111:2181?backup=192.168.1.112:2181,192.168.1.113:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 直连服务提供者：是在消费端进行配置的，而不是在服务提供端，所以这里不需要任何配置 -->
    <dubbo:service retries="0" interface="bhz.dubbo.direct.provider.DirectService" ref="directService" />

</beans>

下面看一下消费者：

因为在两个项目中，所以接口copy一下

package bhz.dubbo.sample.provider;

import java.util.List;

public interface SampleService {

    String sayHello(String name);

    public List getUsers();

}

消费类

package bhz.dubbo.sample.test;

import java.util.List;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import bhz.dubbo.sample.provider.SampleService;

public class Consumer {

    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "sample-consumer.xml" });
        context.start();
            
        SampleService sampleService = (SampleService) context.getBean("sampleService");
        String hello = sampleService.sayHello("tom");
        System.out.println(hello);
        
//        List list = sampleService.getUsers();
//        if (list != null && list.size() > 0) {
//            for (int i = 0; i < list.size(); i++) {
//                System.out.println(list.get(i));
//            }
//        }
        System.in.read();
    }

}

看一下配置文件

<?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="sample-consumer" />

    <dubbo:registry address="zookeeper://192.168.2.2:2181" />

    <!-- 生成远程服务代理，可以像使用本地bean一样使用demoService 检查级联依赖关系 默认为true 当有依赖服务的时候，需要根据需求进行设置 -->
    <dubbo:reference id="sampleService" check="false"
        interface="bhz.dubbo.sample.provider.SampleService" />

</beans>

将项目运行，可以发现，consumer项目，可以直接调用provider中的实现类，

dubbo  提供自带的监控系统，可以对服务进行查看，可以配置路由，权重等跟多功能，

dubbo  的管控台，需要自己去部署，可以参考官方文档

http://dubbo.apache.org/books/dubbo-admin-book/install/admin-console.html

将对应的源码下载下来，进行打包，部署。

 访问ip加端口，如上图的管理后台。官网也提供了相应的运维手册，可以操控操作。

A服务依赖于B服务,A 消费者调用A服务。看一下配置

package bhz.dubbo.dependency.provider;

public interface DependencyService {

    public String dependency() throws Exception;
}

package bhz.dubbo.dependency.provider.impl;

import org.springframework.beans.factory.annotation.Autowired;

import bhz.dubbo.dependency.provider.DependencyService;
import bhz.dubbo.sample.provider.SampleService;

//@Service("dependencyServiceImpl")
//@com.alibaba.dubbo.config.annotation.Service(interfaceClass = bhz.dubbo.dependency.provider.DependencyService.class, protocol = { "dubbo" }, retries = 0)
public class DependencyServiceImpl implements DependencyService {

    // 注入SampleService
    @Autowired
    private SampleService sampleService;

    public String dependency() throws Exception {
        // 这里 我们可能需要调用SampleService，也可能不需要...
        System.out.println(sampleService.sayHello("jack"));
        return "dependency exec";
    }

}

package bhz.dubbo.dependency.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

    public static void main(String[] args) {
        try {
            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                    new String[] { "dependency-provider.xml" });
            context.start();
            
            System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟
        } catch (Exception 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
        ">
    
    <dubbo:annotation package="bhz" />
    
    <bean id="dependencyService" class="bhz.dubbo.dependency.provider.impl.DependencyServiceImpl"/>
    
    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dependency-provider" />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://192.168.2.2:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20890" />
    
    <!-- 注意这里，我们在使用DependencyService的时候，这个服务可能需要依赖某一个服务，比如SampleService 检查级联依赖关系 默认为true 当有依赖服务的时候，需要根据需求进行设置 -->
    <dubbo:reference id="sampleService"  check="true"
        interface="bhz.dubbo.sample.provider.SampleService" />
        
    <dubbo:service retries="0" interface="bhz.dubbo.dependency.provider.DependencyService" ref="dependencyService" /> 

</beans>

这边有一个字段，“check="true"”,代表着如果sampleService不先启动，则会报错。

这边引用了sampleService,上面已经写过了，

下面看一下consumer，soncumer 还是跟helloword的一样，只关心直接调用的A服务，A服务依赖的都不关心，

package bhz.dubbo.dependency.provider;

public interface DependencyService {

    public String dependency() throws Exception;
}

package bhz.dubbo.dependency.provider.impl;

import org.springframework.beans.factory.annotation.Autowired;

import bhz.dubbo.dependency.provider.DependencyService;
import bhz.dubbo.sample.provider.SampleService;

//@Service("dependencyServiceImpl")
//@com.alibaba.dubbo.config.annotation.Service(interfaceClass = bhz.dubbo.dependency.provider.DependencyService.class, protocol = { "dubbo" }, retries = 0)
public class DependencyServiceImpl implements DependencyService {

    // 注入SampleService
    @Autowired
    private SampleService sampleService;

    public String dependency() throws Exception {
        // 这里 我们可能需要调用SampleService，也可能不需要...
        System.out.println(sampleService.sayHello("jack"));
        return "dependency exec";
    }

}

package bhz.dubbo.dependency.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

    public static void main(String[] args) {
        try {
            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                    new String[] { "dependency-provider.xml" });
            context.start();
            
            System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟
        } catch (Exception 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
        ">
    
    <dubbo:annotation package="bhz" />
    
    <bean id="dependencyService" class="bhz.dubbo.dependency.provider.impl.DependencyServiceImpl"/>
    
    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dependency-provider" />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://192.168.2.2:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20890" />
    
    <!-- 注意这里，我们在使用DependencyService的时候，这个服务可能需要依赖某一个服务，比如SampleService 检查级联依赖关系 默认为true 当有依赖服务的时候，需要根据需求进行设置 -->
    <dubbo:reference id="sampleService"  check="true"
        interface="bhz.dubbo.sample.provider.SampleService" />
        
    <dubbo:service retries="0" interface="bhz.dubbo.dependency.provider.DependencyService" ref="dependencyService" /> 

</beans>