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>