SpringBoot整合dubbo

1.什么是Dubbo

Dubbo是Alibaba开源的分布式服务框架，它最大的特点是按照分层的方式来架构，使用这种方式可以使各个层之间解耦合（或者最大限度地松耦合）。从服务模型的角度来看， Dubbo采用的是一种非常简单的模型，要么是提供方提供服务，要么是消费方消费服务，所以基于这一点可以抽象出服务提供方（Provider）和服务消费方（Consumer）两个角色,负责治理调用。

2.什么是ZooKeeper

ZooKeeper 是一个分布式的，开放源码的分布式应用程序协调服务。它是一个为分布式应用提供一致性服务的软件，提供的功能包括：配置维护、域名服务、分布式同步、组服务等。(在使用dubbo的时候zookeeper。就是充当注册中心，用来管理注册服务，和消费者引用服务负责注册发现)。

架构图如下(来源:github)

服务的提供者，把服务发布到zookeeper当中（相当于注册中心），而消费者需要服务的时候，不需用直接寻找服务的发布者，而是问注册中心索要服务，注册中心把其所需要的地址列表返回给消费者，这样消费者就可以调用生产者发布的服务。

---

开始springboot-整合dubbo测试。

(1)安装zookeeper为了方便，这里采用dokcer镜像的方式

// ps：因为使用官网的镜像下载速度会很慢，这里采用了阿里云镜像加速   下载版本 3.4.11
[root@localhost ~]# docker pull 37y8py0j.mirror.aliyuncs.com/library/zookeeper:3.4.11

下载完成之后，运行镜像

//先查看 有哪一些镜像
[root@localhost ~]# docker images
REPOSITORY                                               TAG                 IMAGE ID            CREATED             SIZE
pshk7r7h.mirror.swr.myhuaweicloud.com/library/rabbitmq   3-management        c4663bdca2cd        8 days ago          189 MB
37y8py0j.mirror.aliyuncs.com/library/elasticsearch       7.1.0               12ad640a1ec0        4 weeks ago         894 MB
docker.io/tomcat                                         7                   bf7d94e5177f        3 months ago        359 MB
docker.io/mysql                                          5.7                 ee7cbd482336        3 months ago        372 MB
37y8py0j.mirror.aliyuncs.com/library/elasticsearch       5.6.9               5c1e1ecfe33a        12 months ago       486 MB
37y8py0j.mirror.aliyuncs.com/library/zookeeper           3.4.11              56d414270ae3        17 months ago       146 MB
37y8py0j.mirror.aliyuncs.com/library/elasticsearch       2.4.0               83ed90c49472        2 years ago         343 MB
//运行镜像  -p 代表后台运行  2182：2181  把虚拟机的端口 映射到 zookeeper应用的2181端口
[root@localhost ~]# docker run --name zoo01 --restart always   -p 2181:2181  -d 56d414270ae3 

(2)创建一个工程------服务的生产者provider

在pom.xml引入相关依赖（我这的spring-boot版本 1.5.21.RELEASE,要引入dubbo-spring-boot-starter 0.1.0版本，一开始引入的是0.2.0版本 ，服务启动发布的时候会报错）

<dependencies>
		
		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-webartifactId>
		dependency>

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-testartifactId>
			<scope>testscope>
		dependency>
		
		
		<dependency>
			<groupId>com.alibaba.bootgroupId>
			<artifactId>dubbo-spring-boot-starterartifactId>
			<version>0.1.0version>
		dependency>

		
		
		<dependency>
			<groupId>com.101tecgroupId>
			<artifactId>zkclientartifactId>
			<version>0.10version>
		dependency>
	dependencies>

编写dubbo的相关配置文件

dubbo.application.name=provider
dubbo.registry.address=zookeeper://192.168.25.131:2181
dubbo.scan.base-packages=com.kuake.springboo.servicet
##制定暴露服务的协议 (可以省略)
spring.dubbo.protocol.name=dubbo
###指定暴露服务的端口(可以省略，但是如果生产者都要提供服务，就需要设置不同的端口不然端口会冲突)
spring.dubbo.protocol.port=20880

编写提供的服务代码：

package com.kuake.springboot.service;

/**
 * @author hao
 * @create 2019-06-12 ${TIM}
 */
public interface ProviderService {
    //服务接口
    public String providerService();
}

实现类：

package com.kuake.springboot.service.impl;

import com.alibaba.dubbo.config.annotation.Service;
import com.kuake.springboot.service.ProviderService;
import org.springframework.stereotype.Component;

/**
 * @author hao
 * @create 2019-06-12 ${TIM}
 */
@Component
@Service// 通过注解暴露服务 与下面配置的方式相同(注意：这个是dubbo包下的@Service注解)

 /*
 
 
 
 
 
 
*/
public class ProviderServiceImpl implements ProviderService {

    @Override
    public String providerService() {
        return "我来提供服务啦";
    }
}

（2）创建一个新工程-----服务的消费者consumer

同样引入相关依赖

<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-webartifactId>
		dependency>

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-testartifactId>
			<scope>testscope>
		dependency>

		
        
        
        <dependency>
            <groupId>com.alibaba.bootgroupId>
            <artifactId>dubbo-spring-boot-starterartifactId>
            <version>0.1.0version>
        dependency>

        
        
        <dependency>
            <groupId>com.101tecgroupId>
            <artifactId>zkclientartifactId>
            <version>0.10version>
        dependency>

编写配置文件 ，配置dubbo

####应用名称
dubbo.application.name=consumer
### 注册地址
dubbo.registry.address=zookeeper://192.168.25.131:2181

编写消费者的代码：
包结构如下：（注意：服务的接口全限定名要与生生产者那边的权限定名要相同，简单来说就是要放在相同的目录接口下面）

/**
 * @author hao
 * @create 2019-06-12 ${TIM}
 */
@Service
public class UserService {
	/*
	
	
	/dubbo:registry
	
	 */
    @Reference //从注册中心引用服务，与传统配置文件的方法类似
    private ProviderService providerService;
    public String getService(){
    	//使用 服务生产者提供的服务
        return  providerService.providerService();
    }
}

测试代码：

package com.kuake.springboot;

import com.kuake.springboot.userservice.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootDubboConsumerApplicationTests {

	@Autowired
	UserService userService;
	@Test
	public void contextLoads() {
		System.out.println("我要获得服务");
        String service = userService.getService();
        System.out.println(service);
    }

}

进行测试：

（1）运行消息的生产者，发布服务：

\instantclient-sqlplus-windows.x64-12.1.0.1.0\instantclient_12_1;C:\Pr;gram Files (x86)\Intel\OpenCL SDK\3.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x64;D:\Git\cmd;D:\SSH_SecureShell;.
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:java.io.tmpdir=C:\Users\ADMINI~1\AppData\Local\Temp\
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:java.compiler=<NA>
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:os.name=Windows 7
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:os.arch=amd64
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:os.version=6.1
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:user.name=Administrator
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:user.home=C:\Users\Administrator
2019-06-13 15:22:02.144  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Client environment:user.dir=F:\ideaworkplace\springboot-dubbo
2019-06-13 15:22:02.145  INFO 6844 --- [clientConnector] org.apache.zookeeper.ZooKeeper           : Initiating client connection, connectString=192.168.25.131:2181 sessionTimeout=30000 watcher=org.I0Itec.zkclient.ZkClient@3075b107
2019-06-13 15:22:02.156  INFO 6844 --- [clientConnector] org.I0Itec.zkclient.ZkClient             : Waiting for keeper state SyncConnected
2019-06-13 15:22:02.160  INFO 6844 --- [68.25.131:2181)] org.apache.zookeeper.ClientCnxn          : Opening socket connection to server 192.168.25.131/192.168.25.131:2181. Will not attempt to authenticate using SASL (unknown error)
2019-06-13 15:22:02.162  INFO 6844 --- [68.25.131:2181)] org.apache.zookeeper.ClientCnxn          : Socket connection established to 192.168.25.131/192.168.25.131:2181, initiating session
2019-06-13 15:22:02.178  INFO 6844 --- [68.25.131:2181)] org.apache.zookeeper.ClientCnxn          : Session establishment complete on server 192.168.25.131/192.168.25.131:2181, sessionid = 0x1000221ed62000d, negotiated timeout = 30000
2019-06-13 15:22:02.180  INFO 6844 --- [tor-EventThread] org.I0Itec.zkclient.ZkClient             : zookeeper state changed (SyncConnected)
2019-06-13 15:22:02.183  INFO 6844 --- [           main] c.a.d.r.zookeeper.ZookeeperRegistry      :  [DUBBO] Register: dubbo://192.168.21.1:20880/com.kuake.springboot.service.ProviderService?anyhost=true&application=provider&dubbo=2.0.1&generic=false&interface=com.kuake.springboot.service.ProviderService&methods=providerService&pid=6844&side=provider&timestamp=1560410521877, dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:22:02.198  INFO 6844 --- [           main] c.a.d.r.zookeeper.ZookeeperRegistry      :  [DUBBO] Subscribe: provider://192.168.21.1:20880/com.kuake.springboot.service.ProviderService?anyhost=true&application=provider&category=configurators&check=false&dubbo=2.0.1&generic=false&interface=com.kuake.springboot.service.ProviderService&methods=providerService&pid=6844&side=provider&timestamp=1560410521877, dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:22:02.219  INFO 6844 --- [           main] c.a.d.r.zookeeper.ZookeeperRegistry      :  [DUBBO] Notify urls for subscribe url provider://192.168.21.1:20880/com.kuake.springboot.service.ProviderService?anyhost=true&application=provider&category=configurators&check=false&dubbo=2.0.1&generic=false&interface=com.kuake.springboot.service.ProviderService&methods=providerService&pid=6844&side=provider&timestamp=1560410521877, urls: [empty://192.168.21.1:20880/com.kuake.springboot.service.ProviderService?anyhost=true&application=provider&category=configurators&check=false&dubbo=2.0.1&generic=false&interface=com.kuake.springboot.service.ProviderService&methods=providerService&pid=6844&side=provider&timestamp=1560410521877], dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:22:02.270  INFO 6844 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2019-06-13 15:22:02.275  INFO 6844 --- [           main] c.k.s.SpringbootDubboProviderApplication : Started SpringbootDubboProviderApplication in 4.762 seconds (JVM running for 6.592)
2019-06-13 15:24:29.233  WARN 6844 --- [ver worker #1-1] c.a.d.remoting.transport.AbstractServer  :  [DUBBO] All clients has discontected from /192.168.21.1:20880. You can graceful shutdown now., dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:24:29.234  INFO 6844 --- [:20880-thread-3] c.a.d.rpc.protocol.dubbo.DubboProtocol   :  [DUBBO] disconected from /192.168.21.1:9130,url:dubbo://192.168.21.1:20880/com.kuake.springboot.service.ProviderService?anyhost=true&application=provider&bind.ip=192.168.21.1&bind.port=20880&channel.readonly.sent=true&codec=dubbo&dubbo=2.0.1&generic=false&heartbeat=60000&interface=com.kuake.springboot.service.ProviderService&methods=providerService&pid=6844&side=provider&timestamp=1560410521877, dubbo version: 2.0.1, current host: 192.168.21.1

控制台打印了注册服务成功了url地址

（2）消费者，引用服务进行测试

package com.kuake.springboot;

import com.kuake.springboot.userservice.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootDubboConsumerApplicationTests {

	@Autowired
	UserService userService;
	@Test
	public void contextLoads() {
		System.out.println("我要获得服务");
        String service = userService.getService();
        System.out.println(service);
    }

}

运行上述代码：（控制台打印）

6.657 seconds (JVM running for 8.246)
我要获得服务
我来提供服务啦
2019-06-13 15:24:19.196  INFO 7648 --- [bboShutdownHook] com.alibaba.dubbo.config.AbstractConfig  :  [DUBBO] Run shutdown hook now., dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:24:19.197  INFO 7648 --- [bboShutdownHook] c.a.d.r.support.AbstractRegistryFactory  :  [DUBBO] Close all registries [zookeeper://192.168.25.131:2181/com.alibaba.dubbo.registry.RegistryService?application=consumer&dubbo=2.0.1&interface=com.alibaba.dubbo.registry.RegistryService&pid=7648&timestamp=1560410656161], dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:24:19.197  INFO 7648 --- [bboShutdownHook] c.a.d.r.zookeeper.ZookeeperRegistry      :  [DUBBO] Destroy registry:zookeeper://192.168.25.131:2181/com.alibaba.dubbo.registry.RegistryService?application=consumer&dubbo=2.0.1&interface=com.alibaba.dubbo.registry.RegistryService&pid=7648&timestamp=1560410656161, dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:24:19.197  INFO 7648 --- [bboShutdownHook] c.a.d.r.zookeeper.ZookeeperRegistry      :  [DUBBO] Unregister: consumer://192.168.21.1/com.kuake.springboot.service.ProviderService?application=consumer&category=consumers&check=false&dubbo=2.0.1&interface=com.kuake.springboot.service.ProviderService&methods=providerService&pid=7648&side=consumer&timestamp=1560410656099, dubbo version: 2.0.1, current host: 192.168.21.1
2019-06-13 15:24:19.201  INFO 7648 --- [       Thread-4] o.s.w.c.s.GenericWebApplicationContext   : Closing org.springframework.web.context.support.GenericWebApplicationContext@568ff82: startup date [Thu Jun 13 15:24:12 CST 2019]; root of context hierarchy
2019-06-13 15:24:19.207  INFO 7648 --- [       Thread-4] f.a.ReferenceAnnotationBeanPostProcessor : <dubbo:reference object="com.alibaba.dubbo.common.bytecode.proxy0@5eefa415" singleton="true" interface="com.kuake.springboot.service.ProviderService" uniqueServiceName="com.kuake.springboot.service.ProviderService" filter="" listener="" generic="false" id="com.kuake.springboot.service.ProviderService" /> was destroying!
2019-06-13 15:24:19.208  INFO 7648 --- [       Thread-4] f.a.ReferenceAnnotationBeanPostProcessor : class com.alibaba.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor was destroying!

成功调用了UserService#getService方法，而getService方法是远程调用生产者发布到注册中心的服务，测试成功