dubbo HelloWorld

短命女 2022-02-20 16:45 224阅读 0赞

### Apache Dubbo  是一款高性能、轻量级的开源Java RPC框架，它提供了三大核心能力：面向接口的远程方法调用，智能容错和负载均衡，以及服务自动注册和发现 ###

### ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDE4NTE4_size_16_color_FFFFFF_t_70][] ###

**服务提供者****（****Provider****）**：暴露服务的服务提供方，服务提供者在启动时，向注册中心注册自己提供的服务。

**服务消费者****（****Consumer****）**: 调用远程服务的服务消费方，服务消费者在启动时，向注册中心订阅自己所需的服务，服务消费者，从提供者地址列表中，基于软负载均衡算法，选一台提供者进行调用，如果调用失败，再选另一台调用。

**注册中心****（****Registry****）**：注册中心返回服务提供者地址列表给消费者，如果有变更，注册中心将基于长连接推送变更数据给消费者

**监控中心****（****Monitor****）**：服务消费者和提供者，在内存中累计调用次数和调用时间，定时每分钟发送一次统计数据到监控中心

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### 安装zookeeper(管理中心) ###

[https://archive.apache.org/dist/zookeeper/zookeeper-3.4.11/][https_archive.apache.org_dist_zookeeper_zookeeper-3.4.11]

1、解压

tar -zxvf /home/lk/zookeeper-3.3.6.tar.gz

2、zookeeper-3.3.6.tar.gz目录下创建data文件

3、**mv zoo\_sample.cfg zoo.cfg(把zoo\_sample.cfg改名为zoo.cfg)**

**4、zoo.cfg 下修改 dataDir=/root/zookeeper-3.4.6/data**

1. 启动ZK服务:       sh bin/zkServer.sh start
    2. 查看ZK服务状态: sh bin/zkServer.sh status
    3. 停止ZK服务:       sh bin/zkServer.sh stop
    4. 重启ZK服务:       sh bin/zkServer.sh restart

5、zkCli.sh -server 127.0.0.1:2181  进入zookeeper命令行界面

6、zookeeper常用指令：

1.  ls / （查看某个目录包含的所有文件）
2.  ls2 / （查看目录下详细信息）
3.  create /test "test"(创建znode，并设置初始内容)
4.  Created /test(创建一个新的 znode节点“ test ”)
5.  get /test (获取znode的数据)
6.  set /test "ricky"(修改znode内容)
7.  delete /test (删除znode)
8.  quit -- 退出客户端
9.  help -- 帮助命令

### 安装double-admin（管理中心的，界面显示） ###

1、下载：incubator-dubbo-ops-master

2、修改admin下配置，zookeeper改成自己的配置

3、dubbo-admin 下cmd  执行：mvn clean package

4、启动dubbo : java -jar dubbo-admin-0.0.1-SNAPSHOT.jar

### monitor安装**监控中心** ###

[https://blog.csdn.net/yyhcsfy/article/details/80772476][https_blog.csdn.net_yyhcsfy_article_details_80772476]

### **dubbo - HelloWorld** ###

**1、导入包**

<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <scope>2.6.2</scope>
            </dependency>
    
            <dependency>
                <groupId>org.apache.curator</groupId>
                <artifactId>curator-framework</artifactId>
                <scope>2.12.0</scope>
            </dependency>

目前Curator有2.x.x和3.x.x两个系列的版本，支持不同版本的Zookeeper。其中Curator 2.x.x兼容Zookeeper的3.4.x和3.5.x。而Curator 3.x.x只兼容Zookeeper 3.5.x，并且提供了一些诸如动态重新配置(**注意这是个坑点**)

**2、定义公共父类通信接口，公共类**

public interface UserService {
    
        List<UserAddress> getUserAddress(long playerId);
    }

public class UserAddress implements Serializable {
    
        private Integer id;
        private String userAddress;
        private String userId;
        private String consignee;
        private String phoneNum;
        private String isDefault;
    ｝

**3、提供者**

<?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://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd
    		http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
    	
    	<dubbo:application name="boot-user-service-provider"></dubbo:application>
    	
    	
    	
    	<dubbo:registry protocol="zookeeper" address="192.168.33.80:2181"></dubbo:registry>
    	
    	
    	<dubbo:protocol name="dubbo" port="20882"></dubbo:protocol>
    	
    	
    	<dubbo:service interface="com.stude.dubbo.dubbo.UserService" ref="userServiceImpl"></dubbo:service>
    	
    	
    	<bean id="userServiceImpl" class="com.stude.provider.UserServiceImpl"></bean>
    	
    </beans>

public class UserServiceImpl implements UserService {
    
        @Override
        public List<UserAddress> getUserAddress(long playerId) {
            List<UserAddress> userAddresses = new ArrayList<>();
            for(int i = 0;i< 5;i++){
                UserAddress address = new UserAddress();
                address.setId(i + 1);
                address.setUserAddress("秋名山" + (i + 3) * 7 +"号公路");
                address.setUserId("1111" + i);
                address.setConsignee("幻三");
                address.setPhoneNum((1111 * i) +"");
                address.setIsDefault("有多少事！！");
                userAddresses.add(address);
            }
            return userAddresses;
        }
    }

public static void main(String[] args) throws IOException {
            ClassPathXmlApplicationContext ioc =  new ClassPathXmlApplicationContext("provider.xml");
            ioc.start();
            //阻塞
            System.in.read();
        }

5、消费者

<?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"
    	   xmlns:context="http://www.springframework.org/schema/context"
    	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd
    		http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    
    	<context:component-scan base-package="com.stude.consumer"></context:component-scan>
    
    	
    	<dubbo:application name="order-server-consumer"></dubbo:application>
    
    	
    	 <dubbo:registry address="zookeeper://192.168.33.80:2181"></dubbo:registry>
    	
    
    	<dubbo:reference interface="com.stude.dubbo.dubbo.UserService" id="userService"></dubbo:reference>
    </beans>

@Service
    public class OrderServiceImpl {
    
        @Autowired
        UserService userService;
    
        public List<UserAddress> initOrder(long userId) {
            return userService.getUserAddress(userId);
        }
    }

@SuppressWarnings("resource")
        public static void main(String[] args) {
            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("consumer.xml");
            OrderServiceImpl orderServiceImpl = context.getBean(OrderServiceImpl.class);
            List<UserAddress> mm = orderServiceImpl.initOrder(3);
            System.out.println(new Gson().toJson(mm));
        }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDE4NTE4_size_16_color_FFFFFF_t_70]: /images/20220220/930d056f7de847b1acea4bd01a3e3e1d.png
[https_archive.apache.org_dist_zookeeper_zookeeper-3.4.11]: https://archive.apache.org/dist/zookeeper/zookeeper-3.4.11/
[https_blog.csdn.net_yyhcsfy_article_details_80772476]: https://blog.csdn.net/yyhcsfy/article/details/80772476