Dubbo+Zookeeper demo实现

一、安装zookeeper，集群模式配置

自行百度，下载解压

（由于机器有限，本文使用一台机器不同端口来模拟实现集群模式）

1、创建zookeepere文件夹

2、zookeeper文件夹下新建server1、server2、server3三个文件夹

3、复制解压后的zookeeper文件夹到server1、server2、server3这三个文件夹下

4、再分别在这三个文件夹下创建data、dataLog两个目录

完成后如下图

进入zookeeper-3.4.14/conf文件夹，重命名zoo-sample.cfg为zoo.cfg,并修改配置如下：

# 心跳检测时间间隔，单位ms
tickTime = 2000

#zookeeper集群中包含多台server,其中一台为leader,其余为follower,initLimit参数配置初始化连接时，follower和leader之间的最长心跳时间，设置为5，则表示时间限制为5倍tickTime
initLimit = 5

#syncLimit配置leader和follower之间发送消息、请求和应答的最大时间长度，设置为2，则说明时间限制为2倍tickTime
syncLimit = 2

dataDir=/Library/zookeeper/server1/data
dataLogDir=/Library/zookeeper/server1/dataLog

clientPort=2181
server.1 = 127.0.0.1:2222:2225
server.2 = 127.0.0.1:3333:3335
server.3 = 127.0.0.1:4444:4445

其中dataDir为data文件夹所在的位置, dataLogDir为dataLog文件夹所在的位置

server1里的clientPort=2181, server2里的clientPort=2182, server3里的clientPort=2183

在data文件夹里新增myid文件，文件内容为serverID, 如server1的myid文件的内容为1，server2的myid文件内容为2，以此类推

终端进入zookeeper3.4.14/bin目录下，执行./zkServer.sh start启动zookeeper服务，执行./zkServer.sh status查看服务状态，当状态为一个leader, 2个follower时，则启动成功

二、Dubbo服务生产者

项目结构如下

dubbotestapi项目下创建User对象

public class User implements Serializable{
    private static final long serialVersionUID = 5264854701181085862L;

    private Long id;
    private String username;
    private String password;
    private Integer age;

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getAge() {
        return age;
    }

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

创建userAPI接口

public interface UserAPI {
    public List getUsers();
    String sayHello(String name);
}

将dubbotestapi打包生成jar引入dubbotestservice项目，并引入其他依赖的jar包

            io.netty
            netty-all
            4.1.34.Final
        

        
            com.alibaba
            dubbo
            2.6.6
            
                
                    spring-context
                    org.springframework
                
            
        

        
            org.apache.zookeeper
            zookeeper
            3.4.14
        

        
            com.github.sgroschupf
            zkclient
            0.1
            
                
                    zookeeper
                    org.apache.zookeeper
                
                
                    log4j
                    log4j
                
            
        

        
            org.apache.curator
            curator-framework
            4.0.1
            
                
                    zookeeper
                    org.apache.zookeeper
                
                
                    slf4j-api
                    org.slf4j
                
            
        

配置dubbo-provider.xml文件

添加userAPI接口的实现类userAPIImpl文件

public class UserAPIImpl implements UserAPI{

    public List getUsers() {
        List list = new ArrayList();

        for (int i=0;i<10;i++){
            User user = new User();
            user.setUsername("username_" + i);
            user.setId(Long.valueOf(i+1));
            user.setAge(10 + i);
            user.setPassword("123456");

            list.add(user);
        }

        return list;
    }

    public String sayHello(String name) {
        return "11111";
    }

三、Dubbo服务消费者

引入依赖的jar包

      com.qjj
      dubbotest.api
      1.0-SNAPSHOT
    

    
      org.springframework
      spring-context
      4.3.12.RELEASE
    

    
      org.springframework
      spring-core
      4.3.12.RELEASE
    

    
      org.springframework
      spring-web
      4.3.12.RELEASE
    

    
      org.springframework
      spring-beans
      4.3.12.RELEASE
    

    
      org.springframework
      spring-jdbc
      4.3.12.RELEASE
    

    
      org.springframework
      spring-oxm
      4.3.12.RELEASE
    

    
      org.springframework
      spring-tx
      4.3.12.RELEASE
    

    
      org.springframework
      spring-webmvc
      4.3.12.RELEASE
    

    
      org.springframework
      spring-aop
      4.3.12.RELEASE
    

    
      org.springframework
      spring-test
      4.3.12.RELEASE
    

    
      io.netty
      netty-all
      4.1.34.Final
    

    
      com.alibaba
      dubbo
      2.6.6
      
        
          spring-context
          org.springframework
        
      
    

    
      org.apache.zookeeper
      zookeeper
      3.4.14
    

    
      com.github.sgroschupf
      zkclient
      0.1
      
        
          log4j
          log4j
        
        
          zookeeper
          org.apache.zookeeper
        
      
    

    
      org.apache.curator
      curator-framework
      4.2.0
      
        
          zookeeper
          org.apache.zookeeper
        
      
    

创建dubbo-consumer.xml文件

创建测试类

public class consumer {
    public static void main(String[] args) throws IOException {

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[] { "dubbo-consumer.xml" });
        context.start();

        UserAPI userAPI = context.getBean(UserAPI.class);
        String hello = userAPI.sayHello("qijiaojiao");
        System.out.println(hello);

        List list = userAPI.getUsers();
        if (list != null && list.size() > 0) {
            for (int i = 0; i < list.size(); i++) {
                System.out.println(list.get(i));
            }
        }

    }
}

运行测试类，执行结果如下：