zookeeper+Springboot实现服务器动态上下线监听教程详解

 create /servers "servers"

 <!--引入对应的zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.7.1</version>
        </dependency>

package com.canrioyuan.zookeepertest.zkcase1;
 
import org.apache.zookeeper.*;
 
import java.io.IOException;
 
//分布式服务器端
public class DistributeServer {
 
    //对应的zookeeper客户端连接,连接之间不能存在空格
    private String connectString = "192.168.154.133:2181,192.168.154.134:2181,192.168.154.135:2181";
    //超时时间，我们设置成2s
    private int sessionTimeout = 2000;
    //声明zookeeper服务器端
    private ZooKeeper zkServer;
 
    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
        //1.获取zookeeper连接
        DistributeServer distributeServer = new DistributeServer();
        distributeServer.getConnect();
 
        //2.注册服务器
        distributeServer.register(args[0]);
 
 
        //3.启动
        distributeServer.business(args[0]);
    }
 
    private void business(String url) throws InterruptedException {
        System.out.println("url为" + url + "的服务器正在工作中");
        Thread.sleep(Long.MAX_VALUE);
    }
 
    private void register(String url) throws InterruptedException, KeeperException {
        //创建一个节点
        zkServer.create("/servers/" + url, url.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);
 
        System.out.println("url为" + url + "的服务器已经上线");
    }
 
 
    //创建到zookeeper的客户端连接
    private void getConnect() throws IOException {
        zkServer = new ZooKeeper(connectString, sessionTimeout, new Watcher() {
            @Override
            public void process(WatchedEvent watchedEvent) {
 
            }
        });
    }
}

package com.canrioyuan.zookeepertest.zkcase1;
 
import org.apache.zookeeper.*;
 
import java.io.IOException;
 
import java.util.List;
 
//分布式客户端
public class DistributeClient {
    //对应的zookeeper客户端连接,连接之间不能存在空格
    private String connectString = "192.168.154.133:2181,192.168.154.134:2181,192.168.154.135:2181";
    //超时时间，我们设置成2s
    private int sessionTimeout = 2000;
    //声明zookeeper客户端
    private static ZooKeeper zkClient;
    private final String PARENT_NODE = "/servers";
 
    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
        //1.获取zookeeper连接
        DistributeClient distributeClient = new DistributeClient();
        distributeClient.getConnect();
 
        //2.获取servers中的子节点信息
        distributeClient.getServerList();
 
        //3.业务逻辑
        distributeClient.business();
    }
 
    private void business() throws InterruptedException {
        System.out.println("客户端正在工作中......");
        Thread.sleep(Long.MAX_VALUE);
    }
 
    private void getServerList() throws InterruptedException, KeeperException {
        List<String> children = zkClient.getChildren(PARENT_NODE, true);
 
        for (String child : children) {
            System.out.println(child);
        }
    }
 
    private void getConnect() throws IOException {
        zkClient = new ZooKeeper(connectString, sessionTimeout, new Watcher() {
            @Override
            public void process(WatchedEvent watchedEvent) {
                try {
 
                    getServerList();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (KeeperException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}