Java多進(jìn)程與ZooKeeper服務(wù)發(fā)現(xiàn)

在Java中實現(xiàn)多進(jìn)程與ZooKeeper服務(wù)發(fā)現(xiàn)通常需要使用ZooKeeper客戶端庫來與ZooKeeper集群進(jìn)行交互。以下是一個簡單的示例代碼，演示如何在Java中實現(xiàn)多進(jìn)程與ZooKeeper服務(wù)發(fā)現(xiàn)：

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

import java.util.List;

public class ZooKeeperServiceDiscovery {

    private static final String ZOOKEEPER_HOST = "localhost:2181";
    private static final String SERVICE_PATH = "/services";

    private ZooKeeper zooKeeper;

    public ZooKeeperServiceDiscovery() throws Exception {
        zooKeeper = new ZooKeeper(ZOOKEEPER_HOST, 5000, new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                // Handle ZooKeeper events
            }
        });
    }

    public void registerService(String serviceName, String serviceAddress) throws Exception {
        String serviceNode = SERVICE_PATH + "/" + serviceName;
        if (zooKeeper.exists(serviceNode, false) == null) {
            zooKeeper.create(serviceNode, serviceAddress.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
        }
    }

    public List<String> discoverServices(String serviceName) throws Exception {
        String serviceNode = SERVICE_PATH + "/" + serviceName;
        return zooKeeper.getChildren(serviceNode, false);
    }

    public void close() throws Exception {
        zooKeeper.close();
    }

    public static void main(String[] args) throws Exception {
        ZooKeeperServiceDiscovery discovery = new ZooKeeperServiceDiscovery();
        
        // Register a service
        discovery.registerService("exampleService", "localhost:8080");
        
        // Discover services
        List<String> services = discovery.discoverServices("exampleService");
        for (String service : services) {
            System.out.println("Discovered service: " + service);
        }
        
        discovery.close();
    }

}

在上面的示例中，我們首先創(chuàng)建了一個ZooKeeperServiceDiscovery類，該類封裝了與ZooKeeper的交互操作。在main方法中，我們創(chuàng)建了一個ZooKeeperServiceDiscovery實例，并使用registerService方法注冊了一個服務(wù)，并使用discoverServices方法發(fā)現(xiàn)了該服務(wù)。最后關(guān)閉了ZooKeeper連接。

需要注意的是，ZooKeeper服務(wù)發(fā)現(xiàn)在實際項目中常常結(jié)合使用其他框架或工具來實現(xiàn)更復(fù)雜的功能，比如使用Spring Cloud等。同時，需要確保ZooKeeper集群的正常運行，并考慮一些異常情況的處理。