zk源码环境搭建

zk不是使用maven管理的。

将zk的src下的代码导入eclipse，lib下的jar包导入工程。

QuorumPeerMain类的main方法是入口，启动了zk的server，参数是conf文件的路径，

例如：org.apache.zookeeper.server.quorum.QuorumPeerMain /usr/local/software/zookeeper-3.4.3/bin/../conf/zoo.cfg

客户端入口程序类是ZooKeeperMain。

测试代码：

import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

public class CreateGroup implements Watcher {
    private static final int SESSION_TIMEOUT = 5000;
    private ZooKeeper zk;
    private CountDownLatch connectedSignal = new CountDownLatch(1);

    public void connect(String hosts) throws IOException, InterruptedException {
        zk = new ZooKeeper(hosts, SESSION_TIMEOUT, this);
        connectedSignal.await();
    }

    @Override
    public void process(WatchedEvent event) { // Watcher interface
        if (event.getState() == KeeperState.SyncConnected) {
            connectedSignal.countDown();
        }
    }

    public void create(String groupName) throws KeeperException,
            InterruptedException {
        String path = "/" + groupName;
        String createdPath = zk.create(path, null/* data */,
                Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        System.out.println("Created " + createdPath);
    }

    public void close() throws InterruptedException {
        zk.close();
    }

    public static void main(String[] args) throws Exception {
        CreateGroup createGroup = new CreateGroup();
        createGroup.connect(args[0]);
        createGroup.create(args[1]);
        createGroup.close();
    }
}

参数：localhost fan，链接本地，创建zkNode：fan。

zk支持在window下开发使用，不建议生产使用。$ZOOKEEPER_HOME/bin/zkCli.cmd -server host:port  访问zk服务器。