ZooKeeper(3.4.5) - 原生 API 的简单示例

一、创建会话

1. 创建一个基本的ZooKeeper会话实例

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.KeeperState;



/**

 * 创建一个基本的ZooKeeper会话实例

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        

        /**

         * ZooKeeper客户端和服务器会话的建立是一个异步的过程

         * 构造函数在处理完客户端的初始化工作后立即返回，在大多数情况下，并没有真正地建立好会话

         * 当会话真正创建完毕后，Zookeeper服务器会向客户端发送一个事件通知

         */

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    connectedSignal.countDown();

                }

            }

        });

        System.out.println("State1: " + zk.getState());    // CONNECTING

        

        connectedSignal.await();        

        System.out.println("State2: " + zk.getState());    // CONNECTED

        

        zk.close();

        System.out.println("State3: " + zk.getState());    // CLOSED

    }



}

2. 创建一个复用sessionId和sessionPasswd的Zookeeper对象示例

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.KeeperState;



/**

 * 创建一个复用sessionId和sessionPasswd的ZooKeeper对象示例

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);        

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    connectedSignal.countDown();

                }

            }

        });

        

        connectedSignal.await();

        long sessionId = zk.getSessionId();

        byte[] passwd = zk.getSessionPasswd();

        zk.close();

                

        final CountDownLatch anotherConnectedSignal = new CountDownLatch(1);

        ZooKeeper newZk = new ZooKeeper(

                "192.168.1.109:2181", 

                5000, 

                new Watcher() {

                    @Override

                    public void process(WatchedEvent event) {

                        if (event.getState() == KeeperState.SyncConnected) {

                            anotherConnectedSignal.countDown();

                        }

                    }

                },

                sessionId, 

                passwd);

        

        anotherConnectedSignal.await();

        newZk.close();

    }



}

 

二、创建节点

1. 使用同步API创建一个ZNode节点

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;



/**

 * 使用同步API创建一个ZNode节点

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);       

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    connectedSignal.countDown();

                }

            }

        });

        connectedSignal.await();

        

        String path = zk.create(

                "/zk-huey", 

                "hello".getBytes(), 

                Ids.OPEN_ACL_UNSAFE, 

                CreateMode.PERSISTENT

        );

        System.out.println(path + " is created.");

        

        zk.close();

    }



}

2. 使用异步API创建一个ZNode节点

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;



/**

 * 使用异步API创建一个ZNode节点

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);       

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    connectedSignal.countDown();

                }

            }

        });

        connectedSignal.await();

        

        zk.create(

                "/zk-huey", 

                "hello".getBytes(), 

                Ids.OPEN_ACL_UNSAFE, 

                CreateMode.PERSISTENT_SEQUENTIAL,

                new AsyncCallback.StringCallback() {

                    @Override

                    public void processResult(int rc, String path, Object ctx, String name) {

                        // 服务器响应吗

                        System.out.println("ResultCode: " + rc);

                        // 接口调用时传入API的数据节点的路径参数值

                        System.out.println("Znode: " + path);

                        // 接口调用时传入API的ctx参数值

                        System.out.println("Context: " + (String)ctx);

                        // 实际在服务端创建的节点名

                        System.out.println("Real Path: " + name);

                    }

                },

                "The Context"

        );

        

        zk.close();

    }



}

 

三、删除节点

1. 使用同API删除一个ZNode节点

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.KeeperState;



/**

 * 使用同步API删除一个ZNode节点

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);       

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    connectedSignal.countDown();

                }

            }

        });

        connectedSignal.await();

        

        zk.delete("/zk-huey", -1);

        

        zk.close();

    }



}

2. 使用异步API删除一个ZNode节点

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.KeeperState;



/**

 * 使用异步API删除一个ZNode节点

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);       

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    connectedSignal.countDown();

                }

            }

        });

        connectedSignal.await();

        

        zk.delete(

                "/zk-huey", 

                -1,

                new AsyncCallback.VoidCallback() {

                    @Override

                    public void processResult(int rc, String path, Object ctx) {

                        System.out.println("ResultCode: " + rc);

                        System.out.println("Znode: " + path);

                        System.out.println("Context: " + (String)ctx);

                    }

                },

                "The Context"

        );

        

        zk.close();

    }



}

 

四、获取子节点列表

1. 使用同步API获取子节点列表

package com.huey.dream.demo;



import java.util.List;

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.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;

import org.apache.zookeeper.data.Stat;



/**

 * 使用同步API获取子节点列表

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, null);

        zk.register(new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    } else if (event.getType() == EventType.NodeChildrenChanged) {                    

                        try {

                            System.out.println("NodeChildrenChanged.");

                            List<String> children = zk.getChildren(event.getPath(), true);

                            System.out.println("Children: " + children);

                        } catch (KeeperException e) {

                            e.printStackTrace();

                        } catch (InterruptedException e) {

                            e.printStackTrace();

                        }

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.create("/zk-huey", "root".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        zk.create("/zk-huey/node1", "node1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        zk.create("/zk-huey/node2", "node2".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        

        Stat stat = new Stat();

        List<String> children = zk.getChildren("/zk-huey", 

                true,    // 注册默认的Watcher，当子节点类别发送变更的话，向客户端发送通知

                stat    // 用于描述节点状态信息

        );

        System.out.println("Stat: " + stat);

        System.out.println("Children: " + children);

        

        zk.create("/zk-huey/node3", "node3".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        

        Thread.sleep(10 * 1000);

        zk.close();

    }



}

结果输出：

Stat: 4294967436,4294967436,1425201236879,1425201236879,0,2,0,0,4,2,4294967438



Children: [node2, node1]

NodeChildrenChanged.

State: CONNECTED

Children: [node2, node3, node1]

2. 使用异步API获取子节点列表

package com.huey.dream.demo;



import java.util.List;

import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.KeeperException;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;

import org.apache.zookeeper.data.Stat;



/**

 * 使用异步API获取子节点列表

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, null);

        zk.register(new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    } else if (event.getType() == EventType.NodeChildrenChanged) {                    

                        try {

                            System.out.println("NodeChildrenChanged.");

                            List<String> children = zk.getChildren(event.getPath(), true);

                            System.out.println("Children: " + children);

                        } catch (KeeperException e) {

                            e.printStackTrace();

                        } catch (InterruptedException e) {

                            e.printStackTrace();

                        }

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.create("/zk-huey", "root".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        zk.create("/zk-huey/node1", "node1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        zk.create("/zk-huey/node2", "node2".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        

        zk.getChildren("/zk-huey", 

                true,

                new AsyncCallback.Children2Callback() {

                    @Override

                    public void processResult(int rc, String path, Object ctx,

                            List<String> children, Stat stat) {

                        System.out.println("ResultCode: " + rc);

                        System.out.println("ZNode: " + path);

                        System.out.println("Context: " + ctx);

                        System.out.println("Children: " + children);

                        System.out.println("Stat: " + stat);

                    }

                },

                "The Context"

        );

        

        zk.create("/zk-huey/node3", "node3".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        

        Thread.sleep(10 * 1000);

        zk.close();

    }



}

 

五、获取节点数据内容

1. 使用同步API获取节点数据内容

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;



/**

 * 使用同步API获取节点数据内容

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        byte[] nodeData = zk.getData("/zk-huey", false, null);

        System.out.println("NodeData: " + new String(nodeData));

        

        zk.close();

    }



}

2. 使用异步API获取节点数据内容

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;

import org.apache.zookeeper.data.Stat;



/**

 * 使用异步API获取节点数据内容

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        zk.getData(

                "/zk-huey", 

                false, 

                new AsyncCallback.DataCallback() {

                    @Override

                    public void processResult(int rc, String path, Object ctx, byte[] data,

                            Stat stat) {

                        System.out.println("ResultCode: " + rc);

                        System.out.println("ZNode: " + path);

                        System.out.println("Context: " + ctx);

                        System.out.println("NodeData: " + new String(data));

                        System.out.println("Stat: " + stat);

                    }

                },

                "The Context"

        );

        

        zk.close();

    }



}

 

六、更新数据

1. 使用同步API更新节点数据内容

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;



/**

 * 使用同步API更新节点数据内容

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        byte[] nodeData = zk.getData("/zk-huey", false, null);

        System.out.println("NodeData: " + nodeData);

        

        zk.setData("/zk-huey", "world".getBytes(), -1);

        nodeData = zk.getData("/zk-huey", false, null);

        System.out.println("NodeData: " + nodeData);

        

        zk.close();

    }



}

2. 使用异步API更新节点数据内容

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;

import org.apache.zookeeper.data.Stat;



/**

 * 使用异步API更新节点数据内容

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        byte[] nodeData = zk.getData("/zk-huey", false, null);

        System.out.println("NodeData: " + nodeData);

        

        zk.setData(

                "/zk-huey", 

                "world".getBytes(), 

                -1,

                new AsyncCallback.StatCallback() {

                    @Override

                    public void processResult(int rc, String path, Object ctx, Stat stat) {

                        System.out.println("ResultCode: " + rc);

                        System.out.println("ZNode: " + path);

                        System.out.println("Context: " + ctx);

                        System.out.println("Stat: " + stat);

                    }

                },

                "The Context"

        );

        

        zk.close();

    }



}

 

七、判断节点是否存在

1. 使用同步API判断节点是否存在

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.ZooDefs.Ids;

import org.apache.zookeeper.data.Stat;



/**

 * 使用同步API判断节点是否存在

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    }

                }

            }

        });

        connectedSignal.await();

        

        Stat stat = zk.exists("/zk-huey", false);

        if (stat == null) {

            zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        } else {

            System.out.println("Stat: " + stat);

        }

        

        zk.close();

    }



}

2. 使用异步API判断节点是否存在

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.AsyncCallback;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.Watcher.Event.EventType;

import org.apache.zookeeper.Watcher.Event.KeeperState;

import org.apache.zookeeper.data.Stat;



/**

 * 使用异步API判断节点是否存在

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {            

            @Override

            public void process(WatchedEvent event) {

                if (event.getState() == KeeperState.SyncConnected) {

                    if (event.getType() == EventType.None

                            && event.getPath() == null) {

                        connectedSignal.countDown();

                    }

                }

            }

        });

        connectedSignal.await();

        

        zk.exists(

                "/zk-huey", 

                false,

                new AsyncCallback.StatCallback() {

                    @Override

                    public void processResult(int rc, String path, Object ctx, Stat stat) {

                        System.out.println("ResultCode: " + rc);

                        System.out.println("ZNode: " + path);

                        System.out.println("Context: " + ctx);

                        System.out.println("Stat: " + stat);

                    }

                },

                "The Context"

        );

        

        zk.close();

    }



}

 

八、权限控制

package com.huey.dream.demo;



import java.util.concurrent.CountDownLatch;



import org.apache.zookeeper.CreateMode;

import org.apache.zookeeper.WatchedEvent;

import org.apache.zookeeper.Watcher;

import org.apache.zookeeper.ZooKeeper;

import org.apache.zookeeper.ZooDefs.Ids;



/**

 * ZooKeeper权限控制

 * @author  huey

 * @version 1.0 

 * @created 2015-3-1

 */

public class ZKDemo {

    

    public static void main(String[] args) throws Exception {

        

        /**

         * 使用含有权限信息的zookeeper会话创建数据节点

         */

        final CountDownLatch connectedSignal = new CountDownLatch(1);

        ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {

            @Override

            public void process(WatchedEvent event) {

                connectedSignal.countDown();

            }

        });

        connectedSignal.await();

        zk.addAuthInfo("digest", "huey:123".getBytes());

        zk.create("/zk-huey", "hello".getBytes(), Ids.CREATOR_ALL_ACL, CreateMode.PERSISTENT);

        zk.close();

        

        /**

         * 使用无权限信息的zookeeper会话访问含有权限信息的数据节点

         */

        try {

            final CountDownLatch signal = new CountDownLatch(1);

            ZooKeeper zk1 = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {

                @Override

                public void process(WatchedEvent event) {

                    signal.countDown();

                }

            });

            signal.await();

            zk1.getData("/zk-huey", false, null);

            System.out.println("NodeData: " + new String(zk1.getData("/zk-huey", false, null)));

            zk1.close();

        } catch (Exception e) {

            System.out.println("Failed to delete Znode: " + e.getMessage());

        }

        

        /**

         * 使用错误权限信息的zookeeper会话访问含有权限信息的数据节点

         */

        try {

            final CountDownLatch signal = new CountDownLatch(1);

            ZooKeeper zk2 = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {

                @Override

                public void process(WatchedEvent event) {

                    signal.countDown();

                }

            });

            signal.await();

            zk2.addAuthInfo("digest", "huey:abc".getBytes());

            System.out.println("NodeData: " + new String(zk2.getData("/zk-huey", false, null)));

            zk2.close();

        } catch (Exception e) {

            System.out.println("Failed to delete Znode: " + e.getMessage());

        }

        

        /**

         * 使用正确权限信息的zookeeper会话访问含有权限信息的数据节点

         */

        try {

            final CountDownLatch signal = new CountDownLatch(1);

            ZooKeeper zk3 = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {

                @Override

                public void process(WatchedEvent event) {

                    signal.countDown();

                }

            });

            signal.await();

            zk3.addAuthInfo("digest", "huey:123".getBytes());

            System.out.println("NodeData: " + new String(zk3.getData("/zk-huey", false, null)));

            zk3.close();

        } catch (Exception e) {

            System.out.println("Failed to delete Znode: " + e.getMessage());

        }

    }



}

结果输出：

Failed to delete Znode: KeeperErrorCode = NoAuth for /zk-huey

Failed to delete Znode: KeeperErrorCode = NoAuth for /zk-huey

NodeData: hello