Java操作Zookeeper有很多種方式，如zookeeper、zkclient、curator等等，下面介紹下使用zkclient的方式操作Zookeeper。

Maven依賴：

<dependency><groupId>com.101tec</groupId><artifactId>zkclient</artifactId><version>0.11</version></dependency>使用zkclient操作Zookeeper

創(chuàng)建節(jié)點(diǎn)：

@Testpublic void testCreateNode() {//建立連接//zkServers: Zookeeper服務(wù)器IP地址和端口號，如果是集群情況下用逗號分割多個Zookeeper服務(wù)器地址//sessionTimeout: 會話超時時間//connectionTimeout: 連接超時時間ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);//創(chuàng)建數(shù)據(jù)Student student = new Student();student.setName('張三');student.setAge(18);student.setPhone('1585454xxxx');//創(chuàng)建持久節(jié)點(diǎn)zkClient.createPersistent('/p_node', student);//創(chuàng)建持久順序節(jié)點(diǎn)zkClient.createPersistentSequential('/ps_node', student);//創(chuàng)建臨時節(jié)點(diǎn)zkClient.createEphemeral('/e_node', student);//創(chuàng)建臨時順序節(jié)點(diǎn)zkClient.createEphemeralSequential('/ps_node', student);//關(guān)閉客戶端//關(guān)閉客戶端的同時，前面創(chuàng)建的臨時節(jié)點(diǎn)也會被刪除zkClient.close();}

讀取節(jié)點(diǎn)數(shù)據(jù)：

@Testpublic void testReadNodeData() {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);Stat stat = new Stat();Student student = zkClient.readData('/p_node', stat);System.out.println('節(jié)點(diǎn)狀態(tài)信息：' + JSON.toJSONString(student));System.out.println('節(jié)點(diǎn)數(shù)據(jù)：' + JSON.toJSONString(stat));zkClient.close();}//輸出結(jié)果：//節(jié)點(diǎn)狀態(tài)信息：{'age':18,'name':'張三','phone':'1585454xxxx'}//節(jié)點(diǎn)數(shù)據(jù)：{'aversion':0,'ctime':1619165355431,'cversion':0,'czxid':165,'dataLength':260,'ephemeralOwner':0,'mtime':1619165355431,'mzxid':165,'numChildren':0,'pzxid':165,'version':0}

刪除節(jié)點(diǎn)：

@Testpublic void testDeleteNode() {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);//刪除節(jié)點(diǎn)，不能刪除帶有子節(jié)點(diǎn)的節(jié)點(diǎn)zkClient.delete('/p_node');//刪除節(jié)點(diǎn)，遞歸刪除所有子孫節(jié)點(diǎn)zkClient.deleteRecursive('/p_node2');zkClient.close();}

更新節(jié)點(diǎn)數(shù)據(jù)：

@Testpublic void testWriteNodeData() {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);//更新節(jié)點(diǎn)數(shù)據(jù)zkClient.writeData('/p_node', 'myData1');//使用CAS更新節(jié)點(diǎn)數(shù)據(jù)//zkClient.writeData('/p_node', 'myData2', 1);zkClient.close();}

獲取子節(jié)點(diǎn)列表：

@Testpublic void testGetChildNodes() {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);//獲取子節(jié)點(diǎn)列表List<String> childList = zkClient.getChildren('/p_node');childList.stream().forEach(System.out::println);zkClient.close();}節(jié)點(diǎn)監(jiān)聽

Java節(jié)點(diǎn)監(jiān)聽都是永久的，觸發(fā)一次后不會被刪除。

監(jiān)聽節(jié)點(diǎn)的子節(jié)點(diǎn)變化：

@Testpublic void testSubscribeChildChanges() throws IOException {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);zkClient.subscribeChildChanges('/p_node', new IZkChildListener(){//子節(jié)點(diǎn)改變時調(diào)用@Overridepublic void handleChildChange(String parentPath, List<String> currentChilds) throws Exception {System.out.println(parentPath + '子節(jié)點(diǎn)發(fā)生改變');System.out.println('當(dāng)前子節(jié)點(diǎn)列表：' + currentChilds);}});//阻塞客戶端，便于測試System.in.read();}

監(jiān)聽節(jié)點(diǎn)數(shù)據(jù)變化：

@Testpublic void testSubscribeDataChanges() throws IOException {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);zkClient.subscribeDataChanges('/p_node', new IZkDataListener(){//節(jié)點(diǎn)數(shù)據(jù)改變時調(diào)用@Overridepublic void handleDataChange(String dataPath, Object data) throws Exception {System.out.println(dataPath + '節(jié)點(diǎn)數(shù)據(jù)發(fā)生變化');System.out.println('修改后的數(shù)據(jù)為：' + data.toString());}//節(jié)點(diǎn)被刪除時調(diào)用@Overridepublic void handleDataDeleted(String dataPath) throws Exception {System.out.println(dataPath + '節(jié)點(diǎn)已被刪除');}});//阻塞客戶端，便于測試System.in.read();}

監(jiān)聽Zookeeper連接狀態(tài)變化：

@Testpublic void testSubscribeStateChanges() throws IOException {ZkClient zkClient = new ZkClient('127.0.0.1:2181', 60000, 5000);zkClient.subscribeStateChanges(new IZkStateListener(){//當(dāng)zookeeper連接狀態(tài)改變時調(diào)用@Overridepublic void handleStateChanged(Watcher.Event.KeeperState state) throws Exception {System.out.println('當(dāng)前狀態(tài)' + state);}//在zookeeper會話過期并且創(chuàng)建了一個新的會話之后調(diào)用@Overridepublic void handleNewSession() throws Exception {System.out.println('會話過期，已創(chuàng)建新的會話');}//當(dāng)會話不能重新建立時調(diào)用@Overridepublic void handleSessionEstablishmentError(Throwable error) throws Exception {error.printStackTrace();}});//阻塞客戶端，便于測試System.in.read();}

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