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zkClient 操作
根本增删改查代码如下
public class createSession {public static void main(String[] args) {ZkClient zkClient = new ZkClient("119.45.52.68:2181");
System.out.println("connect success");
}
}
public class CreateNode {public static void main(String[] args) {ZkClient zkClient = new ZkClient("119.45.52.68:2181");
System.out.println("connect success");
//true 代表能够递归创立目录
zkClient.createPersistent("/zkclient/persistent/children",true);
System.out.println("create node success");
}
}
public class DeleteNode {public static void main(String[] args) {ZkClient zkClient = new ZkClient("119.45.52.68:2181");
zkClient.deleteRecursive("/zkclient");
System.out.println("success delete node");
}
}
public class GetChildrenChanged {public static void main(String[] args) throws Exception{ZkClient zkClient = new ZkClient("119.45.52.68:2181");
zkClient.createPersistent("/zkClient");
Thread.sleep(1000);
List<String> children = zkClient.getChildren("/zkClient");
System.out.println(children);
zkClient.subscribeChildChanges("/zkClient", new IZkChildListener() {
@Override
public void handleChildChange(String parentPath, List<String> currentChilds) throws Exception {System.out.println("父门路"+parentPath+"以后子门路的"+currentChilds);
}
});
zkClient.createPersistent("/zkClient/child1");
Thread.sleep(1000);
zkClient.delete("/zkClient/child1");
Thread.sleep(Integer.MAX_VALUE);
}
}
public class GetNodeData {public static void main(String[] args) throws Exception{
String path = "/zkclient-node";
ZkClient zkClient = new ZkClient("119.45.52.68:2181");
boolean exist = zkClient.exists(path);
if (!exist){zkClient.createEphemeral(path,"123");
}
zkClient.subscribeDataChanges(path, new IZkDataListener() {
@Override
public void handleDataChange(String dataPath, Object data) throws Exception {System.out.println(dataPath+"节点内容被更新"+data);
}
@Override
public void handleDataDeleted(String dataPath) throws Exception {System.out.println(dataPath+"节点内容被删除");
}
});
Object o = zkClient.readData(path);
System.out.println(o);
zkClient.writeData(path,"4567");
Thread.sleep(2000);
zkClient.delete(path);
Thread.sleep(2000);
}
}
curator 操作 api 应用
public class CreateSession {public static void main(String[] args) {
//curator 第一种创立回话形式
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000,3);
CuratorFramework curatorFramework = CuratorFrameworkFactory.newClient("119.45.52.68:2181",
5000,3000,retryPolicy);
curatorFramework.start();
System.out.println("create session success");
// 第二种形式
CuratorFramework client =CuratorFrameworkFactory.builder()
.connectString("119.45.52.68:2181")
.sessionTimeoutMs(5000)
.sessionTimeoutMs(3000)
.retryPolicy(retryPolicy)
.namespace("base")
.build();
client.start();
System.out.println("createe session2 success");
}
}
public class CreateNode {public static void main(String[] args) throws Exception{RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000,3);
CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString("119.45.52.68:2181")
.sessionTimeoutMs(5000)
.sessionTimeoutMs(3000)
.retryPolicy(retryPolicy)
//.namespace("base")
.build();
client.start();
String path = "/curator/child1";
client.create().creatingParentContainersIfNeeded()
.withMode(CreateMode.PERSISTENT)
.forPath(path,"init".getBytes());
System.out.println("success create node");
}
}
public class DeleteNode {public static void main(String[] args) throws Exception{RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000,3);
CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString("119.45.52.68:2181")
.sessionTimeoutMs(5000)
.sessionTimeoutMs(3000)
.retryPolicy(retryPolicy)
//.namespace("base")
.build();
client.start();
String path = "/curator";
client.delete().deletingChildrenIfNeeded().withVersion(-1).forPath(path);
System.out.println("delete node success");
}
}
public class GetNodeData {public static void main(String[] args) throws Exception{RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000,3);
CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString("119.45.52.68:2181")
.sessionTimeoutMs(5000)
.sessionTimeoutMs(3000)
.retryPolicy(retryPolicy)
//.namespace("base")
.build();
client.start();
String path = "/curator/child1";
client.create().creatingParentContainersIfNeeded()
.withMode(CreateMode.PERSISTENT)
.forPath(path,"init".getBytes());
System.out.println("success create node");
Stat stat = new Stat();
byte [] data = client.getData().storingStatIn(stat).forPath(path);
System.out.println("数据为"+new String(data));
}
}
public class UpdateNodeData {public static void main(String[] args) throws Exception{RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000,3);
CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString("119.45.52.68:2181")
.sessionTimeoutMs(5000)
.sessionTimeoutMs(3000)
.retryPolicy(retryPolicy)
//.namespace("base")
.build();
client.start();
String path = "/curator/child1";
// client.create().creatingParentContainersIfNeeded()
// .withMode(CreateMode.PERSISTENT)
// .forPath(path,"init".getBytes());
// System.out.println("success create node");
Stat stat = new Stat();
byte [] data = client.getData().storingStatIn(stat).forPath(path);
System.out.println("数据为"+new String(data));
int version = client.setData().withVersion(stat.getVersion()).forPath(path).getVersion();
System.out.println("update node"+path+"version"+version);
client.setData().withVersion(stat.getVersion()).forPath(path).getAversion();}
}
最初一行代码会报错，起因是不能设置同样的数据版本。
除了上述的两种 zkclient 和 curatir 的罕用操作。还有一些其余操作都能够去尝试
代码的地址为 https://github.com/zhendiao/deme-code/tree/main/zk
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正文完
