ZooKeeper Combat (iv)-zookeeper API usage

This article mainly describes how to use the Zookeeper official API to manipulate zookeeper. maven Dependency

<dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper< /artifactid>
            <version>3.4.8</version>
        </dependency>

ZooKeeper API Constructing Zookeeper Instances

We mainly use the Zookeeper class to access the zookeeper and perform a series of operations.

String hostport = "localhost:2181,localhost:2182,localhost:2183";
int sessiontimeout =;
String Path = "/test/app1";

ZooKeeper ZK = new ZooKeeper (Hostport, Sessiontimeout, New Watcher () {

            @Override public
            void Process ( Watchedevent event) {
                String path = Event.getpath ();
                System.out.println ("Watch:" +event.gettype () + ", Path:" +path);

            }
        });

New Znode Node

public void Create () {

        String data = "Hello world!";

        SYSTEM.OUT.PRINTLN ("Create Data:" +data);

        try {
            String result = zk.create (path, data.getbytes (), Ids.open_acl_unsafe, createmode.persistent);
            SYSTEM.OUT.PRINTLN (result);
        } catch (Keeperexception | Interruptedexception e) {
            e.printstacktrace ();
        }
    }

get znode node data

    public void Get () {

        String result = null;  
        try {  
            byte[] bytes = zk.getdata (path, NULL, NULL);  
            result = new String (bytes);  
       } catch (Exception e) {  
            e.printstacktrace ();
       }
       SYSTEM.OUT.PRINTLN ("Read data:" +result);
    }

set znode node data

public void Set () {

        String data = "Hello ricky!";

        SYSTEM.OUT.PRINTLN ("Set data:" +data);
        try {
            zk.setdata (path, data.getbytes (),-1);
        } catch (Keeperexception | Interruptedexception e) {
            e.printstacktrace ();
        }
    }

Delete Znode

public void Delete () {

        try {
            zk.delete (path,-1);
        } catch (Interruptedexception | Keeperexception e) {
            e.printstacktrace ();
        }
    }

Close ZooKeeper

public void Close () {

        try {
            zk.close ();
        } catch (Interruptedexception e) {
            e.printstacktrace ();
        }
    }

The complete code is as follows:

Package com.ricky.codelab.zookeeper;
Import java.io.IOException;
Import Org.apache.zookeeper.CreateMode;
Import org.apache.zookeeper.KeeperException;
Import org.apache.zookeeper.WatchedEvent;
Import Org.apache.zookeeper.Watcher;
Import Org.apache.zookeeper.ZooDefs.Ids;

Import Org.apache.zookeeper.ZooKeeper;
    public class Zkcruddemo {private String Hostport = "localhost:2181,localhost:2182,localhost:2183";
    private int sessiontimeout = 3000;

    Private String Path = "/test/app1";

    Private ZooKeeper ZK;
        public static void Main (string[] args) {try {new Zkcruddemo (). Test ();
        } catch (IOException e) {e.printstacktrace (); 

            }} public void Test () throws ioexception{ZK = new ZooKeeper (Hostport, Sessiontimeout, New Watcher () { @Override public void Process (Watchedevent event) {String path = Event.getpath (
                ); System.out.println ("Watch:" +event.gettype () + ", Path:" +path);

}
        });
Create ();
Get ();
        Set ();

        Get ();
        Delete ();

        Get ();
    Close ();

        } public void Create () {String data = "Hello world!";

        SYSTEM.OUT.PRINTLN ("Create Data:" +data);
            try {String result = zk.create (path, data.getbytes (), Ids.open_acl_unsafe, createmode.persistent);
        SYSTEM.OUT.PRINTLN (result); } catch (Keeperexception |
        Interruptedexception e) {e.printstacktrace ();  
        }} public void Get () {String result = null;  
            try {byte[] bytes = zk.getdata (path, NULL, NULL);  
       result = new String (bytes);
       } catch (Exception e) {e.printstacktrace ();
    } System.out.println ("Get Data:" +result);

        } public void Set () {String data = "Hello ricky!";
        SYSTEM.OUT.PRINTLN ("Set data:" +data);
           try { Zk.setdata (Path, data.getbytes (),-1); } catch (Keeperexception |
        Interruptedexception e) {e.printstacktrace ();
        }} public void Delete () {try {zk.delete (path,-1); } catch (Interruptedexception |
        Keeperexception e) {e.printstacktrace ();
        }} public void Close () {try {zk.close ();
        } catch (Interruptedexception e) {e.printstacktrace ();
 }
    }
}

Reference:
https://zookeeper.apache.org/doc/trunk/javaExample.html
http://zookeeper.apache.org/doc/ r3.4.8/api/org/apache/zookeeper/zookeeper.html