|NO.Z.00005|——————————|BigDataEnd|——|Hadoop&Zookeeper.V05|——|Zookeeper.v05|开源客户端监听器|获取节点数据.v01|

一、Zookeeper-开源客户端
### --- [zookeeper]

~~~     [Zookeeper开源客户端之监听节点变化]
~~~     [Zookeeper开源客户端之监听器]
~~~     [Zookeeper开源客户端之获取数据节点存在/更新/删除] 
### --- ZkClient

~~~     # ZkClient是Github上一个开源的zookeeper客户端在
~~~     Zookeeper原生API接口之上进行了包装是一个更易用的Zookeeper客户端，
~~~     同时zkClient在内部还实现了诸如Session超时重连、Watcher反复注册等功能
~~~     # 接下来，还是从创建会话、创建节点、读取数据、更新数据、
~~~     删除节点等方面来介绍如何使用zkClient这个zookeeper客户端
二、添加依赖：
### --- 在pom.xml文件中添加如下内容

    <dependencies>

        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.14</version>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.2</version>
        </dependency>
    </dependencies>
三、创建会话
### --- 创建会话
~~~     使用ZkClient可以轻松的创建会话，连接到服务端。

package com.yanqi.zk.demo;

import org.I0Itec.zkclient.ZkClient;

public class ZkDemo {
    public static void main(String[] args) {
        //先获取到zkclient对象,client与zk集群通信端口是2181
        final ZkClient zkClient = new ZkClient("linux121:2181"); //建立了到zk集群的会话
        System.out.println("zkclient is ready");
    }
}
### --- 编译打印
~~~     运行结果：ZooKeeper session created.结果表明已经成功创建会话。

D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=62322:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\zkclient_demo\target\classes;C:\Users\Administrator\.m2\repository\org\apache\zookeeper\zookeeper\3.4.14\zookeeper-3.4.14.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;C:\Users\Administrator\.m2\repository\com\github\spotbugs\spotbugs-annotations\3.1.9\spotbugs-annotations-3.1.9.jar;C:\Users\Administrator\.m2\repository\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;C:\Users\Administrator\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\Administrator\.m2\repository\jline\jline\0.9.94\jline-0.9.94.jar;C:\Users\Administrator\.m2\repository\org\apache\yetus\audience-annotations\0.5.0\audience-annotations-0.5.0.jar;C:\Users\Administrator\.m2\repository\io\netty\netty\3.10.6.Final\netty-3.10.6.Final.jar;C:\Users\Administrator\.m2\repository\com\101tec\zkclient\0.2\zkclient-0.2.jar com.yanqi.zk.demo.ZkDemo
zkclient is ready
### --- 创建节点
~~~     ZkClient提供了递归创建节点的接口，即其帮助开发者先完成父节点的创建，再创建子节点

package com.yanqi.zk.demo;

import org.I0Itec.zkclient.ZkClient;

public class ZkDemo {
    public static void main(String[] args) {
        //先获取到zkclient对象,client与zk集群通信端口是2181
        final ZkClient zkClient = new ZkClient("linux121:2181"); //建立了到zk集群的会话
        System.out.println("zkclient is ready");

        //1 创建节点
        zkClient.createPersistent("/yanqi-client/yanqi-c1", true); //如果需要级联创建，第二个参数设置为true
        System.out.println("path is created");
    }
}

### --- 编译打印

D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=58004:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\zkclient_demo\target\classes;C:\Users\Administrator\.m2\repository\org\apache\zookeeper\zookeeper\3.4.14\zookeeper-3.4.14.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;C:\Users\Administrator\.m2\repository\com\github\spotbugs\spotbugs-annotations\3.1.9\spotbugs-annotations-3.1.9.jar;C:\Users\Administrator\.m2\repository\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;C:\Users\Administrator\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\Administrator\.m2\repository\jline\jline\0.9.94\jline-0.9.94.jar;C:\Users\Administrator\.m2\repository\org\apache\yetus\audience-annotations\0.5.0\audience-annotations-0.5.0.jar;C:\Users\Administrator\.m2\repository\io\netty\netty\3.10.6.Final\netty-3.10.6.Final.jar;C:\Users\Administrator\.m2\repository\com\101tec\zkclient\0.2\zkclient-0.2.jar com.yanqi.zk.demo.ZkDemo
zkclient is ready
path is created
### --- 验证结果
~~~     运行结果：success create znode.    结果表明已经成功创建了节点，
~~~     值得注意的是，ZkClient通过设置createParents参数为true可以递归的先创建父节点，
~~~     再创建子节点

[zk: localhost:2181(CONNECTED) 1] ls /
[zk-test0000000000, yanqi-client, zookeeper]
### --- 删除节点
~~~     ZkClient提供了递归删除节点的接口，即其帮助开发者先删除所有子节点（存在），
~~~     再删除父节点。

package com.yanqi.zk.demo;

import org.I0Itec.zkclient.ZkClient;

public class ZkDemo {
    public static void main(String[] args) {
        //先获取到zkclient对象,client与zk集群通信端口是2181
        final ZkClient zkClient = new ZkClient("linux121:2181"); //建立了到zk集群的会话
        System.out.println("zkclient is ready");

        //1 创建节点
        zkClient.createPersistent("/yanqi-client/yanqi-c1", true); //如果需要级联创建，第二个参数设置为true
        System.out.println("path is created");

        //2删除节点
//      zkClient.delete("/yanqi-client");
        zkClient.deleteRecursive("/yanqi-client");//递归删除可以删除非空节点，先删除子节点然后删除父节点
        System.out.println("delete path is success");
    }
}
### --- 编译打印
~~~     运行结果: success delete znode结果表明ZkClient可直接删除带子节点的父节点，
~~~     因为其底层先删除其所有子节点，然后再删除父节点

D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=58464:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\zkclient_demo\target\classes;C:\Users\Administrator\.m2\repository\org\apache\zookeeper\zookeeper\3.4.14\zookeeper-3.4.14.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;C:\Users\Administrator\.m2\repository\com\github\spotbugs\spotbugs-annotations\3.1.9\spotbugs-annotations-3.1.9.jar;C:\Users\Administrator\.m2\repository\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;C:\Users\Administrator\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\Administrator\.m2\repository\jline\jline\0.9.94\jline-0.9.94.jar;C:\Users\Administrator\.m2\repository\org\apache\yetus\audience-annotations\0.5.0\audience-annotations-0.5.0.jar;C:\Users\Administrator\.m2\repository\io\netty\netty\3.10.6.Final\netty-3.10.6.Final.jar;C:\Users\Administrator\.m2\repository\com\101tec\zkclient\0.2\zkclient-0.2.jar com.yanqi.zk.demo.ZkDemo
zkclient is ready
path is created
delete path is success

Process finished with exit code 0
 
 
 
 
 
 
 
 
 
Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart
                                                                                                                                                   ——W.S.Landor
 

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