Zookeeper:JavaApi创建节点

一.pom文件和log4j.properties

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<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">     <modelVersion>4.0.0</modelVersion>       <groupId>com.wj</groupId>     <artifactId>zookeeperApi</artifactId>     <version>1.0-SNAPSHOT</version>       <dependencies>         <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->         <dependency>             <groupId>org.apache.zookeeper</groupId>             <artifactId>zookeeper</artifactId>             <version>3.4.10</version>         </dependency>         <!-- https://mvnrepository.com/artifact/log4j/log4j -->         <dependency>             <groupId>log4j</groupId>             <artifactId>log4j</artifactId>             <version>1.2.16</version>         </dependency>         <!-- https://mvnrepository.com/artifact/jline/jline -->         <dependency>             <groupId>jline</groupId>             <artifactId>jline</artifactId>             <version>0.9.94</version>         </dependency>         <!-- https://mvnrepository.com/artifact/junit/junit -->         <dependency>             <groupId>junit</groupId>             <artifactId>junit</artifactId>             <version>4.7</version>         </dependency>         <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->         <dependency>             <groupId>org.slf4j</groupId>             <artifactId>slf4j-api</artifactId>             <version>1.6.1</version>         </dependency>         <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->         <dependency>             <groupId>org.slf4j</groupId>             <artifactId>slf4j-log4j12</artifactId>             <version>1.6.1</version>         </dependency>           <dependency>             <groupId>org.slf4j</groupId>             <artifactId>slf4j-nop</artifactId>             <version>1.6.1</version>         </dependency>       </dependencies>   </project>

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# Define some default values that can be overridden by system properties log4j.rootLogger=INFO, CONSOLE   log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.Threshold=INFO log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} [myid:%X{myid}] - %-5p - %m%n

二.Java连接Zookeeper

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public static void main(String[] args) throws Exception {     //计数器对象     final CountDownLatch latch = new CountDownLatch(1);     //     * @param sessionTimeout     //     *            session timeout in milliseconds     //     * @param watcher     //     *            a watcher object which will be notified of state changes, may     //     *            also be notified for node events     ZooKeeper zooKeeper = new ZooKeeper("192.168.10.132:2181", 500, new Watcher() {         public void process(WatchedEvent event) {             if(event.getState() ==Watcher.Event.KeeperState.SyncConnected){                 System.out.println("连接创建成功");                 latch.countDown();             }         }     });     //主线程阻塞等待连接对象的创建成功     latch.await();     System.out.println("----"+zooKeeper.getSessionId()+"----");     zooKeeper.close(); }

　控制台打印情况：

 三.创建节点

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//同步方式 create(final String path, byte data[], List<ACL> acl,CreateMode createMode) //异步方式 create(final String path, byte data[], List<ACL> acl,CreateMode createMode,  StringCallback cb, Object ctx)

参数说明：

path：-znode路径

data：节点数据内容

acl：访问控制列表

createMode：节点的类型，枚举类

cb：异步回调接口

ctx：传递上下文参数

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//节点路径  /create //节点数据  create //权限列表： world:anyone:adrwa //节点类型：持久化节点 zooKeeper.create("/create","create".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

world授权:

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List<ACL> acls = new ArrayList<ACL>(); Id id = new Id("world", "anyone"); acls.add(new ACL(ZooDefs.Perms.READ,id)); acls.add(new ACL(ZooDefs.Perms.WRITE,id)); zooKeeper.create("/create/node2","node2".getBytes(), acls, CreateMode.PERSISTENT);

ip授权：

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List<ACL> acls = new ArrayList<ACL>(); Id id = new Id("ip", "192.168.10.132"); acls.add(new ACL(ZooDefs.Perms.ALL,id)); zooKeeper.create("/create/node3","node3".getBytes(), acls, CreateMode.PERSISTENT);

auth授权：

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//添加授权用户 zooKeeper.addAuthInfo("digest","admin:admin".getBytes());<br>　　　　　//给予所有权限 zooKeeper.create("/create/node4","node4".getBytes(), ZooDefs.Ids.CREATOR_ALL_ACL, CreateMode.PERSISTENT);

　

 digest授权：

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//授权模式和授权对象 Id id = new Id("digest", "wj:64ibjjwm94195LPhuzhUdkIjOl0="); //所有权限 acls.add(new ACL(ZooDefs.Perms.ALL,id)); zooKeeper.create("/create/node5","node5".getBytes(), acls, CreateMode.PERSISTENT);

 创建持久化有序节点：

输出结果为节点路径

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1	String s = zooKeeper.create("/create/node6","node6".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);<br>System.out.println(s);

CreateMode枚举类介绍：

 异步方式创建节点:

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//异步方式创建节点 zooKeeper.create("/create/node6", "node6".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT, new AsyncCallback.StringCallback() {     public void processResult(int rc, String path, Object ctx, String name) {         System.out.println(rc+"=="+path+"=="+ctx+"=="+name);     } },"context...."); Thread.sleep(5000); System.out.println("end...");