Zookeeper:JavaApi创建节点

一.pom文件和log4j.properties

<?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>

# 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

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

//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

        //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:

        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：

        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：

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

　

 digest授权：

        //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

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

CreateMode枚举类介绍：

 异步方式创建节点:

        //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...");