Zookeeper API操作

pom引入：
 
        
            junit
            junit
            RELEASE
        
        
            org.apache.logging.log4j
            log4j-core
            2.8.2
        
        
            org.apache.zookeeper
            zookeeper
            3.5.7
        
    

src/main/resources新建log4j.properties：
log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d%p[%c]- %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d%p[%c]- %m%n

public class zkClient {

    private ZooKeeper zkClient = null;

    @Before
    public void init() throws Exception {
        zkClient = new ZooKeeper("192.168.196.129:2181", 30000, new Watcher() {
            @Override
            public void process(WatchedEvent watchedEvent) {
                //收到事件通知后的回调函数
                System.out.println(watchedEvent.getType() + "--" + watchedEvent.getPath());
                //再次启动监听
                try {
                    List children = zkClient.getChildren("/", true);
                    for (String child : children) {
                        System.out.println(child);
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    // 创建子节点
    @Test
    public void create() throws Exception {
        System.out.println("helo");
        // 参数 1：要创建的节点的路径； 参数 2：节点数据 ； 参数 3：节点权限 ；参数 4：节点的类型
        String nodeCreated = zkClient.create("/test", "hello world".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        System.out.println(nodeCreated);
    }

    // 获取子节点
    @Test
    public void getChildren() throws Exception {
        List children = zkClient.getChildren("/", true);
        for (String child : children) {
            System.out.println(child);
        }
    }

    // 判断znode是否存在
    @Test
    public void exist() throws Exception {
        Stat stat = zkClient.exists("/test", false);
        System.out.println(stat == null ? "not exist" : "exist");
    }

}