每日日报2021 10/26

zookeeper的Java使用：

 

添加pom文件

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>RELEASE</version>

</dependency>

<dependency>

<groupId>org.apache.logging.log4j</groupId>

<artifactId>log4j-core</artifactId>

<version>2.8.2</version>

</dependency>

<dependency>

<groupId>org.apache.zookeeper</groupId>

<artifactId>zookeeper</artifactId>

<version>3.5.7</version>

</dependency>

</dependencies>

private static String connectString =

"hadoop102:2181,hadoop103:2181,hadoop104:2181";

private static int sessionTimeout = 2000;

private ZooKeeper zkClient = null;

@Before

public void init() throws Exception {

zkClient = new ZooKeeper(connectString, sessionTimeout, new

Watcher() {

@Override

public void process(WatchedEvent watchedEvent) {

// 收到事件通知后的回调函数（用户的业务逻辑）

System.out.println(watchedEvent.getType() + "--"

+ watchedEvent.getPath());

// 再次启动监听

try {

List<String> children = zkClient.getChildren("/",

true);

for (String child : children) {

System.out.println(child);

}