Zookeeper（三）-- JAVA原生API
一、前提
jar包：zookeeper-3.4.9.jar，slf4j-api-1.6.1.jar，slf4j-log4j12-1.6.1.jar，log4j-1.2.15.jar
二、Demo
package com.xbq.zookeeper; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; import java.util.List; import org.apache.zookeeper.CreateMode; import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.WatchedEvent; import org.apache.zookeeper.Watcher; import org.apache.zookeeper.ZooDefs; import org.apache.zookeeper.ZooDefs.Ids; import org.apache.zookeeper.ZooKeeper; import org.apache.zookeeper.data.ACL; import org.apache.zookeeper.data.Id; import org.apache.zookeeper.server.auth.DigestAuthenticationProvider; /** * @ClassName: ZookeeperDemo * @Description: TODO zookeeper测试 * @author xbq * @version 1.0 * @date 2017-3-10 下午5:05:16 */ public class ZookeeperDemo { private static final int SESSION_TIMEOUT = 3000; public static void main(String[] args) {
Zookeeper zooKeeper = null; try { zooKeeper = new ZooKeeper("192.168.242.128:2183", SESSION_TIMEOUT, new Watcher() { @Override public void process(WatchedEvent event) { System.out.println("触发事件：" + event.getType()); } }); String path = "/node_xbq"; String data = "TestxbqCoder"; create(zooKeeper, path, data); // update(zooKeeper, path, data); // delete(zooKeeper, path); // aclOper(zooKeeper, path, data); // aclOper2(zooKeeper, path, data); // doWatch(zooKeeper, path, data); } catch (Exception e) { e.printStackTrace(); } finally {
if(zooKeeper ! = null){
try{
zooKeeper.close();
}catch(Exception e){
}
}
} } /** * @Title: create * @Description: TODO 增加操作 * @param zooKeeper * @param path * @param data * @throws KeeperException * @throws InterruptedException * @return: void */ public static void create(ZooKeeper zooKeeper, String path, String data) throws KeeperException, InterruptedException{ if(zooKeeper.exists(path, false) == null){ // 如果不存在节点，就新建 // 第三个参数是 权限，第四个参数 代表持久节点
// 权限分类：OPEN_ACL_UNSAFE：对所有用户开放 READ_ACL_UNSAFE：只读 CREATOR_ALL_ACL： 创建者可以做任何操作 zooKeeper.create(path, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } System.out.println(new String(zooKeeper.getData(path, true, null))); } /** * @Title: update * @Description: TODO 修改操作 * @param zooKeeper * @return: void * @throws InterruptedException * @throws KeeperException */ public static void update(ZooKeeper zooKeeper, String path, String data) throws KeeperException, InterruptedException { zooKeeper.setData(path, data.getBytes(), -1); // -1标识任何版本号 都可以 System.out.println(new String(zooKeeper.getData(path, true, null))); } /** * @Title: delete * @Description: TODO 删除 * @param zooKeeper * @param path * @throws KeeperException * @throws InterruptedException * @return: void */ public static void delete(ZooKeeper zooKeeper, String path) throws KeeperException, InterruptedException{ if(zooKeeper.exists(path, false) != null){ zooKeeper.delete(path, -1); } if(zooKeeper.exists(path, false) != null){ System.out.println(new String(zooKeeper.getData(path, true, null))); } } /** * @Title: aclOper * @Description: TODO 权限测试 先创建一个只读权限节点，然后更新该节点 * @param zooKeeper * @param path * @param data * @throws KeeperException * @throws InterruptedException * @return: void */ public static void aclOper(ZooKeeper zooKeeper, String path, String data) throws KeeperException, InterruptedException{ // 首先创建一个只读的节点。第三个参数 代表只读权限 zooKeeper.create(path, data.getBytes(), Ids.READ_ACL_UNSAFE, CreateMode.PERSISTENT); System.out.println(new String(zooKeeper.getData(path, true, null))); // 测试更新节点，因为增加的是 只读的，所以 应该是不可以修改的。发现报错：org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode = NoAuth for /node_xbq zooKeeper.setData(path, "testRead_ACL".getBytes(), -1); } /** * @Title: aclOper2 * @Description: TODO 自定义权限验证
* 自定义schema权限类型:digest,world,auth,ip，这里用 digest举例 * @param zooKeeper * @param path * @param data * @throws KeeperException * @throws InterruptedException * @throws NoSuchAlgorithmException * @return: void */ public static void aclOper2(ZooKeeper zooKeeper, String path, String data) throws KeeperException, InterruptedException, NoSuchAlgorithmException{ // 第一个参数是 所有的权限，第二个参数是 通过 用户名和密码 验证 ACL acl = new ACL(ZooDefs.Perms.ALL, new Id("digest", DigestAuthenticationProvider.generateDigest("root:root"))); List<ACL> acls = new ArrayList<ACL>(); acls.add(acl); if(zooKeeper.exists(path, false) == null){ zooKeeper.create(path, data.getBytes(), acls, CreateMode.PERSISTENT); } zooKeeper.addAuthInfo("digest", "root:root".getBytes()); // 通过下面的方式 是可以取到值的，因为 加了 用户名和 密码 验证 ，需要 加上 zooKeeper.addAuthInfo("digest", "root:root".getBytes()); System.out.println(new String(zooKeeper.getData(path, true, null))); } /** * @Title: doWatch * @Description: TODO 监听 * @param zooKeeper * @param path * @param data * @throws KeeperException * @throws InterruptedException * @return: void */ public static void doWatch(ZooKeeper zooKeeper, String path, String data) throws KeeperException, InterruptedException{ if(zooKeeper.exists(path, false) == null){ zooKeeper.create(path, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } // 监听 path节点 zooKeeper.getData(path, new Watcher() { @Override public void process(WatchedEvent event) { System.out.println("触发了节点变更事件：" + event.getType()); } }, null); // 用更新操作触发 监听事件 zooKeeper.setData(path, "updateTest".getBytes(), -1); } }
三、源码下载
http://git.oschina.net/xbq168/Zookeeper-Demo
