docker安装Zookeeper，以及Zookeeper工具类编写和分布式锁的测试

一、docker安装zookeeper

1.拉取镜像。默认是最新版本

docker pull zookeeper 

2.运行docker镜像

docker run --privileged=true -d --name zookeeper --publish 2181:2181  -d zookeeper:latest

3.查看容器

docker ps 

4.（1）idea zookeeper 查看工具

（2）zkclient

二.Zookeeper工具类编写（引用curator连接方式）

curator的详解，请参考：https://www.jianshu.com/p/70151fc0ef5d
1.工具类

package com.utils;


import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.ACLBackgroundPathAndBytesable;
import org.apache.curator.framework.api.BackgroundPathAndBytesable;
import org.apache.curator.framework.api.BackgroundPathable;
import org.apache.curator.framework.imps.CuratorFrameworkState;
import org.apache.curator.framework.recipes.locks.InterProcessLock;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.retry.RetryNTimes;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Stat;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.concurrent.TimeUnit;


/**
 * Date: 2018年11月6日
 *
 * @author lk
 */
public class ZkClient {

    private String zkAddr;
    private int timeOut;
    private String authSchema;
    private String authInfo;
    private CuratorFramework client;



    public ZkClient(String zkAddr, int timeOut, String namespace) throws Exception{

        this(zkAddr,timeOut,namespace,null);

    }

    /**
     * 获取zk 连接客户端
     * @param zkAddr zk地址 ip:port,ip:port,ip:port
     * @param timeOut 连接超时ms
     * @param namespace 所有的操作都是在 /namespace 下的节点操作
     * @param acl  Access Control List（访问控制列表）。Znode被创建时带有一个ACL列表

     * acl 主要由三个维度：schema,id,permision 控制节点权限 

     * eg:

     * Id id = new Id("digest", DigestAuthenticationProvider.generateDigest("username:password"));

     * ACL acl = new ACL(ZooDefs.Perms.ALL, id); 

     * 

     * 维度 schema: 

     * 1：digest 用户名+密码验证 它对应的维度id=username:BASE64(SHA1(password))

     * 2：host 客户端主机名hostname验证 

     * 3：ip 它对应的维度id=客户机的IP地址，设置的时候可以设置一个ip段，比如ip:192.168.1.0/16, 表示匹配前16个bit的IP段

     * 4：auth 使用sessionID验证 

     * 5：world 无验证，默认是无任何权限  它下面只有一个id, 叫anyone  

     * 6：super: 在这种scheme情况下，对应的id拥有超级权限，可以做任何事情(cdrwa)  

     * 7：sasl: sasl的对应的id，是一个通过了kerberos认证的用户id  

     * 

     * 维度：permision 

     * ZooDefs.Perms.READ 读权限

     * ZooDefs.Perms.WRITE 写权限

     * ZooDefs.Perms.CREATE 创建节点权限

     * ZooDefs.Perms.DELETE 删除节点权限

     * ZooDefs.Perms.ADMIN 能设置权限

     * ZooDefs.Perms.ALL 所有权限

     * ALL = READ | WRITE | CREATE | DELETE | ADMIN

     * @throws Exception
     */

    public ZkClient(String zkAddr, int timeOut, String namespace,ACL acl) throws Exception{
        this.zkAddr = zkAddr;
        if (timeOut > 0) {
            this.timeOut = timeOut;
        }
        if (null != acl) {
            this.authSchema = acl.getId().getScheme();
            this.authInfo = acl.getId().getId();
        }
        CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory
                .builder().connectString(this.zkAddr).namespace(StringUtils.isEmpty(namespace)?"":namespace)
                .connectionTimeoutMs(this.timeOut)
                .retryPolicy(new RetryNTimes(5, 10));
        if ((!StringUtils.isEmpty(this.authSchema))
                && (!StringUtils.isEmpty(this.authInfo))) {
            builder.authorization(this.authSchema, this.authInfo.getBytes());
        }
        this.client = builder.build();
        this.client.start();
        this.client.blockUntilConnected(5, TimeUnit.SECONDS);

    }



    /**
     * 创建一个所有权限节点即schema:world;id:annyone;permision:ZooDefs.Perms.ALL
     * @param nodePath 创建的结点路径
     * @param data 节点数据
     * @param createMode 节点模式
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * @throws Exception
     */
    public void createNode(String nodePath, String data, CreateMode createMode,boolean recursion)
            throws Exception {

        createNode(nodePath, ZooDefs.Ids.OPEN_ACL_UNSAFE, data, createMode,recursion);
    }


    /**
     * 创建节点
     * @param nodePath 创建节点的路径
     * @param acls 节点控制权限列表
     * @param data 节点存放的数据
     * @param createMode 创建节点的模式
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * 节点模式CreateMode

     * 1：CreateMode.EPHEMERAL 创建临时节点；该节点在客户端掉线的时候被删除

     * 2：CreateMode.EPHEMERAL_SEQUENTIAL  临时自动编号节点，一旦创建这个节点的客户端与服务器端口也就是session 超时，这种节点会被自动删除，并且根据当前已近存在的节点数自动加 1，然后返回给客户端已经成功创建的目录节点(可做分布式锁)

     * 3：CreateMode.PERSISTENT 持久化目录节点，存储的数据不会丢失。

     * 4：CreateMode.PERSISTENT_SEQUENTIAL  顺序自动编号的持久化目录节点，存储的数据不会丢失，并且根据当前已近存在的节点数自动加 1，然后返回给客户端已经成功创建的目录节点名

     * @throws Exception
     */
    public void createNode(String nodePath, List acls, String data,
                           CreateMode createMode,boolean recursion) throws Exception {
        byte[] bytes = null;
        if (!StringUtils.isEmpty(data)) {
            bytes = data.getBytes("UTF-8");
        }
        createNode(nodePath, acls, bytes, createMode,recursion);
    }

    /**
     * @param nodePath 创建节点的路径
     * @param acls 节点控制权限列表
     * @param data 节点存放的数据
     * @param createMode 创建节点的模式
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * 节点模式CreateMode

     * 1：CreateMode.EPHEMERAL 创建临时节点；该节点在客户端掉线的时候被删除

     * 2：CreateMode.EPHEMERAL_SEQUENTIAL  临时自动编号节点，一旦创建这个节点的客户端与服务器端口也就是session 超时，这种节点会被自动删除，并且根据当前已近存在的节点数自动加 1，然后返回给客户端已经成功创建的目录节点(可做分布式锁)

     * 3：CreateMode.PERSISTENT 持久化目录节点，存储的数据不会丢失。

     * 4：CreateMode.PERSISTENT_SEQUENTIAL  顺序自动编号的持久化目录节点，存储的数据不会丢失，并且根据当前已近存在的节点数自动加 1，然后返回给客户端已经成功创建的目录节点名

     * @throws Exception
     */
    public void createNode(String nodePath, List acls, byte[] data,
                           CreateMode createMode,boolean recursion) throws Exception {
        if(recursion){
            ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client
                    .create().creatingParentsIfNeeded().withMode(createMode))
                    .withACL(acls)).forPath(nodePath, data);
        }
        else{
            ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client
                    .create().withMode(createMode))
                    .withACL(acls)).forPath(nodePath, data);
        }
    }

    /**
     * 创建一个所有权限的永久节点
     * @param nodePath
     * @param data
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * @throws Exception
     */
    public void createPersitentNode(String nodePath, String data,boolean recursion) throws Exception {

        createNode(nodePath, data, CreateMode.PERSISTENT,recursion);
    }

    /**
     * 创建一个所有权限的零时节点
     * @param nodePath
     * @param data
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * @throws Exception
     */
    public void createEphemeralNode(String nodePath, String data,boolean recursion) throws Exception {

        createNode(nodePath, data, CreateMode.EPHEMERAL,recursion);
    }

    /**
     * 创建一个带权限的永久节点
     * @param nodePath
     * @param data
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * @throws Exception
     */
    public void createPersitentNodeWithAcl(String nodePath, String data,List acls,boolean recursion) throws Exception {

        createNode(nodePath, acls, data, CreateMode.PERSISTENT,recursion);
    }

    /**
     * 创建一个带权限的零时节点
     * @param nodePath
     * @param data
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * @throws Exception
     */
    public void createEphemeralNodeAcl(String nodePath, String data,List acls,boolean recursion) throws Exception {

        createNode(nodePath, acls, data, CreateMode.EPHEMERAL,recursion);
    }




    /**
     * 创建序列节点且当父节点不存在时创建父节点
     * @param nodePath
     * @param acls 可参考：ZooDefs.Ids
     * @param createMode
     * @param recursion 当父目录不存在是否创建 true:创建，fasle:不创建
     * @throws Exception
     */
    public void createSeqNode(String nodePath,List acls,CreateMode createMode,boolean recursion) throws Exception {
        if(recursion){
            ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client
                    .create().creatingParentsIfNeeded()
                    .withMode(createMode))
                    .withACL(acls)).forPath(nodePath);
        }
        else{
            ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client
                    .create()
                    .withMode(createMode))
                    .withACL(acls)).forPath(nodePath);
        }
    }

    /**
     * 存在返回 节点stat 信息；否则返回null
     * @param path
     * @return
     * @throws Exception
     */
    public Stat exists(String path) throws Exception {

        return  this.client.checkExists().forPath(path);
    }

    /**
     * 判断节点是否存在，存在则注册节点监视器
     * @param path
     * @param watcher
     * @return
     */
    public boolean exists(String path, Watcher watcher) throws Exception {

        if (null != watcher) {
            return null != ((BackgroundPathable) this.client.checkExists().usingWatcher(watcher)).forPath(path);
        }
        return null != this.client.checkExists().forPath(path);
    }

    /**
     * 判断是否处于连接状态
     * @return
     */
    public boolean isConnected() {

        if ((null == this.client)
                || (!CuratorFrameworkState.STARTED.equals(this.client
                .getState()))) {
            return false;
        }
        return true;
    }

    public void retryConnection() {
        this.client.start();
    }

    /**
     * 获取连接客户端
     * @return
     */
    public CuratorFramework getInnerClient(){

        return this.client;

    }

    /**
     * 关闭连接
     */
    public void quit() {

        if ((null != this.client)
                && (CuratorFrameworkState.STARTED
                .equals(this.client.getState()))) {
            this.client.close();
        }
    }


    /**
     * 删除节点
     * @param path
     * @param deleChildren
     * @throws Exception

     */
    public void deleteNode(String path,boolean deleChildren) throws Exception {

        if(deleChildren){
            this.client.delete().guaranteed().deletingChildrenIfNeeded()
                    .forPath(path);
        }
        else{
            this.client.delete().forPath(path);
        }
    }

    /**
     * 设置节点数据
     * @param nodePath
     * @param data
     * @throws Exception
     */
    public void setNodeData(String nodePath, String data) throws Exception {

        byte[] bytes = null;
        if (!StringUtils.isEmpty(data)) {
            bytes = data.getBytes("UTF-8");
        }
        setNodeData(nodePath, bytes);
    }

    /**
     * 设置节点数据
     * @param nodePath
     * @param data
     * @throws Exception
     */
    public void setNodeData(String nodePath, byte[] data) throws Exception {
        this.client.setData().forPath(nodePath, data);
    }

    public String getNodeData(String nodePath, boolean watch) throws Exception {
        byte[] data;
        if (watch) {
            data = (byte[]) ((BackgroundPathable) this.client.getData()
                    .watched()).forPath(nodePath);
        } else {
            data = (byte[]) this.client.getData().forPath(nodePath);
        }
        if ((null == data) || (data.length <= 0)) {
            return null;
        }
        return new String(data, "UTF-8");
    }

    public String getNodeData(String nodePath) throws Exception {
        return getNodeData(nodePath, false);
    }

    public String getNodeData(String nodePath, Watcher watcher)
            throws Exception {
        byte[] data = getNodeBytes(nodePath, watcher);
        return new String(data, "UTF-8");
    }

    public byte[] getNodeBytes(String nodePath, Watcher watcher)
            throws Exception {
        byte[] bytes = null;
        if (null != watcher) {
            bytes = (byte[]) ((BackgroundPathable) this.client.getData()
                    .usingWatcher(watcher)).forPath(nodePath);
        } else {
            bytes = (byte[]) this.client.getData().forPath(nodePath);
        }
        return bytes;
    }

    public byte[] getNodeBytes(String nodePath) throws Exception {
        return getNodeBytes(nodePath, null);
    }


    @SuppressWarnings("unchecked")
    public List getChildren(String nodePath, Watcher watcher)
            throws Exception {
        return (List) ((BackgroundPathable) this.client
                .getChildren().usingWatcher(watcher)).forPath(nodePath);
    }

    public List getChildren(String path) throws Exception {
        return (List) this.client.getChildren().forPath(path);
    }

    @SuppressWarnings("unchecked")
    public List getChildren(String path, boolean watcher)
            throws Exception {
        if (watcher) {
            return (List) ((BackgroundPathable) this.client
                    .getChildren().watched()).forPath(path);
        }
        return (List) this.client.getChildren().forPath(path);
    }


    public ZkClient addAuth(String authSchema, String authInfo)
            throws Exception {
        synchronized (ZkClient.class) {
            this.client.getZookeeperClient().getZooKeeper()
                    .addAuthInfo(authSchema, authInfo.getBytes());
        }
        return this;
    }

    /**
     * 分布式锁
     * @param lockPath
     * @return
     */
    public InterProcessLock getInterProcessLock(String lockPath) {
        return new InterProcessMutex(this.client, lockPath);
    }

}
    /***
     * 监听节点变化
     */
    public PathChildrenCache watchNode(String path,PathChildrenCacheListener listener) throws Exception {
        //创建监听
        PathChildrenCache pathChildrenCache=new PathChildrenCache(this.client,path,true);
        pathChildrenCache.getListenable().addListener(listener);
        pathChildrenCache.start();
        return pathChildrenCache;
    }

2.pom文件

  4.0.0
  mavenzookeeper
  mavenzookeeper
  0.0.1-SNAPSHOT
  mavenzookeeper
  jar

  
  
    org.springframework.boot
    spring-boot-starter-parent
    1.1.3.RELEASE
    
  

  
  
    
      org.springframework.boot
      spring-boot-starter-web
    

    
    
      org.springframework.boot
      spring-boot-starter-data-jpa
    

    
    
      mysql
      mysql-connector-java
    

    
    
      org.springframework.boot
      spring-boot-starter-thymeleaf
    
    
    
      org.apache.zookeeper
      zookeeper
      3.4.6
      pom
    
    
      org.apache.curator
      curator-recipes
      2.12.0
    
      
          org.apache.curator
          curator-framework
          2.12.0
      



  

  
  
    
      
        org.springframework.boot
        spring-boot-maven-plugin
      
    

    
    
      
        
          maven-compiler-plugin
          
            1.8
            1.8
          
        
      
    
  

3.监听最后调用和分布式锁测试

package com.controller;

import com.utils.ZkClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/zkController")
public class getZK {
    @Autowired
    private ZkClientService zkClient;
    @RequestMapping("/getZK")
    @ResponseBody
    public String getZK(){
        try {
            List children = zkClient.getChildren("/");
            System.out.println(children.stream().toString());
             //分布式锁测试
            for(int i=0;i<50;i++){
                new Thread(()->{
                    InterProcessLock lock = null;
                    try{
                        lock = zkClient.getInterProcessLock("/distributeLock");
                        System.out.println(Thread.currentThread().getName()+"申请锁");
                        lock.acquire();
                        System.out.println(Thread.currentThread().getName()+"持有锁");
                        Thread.sleep(500);
                    }
                    catch(Exception e){
                        e.printStackTrace();
                    }
                    finally{
                        if(null != lock){
                            try {
                                lock.release();
                                System.out.println(Thread.currentThread().getName()+"释放有锁");
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }).start();
            }
            zkClient.watchNode("/",(client,event)->{//对节点进行监听
                String data=new String(event.getData().getData());
                switch (event.getType()){
                    case CHILD_ADDED: {
                        System.out.println("Node added: " + data);
                        break;
                    }
                    case CHILD_UPDATED: {
                        System.out.println("Node changed: " + data);
                        break;
                    }
                    case CHILD_REMOVED: {
                        System.out.println("Node removed: " + data);
                        break;
                    }

                }
            });
            return "ok";
        }catch (Exception e){
            e.printStackTrace();
            return "error";
        }

    }
}