zookeeper客户端

启动单机版的zookeeper
配置Maven环境
(1) IDEA自带maven
(2) 更新Maven库镜像地址：
① 拷贝D:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\plugins\maven\lib\maven3\conf\settings.xml [IntelliJ的安装目录]到 C:/用户/username/.m2 (如果.m2文件不存在，可以新建一个.m2文件夹）；
② 修改.m2文件夹下的settings.xml，在和之间添加：
（为了可以从国内的aliyun镜像站下载依赖，国外的依赖下载慢）

 <mirror><id>aliyun</id><mirrorOf>central</mirrorOf><name>Human Readable Name for this Mirror.</name><url>http://maven.aliyun.com/nexus/content/groups/public/</url></mirror>

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（3）可以修改.m2文件夹的位置：https://blog.csdn.net/qq_27093465/article/details/52957253，此处我没有修改

新建Maven项目，选好JDK，不要选"Create from archetype"，设置完之后next,最后finish
1. 打开新建的项目之后，右下加会出现，import changes即可
2. 打开后的pom.xml文件
  
  6. 添加依赖，添加的依赖放在<dependencies></dependencies>之间，每个依赖用<dependency></dependency>括起来
  
  7. zookeeper版本位置发红，可以去aliyun查看一下zookeeper的版本，选择GAV搜索
```
  ![在这里插入图片描述](https://img-blog.csdnimg.cn/20200329224353179.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)
```
  1. 根据搜索结果修改zookeeper的版本，然后更新，稍等片刻
  10. 继续完善pom.xml文件，添加org.apache.zookeeper依赖，可以从maven仓库找,其实不需要上面的org.apache.hadoop也可以，后来来我把它删了，一下是完整代码

     <?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.example.zk1</groupId><artifactId>zookeeper1</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>3.4.14</version><type>pom</type></dependency><!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.12.1</version></dependency><!-- https://mvnrepository.com/artifact/junit/junit --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>org.apache.hadoop</groupId><artifactId>zookeeper</artifactId><version>3.3.1</version></dependency></dependencies></project>

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①从maven仓库中查找zookeeper,选择自己的zookeeper版本，复制下面的代码

	![在这里插入图片描述](https://img-blog.csdnimg.cn/20200329223908666.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)![在这里插入图片描述](https://img-blog.csdnimg.cn/20200329222851853.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)②Loj4j的依赖，日志用，也是在Mave仓库找apache Log4j Core,选择一个版本复制依赖到dependencies节点在resources目录下新建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

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这部分是为了下图

 ③ 还有一个做测试用的[Junit](https://mvnrepository.com/artifact/junit/junit)11.  重新install，有时有些依赖没有下载下来但并不影响使用![在这里插入图片描述](https://img-blog.csdnimg.cn/20200330103232585.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)  13.  接下来写代码，新建package，新建java类![在这里插入图片描述](https://img-blog.csdnimg.cn/20200329222939838.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)![在这里插入图片描述](https://img-blog.csdnimg.cn/20200329222945531.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)13. 查看Centos7的ip地址,使用ifconfig命令，查看ens33的ip![在这里插入图片描述](https://img-blog.csdnimg.cn/20200329222956252.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5ODU5MA==,size_16,color_FFFFFF,t_70)14. 写代码```javapackage demo.zookeeper;import org.apache.zookeeper.*;import org.apache.zookeeper.ZooDefs.Ids;import java.io.IOException;public class ZKBasicOperation {public static void main(String[] args) throws IOException, KeeperException, InterruptedException {// 创建一个与服务器的连接ZooKeeper zk = new ZooKeeper("192.168.79.128:2181", 60000, new Watcher() {// 监控所有被触发的事件public void process(WatchedEvent event) {System.out.println("EVENT:" + event.getType());}});// 查看根节点System.out.println("ls / => " + zk.getChildren("/", true));// 创建一个目录节点if (zk.exists("/node", true) == null) {zk.create("/node", "conan".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);System.out.println("create /node conan");// 查看/node节点数据System.out.println("get /node => " + new String(zk.getData("/node", false, null)));// 查看根节点System.out.println("ls / => " + zk.getChildren("/", true));}// 创建一个子目录节点if (zk.exists("/node/sub1", true) == null) {zk.create("/node/sub1", "sub1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);System.out.println("create /node/sub1 sub1");// 查看node节点System.out.println("ls /node => " + zk.getChildren("/node", true));}// 修改节点数据if (zk.exists("/node", true) != null) {zk.setData("/node", "changed".getBytes(), -1);// 查看/node节点数据System.out.println("get /node => " + new String(zk.getData("/node", false, null)));}// 删除节点if (zk.exists("/node/sub1", true) != null) {zk.delete("/node/sub1", -1);zk.delete("/node", -1);// 查看根节点System.out.println("ls / => " + zk.getChildren("/", true));}// 关闭连接zk.close();}}```运行结果（要等一会，一开始会有一些Warning）[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-RNQxT7Yf-1585491574683)(img/image-20200329214716360.png)]

接
zk.close();
}
}