zookeeper curator客户端之增删改查
zookeeper安装：https://www.cnblogs.com/zwcry/p/10272506.html
curator客户端是Apache对zookeeper原生API的封装，在原生API的基础上又支持了每次的事件监听、重试机制、递归等操作。
客户端增删改查测试类：
package com.qy.learn.zk.curator; import org.apache.curator.RetryPolicy; import org.apache.curator.framework.CuratorFramework; import org.apache.curator.framework.CuratorFrameworkFactory; import org.apache.curator.retry.RetryNTimes; import org.apache.zookeeper.CreateMode; import org.apache.zookeeper.ZooDefs.Ids; import org.apache.zookeeper.data.Stat; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * @author 七脉 * 描述：zookeeper教程相关代码，并非封装，而是测试学习加注释说明，教你使用。实际工作中按照公司开发的代码规范走 * apache 的Curator是封装后的客户端，本人不建议自己封装， 可以使用Curator再次封装。 */ public class MyCuratorClient { private static final Logger log = LoggerFactory.getLogger(MyCuratorClient.class); //集群节点 public static final String zkServerClusterConnect = "192.168.159.129:2181,192.168.159.129:2182,192.168.159.129:2183"; //单一节点 public static final String zkServerSingleConnect = "192.168.159.129:2181"; public static void main(String[] args) throws Exception { CuratorFramework client = client(); log.info("客户端状态：{}", client.getState()); client.start(); log.info("客户端状态：{}", client.getState()); //创建节点 //create(client, "/father/me", "me"); //查询节点 //query(client, "/father/me"); //修改节点的值 //update(client, "/father/me", "newMe"); //删除节点 //delete(client, "/father/me"); client.close(); log.info("客户端状态：{}", client.getState()); } /** * @author 七脉 * 描述：获取CuratorFramework的客户端 * @return */ public static CuratorFramework client(){ log.info("准备创建CuratorFramework客户端"); int sessionTimeoutMs = 10000;//会话超时时间 int connectionTimeoutMs = 3000;//初次链接超时时间 int n = 3;//重试链接次数 int sleepMsBetweenRetries = 3000;//每次重试连接间隔毫秒数 //RetryPolicy重试显现策略有很多，具体可以查看RetryPolicy的每个实现类进行测试。 RetryPolicy retryPolicy = new RetryNTimes(n, sleepMsBetweenRetries); //CuratorFrameworkFactory.newClient是创建客户端的一种方法 //CuratorFramework curatorFramework = CuratorFrameworkFactory.newClient(zkServerClusterConnect, sessionTimeoutMs, connectionTimeoutMs, retryPolicy); //创建客户端方法还有 CuratorFrameworkFactory.builder().... CuratorFramework curatorFramework = CuratorFrameworkFactory.builder().connectString(zkServerClusterConnect).connectionTimeoutMs(connectionTimeoutMs).sessionTimeoutMs(sessionTimeoutMs).retryPolicy(retryPolicy).namespace("myspace").build(); log.info("完成创建CuratorFramework客户端"); return curatorFramework; } /** * @author 七脉 * 描述：递归创建节点数据 * @param client * @param path * @param data * @throws Exception */ public static void create(CuratorFramework client, String path, String data) throws Exception{ log.info("准备递归创建节点，path：{}，data：{}", path, data); client.create().creatingParentsIfNeeded()//如果path父节点不存在，一并创建 .withMode(CreateMode.PERSISTENT)//永久节点 .withACL(Ids.OPEN_ACL_UNSAFE)//所有可见权限 .forPath(path, data.getBytes());//设置节点数据 log.info("完成递归创建节点，path：{}，data：{}", path, data); } /** * @author 七脉 * 描述：查询节点值 * @param client * @param path * @return * @throws Exception */ public static String query(CuratorFramework client, String path) throws Exception{ log.info("准备查询节点：{} 值",path); String data = new String(client.getData().storingStatIn(getStat(client, path)).forPath(path)); log.info("完成查询节点：{}， 值：{}", path, data); return data; } /** * @author 七脉 * 描述：修改节点的值 * @param client * @param path * @param data * @return * @throws Exception */ public static Stat update(CuratorFramework client, String path, String data) throws Exception{ log.info("准备修改节点：{}，值：{}", path, data); Stat stat = client.setData().withVersion(getStat(client, path).getVersion()).forPath(path, data.getBytes()); log.info("完成修改节点：{}，值：{}", path, data); return stat; } /** * @author 七脉 * 描述：淡出节点 * @param client * @param path * @throws Exception */ public static void delete(CuratorFramework client, String path) throws Exception{ log.info("准备删除节点：{}",path); client.delete().guaranteed()//就算网络遇见抖动，只要连接成功，也会保证删除 .deletingChildrenIfNeeded()//递归删除子节点 .withVersion(getStat(client, path).getVersion()).forPath(path); log.info("完成删除节点：{}",path); } /** * @author 七脉 * 描述：查询节点元数据，查询、修改、删除时需要该数据的信息作为参数 * 同样也是判断节点是否存在的方法 * @param client * @param path * @return * @throws Exception */ public static Stat getStat(CuratorFramework client, String path) throws Exception{ log.info("准备获取 节点：{}的stat",path); Stat stat = client.checkExists().forPath(path); if(null==stat){ log.info("获取节点：{} 不存在或已删除",path); }else{ log.info("完成获取节点：{} stat信息, version：{}",path,stat.getVersion()); } return stat; } /** * @author 七脉 * 描述：测试客户端的三个状态 * client.isStarted();//官方已经建议使用该方法，后续升级可能不会对其维护，请不要再使用。 */ public static void status(){ CuratorFramework client = client(); //client.isStarted();//官方已经建议使用该方法，后续升级可能不会对其维护，请不要再使用。 log.info("客户端状态：{}", client.getState()); client.start(); log.info("客户端状态：{}", client.getState()); client.close(); log.info("客户端状态：{}", client.getState()); } }
pom配置文件：
<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> </parent> <groupId>com.qy.learn</groupId> <artifactId>qy-learn-zk-curator</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion> <maven.test.skip>true</maven.test.skip> <java.version>1.8</java.version> <spring.boot.version>2.0.1.RELEASE</spring.boot.version> <qy.code.version>0.0.1-SNAPSHOT</qy.code.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> <!-- 不使用springboot默认log --> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j2</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper --> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.12</version> <!-- 排除冲突jar --> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework --> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-framework</artifactId> <version>4.1.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes --> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-recipes</artifactId> <version>4.1.0</version> </dependency> </dependencies> <repositories> <repository> <id>nexus-aliyun</id> <name>Nexus aliyun</name> <url>http://maven.aliyun.com/nexus/content/groups/public</url> <releases> <enabled>true</enabled> </releases> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <pluginRepositories> <pluginRepository> <id>nexus-aliyun</id> <name>Nexus aliyun</name> <url>http://maven.aliyun.com/nexus/content/groups/public</url> <releases> <enabled>true</enabled> </releases> <snapshots> <enabled>false</enabled> </snapshots> </pluginRepository> </pluginRepositories> <build> <plugins> <!-- 要将源码放上去，需要加入这个插件 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-source-plugin</artifactId> <configuration> <attach>true</attach> </configuration> <executions> <execution> <phase>compile</phase> <goals> <goal>jar</goal> </goals> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>