spring整合各种服务注册中心(zk、eureka、nacos、consul)
注：本文篇幅有点长，所以建议各位下载源码学习。（如需要请收藏！转载请声明来源，谢谢！）
代码下载：https://gitee.com/hong99/spring/issues/I1N1DF
什么服务注册中心？
引用：https://www.cnblogs.com/dalianpai/p/12255458.html
个人理解：注册中心就类似手机公共的通讯录。两部手机，有的用移动卡，有的用联通卡，大家只要注册上去后都可以被其他人查到，然后可以进行互拨。当要拨打的时候从注册中心上面查看到某个人的具体号码(ip地址),然后进行拨打。
服务注册中心的作用？
服务注册中心有哪些功能？
什么是CAP？
请参照：什么是CAP理论？
服务注册中心有哪些？
代码下载：https://gitee.com/hong99/spring/issues/I1N1DF
代码实现
Zookeeper相关实现
zk相关配置
下载地址：https://zookeeper.apache.org/
配置也可以参照：https://zookeeper.apache.org/doc/current/zookeeperStarted.html
下载后->解压->进入conf->复制一份zoo_sample.cfg 并且改名为zoo.cfg
编辑zoo.cfg 修改如下，注意这里的路劲是你自的路劲
dataDir=D:\\tools\\apache-zookeeper-3.6.2-bin\\data
dataLogDir=D:\\tools\\apache-zookeeper-3.6.2-bin\\log
保存后运行zkServer.cmd
配置完毕~
java实现zk连接
引入zk包
<dependencies>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.5.4-beta</version>
</dependency>
</dependencies>/**
* @author: csh
* @Date: 2020/12/11 12:01
* @Description:测试zk创建新节点
*/
public class ZkSimpleTest{
public static void main(String[] args) throws Exception {
ZooKeeper zk = new ZooKeeper("127.0.0.1:2181",30000,new Student());
String node = "/hongNode";
Stat stat = zk.exists(node,false);
if(null==stat){
//新建节点
String createResult = zk.create(node,"hong".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println(createResult);
}
byte[] b = zk.getData(node,false,stat);
System.out.println(new String(b));
zk.close();
}
}--------------------
path:null
type:None
state:SyncConnected
--------------------
/hongNode
hong工具类
package com.hong.zk;
import com.hong.entity.Student;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;
import java.util.List;
import java.util.Scanner;
/**
* @author: csh
* @Date: 2020/12/11 12:01
* @Description:测试zk创建新节点
*
* create : 在树中的某个位置创建一个节点
* delete : 删除节点
* exists : 测试某个节点是否存在于某个位置
* get data : 从节点读取数据
* set data : 将数据写入节点
* get children : 检索节点的子节点列表
* sync : 等待数据传播
*/
public class ZkClientTest {
static ZooKeeper zk = null;
public static void main(String[] args) throws Exception {
System.out.println("输入：1创建节点，2删除节点，3查询节点所有子节点，9退出");
Scanner scanner = new Scanner(System.in);
Integer inNumber = 1;
try {
zk = new ZooKeeper("127.0.0.1:2181",30000,new Student());
while (inNumber!=0 && inNumber!=9){
inNumber = scanner.nextInt();
switch (inNumber){
case 1:
System.out.println("输入要创建节点的名称!");
scanner = new Scanner(System.in);
create(scanner.next());
continue;
case 2:
System.out.println("输入要删除节点的名称!");
scanner = new Scanner(System.in);
delete(scanner.next());
continue;
case 3:
System.out.println("查询节点所有子节点");
scanner = new Scanner(System.in);
prinChild(scanner.next());
continue;
default:
break;
}
}
System.out.println("结束！");
}catch (Exception e){
e.printStackTrace();
}finally {
if(zk!=null){
zk.close();
}
}
}
//创建节点
public static void create(String node){
if(!valid(node)){
return;
}
try {
Stat stat = zk.exists(node,false);
if(null==stat){
//新建节点
String createResult = zk.create(node,"hong".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println(createResult);
}
byte[] b = zk.getData(node,false,stat);
System.out.println(new String(b));
}catch (Exception e){
e.printStackTrace();
}
}
/**
*
* 功能描述: 删除
*
* @param:
* @return:
* @auther: csh
* @date: 2020/12/11 17:44
*/
public static void delete(String node){
if(!valid(node)){
return;
}
try {
Stat stat = zk.exists(node,false);
if(null==stat){
System.out.println("输入的值不存在！");
return;
}
//-1表示任何版本
zk.delete(node,-1);
}catch (Exception e){
e.printStackTrace();
}
}
public static void prinChild(String node){
if(!valid(node)){
return;
}
try {
Stat stat = zk.exists(node,false);
if(null!=stat){
List <String> children = zk.getChildren(node, true);
System.out.println(children);
}else{
System.out.println("没有获取到内容!");
}
}catch (Exception e){
e.printStackTrace();
}
}
/**
*
* 功能描述: 校验
*
* @param:
* @return:
* @auther: csh
* @date: 2020/12/11 17:37
*/
private static boolean valid(String val){
if(val==null||val==""){
System.out.println("输入的值为空！");
return false;
}
return true;
}
}通过客户端查询创建节点,运行zkCli.cmd
获取节点列表
ls /获取获点值
get /hongNode删除节点
delete /hongNode创建节点
set /hongNode hong1create /hongNode设置节点值
注意：运行过程中注意关闭防火墙 不则报以下问题！
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hongNode2
at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1933)
at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1961)
at com.hong.zk.ZkClientTest.main(ZkClientTest.java:28)spring实现zk连接，客户端
jdbc.properties
config.properties:
#数据库驱动
jdbc.driver=com.mysql.jdbc.Driver
#数据库连接url
jdbc.url=jdbc:mysql://localhost:3306/spring?useUnicode=true&characterEncoding=utf-8
#数据库用户名
jdbc.user=root
#数据库密码
jdbc.password=123456
#zk注册地址
zk.address=127.0.0.1:2181
#zk超时
zk.session.timeout=30000applicationContext.xml
<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
<!-- 配置组件扫描 -->
<context:component-scan base-package="com.hong.spring"></context:component-scan>
<!--加载配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--<context:property-placeholder location="classpath:zk.properties"/>-->
<!-- 开启注解 -->
<context:annotation-config />
<!--开启注解事务-->
<tx:annotation-driven transaction-manager="transactionManager" />
<!--放行静态资源-->
<mvc:default-servlet-handler />
<bean id="zkWatchend" class="com.hong.spring.config.ZkWatchend" />
<bean class="org.apache.zookeeper.ZooKeeper" id="zooKeeper">
<constructor-arg name="connectString" value="${zk.address}"/>
<constructor-arg name="sessionTimeout" value="${zk.session.timeout}"/>
<constructor-arg name="watcher" ref="zkWatchend"/>
</bean>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="internalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/pages/" />
<!-- 后缀 -->
<property name="suffix" value=".html" />
<property name="contentType" value="text/html"/>
</bean>
<!--开启mvc注解事务-->
<!-- 定义注解驱动 -->
<mvc:annotation-driven>
<mvc:message-converters>
<!-- 设置支持中文 -->
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"/>
</mvc:message-converters>
</mvc:annotation-driven>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<!-- 基础配置 -->
<property name="url" value="${jdbc.url}"></property>
<property name="driverClassName" value="${jdbc.driver}"></property>
<property name="username" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<!-- 关键配置 -->
<!-- 初始化时建立物理连接的个数。初始化发生在显示调用init方法，或者第一次getConnection时 -->
<property name="initialSize" value="3" />
<!-- 最小连接池数量 -->
<property name="minIdle" value="2" />
<!-- 最大连接池数量 -->
<property name="maxActive" value="15" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="10000" />
<!-- 性能配置 -->
<!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
<property name="poolPreparedStatements" value="true" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
<!-- 其他配置 -->
<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="60000" />
<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="300000" />
<!-- 建议配置为true，不影响性能，并且保证安全性。申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，
执行validationQuery检测连接是否有效。-->
<property name="testWhileIdle" value="true" />
<!-- 这里建议配置为TRUE，防止取到的连接不可用 ,申请连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。-->
<property name="testOnBorrow" value="true" />
<!-- 归还连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能 -->
<property name="testOnReturn" value="false" />
</bean>
<!--事务管理器-->
<!-- sqlSessionFactory -->
<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
<!-- 加载 MyBatis 的配置文件 -->
<property name="configLocation" value="classpath:mybatis-plus.xml"/>
<!-- 数据源 -->
<property name="dataSource" ref="dataSource"/>
<!-- 所有配置的mapper文件 -->
<property name="mapperLocations" value="classpath*:com/hong/spring/mapper/*.xml" />
</bean>
<!-- Mapper 扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 扫描 包下的组件 -->
<property name="basePackage" value="com.hong.spring.dao" />
<!-- 关联mapper扫描器 与 sqlsession管理器 -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>
<!--事务配置-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>pom.xml配置
<?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">
<parent>
<artifactId>spring_registration_center</artifactId>
<groupId>com.hong</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.hong</groupId>
<artifactId>spring_zk_client</artifactId>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<logback.version>1.2.3</logback.version>
<over-slf4j.version>1.7.25</over-slf4j.version>
<spring.version>4.3.11.RELEASE</spring.version>
<commons-dbcp.version>1.4</commons-dbcp.version>
<slf4j.version>1.7.12</slf4j.version>
<org.mybatis>3.1.0</org.mybatis>
</properties>
<dependencies>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus</artifactId>
<version>${org.mybatis}</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-extension</artifactId>
<version>${org.mybatis}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.5.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.34</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
<exclusions>
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<!--<dependency>-->
<!--<groupId>org.springframework</groupId>-->
<!--<artifactId>spring-jdbc</artifactId>-->
<!--<version>${spring.version}</version>-->
<!--</dependency>-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.70</version>
</dependency>
<!--引入连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.23</version>
</dependency>
<!--引入AOP-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<!--该包的主要作用是会去自动查找合适的日志记录框架进行记录-->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<!--引入日志-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.11.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.22</version>
<optional>true</optional>
</dependency>
<!-- 实现slf4j接口并整合 -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.2</version>
</dependency>
<!--引入hibernate-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.2.0.Final</version>
</dependency>
<!--引入orm-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.5.4-beta</version>
</dependency>
</dependencies>
<!--静态资源导出问题-->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<encoding>UTF-8</encoding>
<!--开启编译调试信息的开关-->
<debug>true</debug>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
</project>com.hong.spring.controller.ZkController
package com.hong.spring.controller;
import lombok.extern.log4j.Log4j2;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author: csh
* @Date: 2020/12/11 18:51
* @Description:
*/
@RestController
@RequestMapping("/zk")
@Log4j2
public class ZkController {
@Autowired
private ZooKeeper zk;
/**
*
* 功能描述: 添加
*
* @param:
* @return:
* @auther: csh
* @date: 2020/12/11 19:16
*/
@RequestMapping("/add")
public String add(String node){
if(StringUtils.isEmpty(node)){
log.error("参数异常！");
return "参数异常！";
}
try {
node="/"+node;
Stat stat = zk.exists(node,false);
if(null==stat){
//新建节点
String createResult = zk.create(node,"hong".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println(createResult);
}
byte[] b = zk.getData(node,false,stat);
log.info(new String(b));
}catch (Exception e){
e.printStackTrace();
return "失败";
}
return "成功";
}
/**
*
* 功能描述: 设置
*
* @param:
* @return:
* @auther: csh
* @date: 2020/12/11 19:17
*/
@RequestMapping("/set")
public String add(String node,String val){
if(StringUtils.isEmpty(node)){
log.error("参数异常！");
return "参数异常！";
}
try {
node ="/"+node;
Stat stat = zk.exists(node,true);
if(null==stat){
//新建节点
log.error("设置失败!");
return "设置失败!";
}
zk.setData(node, val.getBytes(), -1);
byte[] b = zk.getData(node,true,stat);
log.info(new String(b));
return new String(b);
}catch (Exception e){
e.printStackTrace();
}
return null;
}
}注：这里仅贴核心配置，其他请拉项目参考
测试
http://localhost:8088/zk/add?node=hong34
http://localhost:8088/zk/set?node=hong34&val=1111111111111
springboot实现zk连接，客户端
pom.xml
<?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">
<parent>
<artifactId>springboot_all</artifactId>
<groupId>com.hong.springboot</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.hong.springboot</groupId>
<artifactId>springboot_zk_client</artifactId>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.14</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- zkclient -->
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.11</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>application.properties
#端口
server.port=8089
#集群的话，地址填写为127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
zookeeper.address = 127.0.0.1:2181
zookeeper.timeout = 10000com.hong.config.ZkConfig
package com.hong.config;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.concurrent.CountDownLatch;
/**
* @author: csh
* @Date: 2020/12/14 11:19
* @Description:zk配置
*/
@Configuration
public class ZkConfig {
private static final Logger logger = LoggerFactory.getLogger(ZkConfig.class);
@Value("${zookeeper.address}")
private String connectString;
@Value("${zookeeper.timeout}")
private int timeout;
@Bean(name = "zkClient")
public ZooKeeper zkClient() {
ZooKeeper zooKeeper = null;
try {
CountDownLatch countDownLatch = new CountDownLatch(1);
zooKeeper = new ZooKeeper(connectString, timeout, new Watcher() {
@Override
public void process(WatchedEvent watchedEvent) {
if(Event.KeeperState.SyncConnected==watchedEvent.getState()){
//如果收到了服务端的响应事件,连接成功
countDownLatch.countDown();
}
}
});
countDownLatch.await();
}catch (Exception ex)
{
logger.error("初始化ZooKeeper连接异常....】={}",ex);
}
return zooKeeper;
}
}com.hong.service.IZkService
/**
* @author: csh
* @Date: 2020/12/14 11:20
* @Description:zk服务配置接口
*/
public interface IZkService {
/**
* 判断指定节点是否存在
* @param path
* @param needWatch 指定是否复用zookeeper中默认的Watcher
* @return
*/
Stat exists(String path, boolean needWatch);
/**
* 检测结点是否存在 并设置监听事件
* 三种监听类型：创建，删除，更新
*
* @param path
* @param watcher 传入指定的监听类
* @return
*/
Stat exists(String path, Watcher watcher );
/**
* 创建持久化节点
* @param path
* @param data
*/
boolean createNode(String path, String data);
/**
* 修改持久化节点
* @param path
* @param data
*/
boolean updateNode(String path, String data);
/**
* 删除持久化节点
* @param path
*/
boolean deleteNode(String path);
/**
* 获取当前节点的子节点(不包含孙子节点)
* @param path 父节点path
*/
List<String> getChildren(String path) throws KeeperException, InterruptedException;
/**
* 获取指定节点的值
* @param path
* @return
*/
String getData(String path, Watcher watcher);
}com.hong.service.impl.ZkServiceImpl
package com.hong.service.impl;
import com.hong.service.IZkService;
import org.apache.zookeeper.*;
import org.apache.zookeeper.data.Stat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @author: csh
* @Date: 2020/12/14 11:21
* @Description:zk相关方法实现
*/
@Service
@Component
public class ZkServiceImpl implements IZkService {
private static final Logger logger = LoggerFactory.getLogger(ZkServiceImpl.class);
@Autowired
private ZooKeeper zkClient;
@Override
public Stat exists(String path, boolean needWatch) {
try {
return zkClient.exists(path,needWatch);
} catch (Exception e) {
logger.error("【断指定节点是否存在异常】{},{}",path,e);
return null;
}
}
@Override
public Stat exists(String path, Watcher watcher) {
try {
return zkClient.exists(path,watcher);
} catch (Exception e) {
logger.error("【断指定节点是否存在异常】{},{}",path,e);
return null;
}
}
@Override
public boolean createNode(String path, String data) {
try {
zkClient.create(path,data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
return true;
} catch (Exception e) {
logger.error("【创建持久化节点异常】{},{},{}",path,data,e);
return false;
}
}
@Override
public boolean updateNode(String path, String data) {
try {
//zk的数据版本是从0开始计数的。如果客户端传入的是-1，则表示zk服务器需要基于最新的数据进行更新。如果对zk的数据节点的更新操作没有原子性要求则可以使用-1.
//version参数指定要更新的数据的版本, 如果version和真实的版本不同, 更新操作将失败. 指定version为-1则忽略版本检查
zkClient.setData(path,data.getBytes(),-1);
return true;
} catch (Exception e) {
logger.error("【修改持久化节点异常】{},{},{}",path,data,e);
return false;
}
}
@Override
public boolean deleteNode(String path) {
try {
//version参数指定要更新的数据的版本, 如果version和真实的版本不同, 更新操作将失败. 指定version为-1则忽略版本检查
zkClient.delete(path,-1);
return true;
} catch (Exception e) {
logger.error("【删除持久化节点异常】{},{}",path,e);
return false;
}
}
@Override
public List<String> getChildren(String path) throws KeeperException, InterruptedException {
List<String> list = zkClient.getChildren(path, false);
return list;
}
@Override
public String getData(String path, Watcher watcher) {
try {
Stat stat=new Stat();
byte[] bytes=zkClient.getData(path,watcher,stat);
return new String(bytes);
}catch (Exception e){
e.printStackTrace();
return null;
}
}
}com.hong.service.impl.WaterServiceImpl
package com.hong.service.impl;
import lombok.extern.slf4j.Slf4j;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.springframework.stereotype.Service;
/**
*
* 功能描述: zk监听
*
* @param:
* @return:
* @auther: csh
* @date: 2020/12/14 14:21
*/
@Service
@Slf4j
public class WaterServiceImpl implements Watcher {
@Override
public void process(WatchedEvent event) {
log.info("【Watcher监听事件】={}",event.getState());
log.info("【监听路径为】={}",event.getPath());
log.info("【监听的类型为】={}",event.getType()); // 三种监听类型：创建，删除，更新
}
}com.hong.Application
package com.hong;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
*
* 功能描述: zk客户端
*
* @param:
* @return:
* @auther: csh
* @date: 2020/12/14 11:30
*/
@SpringBootApplication(scanBasePackages = "com.hong")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class);
}
}运行结果
修改：http://localhost:8089/getdata?path=hong34
修改：http://localhost:8089/updateNode?path=hong34&data=2222222222222222
查看值：
相对来说spring boot集成zk比mvc好集成多了。有没有发现其实zk也是可以做分布式配置中心的，当然也可以通过zk来实现分布式锁，相对于redis，zk实现会比较繁琐。这里不列举~,注意:实际工作中，zk是以集群方式搭建。
Eureka
最后
参考文章：
https://www.cnblogs.com/dalianpai/p/12255458.html
http://www.fengzhihai.cn/2020/03/31/%E6%9C%8D%E5%8A%A1%E6%B3%A8%E5%86%8C%E4%B8%AD%E5%BF%83%E5%AF%B9%E6%AF%94/
https://www.jianshu.com/p/5014bb302c7d
https://jishuin.proginn.com/p/763bfbd31b0e
https://blog.csdn.net/u013938578/article/details/104119520