Mac 下ZooKeeper安装和使

Mac 下ZooKeeper安装和使用

Apache ZooKeeper分布式协调系统是构建分布式应用程序的高性能服务。

1.下载ZooKeeper

环境要求：ZooKeeper服务器是用Java创建的，它运行在JVM之上。需要安装JDK 7或更高版本。

https://zookeeper.apache.org/releases.html

或者直接去资源包目录下载

https://archive.apache.org/dist/zookeeper/

2. 配置ZooKeeper

和Tomcat一样，下载后，解压到你指定的目录即可。

进入conf文件夹中,copy一份配置文件，并指定你的存储数据data目录

你可以使用

dataDir=../data

这样就可以在你的conf的上级目录创建data目录，用于存储数据

3. 启动ZooKeeper

进入bin目录

启动命令

./zkServer.sh start

查看状态

./zkServer.sh status

停止命令

./zkServer.sh stop

启动客户端

./zkCli.sh

4. 配置环境变量（可选）

打开终端输入以下命令，打开 .bash_profile 文件

sudo vi ~/.bash_profile

在.bash_profile添加你的zkServer所在目录。

这样你打开终端可以在任意目录下启动zkServer

zkServer.sh start

5. ZooKeeper在Spring中注册

新建Spring项目注册zookeeper服务，配合dubbo使用

1. 在pom.xml添加如下配置

   <packaging>warpackaging>
   <properties>
           <dubbo.version>2.7.4.1dubbo.version>
           <zookeeper.version>4.0.0zookeeper.version>
   properties>
   
           <dependency>
               <groupId>org.apache.dubbogroupId>
               <artifactId>dubboartifactId>
               <version>${dubbo.version}version>
           dependency>
           
           <dependency>
               <groupId>org.apache.curatorgroupId>
               <artifactId>curator-frameworkartifactId>
               <version>${zookeeper.version}version>
           dependency>
           
           <dependency>
               <groupId>org.apache.curatorgroupId>
               <artifactId>curator-recipesartifactId>
               <version>${zookeeper.version}version>
           dependency>
   

   **注意：**注册zookeeper服务，Service模块要打包方式要改为war包

2. 在applicationContext.xml添加如下配置

   
   <beans xmlns="http://www.springframework.org/schema/beans"
   	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   	   xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xmlns:context="http://www.springframework.org/schema/context"
   	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
           http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
   
   	<context:component-scan base-package="com.example.service" />
   
   	
   	
   	<dubbo:application name="dubbo-service">
   		<dubbo:parameter key="qos.port" value="20282"/>
   	dubbo:application>
   
   	<dubbo:protocol port="20281"/>
   	
   	<dubbo:registry address="zookeeper://127.0.0.1:2181"/>
   	<dubbo:metadata-report address="zookeeper://127.0.0.1:2181"/>
   	
   	<dubbo:annotation package="com.example.service.impl" />
   beans>
   

3. 在Service的类上面改用dubbo下的@Service注解

   import org.apache.dubbo.config.annotation.Service;
   
   //@Service
   @Service
   public class UserServiceImpl implements UserService {
   
       public String sayHello() {
           return "Hello DubboAndZookeeper";
       }
   
       public User getUser() {
           User user = new User(1, "zhangsan", "123456");
           return user;
       }
   }
   

   **注意：**如果使用自定义对象，那么这个对象要实现Serializable接口

6. ZooKeeper在Spring中使用

1. 在SpringWeb项目的pom.xml文件中添加如下依赖

   <packaging>warpackaging>
   <properties>
           <dubbo.version>2.7.4.1dubbo.version>
           <zookeeper.version>4.0.0zookeeper.version>
   properties>
   
           <dependency>
               <groupId>org.apache.dubbogroupId>
               <artifactId>dubboartifactId>
               <version>${dubbo.version}version>
           dependency>
           
           <dependency>
               <groupId>org.apache.curatorgroupId>
               <artifactId>curator-frameworkartifactId>
               <version>${zookeeper.version}version>
           dependency>
           
           <dependency>
               <groupId>org.apache.curatorgroupId>
               <artifactId>curator-recipesartifactId>
               <version>${zookeeper.version}version>
           dependency>
   

2. 在applicationContext.xml添加如下配置

   
   <beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
          xmlns:mvc="http://www.springframework.org/schema/mvc"
          xmlns:context="http://www.springframework.org/schema/context"
          xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
            http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
       <mvc:annotation-driven/>
       <context:component-scan base-package="com.example.controller"/>
       
       
       <dubbo:application name="dubbo-web" >
           <dubbo:parameter key="qos.port" value="33333"/>
       dubbo:application>
       
       <dubbo:protocol port="20282"/>
       
       <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
       
       <dubbo:annotation package="com.example.controller" />
   beans>
   

3. 在Controller类上面把@Autowired注入改为@Reference注入

   @RestController
   @RequestMapping("/user")
   public class UserController {
   //    @Autowired
       /*
           1. 从zookeeper注册中心获取userService的访问url
           2. 进行远程调用RPC
           3. 将结果封装为一个代理对象。给变量赋值
   
        */
       @Reference//远程注入
       public UserService userService;
       @RequestMapping("/sayHello")
       public String sayHello(){
           return userService.sayHello();
       }
   
       @RequestMapping("/getUserById")
       public String getUserById(){
           User user = userService.getUser();
           System.out.println(user.toString());
           return user.toString();
       }
   }