Zookeeper注册中心概述
Zookeeper介绍(配合Dubbox使用)
官方推荐使用zookeeoer注册中心,注册中心负责服务地址的注册和查找,相当于目录服务,提供提供者和消费者只在启动时与注册中心交互,注册中心不转发请求,压力小.
zookeeper是Apacahe Hadoop的子项目,是一个树形的目录服务,支持变更推送,适合作为Dubbox服务的注册中心,工业强度较高,可用于生产环境.
Zookeeper在Linux系统的安装
安装步骤:
第一步:安装Jdk
第二步:把zookeeper的压缩包上传到linux系统.
第三步:解压缩压缩包
tar -zxvf zookeeper-3.4.6.tar.gz
第四步:进入conf目录,吧zoo sample.cfg改名为zoo.cfg
Zookeeper服务启动
进入bin目录,启动服务输入命令
./zkServer.sh start
输出一下内容表示启动成功
关闭服务输入命令
./zkServer.sh stop
查看状态:
./zkServer.sh status
如果启动状态,提示:
如果未启动状态,提示:
如果想要配置离线约束:
这个地址:http://code.alibabatech.com/schema/dubbo/dubbo.xsd
不配置也是可以的.
入门的一个小Demo
配置Maven环境
-DarchetypeCatalog=internal
服务提供者开发:
开发步骤:
（1）创建Maven工程（WAR）dubboxdemo-service, war项目 ，在pom.xml中引入依赖
<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>cn.itcast.dubboxdemo</groupId>
<artifactId>dubboxdemo-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<spring.version>4.2.4.RELEASE</spring.version>
</properties>
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- dubbo相关 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.8.4</version>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.11.0.GA</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.28</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<!-- 指定端口 -->
<port>8081</port>
<!-- 请求路径 -->
<path>/</path>
</configuration>
</plugin>
</plugins>
</build>
</project>
（2）在工程的webapps下创建WEB-INF文件夹，创建web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <!-- 加载spring容器 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext*.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app>
（3）创建业务接口
创建包cn.itcast.dubbodemo.service，用于存放业务接口，创建接口
package cn.itcast.dubbodemo.service; /** * 业务接口 * @author Administrator * */ public interface UserService { public String getName(); }
（4）创建业务实现类
创建包cn.itcast.dubbodemo.service.impl ，用于存放业务实现类。创建业务实现类：
package cn.itcast.dubbodemo.service.impl; import com.alibaba.dubbo.config.annotation.Service; import cn.itcast.dubbodemo.service.UserService; @Service public class UserServiceImpl implements UserService { public String getName() { return "itcast"; } }
注意：Service注解与原来不同，需要引入com.alibaba包下的
（5）编写配置文件
在src/main/resources下创建applicationContext-service.xml ,内容如下：
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc" 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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <dubbo:application name="dubboxdemo-service"/> <dubbo:registry address="zookeeper://192.168.200.128:2181"/> <dubbo:annotation package="cn.itcast.dubboxdemo.service" /> </beans>
注意：dubbo:annotation用于扫描@Service注解。
3.5.2服务消费者开发
开发步骤：
（1）创建Maven工程（WAR）dubboxdemo-web, war项目，在pom.xml引入依赖，同“dubboxdemo-service”工程。区别就是把tomcat插件的运行端口改为8082 。
（2）在webapps目录下创建WEB-INF 目录，并创建web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <!-- 解决post乱码 --> <filter> <filter-name>CharacterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 指定加载的配置文件 ，通过参数contextConfigLocation加载--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext-web.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>
（3）拷贝业务接口
将“dubboxdemo-service”工程的cn.itcast.dubboxdemo.service 包以及下面的接口拷贝至此工程。
（4）编写Controller
package cn.itcast.dubboxdemo.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import cn.itcast.dubbodemo.service.UserService; @Controller @RequestMapping("/user") public class UserController { @Reference private UserService userService; @RequestMapping("/showName") @ResponseBody public String showName(){ return userService.getName(); } }
（5）编写spring配置文件
在src/main/resources下创建applicationContext-web.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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc" 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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes" value="application/json"/> <property name="features"> <array> <value>WriteMapNullValue</value> <value>WriteDateUseDateFormat</value> </array> </property> </bean> </mvc:message-converters> </mvc:annotation-driven> <!-- 引用dubbo 服务 --> <dubbo:application name="dubboxdemo-web" /> <dubbo:registry address="zookeeper://192.168.200.128:2181"/> <dubbo:annotation package="cn.itcast.dubboxdemo.controller" /> </beans>
测试:
启动服务消费方和服务提供方,两个tomcat,以内使用了插件,所以直接启动就好.
tomcat7:run
在浏览器输入http://localhost:8082/user/showName.do，查看浏览器输出结果
|
package cn.itcast.dubbodemo.service.impl; import com.alibaba.dubbo.config.annotation.Service; import cn.itcast.dubbodemo.service.UserService; @Service publicclass UserServiceImpl implements UserService { public String getName() { return"itcast"; } } |
本文来自博客园，作者：King-DA，转载请注明原文链接：https://www.cnblogs.com/qingmuchuanqi48/p/10704558.html
