Dubbo、ZooKeeper、SpringMVC整合(登录案例)
事先准备:
1:将zk集群安装到linux系统上并启动,我这里是安装了三台,当然你也可以使用linxu或者windows的单机版,windows单机版的使用和配置都比较简单
2:(此步可以不用)将dubbo-admin安装到linxu上的tomcat中,用于查看生产者和消费者的使用情况,就是dubbo的监视中心
3:在父工程中引入依赖,父工程中导入依赖之后,他的子工程(module)就可以不用导入依赖了
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!--日志--> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.32</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.2.0.RELEASE</version> </dependency> <dependency> <groupId>com.github.sgroschupf</groupId> <artifactId>zkclient</artifactId> <version>0.1</version> </dependency> <dependency> <groupId>com.101tec</groupId> <artifactId>zkclient</artifactId> <version>0.10</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> <version>2.5.3</version> <exclusions> <exclusion> <groupId>org.springframework</groupId> <artifactId>spring</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.2.0.RELEASE</version> </dependency> <!--MyBatis和Spring的整合包 由MyBatis提供--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <!--MyBatis的核心jar文件--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.1</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> </dependencies>
第一步:创建Service工程
这个工程中主要放的就是生产者和消费者共用的实体类(Entity)和Service接口,生产者和消费者若要使用实体类或者接口的时候,就需要引用Service工程的依赖
<dependency> <groupId>com.yjc</groupId> <artifactId>Service</artifactId> <version>1.0-SNAPSHOT</version> <scope>compile</scope> </dependency>
注意:dubbo环境中的实体类,由于要进行网络传输,必须要实现Serializable
第二步:创建Producers(生产者)
生产者的主要作用就是为消费者提供接口的实现类,dao层和接口的实现类和之前并没有什么多大的区别,只是接口的实现类实现的接口是之前创建的Service中的接口
Dao层接口,这里为了简便直接使用的是注解实现的方式,省略leMapper.xml
package com.yjc.dao; import com.yjc.entity.User; import org.apache.ibatis.annotations.Select; import org.springframework.stereotype.Repository; @Repository public interface Login { @Select("SELECT * FROM myuser WHERE username=#{userName}") User checkLogin(String userName); }
接口的实现类
package com.yjc.impl; import com.yjc.dao.Login; import com.yjc.entity.User; import com.yjc.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service("iUserService") public class IUserServiceImpl implements IUserService { @Autowired private Login login; @Override public User login(String userName, String password) { User user = login.checkLogin(userName); if (user!=null){ if (user.getPassword().equals(password)) { return user; } } return null; } }
applicationContext.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:dubbo="http://code.alibabatech.com/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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 导入数据库连接文件--> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="ignoreUnresolvablePlaceholders" value="true" /> <property name="location" value="classpath:jdbc.properties"/> </bean> <!--配置数据源--> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="password" value="${jdbc.password}"/> <property name="username" value="${jdbc.user}"/> </bean> <!--配置MyBatis的核心对象SqlSessionFactoryBean--> <bean id="SessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> </bean> <!--创建包扫描器(借助dao接口实现动态代理)--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer "> <property name="basePackage" value="com.yjc.dao"/> </bean> <context:component-scan base-package="com.yjc"/> <context:annotation-config/> <mvc:annotation-driven/> <!-- 提供方应用信息,用于计算依赖关系 --> <dubbo:application name="app-provider"/> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="192.168.118.3:2181,192.168.118.4:2181,192.168.118.5:2181" protocol="zookeeper" /> <!-- 用dubbo协议在20880端口暴露服务 --> <dubbo:protocol name="dubbo" port="20880" /> <!-- 声明需要暴露的服务接口 --> <dubbo:service interface="com.yjc.service.IUserService" ref="iUserService" /> </beans>
jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mydata jdbc.user=root jdbc.password=123
启动项目.将服务注册到注册中心上去,当然你也可以将项目部署到tomcat上
import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.io.IOException; public class RunProducers { public static void main(String[] args) throws IOException { ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); System.out.println("服务已经注册到服务中心当中"); System.in.read(); } }
第三步:创建Consumer(消费者)工程
consumer项目的基本上会是一个web项目,使用controller和页面进行交互,所有说消费者里就只有Controller和页面
FirstController控制器
package com.yjc.controller; import com.yjc.entity.User; import com.yjc.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import javax.annotation.Resource; @Controller @RequestMapping("/first") public class FirstController { @RequestMapping("/getlogin") public String login(){ return "login"; } @Autowired private IUserService iUserService; @RequestMapping("/checkLogin") public String checkLogin(User user){ System.out.println(user.getPassword()+"----------"+user.getUserName()); User login = iUserService.login(user.getUserName(), user.getPassword()); if (login!=null){ return "welcome"; } return "login"; } }
applicationContext.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:dubbo="http://code.alibabatech.com/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://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.yjc"/> <mvc:annotation-driven/> <context:annotation-config/> <!-- 配置视图解析器,设置前缀和后缀,自动拼接 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --> <property name="prefix" value="/jsp/" /> <!-- 后缀 --> <property name="suffix" value=".jsp" /> </bean> <mvc:default-servlet-handler/> <!-- 提供方应用信息,用于计算依赖关系 --> <dubbo:application name="consumer"/> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="192.168.118.3:2181,192.168.118.4:2181,192.168.118.5:2181" protocol="zookeeper" /> <!-- 用dubbo协议在20880端口暴露服务 --> <dubbo:protocol name="dubbo" port="20880" /> <!-- 生成远程服务代理,可以和本地bean一样使用demoService --> <dubbo:reference id="iUserService" interface="com.yjc.service.IUserService" /> </beans>
Web.xml,用于加载xml文件,以及其他配置
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <!--Spring和MyBatis整合的核心配置--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!--配置SpringMVC的核心控制器DispatcherServlet--> <servlet> <servlet-name>SpringMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:applicationContext.xml</param-value> </init-param> </servlet> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet-mapping> <servlet-name>SpringMVC</servlet-name> <!--设置映射路径,/代表所有的请求都会被核心控制器映射到对应的Controller中--> <url-pattern>/</url-pattern> </servlet-mapping> <!--编码过滤器--> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <!--初始化参数--> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>