SpringMVC学习--springmvc和mybatis整合

时间:2022-04-27 22:32:06
SpringMVC学习--springmvc和mybatis整合
  • 简介

  springMVC是表现层,service充当业务层,mybatis作为持久层,通过spring将这三层整合起来。如下图:

SpringMVC学习--springmvc和mybatis整合

  第一步:整合dao层

  mybatis和spring整合,通过spring管理mapper接口。使用mapper的扫描器自动扫描mapper接口在spring中进行注册。

  第二步:整合service层

  通过spring管理 service接口,使用配置方式将service接口配置在spring配置文件中,实现事务控制。

  第三步:整合springmvc

  由于springmvc是spring的模块,不需要整合。

  • 整合Dao层

  也就是Spring与MyBatis的整合

  1、MyBatis的配置:SqlMapConfig.xml

 <configuration>
<typeAliases>
<!-- 批量别名定义,扫描整个包下的类,别名为类名(首字母大写或小写都可以) -->
<package name="com.luchao.pojo" />
</typeAliases>
</configuration>

  2、Dao的配置:applicationContext-dao.xml

  配置数据源、SqlSessionFactory、Mapper扫描器

 <beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 数据源,使用dbcp -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="5" />
</bean>
<!-- sqlSessinFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 加载mybatis的配置文件 -->
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" />
<!-- 数据源 -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 配置mapper扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.luchao.mapper"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
</beans>

  3、定于Po、Mapper接口和Mapper映射文件。

  • 整合Service

  让spring管理service

  定于service接口:

 public interface ItemsService {
// 获取商品列表
public List<ItemsCustom> findItemsList(ItemsQueryVo itemsQueryVo)
throws Exception;
}

  service实现类:

 public class ItemsServiceImpl implements ItemsService {

     @Autowired
private ItemsMapperCustom itemsMapperCustom; @Override
public List<ItemsCustom> findItemsList(ItemsQueryVo itemsQueryVo)
throws Exception {
// 通过itemsMapperCustom查询数据库
return itemsMapperCustom.findItemsList(itemsQueryVo);
}
}

  在spring容器中中配置service:applicationContext-service.xml

 <bean id="itemsService" class="com.luchao.service.ItemsServiceImpl"></bean>

  事务控制:applicationContext-transaction.xml

 <beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<!-- 事务管理器 对mybatis操作数据库事务控制,spring使用jdbc的事务控制类 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 数据源 dataSource在applicationContext-dao.xml中配置了 -->
<property name="dataSource" ref="dataSource" />
</bean> <!-- 通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="delete*" propagation="REQUIRED"/>
<tx:method name="insert*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
<tx:method name="find*" propagation="REQUIRED" read-only="true"/>
<tx:method name="get*" propagation="REQUIRED" read-only="true"/>
<tx:method name="select*" propagation="REQUIRED" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- aop -->
<aop:config>
<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.luchao.service.*.*(..))"/>
</aop:config>
</beans>

  通过AOP将事务织入了符合一定条件的方法上面。

  • 整合springMVC

  配置处理器映射器、适配器、视图解析器:springmvc.xml

 <beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<!-- 扫描controller注解,多个包中间使用半角逗号分隔 -->
<context:component-scan base-package="com.luchao.controller"/>
<mvc:annotation-driven/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>

  配置前端控制器:web.xml中加入:

 <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:spring/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

  编写控制器:

 @Controller
@RequestMapping("/items")
public class ItemController {
@Autowired
private ItemsService itemsService; // 商品查询
@RequestMapping("/queryItems")
public ModelAndView queryItems() throws Exception {
// 调用service查找 数据库,查询商品列表
List<ItemsCustom> itemsList = itemsService.findItemsList(null); // 返回ModelAndView
ModelAndView modelAndView = new ModelAndView();
// 相当 于request的setAttribut,在jsp页面中通过itemsList取数据
modelAndView.addObject("itemsList", itemsList); // 指定视图
// 下边的路径,如果在视图解析器中配置jsp路径的前缀和jsp路径的后缀,修改为
// modelAndView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");
// 上边的路径配置可以不在程序中指定jsp路径的前缀和jsp路径的后缀
modelAndView.setViewName("items/itemsList"); return modelAndView;
}
}

  加载spring容器:

  将mapper、service、controller加载到spring容器中。在web.xml中,添加spring容器监听器,加载spring容器。

 <!-- 加载spring容器 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/spring/applicationContext-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>