项目SpringMVC+Spring+Mybatis 整合环境搭建(1)-> Spring+Mybatis搭建

目录结构

第一步:web.xml 先配置contextConfigLocation 对应的application-context.xml文件

打开webapp\WEB-INF\web.xml, 配置spring监听器和上下文

<?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/j2ee" xmlns:javaee="http://java.sun.com/xml/ns/javaee"
	xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
	id="WebApp_ID" version="2.4">

	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:application-context.xml</param-value>
	</context-param>

	<listener>
	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

第二步:在application-context.xml中配置

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<import resource="config/*.xml" />
</beans>

这样配置可以XML文件的解耦，以后我们可以根据需要在创建相应的XML放在config目录下就可以，不会影响到其他配置

第三步:在classpath:config/目录下配置扫描标签,取名annotation.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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<!--spring 扫包   @Service .....-->
	<context:component-scan base-package="cn.easybuy">
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>

    <context:annotation-config/>

</beans>

这里配置我们需要扫描的组件，指定扫描cn.easybuy 目录下的包，由于该项目希望 SpringMVC去管理 Controller，Spring去管理Service  达到一个三层解耦的效果，Mybatis去管理Dao ,所以我们不希望spring去扫Controller注解下的类，这里需要用到<context:exclude-filter /> 标签去排除。

第四步:在classpath:config/目录下配置读取property标签,取名property.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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<!-- 读取jdbc配置 -->
	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<!-- jdbc配置 -->
				<value>classpath:properties/jdbc.properties</value>
			</list>
		</property>
	</bean>

</beans>

这里用到PropertyPlaceholderConfigurer 可以帮我们去加载N个配置文件，以后我们还需要加载其他配置文件，只需要在里面添加即可，这里的jdbc.properties是存放我们数据库连接的一些信息

第五步:在classpath:config/目录下配置数据源C3p0标签,取名jdbc.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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<!-- c3p0-->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="${driverClass}"/>
		<property name="jdbcUrl" value="${jdbcUrl}"></property>
		<property name="user" value="${user}" />
		<property name="password" value="${password}"/>
	</bean>

</beans>

项目为什么用c3p0而不直接用jdbc?因为c3p0是一个数据库连接池，有两个优点：1.可以连接多个数据库 2.加入连接中断，会帮我们自动重连

第六步:在classpath:config/目录下配置Mybatis配置标签,取名mybatis.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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<!--mybatis  sessionFactory配置-->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<property name="mapperLocations" value="classpath:cn/easybuy/core/dao/*.xml"/>
		<property name="typeAliasesPackage" value="cn.easybuy.core.bean"/>
	</bean>

	<!-- 扫包  -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage"  value="cn.easybuy.core.dao"/>
	</bean>

</beans>

这里配置sessionFactory,用来帮我们创建session, mapperLocations 的值就是我们以后dao需要用的映射文件, typeAliasesPackage 的值是我们持久化用到的实体类，MapperScannerConfigurer会帮我们扫描cn.easybuy.core,dao下的所有类

第七步:classpath:config/目录下配置事务,取名transation.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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

	<!-- spring 事务 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"/>
	</bean>
	<!-- 开启事务注解 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

这里配置spring的事务，dataSource是我们上面配置的数据源，因为我们全程用注解操作，所以需要开启事务注解

第八步:在classpath:properties/目录下配置数据库信息,取名jdbc.properties

driverClass=com.mysql.jdbc.Driver

jdbcUrl=jdbc:mysql://localhost:3306/easyBuy?characterEncoding=UTF-8

user=root

password=root

这里存放一些我们数据库连接的信息，这里用到的是Mysql