1. springMVC+spring+mybatis的整合大致结构：
（1）config/mybatis/SqlMapConfig.xml中放置mybatis的配置文件，由于这个例子很简单，所以配置得比较简单。在spring与mybatis的整合中，在这里不用配置mapper，因为在mybatis-spring整合jar包中有mapper的扫描类。
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration></configuration>（2）config/spring/appliacationContext.xml中配置的是mybatis和spring整合的配置。其中包括数据源（数据池）的配置、sqlSessionFactory的配置、mapper扫描器的配置还有事务的配置。目前aop还不是很会，所以事务配置并没有在程序中体现。
<?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: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-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd " default-autowire="byName"> <!-- 读取配置文件 --> <bean id="config" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:db.properties</value> </list> </property> </bean> <!-- 配置数据库连接池 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${username}"/> <property name="password" value="${password}"/> <property name="driverClass" value="${driverClassName}"/> <property name="jdbcUrl" value="${jdbcUrl}"/> <!--<property name="acquireIncrement" value="${c3p0.acquireIncrement}"/>--> <property name="acquireIncrement" value="${c3p0.acquireIncrement}"/> <property name="initialPoolSize" value="${c3p0.initialPoolSize}"/> <property name="minPoolSize" value="${c3p0.minPoolSize}"/> <property name="maxPoolSize" value="${c3p0.maxPoolSize}"/> <property name="maxIdleTime" value="${c3p0.maxIdleTime}"/> <property name="idleConnectionTestPeriod" value="${c3p0.idleConnectionTestPeriod}"/> <property name="maxStatements" value="${c3p0.maxStatements}"/> <property name="numHelperThreads" value="${c3p0.numHelperThreads}"/> </bean> <!-- 配置sqlSessionFactory --> <bean id="mySqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"/> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.hggggc.ssm.mapper"/> <property name="sqlSessionFactoryBeanName" value="mySqlSessionFactory"/> </bean> <bean class="com.hggggc.ssm.service.DeptServiceImpl" id="deptService"/> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!--<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="SUPPORTS" read-only="true"/>--> <!--</tx:attributes>--> <!--</tx:advice>--> <!--<aop:config>--> <!--<aop:advisor advice-ref="Txadvice" pointcut="execution(* com.hggggc.ssm.service.*.*(..))"/>--> <!--</aop:config>--></beans> （3）config/spring/springMVC.xml配置的就是springMVC框架所用到的处理器映射器。
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:apop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/mvc/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/mvc/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd"> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/> <!--3.1后的配置--> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/> <!--扫描组件--> <context:component-scan base-package="com.hggggc.ssm.controller"></context:component-scan></beans> （4）db.properties里面配置了 数据库驱动所需的各种属性包括：驱动类名、用户名、密码等还有数据池的属性
driverClassName=com.mysql.jdbc.DriverjdbcUrl=jdbc:mysql://localhost:3306/mydb1?rewriteBatchedStatements=trueusername=rootpassword=1234c3p0.acquireIncrement=3c3p0.initialPoolSize=3c3p0.idleConnectionTestPeriod=60c3p0.minPoolSize=5c3p0.maxPoolSize=100c3p0.maxStatements=100c3p0.numHelperThreads=10c3p0.maxIdleTime=60（5）log4j.properties是log的配置文件，不太懂。
（6）有关web.xml的配置
<?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"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/*.xml</param-value> </context-param><listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener> <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> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping></web-app>接下来只需写：
（1）mapper文件：mapper.java文件和mapper.xml文件同名同目录（dao）
（2）service：写service接口，并实现，最后配置。在实现类中注入mapper，此时会报错，因为还没扫描，并不影响程序运行。
<bean class="com.hggggc.ssm.service.DeptServiceImpl" id="deptService"/> （3）controller（handler）：在其中注入service
2.spring+mybatis 报Could not load driverClass ${jdbc.driverClass}
<!-- 配置sqlSessionFactory --><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"/></bean><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.hggggc.ssm.mapper"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/></bean>改为
<!-- 配置sqlSessionFactory --><bean id="mySqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"/></bean><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.hggggc.ssm.mapper"/> <property name="sqlSessionFactoryBeanName" value="mySqlSessionFactory"/></bean>在spring里使用org.mybatis.spring.mapper.MapperScannerConfigurer 进行自动扫描的时候，设置了sqlSessionFactory 的话，可能会导致PropertyPlaceholderConfigurer失效，也就是用${jdbc.username}这样之类的表达式，将无法获取到properties文件里的内容。 导致这一原因是因为，MapperScannerConigurer实际是在解析加载bean定义阶段的，这个时候要是设置sqlSessionFactory的话，会导致提前初始化一些类，这个时候，PropertyPlaceholderConfigurer还没来得及替换定义中的变量，导致把表达式当作字符串复制了。
所以将id改了就解决问题了