在整合Spring + Mybatis框架的时候，自动扫描配置都已经配置好了。

配置如下：

<?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:mvc="http://www.springframework.org/schema/mvc"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd

                        http://www.springframework.org/schema/context

                        http://www.springframework.org/schema/context/spring-context-3.1.xsd

                        http://www.springframework.org/schema/mvc

                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!-- 自动扫描 -->

    <context:component-scan base-package="com.aheizi" />

    <!-- 引入配置文件 -->

    <bean id="propertyConfigurer"

        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

        <property name="location" value="classpath:properties/jdbc.properties" />

    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"

        destroy-method="close">

        <property name="driverClassName" value="${driver}" />

        <property name="url" value="${url}" />

        <property name="username" value="${username}" />

        <property name="password" value="${password}" />

        <!-- 初始化连接大小 -->

        <property name="initialSize" value="${initialSize}"></property>

        <!-- 连接池最大数量 -->

        <property name="maxActive" value="${maxActive}"></property>

        <!-- 连接池最大空闲 -->

        <property name="maxIdle" value="${maxIdle}"></property>

        <!-- 连接池最小空闲 -->

        <property name="minIdle" value="${minIdle}"></property>

        <!-- 获取连接最大等待时间 -->

        <property name="maxWait" value="${maxWait}"></property>

    </bean>

    <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <property name="dataSource" ref="dataSource" />

        <!-- 自动扫描mapping.xml文件 -->

        <property name="mapperLocations" value="classpath*:com/aheizi/mapping/*.xml"></property>

        <property name="typeAliasesPackage" value="com.aheizi.domain" />

    </bean>

    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.aheizi.dao" />

        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>

    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->

    <bean id="transactionManager"

        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="dataSource" />

    </bean>

</beans>

但是在install的时候报了如下错误：

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.aheizi.dao.UserMapper.selectByUserId

	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:184)

	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38)

	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49)

	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42)

	at com.sun.proxy.$Proxy11.selectByUserId(Unknown Source)

	at com.aheizi.service.impl.UserServiceImpl.getUserById(UserServiceImpl.java:20)

	at com.aheizi.testmybatis.TestSpringDemo.test1(TestSpringDemo.java:37)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:601)

	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)

	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)

	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)

	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)

	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)

	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)

	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)

	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)

	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)

	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)

	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)

	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)

	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)

	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)

	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)

	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)

	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:601)

	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)

	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)

	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)

	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)

	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)

显示绑定错误，分析可知应该是在UserMapper接口和SQL的隐射文件没有结合。

第一时间检查了mapper的namespace属性，确认没有错。

后来查看了target/classes/../mapping并不存在，也就是说mapper.xml文件并没有在编译的时候放进classes中。

那么接口当然绑定不了selectByUserId这个方法。

查资料得知，有两个解决办法：

1.在pom.xml中添加如下代码：

<resources>

    <resource>

        <directory>src/main/resources</directory>

        <includes>

            <include>**/*.properties</include>

            <include>**/*.xml</include>

        </includes>

        <filtering>true</filtering>

    </resource>

    <resource>

        <directory>src/main/java</directory>

        <includes>

            <include>**/*.xml</include>

        </includes>

        <filtering>true</filtering>

    </resource>

</resources>

添加完成后，install仍然报错，查看classes文件，xml文件已经存在，但是却出现了其他问题，jdbc驱动找不到了，唉，无力。

解决不了心里很不舒服啊，花了一下午，终于解决了，将上面的文件修改为：

<resources>

    <resource>

        <directory>src/main/resources</directory>

    </resource>

    <resource>

        <directory>src/main/java</directory>

        <includes>

            <include>**/*.xml</include>

        </includes>

        <filtering>true</filtering>

    </resource>

</resources>

意思是maven在编译的时候class文件夹下包含src/main/resources下的文件与src/main/java下的*.properties文件。

上面一个直接指定，会加载不了。

这样处理让我感觉有点别扭。

2.将mapper.xml映射文件放到resources文件夹下。

文件目录如下：

运行就不会报错了，但是我看着还是有点别扭，就是看着不爽，等以后想到好办法之后再换吧。

我就纳了个闷了，maven这样限制xml文件的位置，即没让我觉得美观，也没有感到实用。