spring整合mybatis的简单配置

使用mapper接口的方式整合mybatis

1：创建UserMapper.java的接口

2：在资源文件中创建UserMapper.xml对应上面接口的映射文件，（文件名要和接口名相同）

3：在配置文件SqlMapConfig.xml中引用UserMapper.xml

4:配置applicationContext的文件

5：web.xml中加载applicationContext文件

web.xml中的配置：

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
<display-name>Archetype Created Web Application</display-name>

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/application*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>mvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/mvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc</servlet-name>
&
4000
lt;url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

</web-app>

applicationContext-dao.xml的配置：

<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 ">

<context:property-placeholder location="classpath:db.properties" />

<!-- 閰嶇疆鏁版嵁婧�-->
<!--<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">-->
<!--<property name="driverClass" value="${db.driver}" />-->
<!--<property name="jdbcUrl" value="${db.url}" />-->
<!--<property name="user" value="${db.username}" />-->
<!--<property name="password" value="${db.password}" />-->
<!--<property name="maxPoolSize" value="10" />-->
<!--<property name="minPoolSize" value="5" />-->
<!--</bean>-->

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis" />
<property name="username" value="root" />
<property name="password" value="root" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="5" />
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:config/SqlMapConfig.xml"/>
<property name="dataSource" ref="dataSource"></property>
</bean>

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.feitian.web.mapper"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
</beans>

applicationContext-service.xml的配置

<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 ">

<!-- 閰嶇疆service鐨刡ean锛屼娇鐢ㄦ壂鎻忓櫒 -->
<context:component-scan base-package="com.taotao.web"></context:component-scan>

<!-- 閰嶇疆浜嬪姟绠＄悊鍣�-->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 鏁版嵁婧�-->
<property name="dataSource" ref="dataSource"></property>
</bean>

<!-- 閰嶇疆閫氱煡 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 閰嶇疆浜嬪姟鐨勪紶鎾壒鎬�-->
<tx:method name="save*" propagation="REQUIRED" />
<tx:method name="add*" propagation="REQUIRED" />
<tx:method name="insert*" propagation="REQUIRED" />
<tx:method name="delete*" propagation="REQUIRED" />
<tx:method name="del*" propagation="REQUIRED" />
<tx:method name="remove*" propagation="REQUIRED" />
<tx:method name="update*" propagation="REQUIRED" />
<tx:method name="modify*" propagation="REQUIRED" />
<tx:method name="find*" read-only="true" />
<tx:method name="query*" read-only="true" />
<tx:method name="select*" read-only="true" />
<tx:method name="get*" read-only="true" />
</tx:attributes>
</tx:advice>

<!-- 閰嶇疆aop -->
<aop:config>
<aop:advisor advice-ref="txAdvice"
pointcut="execution(* com.feitian.web.service.*.*(..))" />
</aop:config>
</beans>

SqlMapConfig.xml配置：

<?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>
<typeAliases>
<typeAlias type="com.feitian.web.po.User" alias="User"/>
</typeAliases>
<mappers>
<mapper resource="config/sqlMap/UserMapper.xml"/>
</mappers>

</configuration>

UserMapper.xml配置：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.feitian.web.mapper.UserMapper">
<select id="findUserById" parameterType="int" resultType="java.lang.String">
SELECT
username FROM tb_user WHERE id = #{id}
</select>
</mapper>

UserMapper.java接口：

package com.feitian.web.mapper;
public interface UserMapper {
String findUserById( int id);
}

mvc_servlet.xml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: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.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> 
<!-- 注解驱动 -->
<mvc:annotation-driven />

<context:component-scan base-package="com.feitian.web.controller" />

<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>

以上配置可以正确运行

在配置过程中出现了下面的错误：

Mapped Statements collection does not contain value for com.feitianweb.mappe

经排查是userMapper.xml配置文件没有找到，除此之外还有几个注意点也会引起上面的错误：

1、mapper.xml中没有加入namespace 
2、mapper.xml中的方法和接口mapper的方法不对应 
3、mapper.xml没有加入到SqlMapConfig.xml中(即总的配置文件)，例外：配置了mapper文件的包路径的除外 
(或者：由于包的层级太多，跟SqlMapConfig.xml配置的内容不一致，导致无法识别)
4、mapper.xml文件名和所写的mapper名称不相同。