SpringMVC+Mybatis 环境搭建手记（下）

前文地址：SpringMVC+Mybatis 环境搭建手记（一）

三. Spring+SpringMVC整合Mybatis

接上文，SSM框架比较难处理的就是Spring的注解一系列配置，要使用Spring的依赖注入，需要在web.xml中添加对容器的配置

1.在web.xml中配置Spring容器

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/applicationContext*.xml</param-value>
</context-param>

配置加载在src/config下所有以applicationContext开头的配置文件。

2.配置applicationContext-dao.xml文件

在src/config下创建applicationContext-dao.xml，用于配置Spring事务和Mybatis属性

数据源配置，使用DBCP数据库连接池

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/localhost?useEncode=true;characterEncoding=utf-8"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>

配置加载Mybatis，定义加载Mybatis的SqlSessionFactoryBean类，并指定配置文件位置。由于事务管理已经移交到Spring中处理，所以Mybatis配置文件中只配置了别名属性，具体的xml代码会在文末附上。

配置Spring事务处理

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" >
<!-- 这里加载Mybatis的配置文件 -->
<property name="configLocation" value="classpath:config.xml" />
<property name="dataSource" ref="dataSource" />
</bean>

配置Mapper扫描器

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 扫描包路径，如果需要扫描多个包中间用半角逗号隔开 -->
<property name="basePackage" value="com.proj"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>

Mapper扫描器会扫描com.proj下所有以mapper结尾的文件。

这里特别需要注意的是，如果在mapper包下包含实现类的话，实现类会影响到扫描包，然后导致注解失败。

附上全部的xml文件：

1.web.xml

<?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/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>springMVC</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<!-- 配置前端控制器 -->
<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:config/spring.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>

<!--   加载spring容器 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/applicationContext*.xml</param-value>
</context-param>

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

<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener >

<!-- 字符编码过滤器 -->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

mybati 配置文件config.xml

<?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>
<!-- 启用下划线转化为驼峰 -->
<settings>
<setting name="mapUnderscoreToCamelCase" value="true" />
</settings>
<!-- 自动扫描bean文件配置类名为别名 -->
<typeAliases>
<package name="com.proj.bean"/>
</typeAliases>
</configuration>

Spring配置文件 spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
">

<!-- 注解配置 -->
<tx:annotation-driven />
<context:annotation-config />
<context:component-scan base-package="com.proj" />

<!-- 配置注解的处理器映射器和处理器适配器 -->
<mvc:annotation-driven />

<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 使用前缀和后缀 -->
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>

applicationContext配置文件applicationContext-dao.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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jee="http://www.springframework.org/schema/jee"
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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> 
<!-- 配置数据源   dbcp数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/zzq?useEncode=true;characterEncoding=utf-8"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>

<!-- 配置Mybatis属性 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" >
<!-- 这里加载Mybatis的配置文件 -->
<property name="configLocation" value="classpath:config.xml" />
<property name="dataSource" ref="dataSource" />
</bean>

<!-- 事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>

<!-- 配置mapper扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 扫描包路径，如果需要扫描多个包中间用半角逗号隔开 -->
<property name="basePackage" value="com.proj"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
</beans>