springMVC + mybaits

工程结构

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.test.spring</groupId>
    <artifactId>springmvc_mybatis</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>springmvc_mybatis Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <properties>
        <org.springframework.version>4.1.6.RELEASE</org.springframework.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- spring jar包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <!-- mybatis start -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.8</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
        </dependency>
        <!--mybatis end -->

        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
        <!-- commons  -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.2.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- jackson -->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.12</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.12</version>
        </dependency>

        <!-- servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>

        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- servlet end -->

        <!-- 日志 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>

        <!-- spring aop切面使用时用到的包 -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.12</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.6.12</version>
        </dependency>
        <!-- spring aop切面 -->

        <!-- 开启懒加载时用到 -->
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>3.2.3</version>
        </dependency>
        <dependency>
            <groupId>ant</groupId>
            <artifactId>ant</artifactId>
            <version>1.7.0</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>springmvc_mybatis</finalName>
    </build>
</project>

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_2_5.xsd"
	version="2.5">

	<!--1：初始化过程： 在启动Web项目时，容器(比如Tomcat)会读web.xml配置文件中的两个节点<listener>和<contex-param>。 
	
		2：接着容器会创建一个ServletContext(上下文),应用范围内即整个WEB项目都能使用这个上下文。
		
		3： 接着容器会将读取到<context-param>转化为键值对,并交给ServletContext。 
		
	 	4：容器创建<listener></listener>中的类实例,即创建监听（备注：listener定义的类可以是自定义的类但必须需要继承ServletContextListener）。 
		
		5：在监听的类中会有一个contextInitialized(ServletContextEvent event)初始化方法，在这个方法中可以通过event.getServletContext().getInitParameter("contextConfigLocation") 
		来得到context-param 设定的值。在这个类中还必须有一个contextDestroyed(ServletContextEvent event) 
		销毁方法用于关闭应用前释放资源，比如说数据库连接的关闭。 
			
		6：得到这个context-param的值之后,你就可以做一些操作了。注意：这个时候你的WEB项目还没有完全启动完成，这个动作会比所有的Servlet都要早。
		
		web.xml的加载过程是context-param  >> listener  >> fileter  >> servlet
		 -->
		
		
	<!-- 用来声明应用范围(整个WEB项目)内的上下文初始化参数。 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring/springmvc.xml,classpath:spring/applicationContext-*.xml</param-value>
	</context-param>
	
	<!-- 声明日志文件的初始化参数 -->
	<context-param>
		<param-name>log4jConfigLocation</param-name>
		<param-value>classpath:log4j.properties</param-value>
	</context-param>
	<!-- ContextLoaderListener初始化的上下文加载的Bean是对于整个应用程序共享的，DAO层、Service层Bean -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- DispatcherServlet初始化的上下文加载的Bean是只对Spring Web MVC有效的Bean
		如Controller、HandlerMapping、HandlerAdapter等等，该初始化上下文应该只加载Web相关组件。 -->
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- servlet 范围内的参数，只有在servlet的init()方法中取得 -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value></param-value>
		</init-param>
		
		<!-- 如果是这种配置，必须在<context:component-scan>中只扫描controller包
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring/springmvc.xml</param-value>
		</init-param>
		-->
		<!-- 
			在servlet的配置当中，<load-on-startup>1</load-on-startup>的含义是： 
			
			标记容器是否在启动的时候就加载这个servlet。 
			
			当值为0或者大于0时，表示容器在应用启动时就加载这个servlet； 
			
			当是一个负数时或者没有指定时，则指示容器在该servlet被选择时才加载。 
			
			正数的值越小，启动该servlet的优先级越高。 
		 -->
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>springmvc</servlet-name>
		<url-pattern>*.html</url-pattern>
	</servlet-mapping>

	<filter>
		<display-name>encodingFilter</display-name>
		<filter-name>encodingFilter</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>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
	</welcome-file-list>
</web-app>

springmvc.xml

<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:component-scan base-package="com.study.sm">
	</context:component-scan>
	<mvc:annotation-driven></mvc:annotation-driven>

	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<!-- 配置jsp路径的前缀 -->
		<property name="prefix" value="/WEB-INF/pages/" />
		<!-- 配置jsp路径的后缀 -->
		<property name="suffix" value=".jsp" />
	</bean>
</beans>

applicationContext-dao.xml

<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"/>
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="maxActive" value="100"></property>
		<property name="maxIdle" value="30"></property>
		<property name="maxWait" value="500"></property>
		<property name="defaultAutoCommit" value="true"></property>
		<property name="validationQuery" value="SELECT 1" />
		<property name="testOnBorrow" value="false"/>
		<property name="testWhileIdle" value="true"/>
		<property name="timeBetweenEvictionRunsMillis" value="30000" />
		<property name="minEvictableIdleTimeMillis" value="1800000" />
		<property name="numTestsPerEvictionRun" value="10" />
	</bean>
	
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="configLocation" value="classpath:mybatis/sqlMapConfig.xml"></property>
	</bean>
	
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.study.sm.mapper"></property>
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
	</bean>

</beans>

applicationContext-transaction.xml

<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:component-scan base-package="com.study.sm.mapper,com.study.sm.service.impl">
	</context:component-scan> -->

	<!-- 事务管理器 对mybatis操作数据库事务控制，spring使用jdbc的事务控制类 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 数据源 dataSource在applicationContext-dao.xml中配置了 -->
		<property name="dataSource" ref="dataSource" />
	</bean>

	<!-- 通知 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<!-- 传播行为 -->
			<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="add*" propagation="REQUIRED" />
			<tx:method name="find*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="get*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="select*" propagation="SUPPORTS" read-only="true" />
		</tx:attributes>
	</tx:advice>
	<!-- aop -->
	<aop:config>
		<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.study.sm.service.impl.*.*(..))"/>
	</aop:config>

</beans>

　　

 

如果web.xml是这种配置其他文件不变，则在com.study.sm.service.impl中的带有@Transactional事务控制的方法事务不起作用；原因是web.xml的加载过程是context-param  >> listener  >> fileter  >> servlet

servlet中的组件加载会覆盖contextConfigLocation先加载的，因为配置的扫描是<context:component-scan base-package="com.study.sm"></context:component-scan>，扫描的是全部所以会覆盖。

如果想要起作用则在springmvc.xml中只扫描<context:component-scan base-package="com.study.sm.controller">controller包，在applicationContext-transaction.xml中添加扫描其他包

<context:component-scan base-package="com.study.sm.mapper,com.study.sm.service.impl"> </context:component-scan>

<!-- 用来声明应用范围(整个WEB项目)内的上下文初始化参数。 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring/applicationContext-*.xml</param-value>
	</context-param>
	
	<!-- 声明日志文件的初始化参数 -->
	<context-param>
		<param-name>log4jConfigLocation</param-name>
		<param-value>classpath:log4j.properties</param-value>
	</context-param>
	<!-- ContextLoaderListener初始化的上下文加载的Bean是对于整个应用程序共享的，DAO层、Service层Bean -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- DispatcherServlet初始化的上下文加载的Bean是只对Spring Web MVC有效的Bean
		如Controller、HandlerMapping、HandlerAdapter等等，该初始化上下文应该只加载Web相关组件。 -->
	<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>
		<load-on-startup>1</load-on-startup>
	</servlet>