ref和value的区别
ref即引用,
ref="dataSource"就是引用dataSource的bean
value直接设置一个值
ref,spring容器会在引用后进行验证,验证当前的xml是否存在引用的bean
value,spring会在 容器启动,实例化bean 时进行验证
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applicationContext-transaction.xml
<?xml version="1.0" encoding="utf-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<!-- 定义事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 定义事务策略 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!--所有以query开头的方法都是只读的 -->
<tx:method name="query*" read-only="true" />
<!--其他方法使用默认事务策略 -->
<tx:method name="*" />
</tx:attributes>
</tx:advice>
<aop:config>
<!--pointcut元素定义一个切入点,execution中的第一个星号 用以匹配方法的返回类型,
这里星号表明匹配所有返回类型。 com.abc.dao.*.*(..)表明匹配cn.itcast.mybatis.service包下的所有类的所有
方法 -->
<aop:pointcut id="myPointcut" expression="execution(* cn.itcast.mybatis.service.*.*(..))" />
<!--将定义好的事务处理策略应用到上述的切入点 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="myPointcut" />
</aop:config>
</beans>
applicationContext.xml
?xml version="1.0" encoding="utf-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<!-- 使用spring自带的占位符替换功能 -->
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<!-- 允许JVM参数覆盖 -->
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
<!-- 忽略没有找到的资源文件 -->
<property name="ignoreResourceNotFound" value="true" />
<!-- 配置资源文件 -->
<property name="locations">
<list>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean>
<!-- 开启注解扫描 -->
<context:component-scan base-package="cn.itcast.usermanage.service"/>
<!-- 配置数据源 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" 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}" />
</bean>
</beans>