什么是Spring?
Spring是分层的javaEE full-stack(一站式)轻量级开源框架。
---注解配置--针对SSM
<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" 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/aop http://www.springframework.org/schema/aop/spring-aop-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/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd"> <!-- 导入外部资源文件FALLBACK 默认值,不存在时覆盖
NEVER 不覆盖 OVERRIDE 覆盖 --> <context:property-placeholder location="classpath:db.properties" system-properties-mode="FALLBACK"/><!--
注解配置扫描 --> <!-- 扫描 service dao --> <context:component-scan base-package="com.hp"></context:component-scan> <!-- <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">--> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <!-- 数据库连接的四要素 --> <property name="driverClassName" value="${jdbc.driverClass}"></property> <property name="url" value="${jdbc.jdbcUrl}"></property> <property name="username" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!-- 注册事务管理器 --> <bean id="txMgr" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean><!-- 开启事务注解驱动 -->
<tx:annotation-driven transaction-manager="txMgr" /><!-- 配置mybatis的sqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"></property> <property name="configLocation" value="classpath:mybatis-config.xml"></property> </bean><!-- 配置可以整体扫描Mapper的一个扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.hp.bookstore.mapper"></property> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> </bean></beans>
db.properties数据库连接文件内容:
jdbc.user=xxx
jdbc.password=xxxjdbc.driverClass=com.mysql.jdbc.Driverjdbc.jdbcUrl=jdbc:mysql://localhost:3306/xxx?useSSL=true