项目管理与SSM框架 Spring5（五）

<!-- 事务管理 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-tx</artifactId>
  <version>5.3.13</version>
</dependency>
<!-- 事务底层 AspectJ -->
<dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjweaver</artifactId>
  <version>1.8.7</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       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.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context.xsd
     http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop.xsd
     http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!--扫描包-->
    <context:component-scan base-package="com.zj"/>
    <!--读取数据源配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--配置数据源-->
    <bean id="datasource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!--创建Spring封装过的SqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
    </bean>
    <!--创建Spring封装的SqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
    <!-- 该对象可以自动扫描持久层接口，并为接口创建代理对象 -->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 配置扫描的接口包 -->
        <property name="basePackage" value="com.zj.dao"/>
    </bean>
     <!--事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>
    <!--事务相关配置-->
    <tx:advice id="txAdvice">
        <!--暂时都用默认配置-->
        <tx:attributes>
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>
    <!--配置切面（切点+通知）-->
    <aop:config>
        <!--切点-->
        <aop:pointcut id="point" expression="execution(* com.zj.service.*(..))"/>
        <!--通知-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="point"/>
    </aop:config>
</beans>

<tx:advice id="txAdvice">
  <tx:attributes>
    <tx:method name="*"/>
    <tx:method name="find*" read-only="true"/>
  </tx:attributes>
</tx:advice>

// method1的所有方法在同一个事务中
public void method1(){
  // 此时会开启一个新事务，这就无法保证method1()中所有的代码是在同一个事务中
  method2();
  System.out.println("method1");
}
public void method2(){
  System.out.println("method2");
}

<!--事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>
    <!--注册事务注解驱动-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

@Service
@Transactional(propagation = Propagation.REQUIRED,isolation = Isolation.DEFAULT)
public class UserService {}

@Configuration
@ComponentScan("com.zj")
@EnableTransactionManagement
public class SpringConfig {
  @Bean
  public DataSource getDataSource(){
    DruidDataSource druidDataSource = new DruidDataSource();
    druidDataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
    druidDataSource.setUrl("jdbc:mysql:///mybatis");
    druidDataSource.setUsername("root");
    druidDataSource.setPassword("123456");
    return druidDataSource;
   }
  @Bean
  public SqlSessionFactoryBean getSqlSession(DataSource dataSource){
    SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
    sqlSessionFactoryBean.setDataSource(dataSource);
    return sqlSessionFactoryBean;
   }
  @Bean
  public MapperScannerConfigurer getMapperScanner(){
    MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
    mapperScannerConfigurer.setBasePackage("com.zj.dao");
    return mapperScannerConfigurer;
   }
  @Bean
  public DataSourceTransactionManager getTransactionManager(DataSource dataSource){
    DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
    dataSourceTransactionManager.setDataSource(dataSource);
    return dataSourceTransactionManager;
   }
}