内部bean 对象结构：

@Autowired
private  IAccountService accountService;

@Service("accountService")
@Transactional(propagation= Propagation.SUPPORTS,readOnly=true)//只读型事务的配置
public class AccountServiceImpl implements IAccountService{

    @Autowired
    private IAccountDao accountDao;

@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

在bean.xml文件中有

<!-- 配置spring创建容器时要扫描的包-->
<context:component-scan base-package="com.itheima"></context:component-scan>

<!-- 配置JdbcTemplate-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"></property>
</bean>



<!-- 配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    <property name="url" value="jdbc:mysql://localhost:3306/eesy"></property>
    <property name="username" value="root"></property>
    <property name="password" value="1234"></property>
</bean>

<!-- spring中基于注解 的声明式事务控制配置步骤
    1、配置事务管理器
    2、开启spring对注解事务的支持
    3、在需要事务支持的地方使用@Transactional注解


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



<!-- 开启spring对注解事务的支持-->
<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

 

持久层实现类

 

@Override
public Account findAccountByName(String accountName) {
    List<Account> accounts = jdbcTemplate.query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
    if(accounts.isEmpty()){
        return null;
    }
    if(accounts.size()>1){
        throw new RuntimeException("结果集不唯一");
    }
    return accounts.get(0);
}

业务层实现类

//需要的是读写型事务配置
@Transactional(propagation= Propagation.REQUIRED,readOnly=false)//可以读写
@Override
public void transfer(String sourceName, String targetName, Float money) {
    System.out.println("transfer....");
        //2.1根据名称查询转出账户
        Account source = accountDao.findAccountByName(sourceName);
        //2.2根据名称查询转入账户
        Account target = accountDao.findAccountByName(targetName);
        //2.3转出账户减钱
        source.setMoney(source.getMoney()-money);
        //2.4转入账户加钱
        target.setMoney(target.getMoney()+money);
        //2.5更新转出账户
        accountDao.updateAccount(source);

        int i=1/0;//异常源 byzero

        //2.6更新转入账户
        accountDao.updateAccount(target);
}

junit单元测试

@Test
public  void testTransfer(){

    accountService.transfer("aaa","bbb",100f);

}