除了可以使用注解的方式配置事务，我们还可以通过XML文件来配置事务。

事前准备

创建接口

public interface BookShopDAO {
    public int findBookPriceByISBN(int ISBN);
    public void updateBookStock(int ISBN);
    public void updateUserAccount(String username, int price);
}

public interface BookShopService {
    public void purchase(String username, int ISBN);
}

public interface Cashier {
    public void checkout(String username, List<Integer> isbns);
}

实现类

public class BookShopDAOImpl implements BookShopDAO {
    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    @Override
    public int findBookPriceByISBN(int ISBN) {
        String sql = "select price from book where isbn = ? ";
        return jdbcTemplate.queryForObject(sql, Integer.class, ISBN);
    }

    @Override
    public void updateBookStock(int ISBN) {
        String sql = "update book_stock set stock = stock - 1 where isbn = ? ";
        jdbcTemplate.update(sql, ISBN);
    }

    @Override
    public void updateUserAccount(String username, int price) {
        String sql = "update account set balance = balance - ? where username = ? ";
        jdbcTemplate.update(sql, price, username);
    }
}

public class BookShopServiceImpl implements BookShopService {
    private BookShopDAO bookShopDAO;

    public void setBookShopDAO(BookShopDAO bookShopDAO) {
        this.bookShopDAO = bookShopDAO;
    }

    @Override
    public void purchase(String username, int ISBN) {
        int price = bookShopDAO.findBookPriceByISBN(ISBN);
        bookShopDAO.updateBookStock(ISBN);
        bookShopDAO.updateUserAccount("AA", price);
    }
}

public class CashierImpl implements Cashier {
    private BookShopService bookShopService;

    public void setBookShopService(BookShopService bookShopService) {
        this.bookShopService = bookShopService;
    }

    @Override
    public void checkout(String username, List<Integer> isbns) {
        for(Integer isbn: isbns){
            bookShopService.purchase(username, isbn);
        }
    }
}

配置文件

首先在Spring的配置为文件中配置事务管理需要用到的类

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

<bean id="bookShopDAO" class="com.spring.xml.BookShopDAOImpl">
    <property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>

<bean id="bookShopService" class="com.spring.xml.BookShopServiceImpl">
    <property name="bookShopDAO" ref="bookShopDAO"></property>
</bean>

<bean id="cashier" class="com.spring.xml.CashierImpl">
    <property name="bookShopService" ref="bookShopService"></property>
</bean>

配置事务管理器

<bean id="dataSourceTransactionManager"
      class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>

配置事务属性

<tx:advice id="txAdvice" transaction-manager="dataSourceTransactionManager">
    <tx:attributes>
        <tx:method name="*"/>
    </tx:attributes>
</tx:advice>

配置事务切入点，以及把事务切入点和事务属性关联起来

<aop:config>
    <aop:pointcut id="txPointCut" expression="execution(* com.spring.xml.BookShopDAO.*(..))"/>
    <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>

最后是测试类

public class TransactionTest {
    private ApplicationContext ctx = null;
    private Cashier cashier = null;

    {
        ctx = new ClassPathXmlApplicationContext("application-context-tx.xml");
        cashier = ctx.getBean(Cashier.class);
    }

    @Test
    public void test(){
        cashier.checkout("AA", Arrays.asList(1001));
    }
}