Spring（5.1、基于xml的事物）

逃离我推掉我的手 2022-06-08 07:22 134阅读 0赞

## Spring配置式事物(基于xml)    ##

文件目录结构

![20170611114620859][]

java类

public interface BookShopDao {
    	public int findBookPriceByIsbn(String isbn);
    	public void updateBookStock(String isbn);
    	public void updateUserAccount(String username, int price);
    }

public class BookShopDaoImpl implements BookShopDao {
    	private JdbcTemplate jt;
    	public void setJt(JdbcTemplate jt) {
    		this.jt = jt;
    	}
    	public int findBookPriceByIsbn(String isbn) {
    		String sql = "SELECT price FROM book WHERE isbn=?";
    		return jt.queryForObject(sql, Integer.class, isbn);
    	}
    	public void updateBookStock(String isbn) {
    		// 检查书的库存是否足够，若不够，则抛出异常
    		String sql2 = "SELECT stock FROM book_stock WHERE isbn=?";
    		Integer stock = jt.queryForObject(sql2, Integer.class, isbn);
    		if (stock == 0) {
    			throw new BookStockException("库存不足!");
    		}
    		String sql = "UPDATE book_stock SET stock=stock-1 WHERE isbn=?";
    		int update = jt.update(sql, isbn);
    		System.out.println("更新了-->" + update + "条");
    	}
    	public void updateUserAccount(String username, int price) {
    		// 验证用户的余额是否足够
    		String banalce = "SELECT balance FROM account WHERE username=?";
    		int ba = jt.queryForObject(banalce, Integer.class, username);
    		if (ba > 0 && ba < price) {
    			throw new UserAccountException("账户余额不足!");
    		}
    		String sql = "UPDATE account SET balance=balance-? WHERE username=?";
    		int update = jt.update(sql, price, username);
    		System.out.println("更新了-->" + update + "条");
    	}
    }

public class BookStockException extends RuntimeException {
    ...//实现方法
    }

public class UserAccountException extends RuntimeException {
    …//实现方法
    }

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

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

public class BookShopServiceImpl implements BookShopService {
    	private BookShopDao bsd;
    	public void setBsd(BookShopDao bsd) {
    		this.bsd = bsd;
    	}
    	public void purchase(String username, String isbn) {
    		// 1获取书的单价
    		int price = bsd.findBookPriceByIsbn(isbn);
    		// 2更新数的库存
    		bsd.updateBookStock(isbn);
    		// 3更新用户的余额
    		bsd.updateUserAccount(username, price);
    	}
    }

public class CashierImpl implements Cashier {
    	private BookShopService bookShopService;
    	public void setBookShopService(BookShopService bookShopService) {
    		this.bookShopService = bookShopService;
    	}
    	public void checkout(String username, List<String> isbns) {
    		for (String isbn : isbns) {
    			bookShopService.purchase(username, isbn);
    		}
    	}
    }

**xml(核心)**

<context:component-scan base-package="com.spring.beans"></context:component-scan>
    	
    	<context:property-placeholder location="classpath:db.properties" />
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="user" value="${jdbc.user}"></property>
    		<property name="password" value="${jdbc.password}"></property>
    		<property name="driverClass" value="${jdbc.driverClass}"></property>
    		<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    		<property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
    		<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
    	</bean>
    	        
            
        
            <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    	<bean id="bookShopDao" class="com.spring.beans.tx.xml.BookShopDaoImpl">
    		<property name="jt" ref="jdbcTemplate"></property>
    	</bean>
    	<bean id="bookShopService"
    		class="com.spring.beans.tx.xml.service.impl.BookShopServiceImpl">
    		<property name="bsd" ref="bookShopDao"></property>
    	</bean>
    	<bean id="cashier" class="com.spring.beans.tx.xml.service.impl.CashierImpl">
    		<property name="bookShopService" ref="bookShopService"></property>
    	</bean>
    	
    	<bean id="transactionManager"
    		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    	
    	<tx:advice id="txAdvice" transaction-manager="transactionManager">
    		<tx:attributes>
    			
    			<tx:method name="purchase" propagation="REQUIRES_NEW" />
    			<tx:method name="get" read-only="true" />
    			<tx:method name="find" read-only="true" />
    		</tx:attributes>
    	</tx:advice>
    	
    	<aop:config>
    		<aop:pointcut expression="execution(* com.spring.beans.tx.xml.service.*.*(..))"
    			id="pointCut" />
    		<aop:advisor advice-ref="txAdvice" pointcut-ref="pointCut" />
    	</aop:config>

测试类

public class BookShopDaoImplTest {
    	private ApplicationContext ctx = null;
    	private BookShopService bookShopService = null;
    	private Cashier cashier = null;
    	{
    		ctx = new ClassPathXmlApplicationContext("applicationContext-xml.xml");
    		bookShopService = (BookShopService) ctx.getBean("bookShopService");
    		cashier = ctx.getBean(Cashier.class);
    	}
    	@Test
    	public void testcashier() {
    		cashier.checkout("AA", Arrays.asList("1001", "1002"));
    	}
    	@Test
    	public void testbookShopService() {
    		bookShopService.purchase("AA", "1001");
    	}
    }

[20170611114620859]: /images/20220608/9f2fa46e72994baba2e750ecdaa26983.png