Spring入门第三十课

Posted 2020-09-20 alittlecomputer

基于XML的方式配置事务

直接看代码：

package logan.study.spring.tx.xml;

public interface BookShopDao {
    //根据书号获取书的单价
    public int findBookPriceIsbn(String isbn);
    
    //更新书的库存，使书号对应的库存-1
    public void updateBookStock(String isbn);
    
    
    public void updateUserAccount(String username,int price);

}

package logan.study.spring.tx.xml;

import org.springframework.jdbc.core.JdbcTemplate;

public class BookShopDaoImpl implements BookShopDao {
    
    
    private JdbcTemplate jdbcTemplate;
    
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    @Override
    public int findBookPriceIsbn(String isbn) {
        // TODO Auto-generated method stub
        String sql = "SELECT price FROM book WHERE isbn=?";
        return jdbcTemplate.queryForObject(sql, Integer.class, isbn);
    }

    @Override
    public void updateBookStock(String isbn) {
        // TODO Auto-generated method stub
        //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 = ?";
        int stock = jdbcTemplate.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 = ?";
        jdbcTemplate.update(sql, isbn);

    }

    @Override
    public void updateUserAccount(String username, int price) {
        // TODO Auto-generated method stub
        //检查书的库存是否足够，若不够，则抛出异常
        String sql2 = "SELECT balance FROM account WHERE username = ?";
        int balance = jdbcTemplate.queryForObject(sql2, Integer.class, username);
        if(balance < price){
            throw new UserAccountException("余额不足！");
        }
        String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
        jdbcTemplate.update(sql, price, username);

    }

}

package logan.study.spring.tx.xml;

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

}

package logan.study.spring.tx.xml;



public class BookShopServiceImpl implements BookShopService {
    
    
    private BookShopDao bookShopDao;

    
    public void setBookShopDao(BookShopDao bookShopDao) {
        this.bookShopDao = bookShopDao;
    }
    
    @Override
    public void purchase(String username, String isbn) {
        // TODO Auto-generated method stub
        //1.获取书的单价
        int price = bookShopDao.findBookPriceIsbn(isbn);
        //2.更新书的库存
        bookShopDao.updateBookStock(isbn);
        //3.更新用户余额
        bookShopDao.updateUserAccount(username, price);
        

    }

}

package logan.study.spring.tx.xml;

public class BookStockException extends RuntimeException{

    public BookStockException() {
        super();
        // TODO Auto-generated constructor stub
    }

    public BookStockException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
        // TODO Auto-generated constructor stub
    }

    public BookStockException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public BookStockException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

    public BookStockException(Throwable cause) {
        super(cause);
        // TODO Auto-generated constructor stub
    }
    
    

}

package logan.study.spring.tx.xml;

import java.util.List;

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

}

package logan.study.spring.tx.xml;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

public class CashierImpl implements Cashier{
    
    
    private BookShopService bookShopService;
    
    public void setBookShopService(BookShopService bookShopService) {
        this.bookShopService = bookShopService;
    }

    @Override
    public void checkout(String username, List<String> isbns) {
        // TODO Auto-generated method stub
        for(String isbn:isbns){
            bookShopService.purchase(username, isbn);
        }
        
    }

}

package logan.study.spring.tx.xml;

import static org.junit.Assert.*;

import java.util.Arrays;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

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

}

package logan.study.spring.tx.xml;

public class UserAccountException extends RuntimeException{

    public UserAccountException() {
        super();
        // TODO Auto-generated constructor stub
    }

    public UserAccountException(String message, Throwable cause, boolean enableSuppression,
            boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
        // TODO Auto-generated constructor stub
    }

    public UserAccountException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public UserAccountException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

    public UserAccountException(Throwable cause) {
        super(cause);
        // TODO Auto-generated constructor stub
    }
    
    

}

<?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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop"
    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-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

    <context:component-scan base-package="logan.study.spring.tx"></context:component-scan>

    <!-- 导入资源文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 配置C3P0数据源 -->
    <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="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        
        <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
    </bean>
    
    <!-- 配置Spring的JDBCTemplate -->
    <bean id="jdbcTemplate"
    class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!-- 配置bean -->
    <bean id="bookShopDao" class="logan.study.spring.tx.xml.BookShopDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>
    
    <bean id="bookShopService" class="logan.study.spring.tx.xml.BookShopServiceImpl">
        <property name="bookShopDao" ref="bookShopDao"></property>
    </bean>
    
    <bean id="cashier" class="logan.study.spring.tx.xml.CashierImpl">
        <property name="bookShopService" ref="bookShopService"></property>
    </bean>
    
    <!-- 配置事务管理器 -->
    <bean id="transactionManager" 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="transactionManager">
        <tx:attributes>
            <!-- 根据方法名指定事务的属性 -->
            <tx:method name="purchase" propagation="REQUIRES_NEW"/>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="find*" read-only="true"/>
            <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 expression="execution(* logan.study.spring.tx.xml.BookShopService.*(..) )" 
        id="txPointCut"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
</beans>

db.properties

jdbc.user=root
jdbc.password=logan123
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring

jdbc.initPoolSize=5
jdbc.maxPoolSize=10