Spring 教程05

spring-5
1.    Xml


<!-- \src\applicationContext.xml -->
<?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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    
    <!-- 配置自动扫描的包 -->
    <context:component-scan base-package="com.atguigu.spring.hibernate"></context:component-scan>
    
    <!-- 配置数据源 -->
    <!-- 导入资源文件 -->
    <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>
    
    <!-- 配置 Hibernate 的 SessionFactory 实例: 通过 Spring 提供的 LocalSessionFactoryBean 进行配置 -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <!-- 配置数据源属性 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置 hibernate 配置文件的位置及名称 -->
        <!--  
        <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
        -->
        <!-- 使用 hibernateProperties 属相来配置 Hibernate 原生的属性 -->
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
        <!-- 配置 hibernate 映射文件的位置及名称, 可以使用通配符 -->
        <property name="mappingLocations" 
            value="classpath:com/atguigu/spring/hibernate/entities/*.hbm.xml"></property>
    </bean>

    <!-- 配置 Spring 的声明式事务 -->
    <!-- 1. 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>

    <!-- 2. 配置事务属性, 需要事务管理器 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="purchase" propagation="REQUIRES_NEW"/>
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>

    <!-- 3. 配置事务切点, 并把切点和事务属性关联起来 -->
    <aop:config>
        <aop:pointcut expression="execution(* com.atguigu.spring.hibernate.service.*.*(..))" 
            id="txPointcut"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    </aop:config>

</beans>

<!-- \src\com\atguigu\spring\hibernate\entities\Account.hbm.xml -->
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.atguigu.spring.hibernate.entities.Account" table="SH_ACCOUNT">
        
        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="native" />
        </id>
        
        <property name="username" type="java.lang.String">
            <column name="USERNAME" />
        </property>
        
        <property name="balance" type="int">
            <column name="BALANCE" />
        </property>
        
    </class>
</hibernate-mapping>

<!-- \src\com\atguigu\spring\hibernate\entities\Book.hbm.xml -->
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.atguigu.spring.hibernate.entities.Book" table="SH_BOOK">
    
        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="native" />
        </id>
        
        <property name="bookName" type="java.lang.String">
            <column name="BOOK_NAME" />
        </property>
        
        <property name="isbn" type="java.lang.String">
            <column name="ISBN" />
        </property>
        
        <property name="price" type="int">
            <column name="PRICE" />
        </property>
        
        <property name="stock" type="int">
            <column name="STOCK" />
        </property>
        
    </class>
</hibernate-mapping>

<!-- \src\hibernate.cfg.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
    
        <!-- 配置 hibernate 的基本属性 -->
        <!-- 1. 数据源需配置到 IOC 容器中, 所以在此处不再需要配置数据源 -->
        <!-- 2. 关联的 .hbm.xml 也在 IOC 容器配置 SessionFactory 实例时在进行配置 -->
        <!-- 3. 配置 hibernate 的基本属性: 方言, SQL 显示及格式化, 生成数据表的策略以及二级缓存等. -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>

        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>
        
        <property name="hibernate.hbm2ddl.auto">update</property>
        
        <!-- 配置 hibernate 二级缓存相关的属性. -->
                
    </session-factory>
</hibernate-configuration>

2.    Properties


# \src\db.properties
jdbc.user=root
jdbc.password=1230
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///spring7

jdbc.initPoolSize=5
jdbc.maxPoolSize=10
#...

3.    Java


// \src\com\atguigu\spring\hibernate\dao\BookShopDao.java
package com.atguigu.spring.hibernate.dao;

public interface BookShopDao {

    //根据书号获取书的单价
    public int findBookPriceByIsbn(String isbn);
    
    //更新数的库存. 使书号对应的库存 - 1
    public void updateBookStock(String isbn);
    
    //更新用户的账户余额: 使 username 的 balance - price
    public void updateUserAccount(String username, int price);
}

// \src\com\atguigu\spring\hibernate\dao\impl\BookShopDaoImpl.java
package com.atguigu.spring.hibernate.dao.impl;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.atguigu.spring.hibernate.dao.BookShopDao;
import com.atguigu.spring.hibernate.exceptions.BookStockException;
import com.atguigu.spring.hibernate.exceptions.UserAccountException;

@Repository
public class BookShopDaoImpl implements BookShopDao {
    
    @Autowired
    private SessionFactory sessionFactory;
    
    //不推荐使用 HibernateTemplate 和 HibernateDaoSupport
    //因为这样会导致 Dao 和 Spring 的 API 进行耦合
    //可以移植性变差
//  private HibernateTemplate hibernateTemplate;
    
    //获取和当前线程绑定的 Session. 
    private Session getSession(){
        return sessionFactory.getCurrentSession();
    }

    @Override
    public int findBookPriceByIsbn(String isbn) {
        String hql = "SELECT b.price FROM Book b WHERE b.isbn = ?";
        Query query = getSession().createQuery(hql).setString(0, isbn);
        return (Integer)query.uniqueResult();
    }

    @Override
    public void updateBookStock(String isbn) {
        //验证书的库存是否充足. 
        String hql2 = "SELECT b.stock FROM Book b WHERE b.isbn = ?";
        int stock = (int) getSession().createQuery(hql2).setString(0, isbn).uniqueResult();
        if(stock == 0){
            throw new BookStockException("库存不足!");
        }
        
        String hql = "UPDATE Book b SET b.stock = b.stock - 1 WHERE b.isbn = ?";
        getSession().createQuery(hql).setString(0, isbn).executeUpdate();
    }

    @Override
    public void updateUserAccount(String username, int price) {
        //验证余额是否足够
        String hql2 = "SELECT a.balance FROM Account a WHERE a.username = ?";
        int balance = (int) getSession().createQuery(hql2).setString(0, username).uniqueResult();
        if(balance < price){
            throw new UserAccountException("余额不足!");
        }
        
        String hql = "UPDATE Account a SET a.balance = a.balance - ? WHERE a.username = ?";
        getSession().createQuery(hql).setInteger(0, price).setString(1, username).executeUpdate();
    }

}

// \src\com\atguigu\spring\hibernate\entities\Account.java
package com.atguigu.spring.hibernate.entities;

public class Account {

    private Integer id;
    private String username;
    private int balance;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public int getBalance() {
        return balance;
    }

    public void setBalance(int balance) {
        this.balance = balance;
    }

}

// \src\com\atguigu\spring\hibernate\entities\Book.java
package com.atguigu.spring.hibernate.entities;

public class Book {

    private Integer id;
    private String bookName;
    private String isbn;
    private int price;
    private int stock;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getIsbn() {
        return isbn;
    }

    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

}

// \src\com\atguigu\spring\hibernate\exceptions\BookStockException.java
package com.atguigu.spring.hibernate.exceptions;

public class BookStockException extends RuntimeException{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    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
    }

    
}

// \src\com\atguigu\spring\hibernate\exceptions\UserAccountException.java
package com.atguigu.spring.hibernate.exceptions;

public class UserAccountException extends RuntimeException{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    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
    }

    
    
}

// \src\com\atguigu\spring\hibernate\service\BookShopService.java
package com.atguigu.spring.hibernate.service;

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

// \src\com\atguigu\spring\hibernate\service\Cashier.java
package com.atguigu.spring.hibernate.service;

import java.util.List;

public interface Cashier {

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

// \src\com\atguigu\spring\hibernate\service\impl\BookShopServiceImpl.java
package com.atguigu.spring.hibernate.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.atguigu.spring.hibernate.dao.BookShopDao;
import com.atguigu.spring.hibernate.service.BookShopService;

@Service
public class BookShopServiceImpl implements BookShopService {

    @Autowired
    private BookShopDao bookShopDao;
    
    /**
     * Spring hibernate 事务的流程
     * 1. 在方法开始之前
     * ①. 获取 Session
     * ②. 把 Session 和当前线程绑定, 这样就可以在 Dao 中使用 SessionFactory 的
     * getCurrentSession() 方法来获取 Session 了
     * ③. 开启事务
     * 
     * 2. 若方法正常结束, 即没有出现异常, 则
     * ①. 提交事务
     * ②. 使和当前线程绑定的 Session 解除绑定
     * ③. 关闭 Session
     * 
     * 3. 若方法出现异常, 则:
     * ①. 回滚事务
     * ②. 使和当前线程绑定的 Session 解除绑定
     * ③. 关闭 Session
     */
    @Override
    public void purchase(String username, String isbn) {
        int price = bookShopDao.findBookPriceByIsbn(isbn);
        bookShopDao.updateBookStock(isbn);
        bookShopDao.updateUserAccount(username, price);
    }

}

// \src\com\atguigu\spring\hibernate\service\impl\CashierImpl.java
package com.atguigu.spring.hibernate.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.atguigu.spring.hibernate.service.BookShopService;
import com.atguigu.spring.hibernate.service.Cashier;

@Service
public class CashierImpl implements Cashier{
    
    @Autowired
    private BookShopService bookShopService;
    
    @Override
    public void checkout(String username, List<String> isbns) {
        for(String isbn:isbns){
            bookShopService.purchase(username, isbn);
        }
    }

}

// \src\com\atguigu\spring\hibernate\test\SpringHibernateTest.java
package com.atguigu.spring.hibernate.test;

import java.sql.SQLException;
import java.util.Arrays;

import javax.sql.DataSource;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.atguigu.spring.hibernate.service.BookShopService;
import com.atguigu.spring.hibernate.service.Cashier;

public class SpringHibernateTest {

    private ApplicationContext ctx = null;
    private BookShopService bookShopService = null;
    private Cashier cashier = null;
    
    {
        ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        bookShopService = ctx.getBean(BookShopService.class);
        cashier = ctx.getBean(Cashier.class);
    }
    
    @Test
    public void testCashier(){
        cashier.checkout("aa", Arrays.asList("1001","1002"));
    }
    
    @Test
    public void testBookShopService(){
        bookShopService.purchase("aa", "1001");
    }
    
    @Test
    public void testDataSource() throws SQLException {
        DataSource dataSource = ctx.getBean(DataSource.class);
        System.out.println(dataSource.getConnection());
    }

}