Spring事务之详解--三种实现方式

实现购买股票案例:

一、引入JAR文件:

 


二、开始搭建分层架构---创建账户(Account)和股票(Stock)实体类

Account:

/*
 * 账户
 */
public class Account {

	private int aid;//账户编号
	private String aname;//账户名称
	private double balance;//账户金额
	
	
	public int getAid() {
		return aid;
	}
	public void setAid(int aid) {
		this.aid = aid;
	}
	public String getAname() {
		return aname;
	}
	public void setAname(String aname) {
		this.aname = aname;
	}
	public double getBalance() {
		return balance;
	}
	public void setBalance(double balance) {
		this.balance = balance;
	}

Stock:  

/*
 * 股票
 */
public class Stock {

private int sid;//股票编号
private String sname;//名称
private int count;//股数


public int getSid() {
	return sid;
}
public void setSid(int sid) {
	this.sid = sid;
}
public String getSname() {
	return sname;
}
public void setSname(String sname) {
	this.sname = sname;
}
public int getCount() {
	return count;
}
public void setCount(int count) {
	this.count = count;
}
}

三、创建Dao层,定义账户以及股票的接口,自定义新增和修改的方法,实现类实现该接口,重写方法  

IAccountDao:

public interface IAccountDao {
    //添加账户
    public int addAccount(Account account);
	
   //修改账户
    public int updateAccount(int aid,int money,boolean isBuyOrNot);

     //查询余额
     public int selectMoney(int aid);

}

IStockDao:  

public interface IStockDao {
  //添加股票
  public int addStock(Stock stock);
		
  //修改股票
  public int updateStock(int aid,int num,boolean isBuyOrNot);
}

AccountDaoImpl:实现类。继承自JdbcDaoSupport并实现IAccountDao接口,在这里需要用到JDBC模板的getJdbcTemplate(),通过该方法实现对SQL语句增删改查。

public class AccountDaoImpl extends JdbcDaoSupport implements IAccountDao{

	//添加
	public int addAccount(Account account) {
		String sql="insert into account(aid,aname,balance) values(?,?,?)";
		int count=this.getJdbcTemplate().update(sql, account.getAid(),account.getAname(),account.getBalance());
		return count;
	}

	//修改
	public int updateAccount(int aid, int money, boolean isBuyOrNot) {
		String sql=null;
		if(isBuyOrNot){
			sql="update account set balance=balance-? where aid=?";
		}
		else{
			sql="update account set balance=balance+? where aid=?";
		}
		int count=this.getJdbcTemplate().update(sql, money,aid);
		return count;
	}

StockDaoImpl:实现类同理

public class StockDaoImpl extends JdbcDaoSupport implements IStockDao{

	//添加股票
	public int addStock(Stock stock) {
		String sql="insert into stock(sid,sname,count) values(?,?,?)";
		int count=this.getJdbcTemplate().update(sql, stock.getSid(),stock.getSname(),stock.getCount());
		return count;
	}

	//修改
	public int updateStock(int aid, int num, boolean isBuyOrNot) {
		String sql=null;
		if(isBuyOrNot){
			sql="update stock set count=count+? where sid=?";
		}
		else{
			sql="update stock set count=count-? where sid=?";
		}
		int count=this.getJdbcTemplate().update(sql, num,aid);
		return count;
	
	}

四、业务逻辑层:service  

定义接口IStockService,并实现添加账户,股票,以及购买股票的方法.购买股票需要传入账户的id,股票的id。以及金额,股数

 

public interface IStockService {
       //添加账户
	public int addAccount(Account account);
	//添加股票
	public int addStock(Stock stock);
	
	//购买股票
	public void buyStock(int aid,int money,int sid,int num) throws StockException;
}

 实现类:StockServiceImpl。重写方法。并植入Dao。以及自定义StockException异常,用于判定用户的余额小于0,抛出异常

 

public class StockServiceImpl implements IStockService{
       //植入dao
	private IAccountDao accountDao;
	private IStockDao stockDao;
	//添加账户
    public int addAccount(Account account) {
		
		return accountDao.addAccount(account);
	}
       //添加股票
	public int addStock(Stock stock) {
		return stockDao.addStock(stock);
	}

	//购买一股票
	public void buyStock(int aid, int money, int sid, int num) throws StockException {

		boolean isBuy=true;
		accountDao.updateAccount(aid, money, isBuy);
		if(accountDao.selectMoney(aid)<=0){
			throw new StockException("捕获异常!!!");
		}
		
		stockDao.updateStock(aid, num, isBuy);
		
	}

五、Spring配置文件。[重点]

方式一:通过事务代理工厂bean进行配置[XML方式]

①引入一系列的约束头文件以及标签

 

②配置C3P0数据源以及DAO、Service  

③配置事务管理器以及事务代理工厂Bean。测试类getBean获取的是代理工厂id

 

方式二:注解。测试类getBean获取的id是原始对象service

<!-- 注解 -->
  <tx:annotation-driven transaction-manager="mytx"/>

  

方式三:Aspectj AOP配置事务 。同理 测试类getBean方法id获取的是原始对象

测试类:

public class Test01 {
@Test
public void addTest() throws StockException{
	ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
	
	IStockService service = (IStockService)ctx.getBean("stockService");
	
	service.buyStock(1, 800, 1, 2);
}
posted @ 2016-11-06 15:36  Fighting`  阅读(12958)  评论(1编辑  收藏  举报