bankimpl.java

一个简单的银行系统

package biz;

import java.io.DataOutputStream;
import java.io.File;
import dao.AccountDao;
import dao.DaoImpl;
import entity.*;
import exception.AccountNotExistException;
import exception.BalanceNotEnoughException;
import exception.RegisterException;

public class BankImpl implements Bank {
	private AccountDao dao = new DaoImpl();

	public void delete(long id) {
		dao.deleteAccount(id);
	}

	public void deposit(long id,double money) {
		Account a=null;
		try {
			a=this.findAccountById(id);
		} catch (AccountNotExistException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		double d=a.getBalance();
		d+=money;
		a.setBalance(d);
		try {
			dao.updateAcccount(a);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public long login(long id, String password) throws AccountNotExistException{
		Account a=this.findAccountById(id);
		if(a!=null){
			if(a.getPassword().equals(password)){
				return a.getCardId();
			}
		}
		return -1;
	}

	public long register(String personId, String password, String password2,
			String name, int type) throws RegisterException{
		Account a = null;
		long id=0;
		if (password.equals(password2)) {
			try {
				if (type == 1) {
					id = dao.findLastId();
					a = new SavingAccount(personId, password, name);
					a.setCardId(id);
					dao.insertAccount(a);
				}
				if (type == 2) {
					id = dao.findLastId();
					a = new CreditAccount(personId, password, name, 10000.0);
					a.setCardId(id);
					dao.insertAccount(a);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}else throw new RegisterException("2次密码输入错误");
		return id;
	}

	public double select(long id) {
		Account a=null;
		try {
			a = this.findAccountById(id);
		} catch (AccountNotExistException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		double balance=a.getBalance();
		return balance;
		
	}

	public void withDraw(long id,double money) throws BalanceNotEnoughException{
		Account a=null;
		try {
			a=this.findAccountById(id);
		} catch (AccountNotExistException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if(a instanceof CreditAccount){
			CreditAccount c=(CreditAccount)a;
			double d=a.getBalance();
			if(money<=(d+c.getCredit())){
				d-=money;
				a.setBalance(d);
			}else throw new BalanceNotEnoughException("余钱不足");
		}else{
			double d=a.getBalance();
			if(money<=d){
				d-=money;
				a.setBalance(d);
			}else throw new BalanceNotEnoughException("余钱不足");
		}
		try {
			dao.updateAcccount(a);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public Account findAccountById(long id) throws AccountNotExistException {
		Account a = null;
		try {
			a = dao.getAccountById(id);
		} catch (Exception e) {
			e.printStackTrace();
		}
		if (a == null)
			throw new AccountNotExistException("此帐号不存在");
		else
			return a;
	}

}