三层架构 银行管理系统

首先还是要复习一下，常见的项目包结构

conf     配置文件  类似jdbc.properties

dao      orm中的数据访问层

            在本类上一个接口，加上一个继承接口的类，主要是接口具有耦合性搞的优点

entity    实体对象

service 也是一个接口，一个类。

SQL     项目相关的sql 

util       工具类

view     表现层代码

先看看表现层代码，相当于菜单

package view;

import java.util.Scanner;

import javax.swing.plaf.synth.Region;


import entity.Account;
import service.AccountService;
import service.AccountServiceImpl;

public class AccountView {
	
	private  static Scanner sc = new Scanner(System.in);
	static  AccountService accountService = new AccountServiceImpl();
	public static void main(String[] args) {
		
		while(true){
			System.out.println("*************欢迎进入银行系统***********");
			System.out.println("1、存钱*************************2、取钱");
			System.out.println("3、查询当前余额********************4、转账");
			System.out.println("5、注册账户********************6、更改密码");
			System.out.println("7、注销账户********************0、退出登录");
			System.out.println("请选择：");
			int n = sc.nextInt();
				switch(n){
			case 1:
				//存钱
				savemoney();
				break;
			case 2:
				//取钱
				drawmoney();
				break;
			case 3:
				//查询当前余额
				queryBalance();
				break;
			case 4:
				//转账
				transfor();
				break;
			case 5:
				//注册账户
				regist();
				break;
			case 6:
				//更改密码
				changeWord();
				break;
			case 7:
				//注销账户
				cancelAccount();
				 break;
			case 0:
				//退出登录
				System.out.println("大哥，欢迎下次再来哈！");
				System.exit(0);
				break;
				
			default:
				throw new RuntimeException("老哥，你的输入有错误！");
			
			}		
		}
		
	} 
	//注册
	public static void regist(){
		System.out.println("输入您的姓名：");
		String name = sc.next();
		System.out.println("输入的您的密码");
		String password = sc.next();
		System.out.println("大哥再确认下吧");
		String pass2 = sc.next();
		Account account = new Account(null,name,password,0.0);
		try{
			accountService.regist(account,pass2);
			System.out.println("注册成功");
			
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
	//查询余额
	public  static void queryBalance(){
		System.out.println("请输入您的账号：");
		int cardid = sc.nextInt();
		System.out.println("请输入的您的密码");
		String password = sc.next();
		try{
			double balance = accountService.queryBalance(cardid,password);
			System.out.println("您的当前余额为" + balance);
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
	//存钱
	public static void savemoney(){
		System.out.println("请输入您的账号： ");
		int id = sc.nextInt();
		System.out.println("请输入您的密码: ");
		String password = sc.next();
		System.out.println("大哥，存款存多少呢：");
		double balance = sc.nextDouble();
		
		try{
			accountService.saveMoney(id,password,balance);
			System.out.println("存款成功！");
		}catch(Exception e ){
			System.out.println(e.getMessage());
		}
		
		
	}
	//取钱
	public static void drawmoney(){
		System.out.println("请输入您的账号： ");
		int id = sc.nextInt();
		System.out.println("请输入您的密码: ");
		String password = sc.next();
		System.out.println("大哥，您要取多少钱呢：");
		double balance = sc.nextDouble();
		try{
			accountService.drawmoney1(id,password,balance);
			System.out.println("取钱成功！");
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
	//注销账户
	public static  void  cancelAccount(){
		
		System.out.println("大哥，您要注销账户？yes or no :");
		String ye = sc.next();
		if(ye.equals("yes")){
			System.out.println("请输入您的账号： ");
			int id = sc.nextInt();
			System.out.println("请输入您的密码: ");
			String password = sc.next();
			try{
				accountService.cancelAccountt(id, password);
				System.out.println("您的账号已注销！");
			}catch(Exception e){
				System.out.println(e.getMessage());
			}
		}else{
			System.out.println("大哥，您的账号已取消创建。");
		}
	}
	//更改密码
	public static  void changeWord(){
		System.out.println("大哥，您是否要进行更改密码操作？yes or no :");
		String ye = sc.next();
		if(ye.equals("yes")){
			System.out.println("请输入您的账号： ");
			int id = sc.nextInt();
			System.out.println("请输入您的原密码: ");
			String password = sc.next();
			System.out.println("请输入您的新密码： ");
			String nepassword = sc.next();
			try{
				accountService.changepassword(id, password,nepassword);
				System.out.println("您的账号已更改密码！");
			}catch(Exception e){
				System.out.println(e.getMessage());
			}
		}else{
			System.out.println("大哥，您的账号已取消更改密码");
		}
		
		
	}
	//转账功能
	public static void transfor(){
		System.out.println("请输入您的账号：");
		int fromcardid = sc.nextInt();
		System.out.println("请输入的您的密码");
		String password = sc.next();
		System.out.println("钱转给谁呢?请输入她的账号：");
		int tocardid = sc.nextInt();
		System.out.println("转账的金额");
		double money = sc.nextDouble();
		try{
			accountService.transforyou(fromcardid,password,tocardid,money);
			System.out.println("转账完成");
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
		}
	}
	

 接着业务逻辑层代码

接口代码：

package service;

import entity.Account;

public interface AccountService {
	//业务功能
	//开户功能
	public   void regist(Account account,String pass2);
	//查询余额
	public double queryBalance(int cardid,String password);
	//转账
	public  void transforyou(int fromcardid,String password,int tocardid,double money);
	//存款功能
	public void saveMoney(int cardid,String password,double balance);
	//取款
	public void drawmoney1(int cardid,String password,double balance);
	//注销账户
	public void cancelAccountt(int cardid,String password);
	//更改密码
	public void changepassword(int id, String password, String nepassword);
	
}

核业务逻辑层心代码：

package service;

import java.sql.Connection;
import java.sql.SQLException;

import javax.management.RuntimeErrorException;

import dao.AccountDao;
import dao.AccountdDaoImpl;
import entity.Account;
import util.jdbcUtil3;

public class AccountServiceImpl implements AccountService {
	AccountDao accountdDao = new AccountdDaoImpl(); 
	Connection conn = null;
	@Override
	public void regist(Account account, String pass2){
		String name = account.getName();
		if(name==null){
			throw new RuntimeException("用户名为空");
		}
		//判断两次密码是否一致
		String password = account.getPassword();
		if(!password.equals(pass2)){
			throw new RuntimeException("两次密码不一致");
		}
		//创建连接，设置手动提交，控制事务

		try {
			conn = jdbcUtil3.getConnection();
			conn.setAutoCommit(false);
			//插入记录
			accountdDao.insertAccount(account);
			//提交
			conn.commit();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			try {
				conn.rollback();
			} catch (SQLException e1) {
				throw new RuntimeException("回滚异常");
			}
		}finally{
			//关闭连接
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				throw new RuntimeException("关闭连接异常");
			}	
		}
	}
	@Override
	public double queryBalance(int cardid, String password) {
		double balance = 0.0;
		Account account = accountdDao.queryAccountByCardid(cardid);
		//查看账号是否存在
		if(account==null){
			throw new RuntimeException("账户不存在");
		}
		if(!account.getPassword().equals(password)){
			throw new RuntimeException("密码输入错误！");
		}
	
		try {
			conn = jdbcUtil3.getConnection();
			balance = account.getBalance();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			throw new RuntimeException("查询连接错误");
		}finally{
			try {
				jdbcUtil3.release(null, null, conn);
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				System.out.println("关闭连接异常！");
			}
		}
		return balance;
	}
	@Override
	public void transforyou(int fromcardid, String password, int tocardid, double money) {
		//判断我方用户是否存在
		Account account1 = accountdDao.queryAccountByCardid(fromcardid);
		Account	account2 = accountdDao.queryAccountByCardid(tocardid);
		if(account1 ==null){
			throw new RuntimeException("您好，你的账户为空！");
		}
		//对方账号是否存在
		if(account2==null){
			throw new RuntimeException("你好，你要转账的账户不存在！");
		}
		//判断密码上是否输入正确
		if(!account1.getPassword().equals(password)){
			throw new RuntimeException("密码不一致");
		}
		//我方余额是否大于转账金额
		if(account1.getBalance()

数据访问层 dao 接口和代码

package dao;

import entity.Account;

public interface AccountDao {
	//数据插入 注册账号
	public void insertAccount(Account account);
	//根据卡号查看账户信息 从而查询余额
	public Account queryAccountByCardid(int cardid);
	//更新信息。进行转账
	public void updateAccount(Account account1);
	//存款
	public void savemoneybyCardid(double balance,int card);
	//取款
	public void drawmoneybyCardid(double bala, int cardid);
	//注销账户
	public void deleteCardid(int cardid);
	//更改密码操作
	public void updateCardid(int id, String nepassword);
}

package dao;

import entity.Account;
import rowmapper.AccountRowMapper;
import rowmapper.RowMapper;
import util.JdbcTemplate;

public  class AccountdDaoImpl implements AccountDao {
	JdbcTemplate template = new JdbcTemplate();
	//多态来创建对象
	public void insertAccount(Account account) {
		template.update("insert into account(name,password,balance) values(?,?,?)", account.getName(),account.getPassword(),account.getBalance());
	}

	@Override
	public Account queryAccountByCardid(int cardid) {

		Account account =(Account) template.queryForObject("select * from account where cardid=? ",new AccountRowMapper(),cardid);
		return account;
	}

	@Override
	public void updateAccount(Account account1) {
		template.update("update account set balance=? where cardid=?",account1.getBalance(),account1.getCardid());
		
	}

	@Override
	public void savemoneybyCardid(double balance,int card) {
		template.update("update account set balance = ? where cardid =?",balance,card);
		
	}

	@Override
	public void drawmoneybyCardid(double bala, int cardid) {
		template.update("update account set balance = ? where cardid =?", bala , cardid);
	}

	@Override
	public void deleteCardid(int cardid) {
		template.update("delete from  account where cardid=?  ", cardid);
		
	}
	@Override
	public void updateCardid(int id, String nepassword) {
		template.update("update account set password = ? where cardid = ?", nepassword,id);
	}
}

局部演示图

先睡了，明天更新。