《ATM机模拟程序》java

package ATM; //此页是基本方法页，所有的方法都放在本页，其他类通过调用本页方法来实现功能 import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; //atm的增删改查 public class Basic_operation{ //以下三个接数据库增删改查所用的变量 public String sql; public PreparedStatement ps; public static Connection con; public static String cardID="";//用户卡号 public static String password="123456";//用户登陆密码(默认为123456) public static String password2="";//新密码(修改密码) public static String password3="";//确认新密码(修改密码) public static String balanceFixed ="0";//盛放余额的变量 public String s="";//接收各个方法返回值的变量 //构造方法 Basic_operation() { //连接数据库 con = GetDBConnection.ConnectDB("atmBankDatabase", "root", ""); if(con == null) { System.out.println("数据库连接失败"); return; } sql="select balance from account where id=?;"; try { ps=con.prepareStatement(sql); ps.setString(1, cardID); ResultSet rs =ps.executeQuery();//向数据库发送数据查询语句 while(rs.next()) { balanceFixed = rs.getString("balance"); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //1.查余额 public String select(String cardID) throws SQLException { String sql="select balance from account where id=?;"; ps=con.prepareStatement(sql); ps.setString(1, cardID); ResultSet rs =ps.executeQuery();//向数据库发送数据查询语句 while(rs.next()) { balanceFixed = rs.getString("balance"); } double balance_number = Double.parseDouble(balanceFixed); System.out.println("当前账户余额："+balance_number); balanceFixed = String.valueOf(balance_number); s="当前账户余额："+balanceFixed; return s; } //2.取款 public String Withdrawal(String cardID,String take_money2) { //take_money要取的钱数 boolean isNum = take_money2.matches("[0-9]+"); if(isNum) { double take_money = Double.parseDouble(take_money2); if(take_money<=5000) { if(take_money%100 == 0) { try { //balance_number:数字格式的余额，用于和将要取的金额做比较 double balance_number = Double.parseDouble(balanceFixed); if(take_money<=balance_number) { sql="update account set balance=?-? where id=?;"; ps=con.prepareStatement(sql); ps.setDouble(1, balance_number);//余额 ps.setDouble(2, take_money);//要取的金额 ps.setString(3, cardID); ps.executeUpdate(); balance_number=balance_number-take_money; balanceFixed=String.valueOf(balance_number); System.out.println("取款成功,当前余额为："+balanceFixed); s="取款成功,当前余额为："+balanceFixed; }else { System.out.println("余额不足,请重新输入"); s="余额不足,请重新输入"; //Withdrawal(cardID,take_money); } } catch (SQLException e) { System.out.println("取款出错"); s="取款出错"; } }else { System.out.println("取款金额必须是100的整数倍,请重新输入"); s="取款金额必须是100的整数倍,请重新输入"; } }else { System.out.println("单次取款金额不得超过5000,请重新输入"); s="单次取款金额不得超过5000,请重新输入"; } }else { s="取款失败,您的输入为非数字"; System.out.println("取款失败,您的输入为非数字"); } return s; } //3.存款 public String deposit(String cardID,String m) { boolean isNum = m.matches("[0-9]+"); if(isNum) { double add_money2 = Double.parseDouble(m); if(add_money2>0) { if(add_money2%100 == 0) { try { //balance_number:数字格式的余额，用于和将要取的金额做比较 double balance_number = Double.parseDouble(balanceFixed); sql="update account set balance=?+? where id=?;"; ps=con.prepareStatement(sql); ps.setDouble(1, balance_number);//余额 ps.setDouble(2, add_money2);//要存的金额 ps.setString(3, cardID); ps.executeUpdate(); balance_number=balance_number+add_money2; balanceFixed=String.valueOf(balance_number); s="存款成功 当前余额为:"+balanceFixed; System.out.println("存款成功"); System.out.println("当前余额为："+balanceFixed); } catch (SQLException e) { System.out.println("存款出错"); } }else { s="存款金额必须是100的整数倍,请重新输入"; System.out.println("存款金额必须是100的整数倍,请重新输入"); } }else { s="不得输入负数,请重新输入"; System.out.println("不得输入负数,请重新输入"); } }else { s="存款失败,您的输入为非数字"; System.out.println("存款失败,您的输入为非数字"); } return s; } //4.修改密码 public String changePassword(String cardID,String password,String password2,String password3) { String yuanPassword="";//原密码 sql="select apassword from account where id=?;"; try { ps=con.prepareStatement(sql); ps.setString(1, cardID); ResultSet rs =ps.executeQuery();//向数据库发送数据查询语句 while(rs.next()) { yuanPassword=rs.getString("apassword"); } if(yuanPassword.equals(password)) { if(password2.length()>=6) { char[] a = password2.toCharArray(); if(a[0]==a[1]&&a[1]==a[2]&&a[2]==a[3]&&a[3]==a[4]&&a[4]==a[5]) { System.out.println("不可以设置全部数字相同的密码"); s="不可以设置全部数字相同的密码"; }else { if(password2.equals(password3)) { sql="update account set apassword=? where id=?;"; ps = con.prepareStatement(sql); ps.setString(1, password2); ps.setString(2, cardID); ps.executeUpdate(); System.out.println("密码修改成功"); s="密码修改成功"; }else { System.out.println("两次密码不相同，请重新输入"); s="两次密码不相同，请重新输入"; } } }else { System.out.println("修改失败，密码长度不可小于6位"); s="修改失败，密码长度不可小于6位"; } }else { System.out.println("原密码错误，请重新输入"); s="原密码错误，请重新输入"; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return s; } //5.登陆 public String jlogin(String cardID,String password) { String newCardID="0"; String newPassword="0"; sql="select id,apassword from account where id=?;"; try { ps=con.prepareStatement(sql); ps.setString(1, cardID); ResultSet rs =ps.executeQuery();//向数据库发送数据查询语句 while(rs.next()) { newCardID= rs.getString("id"); newPassword=rs.getString("apassword"); } if(cardID.equals(newCardID) && password.equals(newPassword)) { System.out.println("登陆成功"); s = "登陆成功"; this.cardID=cardID;//使另一个类可以调用这个cardID }else { System.out.println("用户名或密码不正确,请重新输入"); s="用户名或密码不正确,请重新输入"; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return s; } public static void main(String[] args) { // TODO Auto-generated method stub Basic_operation a = new Basic_operation(); //以下开始设计测试用例 //----------------------------------------------- //1、测试查询语句(未报错) // try { // a.select("62250028"); // } catch (SQLException e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } //2、测试取款语句 //(每次取款金额为100的倍数(256,3000,6000)，总额不超过5000元(6000)，支取金额不允许透支(2000)) //a.Withdrawal("62250028", 256);//取款金额必须是100的整数倍,请重新输入 //a.Withdrawal("62250028", 3000);//取款成功 //a.Withdrawal("62250028", 6000);//单次取款金额不得超过5000,请重新输入 //3、测试存款语句 //不能出现负存款(-100,4000) //a.deposit("62250028", -100);//不得输入负数,请重新输入 //a.deposit("62250028", 9100);//存款成功(回车)当前余额为：10000.0 //4、新密码长度不小于6位，