import?java.sql.*;??

import?java.util.*;??

public?class?ATM1?{??

????String?code;??

????int?pass;??

????double?money;??

????int?i=1;??

????//檢查登錄??

????public?void?checkLogin(){??

????????int?i=1;??

????????while(i<=3){??

????????????System.out.print("請輸入您的卡號：");??

????????????Scanner?sc=new?Scanner(System.in);??

????????????String?code_=sc.nextLine();??

????????????System.out.print("請輸入您的密碼：");??

????????????int?pass_=sc.nextInt();??

????????????try{??

????????????????//加載驅動??

????????????????Class.forName("com.mysql.jdbc.Driver");??

????????????????//建立連接??

????????????????java.sql.Connection?conn?=?DriverManager.getConnection("jdbc:mysql://localhost:3306/atmdb","root","root");?????

????????????????//創建sql傳送對象??

????????????????Statement?stmt?=?conn.createStatement();??

????????????????//將sql語句通過sql傳送對象傳送到數據庫并執行，返還結果集??

????????????????String?sql?=?"select?*?from?account?where?code='"+code_+"'and?pass="+pass_;??

????????????????ResultSet?rs?=?stmt.executeQuery(sql);????

????????????????//當賬號、密碼與sql中的賬號與密碼相對應的時候??

????????????????//把sql中的相關數據傳送到目前變量以便進行數據操作??

????????????????if(rs.next()){??

????????????????????code?=?rs.getString(1);??

????????????????????pass?=?rs.getInt(2);??

????????????????????money?=?rs.getDouble(3);??

????????????????????loadSys();??

????????????????}??

????????????????rs.close();??

????????????????stmt.close();??

????????????????conn.close();??

????????????}??

????????????//捕獲異常??

????????????catch?(Exception?e){??

????????????????System.out.println(e);??

????????????}??

????????????//出現三次錯誤之后提示??

????????????i++;??

????????????if(?i?==?3){??

????????????System.out.print("您已經輸錯三次密碼，該卡已經被鎖，請及時到相關網點咨詢！");??

????????????}??

????????}??

????}??

????//保存數據??

????//注意;下面的關鍵字(????"pass、code、money")要與數據庫中的名字一樣，避免出現錯誤??

????public?void?saveDb(){??

????????try{??

????????????Class.forName("com.mysql.jdbc.Driver");??

????????????java.sql.Connection?conn?=?DriverManager.getConnection("jdbc:mysql://localhost:3306/atmdb","root","root");?????

????????????Statement?stmt?=?conn.createStatement();??

????????????String?sql="update?account?set?pass?="+pass+"?where?code='"+code+"'";????

????????????//dode為String型，所以要用‘’括起來??

????????????String?sql1="update?account?set?money="+money+"?where?code='"+code+"'";??

????????????stmt.executeUpdate(sql);????//update操作進行數據更新??

????????????stmt.executeUpdate(sql1);??

????????????stmt.close();??

????????????conn.close();??

????????}?????

????????catch?(Exception?e){??

????????????????System.out.println(e);??

????????????}??

??????????

????}??

????//歡迎界面??

????public?static?void?welcome(){??

????????System.out.println("!*****************************************!");??

????????System.out.println("!*************歡迎使用華夏銀行*************!");??

????????System.out.println("!*****************************************!");??

????}??

????//系統主界面??

????public?void?loadSys(){??

????????System.out.println(".------------------------------------.");??

????????System.out.println("1?查詢余額??????????????????????存款?2");??

????????System.out.println("3?取款??????????????????????修改密碼?4");??

????????System.out.println("5?退出????????????????????????????????");??

????????System.out.println(".------------------------------------.");??

????????System.out.print("請輸入相應的功能選項數字：");??

????????Scanner?sz=new?Scanner(System.in);??

????????int?num=sz.nextInt();?????????

????????switch(num){??

????????????case?1:?????

????????????????chaxun();??

????????????????break;??

????????????case?2:?????

???????????????cunkuan();??

???????????????break;??

????????????case?3:?????

???????????????qukuan();??

???????????????break;??

????????????case?4:?????

???????????????xiugai();??

???????????????break;??

????????????case?5:?????

???????????????quit();??

???????????????break;??

????????????default:??

???????????????System.out.println("您輸入的數字有誤！");??

???????????????loadSys();??

????????}??

????}??

????//查詢余額??

????public?void?chaxun(){??

????????System.out.println("您卡上的余額為："?+money);??

????????loadSys();??

????}??

????//存款??

????public?void?cunkuan(){??

????????System.out.print("請輸入存款金額：");??

????????Scanner?ck=new?Scanner(System.in);??

????????double?money1=ck.nextDouble();??

????????money=money+money1;??

????????saveDb();??

????????System.out.println("您卡上的余額為："?+money);??

????????System.out.println("請收好您的卡!");??

????????loadSys();??

????}??

????//取款??

????public?void?qukuan(){??

????????System.out.print("請輸入取款金額：");??

????????Scanner?qk=new?Scanner(System.in);??

????????double?money2=qk.nextDouble();??

????????if(money2>money){??

????????????System.out.println("您的余額不足！");????

????????????qukuan();??

????????}else{??

????????????money=money-money2;??

????????????saveDb();??

????????????System.out.println("您卡上的余額為："?+money);??

????????????System.out.println("請收好您的現金！");???

????????????loadSys();??

????????}??

????}??

????//修改密碼??

????public?void?xiugai(){??

????????int?cs?=?0;??

????????System.out.print("請輸入原密碼：");???

????????Scanner?mm=new?Scanner(System.in);??

????????int?pass1=mm.nextInt();??

????????System.out.print("請輸入新密碼：");???

????????int?pass2=mm.nextInt();??

????????System.out.print("請再次輸入新密碼：");???

????????int?pass3=mm.nextInt();??

????????if(pass==pass1&&?pass2==pass3){??

????????????System.out.println("修改密碼成功！");???

????????????pass=pass2;??

????????????saveDb();??

????????????loadSys();??

????????}else{??

????????????if(cs<2){??

???????????????System.out.print("您輸入的密碼有誤！");???

???????????????cs++;??

???????????????xiugai();??

????????????}else{??

???????????????quit();??

????????????}??

????????}??

????}??

????//退出??

????public?void?quit(){??

????????System.exit(1);???????

????}??

????//主函數??

????public?static?void?main(String?args[]){??

????????/*try{?

????????????Class.forName("com.mysql.jdbc.Driver");?

????????????java.sql.Connection?conn?=?DriverManager.getConnection(?"jdbc:mysql://localhost:3306/atmdb","root","root");?

????????????Statement?stmt?=?conn.createStatement();?

????????????String?sql?=?"select?*?from?account";?

????????????ResultSet?rs?=?stmt.executeQuery(sql);?

????????????while?(rs.next()){?

????????????????String?code?=?rs.getString(1);?

????????????????int?pass?=?rs.getInt(2);?

????????????????double?money?=?rs.getDouble(3);?

????????????????System.out.println(code+"|"+pass+"|"+money);?

????????????}?

????????????rs.close();?

????????????stmt.close();?

????????????conn.close();?

????????}?

????????catch(Exception?e){?

????????System.out.println(e);?

????????}*/??

????????ATM1?atm?=?new?ATM1();??

????????atm.welcome();??

????????atm.checkLogin();??

????????}?????

} ?