java课程设计报告-自动取款机模拟程序.doc

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}StrUtil(判断字符串是否为空)：package edu.hfuu.util；/*** 判断字符串* * @author Thunder-king**/public class StrUtil {public static boolean isEmpty(String str){if(str.isEmpty()||str==null){return true；}else{return fal * @param cardNum* @return List*/public static List query(String cardNum) {List users = new ArrayList()；String sql = "select cardNum,password,balance from user where cardNum =?"；users = UserDao.select * 判断输入是否是12 位数字* * @param str* @return*/public static boolean isCardNum(String str) {if (Pattern.matches("^[0-9]{12}$", str)) {return true；} else {return false；}}}QueryBalance(查询余额工具)：package edu.hfu}}InputJudge(输入判断)：package edu.hfuu.util；import java.util.regex.Pattern；public class InputJudge {/*** 判断输入是否是数字* * @param str* @return*/public static boolean isFigure(String str) {if (Pattern.matches( * 修改密码*/public boolean changePassword(String passwordOne,String passwordTwo,String cardNum) {if (passwordOne.equals(passwordTwo)) {String sql = "update user set password=? where cardNum=?；"；if (UserDpublic class GeneralUser {/*** 取款*/public boolean withdrawingMoney(int money,int balance,String cardNum) {String sql = "update user set balance=? where cardNum=?；"；if (UserDao.update(sql, (balance - mreturn conn；}public static void closeConnection(Connection conn){try {conn.close()；} catch (SQLException e) {e.printStackTrace()；System.out.println("数据库关闭异常！")；}}}GeneralUser(普通用户工具)：package edu.hfuu.import java.sql.DriverManager；import java.sql.SQLException；public class DbUtil {private final static String URL = "jdbc:mysql://localhost:3306/atm?user=root&password=root&useUnicode=true&characterEnco

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