这篇文章介绍写这个系统中使用到的工具类。

        验证码生成器

java">package com.wzb.utils.captcha;import java.util.Random;public class CaptchaUtils {// 定义包含数字和大小写字母的字符集private static final String CHAR_POOL = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";// 生成指定长度的验证码public static String generateCode(int length) {StringBuilder code = new StringBuilder();Random random = new Random();// 从字符池中随机选取字符for (int i = 0; i < length; i++) {int index = random.nextInt(CHAR_POOL.length());code.append(CHAR_POOL.charAt(index));}return code.toString();}
}

        md5密码加密工具

java">package com.wzb.utils.md5;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;public class MD5Util {// MD5加密方法public static String md5(String input) {try {// 创建 MessageDigest 实例，指定 MD5 算法MessageDigest md = MessageDigest.getInstance("MD5");// 更新 MessageDigest 实例，提供待加密的数据md.update(input.getBytes());// 进行加密，得到字节数组byte[] digest = md.digest();// 转换为十六进制字符串StringBuilder hexString = new StringBuilder();for (byte b : digest) {// 将每个字节转为两位的十六进制数String hex = Integer.toHexString(0xFF & b);if (hex.length() == 1) {hexString.append('0');}hexString.append(hex);}// 返回加密后的结果return hexString.toString();} catch (NoSuchAlgorithmException e) {e.printStackTrace();return null; // 如果出现异常，返回 null}}
}

        控制台等待工具

java">package com.wzb.utils.wait;public class Wait {public static void waitMoments() throws InterruptedException {for (int i = 0; i < 6; i++) {System.out.print(".");Thread.sleep(500);}System.out.println();}
}

        各种显示的菜单

        主菜单

java">package com.wzb.utils.menu;public class MainMenu {public static void showMainMenu() {System.out.println("\t\t\t\t\tWelcome to pet system");System.out.println("\t\t\t************************************");System.out.println("\t\t\t\t\t     请输入数字选择：");System.out.println("\t\t\t\t\t     1.用户操作");System.out.println("\t\t\t\t\t     2.宠物操作");System.out.println("\t\t\t\t\t     0.退出系统");System.out.println("输入你的选择-->");}
}

         用户登录菜单

java">package com.wzb.utils.menu.user;public class UserLoginMenu {public static void showUserLoginMenu() {System.out.println("\t\t\t\t\tWelcome to user login system");System.out.println("\t\t\t*******************************************");System.out.println("\t\t\t\t\t     请输入数字选择：");System.out.println("\t\t\t\t\t     1.登录");System.out.println("\t\t\t\t\t     2.注册");System.out.println("\t\t\t\t\t     0.返回上级");System.out.println("输入你的选择-->");}
}

        用户主菜单

java">package com.wzb.utils.menu.user;public class UserMenu {public static void showUserMenu() {System.out.println("\t\t\t\t\tWelcome to User system");System.out.println("\t\t\t************************************");System.out.println("\t\t\t\t\t     请输入数字选择：");System.out.println("\t\t\t\t\t     1.个人信息");System.out.println("\t\t\t\t\t     2.浏览宠物");System.out.println("\t\t\t\t\t     3.账户充值");System.out.println("\t\t\t\t\t     4.修改密码");System.out.println("\t\t\t\t\t     5.配送地址");System.out.println("\t\t\t\t\t     6.注销账号");System.out.println("\t\t\t\t\t     0.退出登录");System.out.println("输入你的选择-->");}}

        宠物主菜单

java">package com.wzb.utils.menu.pet;public class PetMenu {public static void showPetMenu() {System.out.println("\t\t\t\t\tWelcome to pet system");System.out.println("\t\t\t************************************");System.out.println("\t\t\t\t\t     请输入数字选择：");System.out.println("\t\t\t\t\t     1.查看所有宠物");System.out.println("\t\t\t\t\t     2.新增一个宠物");System.out.println("\t\t\t\t\t     3.删除一个宠物");System.out.println("\t\t\t\t\t     4.修改一个宠物");System.out.println("\t\t\t\t\t     5.查看一个宠物");System.out.println("\t\t\t\t\t     0.返回上一级");System.out.println("输入你的选择-->");}
}

        商店菜单

java">package com.wzb.utils.menu.shop;public class ShopMenu {public static void showShopMenu() {System.out.println("\t\t\t\t\tWelcome to shop system");System.out.println("\t\t\t************************************");System.out.println("\t\t\t\t\t     请输入数字选择：");System.out.println("\t\t\t\t\t     1.查看所有宠物");System.out.println("\t\t\t\t\t     2.添加购物车");System.out.println("\t\t\t\t\t     3.查看购物车");System.out.println("\t\t\t\t\t     4.结算");System.out.println("\t\t\t\t\t     0.返回上一级");System.out.println("输入你的选择-->");}
}

        管理员菜单

java">package com.wzb.utils.menu.admin;public class AdminMenu {public static void showAdminMenu() {System.out.println("\t\t\t\t\tWelcome to admin system");System.out.println("\t\t\t************************************");System.out.println("\t\t\t\t\t     请输入数字选择：");System.out.println("\t\t\t\t\t     1.查看所有用户");System.out.println("\t\t\t\t\t     2.删除一个用户");System.out.println("\t\t\t\t\t     3.禁用一个用户");System.out.println("\t\t\t\t\t     4.修改一个用户");System.out.println("\t\t\t\t\t     5.查看一个用户");System.out.println("\t\t\t\t\t     6.查看管理员信息");System.out.println("\t\t\t\t\t     0.退出登录");System.out.println("输入你的选择-->");}
}