图书馆管理系统（数据库版）

项目框架

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项目分包

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上面为本次项目的分包建包示意图，大概的内容分类便是如此（dao为数据访问层，entity为实体类包，service为业务逻辑层，util为工具类包，view为UI界面包）

数据库列表

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代码分析

工具包

在本次项目中，用到一些可以通用的代码，这里把它们编写为了工具类（即util包中的类）
BookUtils类：

import dao.LogDao;
import dao.impl.LogDaoImpl;
import entity.Book;
import entity.Log;
import entity.User;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Scanner;//书籍工具类
public class BookUtils {User user = new User();LogDao logDao = new LogDaoImpl();//罚金方法public void cost(int book_id,String type) throws ParseException {Date nowDate = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");String borrow_time = logDao.viewBorrowTime(book_id);//获取借书时间String return_time = sdf.format(nowDate);//获取归还时间Date d1 = sdf.parse(borrow_time);//借出时间Date d2 = sdf.parse(return_time);//归还时间long charge = (d2.getTime() - d1.getTime()) / (24 * 60 * 60 * 1000);if (charge <= 7){System.out.println("该书籍被您借出" + charge + "天,"+"感谢您规范用书！");}else {if (type.equals("学生")){System.out.println("该书籍被您借出"+ charge + "天,"+"已逾期"+(charge-7)+"天,您需要缴纳罚金："+(charge-7)*5+"元,谢谢配合！");}else {System.out.println("该书籍被您借出"+ charge + "天,"+"已逾期"+(charge-7)+"天,您需要缴纳罚金："+(charge-7)*3+"元,谢谢配合！");}}}//书籍Id限定public int idLimit(List<Book> books) {Scanner scanner = new Scanner(System.in);List<Integer> borrowedId = new ArrayList<>();//存放id的集合int book_id = 0;//id输入boolean flag = true;//增强for，遍历集合取出id存放在borrowedIdfor (Book book: books){borrowedId.add(book.getBook_id());//借阅书籍Id集合}while (flag){book_id = scanner.nextInt();//增强for，遍历并对比输入的idfor (Integer e : borrowedId){if (book_id == e){flag = false;}}if (flag){System.out.println("书籍Id输入错误，请重新输入：");}}return book_id;}
}

InputUtils类：对于输入的内容进行类型和范围的判断

package util;import java.util.Scanner;public class InputUtils {Scanner scanner = new Scanner(System.in);@SuppressWarnings({"all"})//int类型输入判断public int input() {while (!scanner.hasNextInt()) {//没有这一行的话会导致无限循环String input = scanner.next();System.out.println("不是数字，重新输入");}//当是数字时循环结束int inputNum = scanner.nextInt();return inputNum;}//double类型输入判断public double inputDouble() {while (!scanner.hasNextDouble()) {//没有这一行的话会导致无限循环String input = scanner.next();System.out.println("不是数字，重新输入");}//当是数字时循环结束double inputNum = scanner.nextDouble();return inputNum;}//double范围判断public double scopeDouble(double inputNum) {InputUtils inputUtils = new InputUtils();while (true) {if (inputNum < 0) {System.out.println("请输入正确的数字");inputNum = inputUtils.inputDouble();}else {break;}}return inputNum;}//int范围判断public int scope(int inputNum,int scope) {InputUtils inputUtils = new InputUtils();while (true) {if (inputNum > scope || inputNum < 1) {System.out.println("请输入正确的数字");inputNum = inputUtils.input();}else {break;}}return inputNum;}
}

ModifyUtils类：用户修改电话号码的类

package util;import java.util.Scanner;import static util.RegisterUtils.validateMobilePhone;public class ModifyUtils {//修改电话public String modifyPhone(){Scanner scanner = new Scanner(System.in);System.out.println("请输入新的电话号码：");String newPhone = scanner.next();while (!validateMobilePhone(newPhone)){System.out.println("输入错误，请重新输入（电话号码为11位）");newPhone = scanner.next();}return newPhone;}public String modifyPassword(){Scanner scanner = new Scanner(System.in);System.out.println("请输入新密码：");String newPassword = scanner.next();return newPassword;}}

RegisterUtils类：对于用户名、性别、电话、类型的判断

package util;import dao.impl.AdminDaoImpl;
import dao.impl.UserDaoImpl;import java.util.Scanner;
import java.util.regex.Pattern;public class RegisterUtils {//用户用户名判断public boolean nameProve(String user_name) {UserDaoImpl userDao1 = new UserDaoImpl();if (null != userDao1.nameProve(user_name)) {return false;} else {return true;}}//管理员用户名判断public boolean adminNameProve(String admin_name) {AdminDaoImpl adminDao1 = new AdminDaoImpl();if (null != adminDao1.nameProve(admin_name)) {return false;} else {return true;}}//性别判断public String sexProve(String sexNum) {String sex = null;if (sexNum.equals("1")) {sex = "男";return sex;} else if (sexNum.equals("2")) {sex = "女";return sex;} else {System.out.println("输入错误，请重新输入（1、男 | 2、女)");return null;}}//电话判断public static boolean validateMobilePhone(String in) {Pattern pattern = Pattern.compile("^[1]\\d{10}$");return pattern.matcher(in).matches();}//类型判断public String typeProve ( String typeNum){String type = null;if (typeNum.equals("1")) {type = "学生";return type;} else if (typeNum.equals("2")) {type = "教师";return type;} else {System.out.println("输入错误，请重新输入（1、学生 | 2、教师)");return null;}}
}