圖書管理系統之我見

時間 2019-11-26

標籤圖書管理系統简体版

原文原文鏈接

作完這個eclipse控制檯版本的圖書管理系統,感受略有收穫,對類與對象的一些關係,接口的使用,以及HashMap,語句斷定等有了更深入的理解.java

而這個系統還會繼續進化. 加入數據庫, web展現.亦或者使用java圖形界面.git

1.首先第一步,我要作這個圖書管理系統,我更理解爲一個圖書館管理系統, 而不單單是圖書. 首先java是面向對象的.那麼好吧,有一個圖書館接口,一些書架,一些書放在書架上.github

以後功能需求要能實現註冊,登錄,退出.web

登錄以後實現書的借閱,歸還.數據庫

2.這一步使用了大量的邏輯斷定判斷,由於以爲是練手的小項目,前期作得有點"冗餘",多餘的一些雜質讓我感受作不動.經過放低要求,才發現,原來簡單而美妙.eclipse

package 圖書管理系統2;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;

public class LoginStuff {
    static Scanner in = new Scanner(System.in);

    // 登錄方式選區,經過卡號呢仍是用戶名密碼
    public static void loginSelect() {
        System.out.println("1.刷卡登錄.<輸入卡號>\n2.用戶名密碼登錄.\n#.返回上級");
        String loginSelectNum = in.next();
        boolean numRight = loginSelectNum.equals("1") || loginSelectNum.equals("2") || loginSelectNum.equals("#");
        if (numRight) {
            if (loginSelectNum.equals("1")) {
                LoginStuff.loginWithID();
            }
            if (loginSelectNum.equals("2")) {
                LoginStuff.loginWithUserAndPassword();
            }
            if (loginSelectNum.equals("#")) {
                Service.getHello();
            }
        } else {
            System.out.println("輸入錯誤,請輸入1或2或#.💗");
            System.out.println();
            loginSelect();
        }
    }

    // 執行login(ID)前必須執行該方法
    // 使用ID卡號登錄
    public static void loginWithID() {
        System.out.println("請輸入您的卡號,以#號結束💗,(或只輸入#返回上一層)");
        String ID_numberStr = "";
        String nextNumber = in.next();
        int OriginalIDlength = Library.IDLength;
        ID_numberStr = nextNumber.trim();
        boolean IDPassed = false;

        if (ID_numberStr.endsWith("#")) {
            if (ID_numberStr.length() == 1 && ID_numberStr.equals("#")) {
                loginSelect();
                return;
            }
            ID_numberStr = ID_numberStr.replace("#", "");
            if (ID_numberStr.length() != OriginalIDlength) {
                IDPassed = false;
                System.out.println("正確卡號長度爲" + OriginalIDlength + "位.請從新輸入:💗");
            }
            if (ID_numberStr.length() == OriginalIDlength) {
                IDPassed = true;
            }

        }
        if (IDPassed) {
            long ID_number = (long) Long.valueOf(ID_numberStr);
            login(ID_number);
        } else {
            loginWithID();
        }

    }

    // 經過用戶名及密碼登錄的方法,這一方法只是斷定其格式,以後再調用了 login(inputUserName, inputPassWord)
    public static void loginWithUserAndPassword() {
        System.out.println("請輸入用戶名及密碼登錄.💗,(或只輸入#返回上一層)");
        String inputUserName = in.next();
        if(inputUserName.equals("#")) {
            loginSelect();
            return;
        }
        String inputPassWord = in.next();
        boolean regexFailed = inputUserName == null || inputUserName == "" || inputUserName.length() == 0
                || inputPassWord == null || inputPassWord == "" || inputPassWord.length() == 0;
        while (regexFailed) {
            System.err.println("用戶名或密碼不能爲空!💗");
            loginWithUserAndPassword();
        }

        if (!regexFailed) {
            login(inputUserName, inputPassWord);
        }

    }

    // 登錄方式的選擇2, 經過用戶名和密碼登錄 以前已經使用loginWithUserAndPassword()進行了用戶名和密碼的接受和格式斷定
    // 而這一步是斷定用戶數據庫的userList中和輸入的用戶名密碼進行比對,若是正確則提示登錄成功,
    // 若是對比失敗則從新調用loginWithUserAndPassword()方法進行用戶名和密碼的接受和斷定,其後再這個login方法進行比對.循環往復

    public static void login(String userName, String passWord) {
        Set<User> userList = UserDatabase.getUserInstance();
        boolean userInList = false;
        boolean userAuthPassed = false;
        String thisNick = null;
        String pass = null;
        User thisUser_ = null;
        Iterator<User> userIt = userList.iterator();
        while (userIt.hasNext()) {
            thisUser_ = userIt.next();
            if (userName.equals(thisUser_.getUserName())) {
                pass = thisUser_.getPassWord();
                userInList = true;
            }
            if (userInList) {
                if (passWord.equals(pass)) {
                    userAuthPassed = true;
                    thisNick = thisUser_.getNickName();
                    break;
                }
            }
        }
        // 登錄經過以後
        if (userAuthPassed) {
            System.out.println(thisNick + "登錄成功!");
            System.out.println("快和小夥伴們一塊兒玩耍(看書)吧!💗");
            MemberService.showMemberSerivce(thisUser_);
        } else {
            System.out.println("帳號或密碼錯誤,請從新登錄!💗");
            loginWithUserAndPassword();
        }

    }

    // 經過用戶ID進行登錄,先經過User中的IDNumberSet這個Set集合進行取出,
    // 使用了IDNumberJudge(Long ID)方法進行了"是否有這個ID"的比對
    public static void login(long ID_Number) {
        long inputID = User.getID_number();
        // 該boolean值就是去肯定是否有這個ID號碼,有則爲true.沒有這個ID也就是
        // 說明用戶ID是不存在的,不能登錄,其後能夠再設置讓其進行註冊
        boolean IDReady = User.IDNumberJudge(inputID);
        if (IDReady) {
            HashMap<Long, User> userData = UserDatabase.getUserDataMap();
            User thisUser = userData.get(inputID);
            System.out.println("------------------------");
            System.out.println(thisUser);
            System.out.println("刷卡成功,能夠隨意看書啦.當您離開記得再次刷卡以扣除時間段內消費!💗");
            System.out.println("------------------------");
            MemberService.showMemberSerivce(thisUser);
        } else {
            System.out.println("抱歉😭,沒有找到關於您卡號的信息!請稍後再試.如需幫助請聯繫管理員.💗");
            System.out.println("或者您也能夠進行使用面板的1號選項進行註冊.💗");
            Service.getHello();
        }
    }

}

package 圖書管理系統2;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegisterStuff {

    static Scanner in = new Scanner(System.in);
    private static String userName;
    private static String passWord;
    private static String sex;
    private static String nickName;
    private static int age;

    public User newRegisterStuff(String username, String password1, String password2, String sex, String nickname,
            int age) {

        String regex = "^[a-zA-Z0-9\u4E00-\u9FA5]+$";
        Pattern pattern = Pattern.compile(regex);
        Matcher match = pattern.matcher(username);
        boolean b = match.matches();
        int alreadyHasUserName = 1;

        boolean userNamePassed = (username != "" || username != null || username.length() != 0);
        if (userNamePassed) {
            if (!b) {
                System.out.println("用戶名只能由數字字母和下劃線組成!請從新輸入!💗");
                register();
                // return;
            } else {
                // 用戶名格式經過後,再斷定用戶名是否存在於已有用戶的用戶名字段中,已存在則返回true,不存在返回false
                alreadyHasUserName = userNameAgain(username);
                if (alreadyHasUserName == 1) {// 已經存在該帳戶名,則從新輸入
                    // 去斷定用戶名有一個什麼標記才行呢?使用boolean和int去斷定最終仍是會不行.
                    System.out.println("該用戶名已經存在,請選用其餘用戶名~💗");
                    username = null;
                    register();

                    // return;
                } else if (alreadyHasUserName == 0) {// 不重複則經過,並賦值給this.userName
                    this.userName = username;
                }
            }
        } else {
            while (!userNamePassed) {
                System.out.println("用戶名爲空,請從新填寫註冊信息.💗");
                register();
                // return;
            }
        }
        // 斷定密碼
        boolean passwordPassed = password1.equals(password2);
        if (passwordPassed) {
            this.passWord = password1;
        } else {
            while (!passwordPassed) {
                System.out.println("密碼兩次不一致,請覈對後再次輸入!(只輸入兩次密碼💗)");
                String password_ = in.next();
                String password2_ = in.next();
                passwordPassed = passWordAgain(password_, password2_);
                if (passwordPassed) {
                    this.passWord = password_;
                }
            }
        }

        // 斷定性別輸入 (不足)英文只支持小寫.
        boolean sexPassed = (sex.equals("男") || sex.equals("女") || sex.equals("man") || sex.equals("man")
                || sex.equals("woman") || sex.equals("boy") || sex.equals("girl"));
        if (sexPassed) {
            this.sex = sex;
        } else {
            while (!sexPassed) {
                System.out.println("性別填寫錯誤,請再次填寫:");
                String sex_ = in.next();
                sexPassed = sexAgain(sex_);
                if (sexPassed) {
                    this.sex = sex_;
                }
            }
        }
        // 斷定暱稱合法性
        boolean nickNamePassed = (nickname != "" || nickname != null || nickname.length() != 0);
        if (nickNamePassed) {
            this.nickName = nickname;
        } else {
            while (!nickNamePassed) {
                System.out.println("暱稱爲空,請再次填寫:");
                String nickname_ = in.next();
                nickNamePassed = nickNameAgain(nickname_);
                if (nickNamePassed) {
                    this.nickName = nickname_;
                }
            }
        }
        // 判斷年齡合法性
        boolean agePassed = (age < 999 && age > 0);
        if (agePassed) {
            this.age = age;
        } else {
            while (!agePassed) {
                System.out.println("只接受0歲以上兒童以及999歲之內的銀河系生物!請再次輸入年齡!");
                int age_ = in.nextInt();
                agePassed = ageAgain(age_);
                if (agePassed) {
                    this.age = age_;
                }
            }
        }
        // 結束了全部數據的判斷
        /////////////////////////////////////////////////////////////////////////////////
        boolean AuthPassed = alreadyHasUserName == 0 && userNamePassed && b && passwordPassed && sexPassed
                && nickNamePassed && agePassed;
        User newUser = null;
        // 若是註冊成功則建立新user對象.
        if (AuthPassed) {
            newUser = new User(this.userName, this.passWord, this.sex, this.nickName, this.age);
        }
        return newUser;

    }// RegisterStuff(.......註冊信息.......)_END

    private static String getUserName() {
        return userName;
    }

    private static String getPassWord() {
        return passWord;
    }

    private static String getSex() {
        return sex;
    }

    private static String getNickName() {
        return nickName;
    }

    private static int getAge() {
        return age;
    }

    public RegisterStuff() {
    }

    // 註冊
    public static void register() {
        System.out.println("請輸入您的>>帳戶名<<>>密碼<<>>確認密碼<<>>性別<<>>暱稱<<>>年齡<<\n以空格隔開~💗(*^_^*)💗");
        RegisterStuff rs = new RegisterStuff();
        User newUser = rs.newRegisterStuff(in.next(), in.next(), in.next(), in.next(), in.next(), in.nextInt());
        if (newUser != null) {
            registerToUser(newUser);// 在將註冊信息註冊入了用戶數據庫後. 可能會爲null 此時在這個方法中判斷
            printOK(newUser);// 登錄成功提示,並提示用戶的暱稱等.
        }
    }

    // 註冊完成後用戶數據放入UserDatabase
    public static void registerToUser(User newUser) {

        UserDatabase.setUserNameList(newUser.getUserName());
        UserDatabase.setUserInstance(newUser);
        HashMap<Long, User> userDatabaseInRegister = UserDatabase.getUserDataMap();
        long ID = newUser.getID_number();
        userDatabaseInRegister.put(ID, newUser);
        UserDatabase.setUserData(userDatabaseInRegister);

        // 註冊信息已送入UserDatabase 能夠將用戶數據使用IO寫入txt文件
    }

//    // 最後補的 暫未加入
//    public static void afterRegister() {
//        printOK();
//        BookShelf bs = new BookShelf();
//        bs.BookShelfInit();
//        bs.getAllCategory();
//        System.out.println("請問你要查閱哪些書籍?或哪一本?");
//    }

    // 註冊成功以後
    private static void printOK(User user) {

        System.out.println("註冊成功!");
        HashMap<Long,User> userInstanceInRegister = UserDatabase.getUserDataMap();
        User thisUser = userInstanceInRegister.get(user.getID_number());
        
        System.out.println("***"+thisUser+"***");

    }

    // 從數據庫取出用戶名,查看此次的用戶是否存在重複
    public int userNameAgain(String userName) {
        // 從用戶數據庫List獲取已經存在的帳戶對象
        Set<String> userAlreadyHave = UserDatabase.getUserNameList();

        // 從數據庫取出,去斷定用戶名是否存在,單獨寫個方法
        for (String alreadyHaveName : userAlreadyHave) {
            if (userName.equals(alreadyHaveName)) {
                return 1;// 重複用戶名返回1
            }
        }
        // 不重複用戶名返回0
        return 0;
    }

    // 從新寫入passWord屬性
    public boolean passWordAgain(String password1, String password2) {

        if (password1.equals(password2)) {
            System.out.println("本次密碼覈對正確!");
            return true;
        }
        return false;
    }

    // 從新寫入sex屬性
    private boolean sexAgain(String sex_) {
        if ((sex_.equals("男") || sex_.equals("女") || sex_.equals("man") || sex_.equals("man") || sex_.equals("woman")
                || sex_.equals("boy") || sex_.equals("girl"))) {
            return true;
        }
        return false;
    }

    // 從新寫入nickName屬性
    public boolean nickNameAgain(String nickname_) {

        if (nickname_ != "" || nickname_ != null || nickname_.length() != 0) {
            return true;
        }
        return false;
    }

    // 從新寫入age屬性
    public boolean ageAgain(int age_) {
        if (age_ < 999 && age_ > 0) {
            return true;
        }
        return false;
    }

}

3. 有了登錄註冊,在用戶登錄後要提供會員服務,我直接創建了一個MemberService類.其實還有管理員Service和計算機Service類,應該提取某些Service做爲一個Service接口,不過還沒想好.this

package 圖書管理系統2;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Scanner;
import java.util.Set;

public class MemberService {

    static Scanner in = new Scanner(System.in);

    public static void showMemberSerivce(User thisUser_) {
        
        System.out.println("您好," + thisUser_.getNickName() + ",這是會員服務欄目,您可享受一下服務,Enjoy it!💗");
        System.out.println("1.借書\t\t2.還書\n3.點個咖啡\t\t4.上網衝浪\n5.健身運動\t\t6.圖書館留言\n#.返回上級目錄(退出登錄)");
        String serNum = in.next();
        switch (serNum) {
        case "1":borrowBookSer(thisUser_);
            break;
        case "2":giveBackBookSer(thisUser_);
            break;
        case "3":
            break;
        case "4":
            break;
        case "5":
            break;
        case "6":
            break;
        case "#":LoginStuff.loginSelect();
            break;
        default:
            System.out.println("請輸入正確的服務選擇~!💗");
            showMemberSerivce(thisUser_);
            break;
        }
    }
    public static void borrowBookSer(User user) {
        System.out.println("您好💗"+user.getNickName()+",請問您想借閱哪本書呢?💗");
        HashMap<String, Books> books = BookShelf.getBookMap();
        Set<String> bookNames = books.keySet();
        for(String bns : bookNames) {
            System.out.print(bns+" : "+books.get(bns).beBorrowed);
        }
        
        System.out.println("輸入書名,借閱書籍.💗");
        String wantedBook = in.next();
        user.borrow(books.get(wantedBook));
        showMemberSerivce(user);
    }
    
    public static void giveBackBookSer(User user) {
        System.out.println("您好💗"+user.getNickName()+",請問您想還哪本書呢?💗");
        ArrayList<String> userBorrowedBooks = user.getBorrowedBooks();
        if(userBorrowedBooks == null) {
            System.out.println("抱歉您沒有書要還~💗");
            return;
        }
        System.out.println("您借閱的書此時還有以下:");
        int hasBorrowedCount = 0;
        for(String books:userBorrowedBooks) {
            hasBorrowedCount++;
            System.err.println(books);
        }
        if(hasBorrowedCount != 0) {
            System.out.println("請輸入您要還的書的書名~:");
            String giveBackBookName = in.next();
            //從用戶已借閱列表中刪除這本書
            boolean giveback = userBorrowedBooks.remove(giveBackBookName);
            HashMap<String, Books> bookInstanceMap =BookShelf.getBookMap();
            Books backBookInstance = bookInstanceMap.get(giveBackBookName);
            
            user.giveBack(backBookInstance, giveback);
            showMemberSerivce(user);
        }else {
            System.err.println("Sorry,您沒有書要還~💗");
            showMemberSerivce(user);
        }
    }

}