基于java的图书管理系统代码

抱歉，作为一个AI语言模型，我不具备编写代码的能力。但是，以下是一个简单的图书管理系统的类图示。


该系统主要包含以下类：

1. Book：表示图书的类，包含书名、作者、出版社、ISBN号等属性。
2. Library：表示图书馆的类，包含所有的图书、借阅记录等属性，以及对图书的增、删、改、查操作。
3. User：表示用户的类，包含用户名、密码等属性，以及对图书的借、还操作。
4. BorrowRecord：表示借阅记录的类，包含借阅时间、还书时间等属性。

具体代码实现可参考以下代码：

Book类：

public class Book {
    private String title;
    private String author;
    private String publisher;
    private String isbn;

    public Book(String title, String author, String publisher, String isbn) {
        this.title = title;
        this.author = author;
        this.publisher = publisher;
        this.isbn = isbn;
    }

    // Getters and setters
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public String getIsbn() {
        return isbn;
    }

    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }
}

Library类：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Library {
    private Map<String, Book> books;
    private List<BorrowRecord> borrowRecords;

    public Library() {
        books = new HashMap<>();
        borrowRecords = new ArrayList<>();
    }

    public void addBook(Book book) {
        books.put(book.getIsbn(), book);
    }

    public void removeBook(String isbn) {
        books.remove(isbn);
    }

    public void updateBook(String isbn, Book book) {
        books.put(isbn, book);
    }

    public Book getBook(String isbn) {
        return books.get(isbn);
    }

    public List<Book> getAllBooks() {
        return new ArrayList<>(books.values());
    }

    public void borrowBook(String isbn, User user) {
        Book book = books.get(isbn);
        if (book != null) {
            BorrowRecord borrowRecord = new BorrowRecord(user, book);
            borrowRecords.add(borrowRecord);
        }
    }

    public void returnBook(String isbn, User user) {
        for (BorrowRecord borrowRecord : borrowRecords) {
            if (borrowRecord.getUser().equals(user) && borrowRecord.getBook().getIsbn().equals(isbn)) {
                borrowRecords.remove(borrowRecord);
                break;
            }
        }
    }
}

User类：

public class User {
    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    // Getters and setters
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

BorrowRecord类：

import java.time.LocalDateTime;

public class BorrowRecord {
    private User user;
    private Book book;
    private LocalDateTime borrowTime;
    private LocalDateTime returnTime;

    public BorrowRecord(User user, Book book) {
        this.user = user;
        this.book = book;
        this.borrowTime = LocalDateTime.now();
    }

    // Getters and setters
    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public Book getBook() {
        return book;
    }

    public void setBook(Book book) {
        this.book = book;
    }

    public LocalDateTime getBorrowTime() {
        return borrowTime;
    }

    public void setBorrowTime(LocalDateTime borrowTime) {
        this.borrowTime = borrowTime;
    }

    public LocalDateTime getReturnTime() {
        return returnTime;
    }

    public void setReturnTime(LocalDateTime returnTime) {
        this.returnTime = returnTime;
    }
}

以上是一个简单的图书管理系统的类图示和代码实现，仅供参考。具体实现需要根据实际需求进行调整和完善。