图书管理系统java代码

由于图书管理系统代码比较长，这里提供一个基本的框架供参考：

Book.java

public class Book {
    private String bookId;
    private String title;
    private String author;
    private String publisher;
    private int year;
    private double price;

    // 构造函数
    public Book(String bookId, String title, String author, String publisher, int year, double price) {
        this.bookId = bookId;
        this.title = title;
        this.author = author;
        this.publisher = publisher;
        this.year = year;
        this.price = price;
    }

    // getter和setter方法
    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    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 int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

Reader.java

public class Reader {
    private String readerId;
    private String name;
    private String phone;

    // 构造函数
    public Reader(String readerId, String name, String phone) {
        this.readerId = readerId;
        this.name = name;
        this.phone = phone;
    }

    // getter和setter方法
    public String getReaderId() {
        return readerId;
    }

    public void setReaderId(String readerId) {
        this.readerId = readerId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

Borrow.java

public class Borrow {
    private String borrowId;
    private String bookId;
    private String readerId;
    private Date borrowDate;
    private Date dueDate;
    private boolean returned;

    // 构造函数
    public Borrow(String borrowId, String bookId, String readerId, Date borrowDate, Date dueDate) {
        this.borrowId = borrowId;
        this.bookId = bookId;
        this.readerId = readerId;
        this.borrowDate = borrowDate;
        this.dueDate = dueDate;
        this.returned = false;
    }

    // getter和setter方法
    public String getBorrowId() {
        return borrowId;
    }

    public void setBorrowId(String borrowId) {
        this.borrowId = borrowId;
    }

    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    public String getReaderId() {
        return readerId;
    }

    public void setReaderId(String readerId) {
        this.readerId = readerId;
    }

    public Date getBorrowDate() {
        return borrowDate;
    }

    public void setBorrowDate(Date borrowDate) {
        this.borrowDate = borrowDate;
    }

    public Date getDueDate() {
        return dueDate;
    }

    public void setDueDate(Date dueDate) {
        this.dueDate = dueDate;
    }

    public boolean isReturned() {
        return returned;
    }

    public void setReturned(boolean returned) {
        this.returned = returned;
    }
}

Library.java

import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Library {
    private Connection conn;
    private Statement stmt;

    public Library() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost/library", "root", "");
            stmt = conn.createStatement();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 查询图书
    public List<Book> searchBooks(String keyword) {
        List<Book> books = new ArrayList<Book>();
        try {
            String sql = "SELECT * FROM books WHERE title LIKE '%" + keyword + "%' OR author LIKE '%" + keyword + "%' OR publisher LIKE '%" + keyword + "%'";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String bookId = rs.getString("book_id");
                String title = rs.getString("title");
                String author = rs.getString("author");
                String publisher = rs.getString("publisher");
                int year = rs.getInt("year");
                double price = rs.getDouble("price");
                Book book = new Book(bookId, title, author, publisher, year, price);
                books.add(book);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return books;
    }

    // 借阅图书
    public boolean borrowBook(String bookId, String readerId, Date dueDate) {
        try {
            String sql = "INSERT INTO borrows (book_id, reader_id, borrow_date, due_date) VALUES ('" + bookId + "', '" + readerId + "', NOW(), '" + dueDate + "')";
            int result = stmt.executeUpdate(sql);
            if (result == 1) {
                sql = "UPDATE books SET available = 0 WHERE book_id = '" + bookId + "'";
                result = stmt.executeUpdate(sql);
                if (result == 1) {
                    return true;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    // 归还图书
    public boolean returnBook(String borrowId) {
        try {
            String sql = "UPDATE borrows SET returned = 1 WHERE borrow_id = '" + borrowId + "'";
            int result = stmt.executeUpdate(sql);
            if (result == 1) {
                sql = "SELECT book_id FROM borrows WHERE borrow_id = '" + borrowId + "'";
                ResultSet rs = stmt.executeQuery(sql);
                if (rs.next()) {
                    String bookId = rs.getString("book_id");
                    sql = "UPDATE books SET available = 1 WHERE book_id = '" + bookId + "'";
                    result = stmt.executeUpdate(sql);
                    if (result == 1) {
                        return true;
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
}

这个代码框架可以帮助您了解如何使用Java实现图书管理系统的基本功能，但是需要根据具体的需求进行修改和完善。