javaSwing+MySQL实现图书管理系统

javaSwing已经学了一个月了，重最开始的生疏到后来慢慢的熟悉其实这并不是一个短暂的过程，也是十分消耗时间的.菜单页面设计的不是很好，各方面也需要改进，数据库的关联性也不是很强，等有时间了在回来慢慢改。在这里贴一份源码纪念一下。
登录界面
可以直接到GitHub下载源码

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.sql.SQLException;
import java.util.Random;

class Login1 {
    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        DataBaseConnect connect = new DataBaseConnect();
//        connect.getConnection();
//       connect.Insert("黄洪飞","123456");
        connect.Insert("胡彩月", "123456");
//       connect.Delete("haungg","23132");
        Login login = new Login();
        login.LoginJFrame();
    }
}

class Login extends JFrame implements ActionListener {
    //登录、注册、取消
    JButton btnLogin, btnRegister, btnCancel;
    JPanel pnlSouth, pnlNorth, pnlCenter1, pnlCenter2;//注册面板
    private JLabel jLabel1, jlabel;
    private JLabel jLabelPassWord;
    private JTextField jTextFieldUser, jtextField;
    private JPasswordField jPasswordField;
    static String user, passWord;
    private JPanel imagePanel;
    Code code = new Code();
    JFrame jFrame = new JFrame("图书管理系统");

    //    ImageIcon imageIcon=new ImageIcon("E:\\java\\Login.jpg");
////    private ImageIcon background=new ImageIcon("E:\\java\\Login.jpg");;
//    JFrame jFrame = new JFrame("图书管理系统");
    public void LoginJFrame() {
//        JFrame jFrame = new JFrame("图书管理系统");

        ImageIcon imageIcon = new ImageIcon("E:\\java\\Login.jpg");
        JLabel label = new JLabel(imageIcon);
        label.setBounds(0, 0, imageIcon.getIconWidth(), imageIcon.getIconHeight());
        jFrame.getLayeredPane().add(label, new Integer(Integer.MIN_VALUE));
        JPanel panel = (JPanel) jFrame.getContentPane();
        panel.setOpaque(false);
        jFrame.setLayout(null);

        jTextFieldUser = new JTextField(15);
        pnlNorth = new JPanel();
        jLabel1 = new JLabel("欢迎进入图书管理系统！");
        jLabel1.setFont(new Font("宋体", Font.BOLD, 24));
        pnlNorth.add(jLabel1);
        pnlNorth.setOpaque(false);
        pnlNorth.setBounds(100, 50, 300, 59);
        jFrame.add(pnlNorth);
        //登录
        pnlCenter1 = new JPanel();
        pnlCenter2 = new JPanel();
        JLabel jLabelUser = new JLabel(" 用 户：");
        jLabelUser.setFont(new Font("宋体", Font.BOLD, 16));
        jLabelUser.setOpaque(false);
        jTextFieldUser = new JTextField(15);
        pnlCenter1.add(jLabelUser);
        pnlCenter1.add(jTextFieldUser);
        pnlCenter1.setOpaque(false);

        pnlCenter1.setBounds(100, 100, 300, 60);
        jFrame.add(pnlCenter1);
        //密码
        jLabelPassWord = new JLabel("密 码：");
        jLabelPassWord.setFont(new Font("宋体", Font.BOLD, 16));
        jPasswordField = new JPasswordField(15);
        pnlCenter2.add(jLabelPassWord);
        pnlCenter2.add(jPasswordField);
        pnlCenter2.setBounds(100, 150, 300, 60);
        pnlCenter2.setOpaque(false);
        //验证码
        jlabel = new JLabel("验证码");
        jlabel.setFont(new Font("宋体", Font.BOLD, 16));
        jtextField = new JTextField(6);
        JPanel jPanelCenter = new JPanel();
        jPanelCenter.add(jlabel);
        jPanelCenter.add(jtextField);
        jPanelCenter.add(code);
        jPanelCenter.setBounds(100, 200, 300, 60);
        jPanelCenter.setOpaque(false);
        jFrame.add(jPanelCenter);
        System.out.println(code.generateCode());
        //登录
        jFrame.add(pnlCenter2);
        pnlSouth = new JPanel();
        btnLogin = new JButton("登录");
        btnLogin.addActionListener(this);
        btnRegister = new JButton("注册");
        btnRegister.addActionListener(this);
        btnCancel = new JButton("取消");
        btnCancel.addActionListener(this);
        pnlSouth.add(btnLogin);
        pnlSouth.add(btnRegister);
        pnlSouth.add(btnCancel);
        pnlSouth.setOpaque(false);
        pnlSouth.setBounds(130, 250, 300, 50);
        jFrame.add(pnlSouth);
        jFrame.setSize(imageIcon.getIconWidth(), imageIcon.getIconHeight());
        jFrame.setVisible(true);
        jFrame.setLocation(300, 300);
        jFrame.setResizable(false);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public String getUser() {

        return this.user;
    }

    public String getPassWord() {
        return this.passWord;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        //登录
        DataBaseConnect connect = new DataBaseConnect();
        if (e.getSource() == btnLogin) {
            String user = jTextFieldUser.getText();
            String passWord = jPasswordField.getText();
            Login.user = user;
            Login.passWord = passWord;
            String codes = jtextField.getText();
            if (user.equals("")) {
                JOptionPane.showMessageDialog(this, "请输入账号");
            } else if (user.length() != 0) {
                try {
                    if (connect.Select(user, passWord)) {
                        if (codes.equals(code.getCode())) {
                            JOptionPane.showMessageDialog(this, "恭喜您，登陆成功！");
                            jFrame.setVisible(false);
                            dispose();
                            new MenuJFrame();
                        } else {
                            JOptionPane.showMessageDialog(this, "输入验证码有误！");
                        }
                    } else {
                        JOptionPane.showMessageDialog(this, "该账号不存在！");
                    }
                } catch (SQLException | ClassNotFoundException ex) {
                    ex.printStackTrace();
                }
            }
        }
        //注册
        else if (e.getSource() == btnRegister) {
            String user = jTextFieldUser.getText();
            String password = jPasswordField.getText();
            try {
                boolean result = connect.Insert(user, password);
                if (result) {
                    connect.Insert(user, password);
                    JOptionPane.showMessageDialog(this, "恭喜,注册成功");
//                    setVisible(false);
//                    dispose();
//                    new MenuJFrame();

                } else {
                    JOptionPane.showMessageDialog(this, "该账号已经存在！");
                }
            } catch (SQLException | ClassNotFoundException ex) {
                ex.printStackTrace();
            }

        } else if (e.getSource() == btnCancel) {
            JOptionPane.showMessageDialog(this, "告辞");
            System.exit(0);
        }
    }
}

class Code extends JComponent implements MouseListener {

    public static String codes;  //自动生成的验证码

    private int width, height = 40;  //设置验证码高度、宽度

    private int codesLength = 4;  //设置代码长度

    private Random random = new Random(); //生成数字的方法

    public Code() {
        width = this.codesLength * 16 + (this.codesLength - 1) * 10; //根据验证码长度设置宽度
        setPreferredSize(new Dimension(width, height));  //设置背景大小
        setSize(width, height);  //设置验证码长度和宽度
        this.addMouseListener(this);
        setToolTipText("点击可更换验证码");
    }

    //得到生成的验证码
    public int getCodesLength() {
        return codesLength;
    }


    //设置验证码的长度
    public void setCodesLength(int codeLength) {
        if (codesLength < 4) {
            this.codesLength = 4;
        } else {
            this.codesLength = codeLength;
        }

    }

    public String getCode() {
        return codes;
    }


    //让验证码产生随机的颜色
    public Color getRandColor(int min, int max) {

        if (min > 255)
            min = 255;
        if (max > 255)
            max = 255;
        int red = random.nextInt(max - min) + min;
        int green = random.nextInt(max - min) + min;
        int blue = random.nextInt(max - min) + min;
        return new Color(red, green, blue);
    }

    // 设置验证码具体的数字或字母是什么
    protected String generateCode() {
        char[] codes = new char[this.codesLength];
        for (int i = 0, len = codes.length; i < len; i++) {
            if (random.nextBoolean()) {
                codes[i] = (char) (random.nextInt(10) + 48);
            } else {
                codes[i] = (char) (random.nextInt(26) + 97);
            }
        }
        Code.codes = new String(codes);
        return Code.codes;
    }


    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        if (this.codes == null || this.codes.length() != this.codesLength) {  //判断生成的验证码是否为空或超出长度
            this.codes = generateCode();
        }
        width = this.codesLength * 16 + (this.codesLength - 1) * 10;
        super.setSize(width, height);  //接口使用，验证码字体大小
        super.setPreferredSize(new Dimension(width, height));//接口使用，验证码背景大小
        Font mFont = new Font("Arial", Font.BOLD | Font.ITALIC, 25);  //设置字体和字体大小
        g.setFont(mFont);  //设置对象
        //绘制出验证码的背景的矩形轮廓
        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(getRandColor(200, 250));
        g2d.fillRect(0, 0, width, height);
        g2d.setColor(getRandColor(180, 200));
        g2d.drawRect(0, 0, width - 1, height - 1);
        //绘制出验证码背景的线
        int i = 0, len = 150;
        for (; i < len; i++) {
            int x = random.nextInt(width - 1);
            int y = random.nextInt(height - 1);
            int x1 = random.nextInt(width - 10) + 10;
            int y1 = random.nextInt(height - 4) + 4;
            g2d.setColor(getRandColor(180, 200));
            g2d.drawLine(x, y, x1, y1);
        }


        //绘制出验证码的具体字母
        i = 0;
        len = this.codesLength;
        FontMetrics fm = g2d.getFontMetrics();
        int base = (height - fm.getHeight()) / 2 + fm.getAscent();
        for (; i < len; i++) {
            int b = random.nextBoolean() ? 1 : -1;
            g2d.rotate(random.nextInt(10) * 0.01 * b);
            g2d.setColor(getRandColor(20, 130));
            g2d.drawString(codes.charAt(i) + "", 16 * i + 10, base);
        }
    }

    //下一个验证码
    public void nextCode() {
        generateCode();
        repaint();
        ;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        codes = generateCode();
        repaint();
//        nextCode();
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }
}

import java.sql.*;

class DataBaseConnect {
    private static final String USER = "root";
    private static final String PASS = "123456";
    private Connection connection;
    private PreparedStatement sql;
    private ResultSet resultSet;

    Connection getConnection() throws SQLException, ClassNotFoundException {
        String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
        Class.forName(JDBC_DRIVER);
        String DB_URl = "jdbc:mysql://root@localhost:3306/library?characterEncoding=utf8";
        connection = DriverManager.getConnection(DB_URl, USER, PASS);
        System.out.println("数据库链接成功");
        return connection;
    }

    public void CloseConnection(Connection connection) throws SQLException {
        if (connection != null)
            connection.close();
    }

    public boolean Select(String user, String pass) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        sql = connection.prepareStatement("select *from library.db_账户 ");
        int flag = 0;
        try {
            resultSet = sql.executeQuery();
            while (resultSet.next()) {
                String username = resultSet.getString("username");
                String passWord = resultSet.getString("password");
                if (user.equals(username) && pass.equals(passWord))
                    flag = 1;
            }
        } catch (Exception e) {
            e.printStackTrace();

        }
        if (flag == 1)
            return true;
        else
            return false;
    }

    public boolean Insert(String user, String password) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
//     sql=connection.prepareStatement("insert into library.db_book(ID,username, password) values(?,?,?)");
        boolean result = this.Select(user, password);
        if (!result) {
            sql = connection.prepareStatement("insert into library.db_账户(username, password) values(?,?)");
//          sql.setInt(1,0);
            sql.setString(1, user);
            sql.setString(2, password);
            sql.executeUpdate();
            return true;
        } else {
            return false;
        }
    }

    public void Delete(String user, String password) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        boolean result = this.Select(user, password);
        if (!result) {
            sql = connection.prepareStatement("delete from library.db_账户 where username=?");
            sql.setString(1, user);
//           sql.setString(2,password);
            sql.executeUpdate();

        }
    }

    //更新数据库用户信息
    public void UpData(String user, String passWord) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        sql = connection.prepareStatement("update library.db_账户 set username=? where password=?");
        sql.setString(1, user);
        sql.setString(2, passWord);
        sql.executeUpdate();
    }

    public String AddBook(String bookName, String bookAuthor, String bookTime, int number) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        sql = connection.prepareStatement("insert into library.db_book(BookName, BookAuthor, BookTime, BookNumber) values(?,?,?,?)");
        sql.setString(1, bookName);
        sql.setString(2, bookAuthor);
        sql.setString(3, bookTime);
        sql.setInt(4, number);
        sql.executeUpdate();
        return "添加书籍成功";
    }

    public boolean SelectBook(String bookName) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        sql = connection.prepareStatement("select *from library.db_book ");
        resultSet = sql.executeQuery();
        int flag = 0;
        while (resultSet.next()) {
            String book = resultSet.getString("BookName");
            if (bookName.equals(book))
                flag = 1;
        }
        if (flag == 1)
            return true;
        else
            return false;
    }

    public void DeleteBook(String bookName) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        sql = connection.prepareStatement("delete from library.db_book where BookName=?");
        sql.setString(1, bookName);
//           sql.setString(2,password);
        sql.executeUpdate();

    }
}

菜单界面

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Menu {
    public static void main(String[] args) {
        new MenuJFrame();
    }
}

class MenuJFrame extends JFrame implements ActionListener {
    private JButton jButton1 = new JButton("增加图书");
    private JFrame jFrame = new JFrame("图书菜单窗口");
    private JButton jButton2 = new JButton("删除图书");

    public MenuJFrame() {
//        jFrame.setSize(600, 600);
        jFrame.setLocationRelativeTo(null);

        ImageIcon imageIcon = new ImageIcon("E:\\java\\Menu.gif");
        JLabel label = new JLabel(imageIcon);
        label.setBounds(0, 0, imageIcon.getIconWidth(), imageIcon.getIconHeight());
        jFrame.getLayeredPane().add(label, new Integer(Integer.MIN_VALUE));
        JPanel panel = (JPanel) jFrame.getContentPane();
        panel.setOpaque(false);
        jFrame.setSize(imageIcon.getIconWidth(), imageIcon.getIconHeight());
        jFrame.setResizable(false);
        jFrame.setLocation(300,300);
//        jFrame.setLayout(null);

        JPanel jPanel1 = new JPanel(new BorderLayout());
        //创建面板
        jPanel1.setOpaque(false);
        JTabbedPane tabbedPane = new JTabbedPane();
        JToolBar toolBar1 = new JToolBar();
        toolBar1.setOpaque(false);
        toolBar1.setLayout(new FlowLayout(FlowLayout.LEFT, 15, 10));
        JToolBar jToolBar2 = new JToolBar();
        jToolBar2.setLayout(new FlowLayout(FlowLayout.LEFT, 15, 10));
        jToolBar2.setOpaque(false);
        JToolBar jToolBar3 = new JToolBar();
        jToolBar3.setOpaque(false);
        jToolBar3.setLayout(new FlowLayout(FlowLayout.LEFT, 15, 10));
        JToolBar jToolBar4 = new JToolBar();
        jToolBar4.setOpaque(false);
        jToolBar4.setLayout(new FlowLayout(FlowLayout.LEFT, 15, 10));
        tabbedPane.add("图书管理", toolBar1);
        tabbedPane.setOpaque(false);
        jButton1.setOpaque(false);
        jButton1.setFont(new Font("宋体", Font.BOLD, 16));
        jButton2.setFont(new Font("宋体", Font.BOLD, 16));
//        JButton jButton1 = new JButton("增加图书");
//        JButton jButton2 = new JButton("删除图书");
        toolBar1.add(jButton1);
        jButton1.addActionListener(this);
        jButton2.addActionListener(this);
        toolBar1.add(jButton2);

        tabbedPane.add("借书", jToolBar2);
        JButton jButton3 = new JButton("借书");
        jButton3.setFont(new Font("宋体", Font.BOLD, 16));
        jButton3.addActionListener(this);
        JButton jButton4 = new JButton("查看书籍目录");
        jButton4.setFont(new Font("宋体", Font.BOLD, 16));
        jButton4.addActionListener(this);
        jToolBar2.add(jButton3);
        jToolBar2.add(jButton4);

        tabbedPane.add("还书", jToolBar3);
        JButton jButton5 = new JButton("还书");
        jButton5.setFont(new Font("宋体", Font.BOLD, 16));
        jButton5.addActionListener(this);
        JButton jButton6 = new JButton("选项6");
        jToolBar3.add(jButton5);
        jToolBar3.add(jButton6);
        tabbedPane.add("用户信息管理", jToolBar4);
        JButton jButton7 = new JButton("个人信息管理");
        jButton7.setFont(new Font("宋体", Font.BOLD, 16));
        JButton jButton8 = new JButton("完善用户其它信息");
        jButton8.setFont(new Font("宋体", Font.BOLD, 16));
        jToolBar4.add(jButton7);
        jToolBar4.add(jButton8);
        jFrame.getContentPane().add(tabbedPane, BorderLayout.NORTH);
        jFrame.getContentPane().add(jPanel1, BorderLayout.CENTER);

        tabbedPane.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                System.out.println("当前选项卡：" + tabbedPane.getSelectedIndex());
            }
        });

        tabbedPane.setSelectedIndex(1);
        jFrame.setVisible(true);
        //借书按钮监听器
        jButton3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                jFrame.setVisible(false);
                dispose();
                BorrowBook borrowBook = new BorrowBook();
                borrowBook.Remind();
            }
        });
        //还书按钮监听器
        jButton5.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                jFrame.setVisible(false);
                dispose();
                ReturnBook returnBook = new ReturnBook();
                returnBook.returnBook();
            }
        });
        //个人 用户管理监听器
        jButton7.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                jFrame.setVisible(false);
                dispose();
                UserManage userManage = new UserManage();
                userManage.User();
            }
        });
        //完善用户信息监听器
        jButton8.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                jFrame.setVisible(false);
                dispose();
                UserInformation userInformation = new UserInformation();
                userInformation.Information();
            }
        });
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == jButton1) {
            jFrame.setVisible(false);
            dispose();
//            dispose();
//            JFrame jFrame1 = new JFrame("新窗口");
//            jFrame1.setVisible(true);
            BookManege book = new BookManege();
            book.addBook();
        } else if (e.getSource() == jButton2) {
            jFrame.setVisible(false);
            dispose();
            BookManege book = new BookManege();
            book.DeleteBook();


        }
    }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DataBase1 extends DataBaseConnect {
    private DataBaseConnect connect = new DataBaseConnect();

    //判断书籍是否存在
    public boolean Select(String bookName) throws SQLException, ClassNotFoundException {
        connect.getConnection();
        PreparedStatement sql;
        Connection connection = this.getConnection();
        sql = connection.prepareStatement("select *from library.db_book");
        ResultSet resultSet;
        resultSet = sql.executeQuery();
        int flag = 0;
        while (resultSet.next()) {
            String book = resultSet.getString("BookName");
            if (bookName.equals(book)) {
                flag = 1;
            }
        }
        if (flag == 1)
            return true;
        else
            return false;
    }

    //查找书籍剩余情况
    public int Select(String bookName, int flag) throws SQLException, ClassNotFoundException {
        connect.getConnection();
        PreparedStatement sql;
        Connection connection = this.getConnection();
        sql = connection.prepareStatement("select  *from library.db_book ");
        ResultSet resultSet;
        resultSet = sql.executeQuery();
        int number = 0;
        while (resultSet.next()) {
            String book = resultSet.getString("BookName");
            int bookNumber = resultSet.getInt("BookNumber");
            if (bookName.equals(book))
                number = bookNumber;
        }
        return number;
    }

    //更新图书馆书籍数目
    public void UpDate(String bookName, int flag) throws SQLException, ClassNotFoundException {
        connect.getConnection();
        PreparedStatement sql;
        Connection connection = this.getConnection();
        sql = connection.prepareStatement("update library.db_book set BookNumber=? where BookName=?");
        String number;
        number = String.valueOf(Select(bookName, flag));
        if (flag == 1)
            sql.setInt(1, Integer.parseInt(number) - 1);
        else if (flag == 2)
            sql.setInt(1, Integer.parseInt(number) + 1);
        sql.setString(2, bookName);
        sql.executeUpdate();
    }

    //记得更新借书时间
    public void addBorrowName(String bookName, String borrowName, String borrowTime, String returnTime) throws SQLException, ClassNotFoundException {
        Connection connection = connect.getConnection();
        PreparedStatement sql;
        sql = connection.prepareStatement("insert into library.db_borrow(BookName, BorrowName,BorrowTime,ReturnTime)values (?,?,?,?)");
        sql.setString(1, bookName);
        sql.setString(2, borrowName);
        sql.setString(3, borrowTime);
        sql.setString(4, returnTime);
        sql.executeUpdate();
    }

    //还书记录
    public void returnBook(String borrowName) throws SQLException, ClassNotFoundException {
        Connection connection = connect.getConnection();
        PreparedStatement sql;
        sql = connection.prepareStatement("delete from library.db_borrow where BorrowName=?");
        sql.setString(1, borrowName);
        sql.executeUpdate();
    }

}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;

public class BookManege extends JFrame implements ActionListener {
    private JButton jButton1 = new JButton("增加");
    private JButton jButton2 = new JButton("返回上一级目录");
    private JTextField jTextField1, jTextField2, jTextField3;

    void addBook() {
        this.setTitle("图书管理");
//        JButton jButton1 = new JButton("增加");
        jButton1.addActionListener(this);
//        JButton jButton2 = new JButton("返回上一级目录");
        jButton2.addActionListener(this);

        JLabel jLabel1 = new JLabel("图书名称");
        jTextField1 = new JTextField(15);
        JLabel jLabel2 = new JLabel("图书作者");
        jTextField2 = new JTextField(15);
        JLabel jLabel3 = new JLabel("入库时间");
        jTextField3 = new JTextField(15);

        JPanel jPanelNorth = new JPanel();
        JPanel jPanelCenter1 = new JPanel();
        JPanel jPanelCenter2 = new JPanel();
        JPanel jPanelCenter = new JPanel();
        JPanel jPanelSouth = new JPanel();

//       jPanelNorth.setLayout(new BorderLayout());
        jPanelNorth.add(jLabel1);
        jPanelNorth.add(jTextField1);

        jPanelCenter1.add(jLabel2);
        jPanelCenter1.add(jTextField2);

        jPanelCenter2.add(jLabel3);
        jPanelCenter2.add(jTextField3);

        jPanelCenter.add(jPanelCenter1, BorderLayout.CENTER);
        jPanelCenter.add(jPanelCenter2, BorderLayout.SOUTH);
//       this.add(jPanelNorth,BorderLayout.NORTH);
        jPanelSouth.add(jButton1);
        jPanelSouth.add(jButton2);

        this.add(jPanelNorth, BorderLayout.NORTH);
        this.add(jPanelCenter, BorderLayout.CENTER);
        this.add(jPanelSouth, BorderLayout.SOUTH);
        this.setSize(400, 200);
        this.setVisible(true);

    }

    void DeleteBook() {
        JFrame jFrame = new JFrame("删除图书");
        JButton jButton = new JButton("删除");
        jButton.addActionListener(this);
        JButton jButton1 = new JButton("返回上一级目录");
        jButton1.addActionListener(this);
        JLabel jLabel = new JLabel("书籍名称");
        JTextField jTextField = new JTextField(15);
        JPanel jPanel = new JPanel();
        JPanel jPanel1 = new JPanel();
        jPanel1.add(jButton);
        jPanel1.add(jButton1);
        jPanel.add(jLabel);
        jPanel.add(jTextField);
        this.add(jPanel, BorderLayout.NORTH);
        this.add(jPanel1, BorderLayout.CENTER);
        setVisible(true);
        setSize(500, 400);
        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String bookName;
                bookName = jTextField.getText();
                DataBaseConnect connect = new DataBaseConnect();
                try {
                    boolean result = connect.SelectBook(bookName);
                    if (result) {
                        connect.DeleteBook(bookName);
                        JOptionPane.showMessageDialog(jFrame, "删除成功");
                    } else {
                        JOptionPane.showMessageDialog(jFrame, "图书馆没有书籍信息");
                    }
                } catch (SQLException | ClassNotFoundException ex) {
                    ex.printStackTrace();
                }
            }
        });
        jButton1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                setVisible(false);
                dispose();
                new MenuJFrame();
            }
        });
    }

    //增加图书监听器
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == jButton1) {
            //增加书到数据库db_Book
            String bookName, bookAuthor, bookTime;
            bookName = jTextField1.getText();
            bookAuthor = jTextField2.getText();
            bookTime = jTextField3.getText();
            DataBaseConnect connect = new DataBaseConnect();
            try {
                String s = connect.AddBook(bookName, bookAuthor, bookTime, 1);
                JOptionPane.showMessageDialog(this, s);
            } catch (SQLException | ClassNotFoundException ex) {
                ex.printStackTrace();
            }

        } else if (e.getSource() == jButton2) {
            setVisible(false);
            dispose();
            new MenuJFrame();
        }
    }

//    public boolean Select(String bookName) {
//
//        return true;
//    }

    public static void main(String[] args) {
        BookManege book = new BookManege();
//        book.addBook();
        book.DeleteBook();
    }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;

public class ReturnBook extends JFrame implements ActionListener {
    public void returnBook() {
        JFrame returnJFrame = new JFrame("还书");
        JPanel jPanelNorth = new JPanel(), jPanelCenter = new JPanel(), jPanelSouth = new JPanel(), jPanel = new JPanel();
        JPanel jPanelCenter1 = new JPanel(), jPanel1Center2 = new JPanel();
        JButton jButton = new JButton("还书");
        JButton jButton1 = new JButton("返回上一级目录");

        JLabel jLabel1 = new JLabel("书籍名称：");
        JTextField jTextField1 = new JTextField(15);
        jPanelNorth.add(jLabel1);
        jPanelNorth.add(jTextField1);

        JLabel jLabel2 = new JLabel("还书人：");
        JTextField jTextField2 = new JTextField(15);
        jPanelCenter1.add(jLabel2);
        jPanelCenter1.add(jTextField2);

        JLabel jLabel3 = new JLabel("归还时间：");
        JTextField jTextField3 = new JTextField(15);
        jPanel1Center2.add(jLabel3);
        jPanel1Center2.add(jTextField3);
        jPanelCenter.add(jPanelCenter1, BorderLayout.NORTH);
        jPanelCenter.add(jPanel1Center2, BorderLayout.CENTER);

        jPanelSouth.add(jButton);
        jPanelSouth.add(jButton1);

        returnJFrame.add(jPanelNorth, BorderLayout.NORTH);
        returnJFrame.add(jPanelCenter, BorderLayout.CENTER);
        returnJFrame.add(jPanelSouth, BorderLayout.SOUTH);
        returnJFrame.setSize(500, 200);
        returnJFrame.setLocation(500, 500);
        returnJFrame.setResizable(false);
        returnJFrame.setVisible(true);
        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String bookName = jTextField1.getText();
                String borrowName = jTextField2.getText();
                String borrowTime = jTextField3.getText();
                DataBase1 dataBase1 = new DataBase1();
                try {
                    dataBase1.returnBook(borrowName);
                    dataBase1.UpDate(bookName, 2);
                    JOptionPane.showMessageDialog(returnJFrame, "还书成功！");
                } catch (SQLException | ClassNotFoundException ex) {
                    ex.printStackTrace();
                }
            }
        });
        jButton1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                returnJFrame.setVisible(false);
                dispose();
                new MenuJFrame();
            }
        });


    }

    @Override
    public void actionPerformed(ActionEvent e) {

    }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class userDateBase extends DataBaseConnect {
    DataBaseConnect dataBaseConnect = new DataBaseConnect();
    private Connection connection;
    private PreparedStatement sql;
    private ResultSet resultSet;

    public boolean Select(String username) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        sql = connection.prepareStatement("select *from library.db_账户");
        int flag = 0;
        try {
            resultSet = sql.executeQuery();
            while (resultSet.next()) {
                String user = resultSet.getString("username");
                if (user.equals(username))
                    flag = 1;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (flag == 0)
            return true;
        else
            return false;
    }

    public boolean Insert(String user, String date, String email) throws SQLException, ClassNotFoundException {
        connection = this.getConnection();
        boolean result = Select(user);
        if (result) {
            sql = connection.prepareStatement("insert into library.db_userinformation(username, birthday, Email) values (?,?,?)");
            sql.setString(1, user);
            sql.setString(2, date);
            sql.setString(3, email);
            sql.executeUpdate();
            return true;
        } else {
            return false;
        }
    }

}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;

public class UserInformation extends JFrame implements ActionListener {
    Login login = new Login();
    String user = login.getUser();
    String password = login.getPassWord();
    private JFrame userJFrame = new JFrame("个人信息");
    private JLabel jLabel1 = new JLabel("用户名：");
    private JTextField jTextField1 = new JTextField(user, 15);
    private JLabel jLabel2 = new JLabel("出生日期：");
    private JTextField jTextField2 = new JTextField(15);
    private JLabel jLabel3 = new JLabel("电子邮件：");
    private JTextField jTextField3 = new JTextField(15);
    private JPanel jPanel;
    private JButton jButton1 = new JButton("提交");
    private JButton jButton2 = new JButton("返回主菜单");

    //    Login login=new Login();
    public void Information() {
        Init();
//        String user = login.getUser();
//        String password = login.getPassWord();
        JPanel jPanelNorth = new JPanel();
        jPanelNorth.add(jLabel1);
        jPanelNorth.add(jTextField1);
        userJFrame.add(jPanelNorth, BorderLayout.NORTH);

        JPanel jPanelCenter1 = new JPanel();
        jPanelCenter1.add(jLabel2);
        jPanelCenter1.add(jTextField2);
        JPanel jPanelCenter = new JPanel();
        jPanelCenter.add(jPanelCenter1, BorderLayout.NORTH);
        JPanel jPanelCenter2 = new JPanel();
        jPanelCenter2.add(jLabel3);
        jPanelCenter2.add(jTextField3);
        jPanelCenter.add(jPanelCenter2, BorderLayout.SOUTH);
        userJFrame.add(jPanelCenter, BorderLayout.CENTER);

        JPanel jPanelSouth = new JPanel();
        jPanelSouth.add(jButton1);
        jPanelSouth.add(jButton2);
        userJFrame.add(jPanelSouth, BorderLayout.SOUTH);

        jButton1.addActionListener((ActionListener) this);
        jButton2.addActionListener((ActionListener) this);
        jButton1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = jTextField1.getText();
                String data = jTextField2.getText();
                String email = jTextField3.getText();
                userDateBase userDateBase = new userDateBase();
                try {
                    boolean result = userDateBase.Insert(username, data, email);
                    if (result) {
                        JOptionPane.showMessageDialog(userJFrame, "修改成功");
                    } else {
                        JOptionPane.showMessageDialog(userJFrame, "该用户名已经存在,请修改用户名");
                    }
                } catch (SQLException ex) {
                    ex.printStackTrace();
                } catch (ClassNotFoundException ex) {
                    ex.printStackTrace();
                }
            }
        });
        jButton2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                userJFrame.setVisible(false);
                dispose();
                MenuJFrame menuJFrame = new MenuJFrame();
            }
        });
    }

    public void Init() {
        userJFrame.setSize(400, 200);
        userJFrame.setLocation(500, 500);
        userJFrame.setVisible(true);
        userJFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    }

    public static void main(String[] args) {
        UserInformation userInformation = new UserInformation();
        userInformation.Information();
    }

    @Override
    public void actionPerformed(ActionEvent e) {

    }
}

也不知道有没有贴完，因为是个联系所以烂尾了