• 日期: 2028-03-03
  • 标签: 常规

Java案例7-4升级版日记本：多用户、分类、标签、搜索、导出、打印、评论、分享

升级版日记本要求实现以下功能：

  1. 支持多用户登录和注册，每个用户有自己的日记本。

  2. 支持对日记进行分类和标签。

  3. 支持对日记进行搜索和排序，可以按照时间、标题、分类、标签等进行排序。

  4. 支持导出日记为文本文件或者打印出来。

  5. 支持对已有日记进行修改和删除。

  6. 支持设置日记本的密码保护。

  7. 支持对日记的评论和回复。

  8. 支持对日记进行分享到社交网络。

实现思路：

  1. 使用Java Swing进行界面设计，使用MySQL数据库进行数据存储。

  2. 用户登录和注册使用JDBC连接数据库进行验证和保存数据。

  3. 日记的分类和标签使用JComboBox进行选择和编辑，使用JTextField进行输入和保存。

  4. 日记的搜索和排序使用JTable显示日记数据，使用JTextField进行搜索和JComboBox进行排序，使用JFileChooser进行导出和打印。

  5. 日记的修改和删除使用JOptionPane进行提示和确认，使用JTextField进行修改和JTable进行删除。

  6. 日记本的密码保护使用JPasswordField进行密码输入和验证。

  7. 日记的评论和回复使用JTextArea进行输入和显示，使用JButton进行保存和回复。

  8. 日记的分享使用JOptionPane进行提示和选择，使用JFileChooser进行选择和保存。

代码实现：

1. 用户登录和注册

//登录界面
JLabel nameLabel = new JLabel('用户名：');
JTextField nameField = new JTextField(10);
JLabel passLabel = new JLabel('密码：');
JPasswordField passField = new JPasswordField(10);
JButton loginButton = new JButton('登录');
JButton registerButton = new JButton('注册');

//登录按钮
loginButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        String name = nameField.getText();
        String pass = String.valueOf(passField.getPassword());
        if (name.equals('') || pass.equals('')) {
            JOptionPane.showMessageDialog(null, '用户名或密码不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            boolean flag = checkUser(name, pass);
            if (flag) {
                JOptionPane.showMessageDialog(null, '登录成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
                //打开日记界面并关闭登录界面
                new DiaryFrame(name).setVisible(true);
                LoginFrame.this.dispose();
            } else {
                JOptionPane.showMessageDialog(null, '用户名或密码错误！', '提示', JOptionPane.WARNING_MESSAGE);
            }
        }
    }
});

//注册按钮
registerButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        String name = nameField.getText();
        String pass = String.valueOf(passField.getPassword());
        if (name.equals('') || pass.equals('')) {
            JOptionPane.showMessageDialog(null, '用户名或密码不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            boolean flag = addUser(name, pass);
            if (flag) {
                JOptionPane.showMessageDialog(null, '注册成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
            } else {
                JOptionPane.showMessageDialog(null, '用户名已存在！', '提示', JOptionPane.WARNING_MESSAGE);
            }
        }
    }
});

//登录验证
public boolean checkUser(String name, String pass) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'select * from user where name=? and pass=?';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, name);
        pstmt.setString(2, pass);
        ResultSet rs = pstmt.executeQuery();
        if (rs.next()) {
            flag = true;
        }
        rs.close();
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

//注册保存
public boolean addUser(String name, String pass) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'insert into user(name, pass) values(?,?)';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, name);
        pstmt.setString(2, pass);
        int count = pstmt.executeUpdate();
        if (count > 0) {
            flag = true;
        }
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

2. 日记的分类和标签

//分类下拉框
String[] types = {'旅行', '工作', '生活', '学习'};
JComboBox<String> typeBox = new JComboBox<>(types);
typeBox.setSelectedIndex(0);
typeBox.setEditable(true);
typeBox.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        String type = (String) typeBox.getSelectedItem();
        if (!Arrays.asList(types).contains(type)) {
            typeBox.addItem(type);
        }
    }
});

//标签输入框
JLabel tagLabel = new JLabel('标签：');
JTextField tagField = new JTextField(20);

//保存按钮
JButton saveButton = new JButton('保存');
saveButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        String title = titleField.getText();
        String content = contentArea.getText();
        String type = (String) typeBox.getSelectedItem();
        String tag = tagField.getText();
        if (title.equals('') || content.equals('')) {
            JOptionPane.showMessageDialog(null, '标题或内容不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            boolean flag = addDiary(title, content, type, tag);
            if (flag) {
                JOptionPane.showMessageDialog(null, '保存成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
            } else {
                JOptionPane.showMessageDialog(null, '保存失败！', '提示', JOptionPane.WARNING_MESSAGE);
            }
        }
    }
});

//保存日记
public boolean addDiary(String title, String content, String type, String tag) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'insert into diary(title, content, type, tag) values(?,?,?,?)';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, title);
        pstmt.setString(2, content);
        pstmt.setString(3, type);
        pstmt.setString(4, tag);
        int count = pstmt.executeUpdate();
        if (count > 0) {
            flag = true;
        }
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

3. 日记的搜索和排序

//搜索框
JLabel searchLabel = new JLabel('搜索：');
JTextField searchField = new JTextField(20);
searchField.getDocument().addDocumentListener(new DocumentListener() {
    public void insertUpdate(DocumentEvent e) {
        searchDiary();
    }
    public void removeUpdate(DocumentEvent e) {
        searchDiary();
    }
    public void changedUpdate(DocumentEvent e) {
        searchDiary();
    }
});

//排序下拉框
String[] sorts = {'时间', '标题', '分类', '标签'};
JComboBox<String> sortBox = new JComboBox<>(sorts);
sortBox.setSelectedIndex(0);
sortBox.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        sortDiary();
    }
});

//搜索日记
public void searchDiary() {
    String keyword = searchField.getText();
    String sql = 'select * from diary where title like '%' + keyword + '%' or content like '%' + keyword + '%' or type like '%' + keyword + '%' or tag like '%' + keyword + '%'';
    showDiary(sql);
}

//排序日记
public void sortDiary() {
    String sort = (String) sortBox.getSelectedItem();
    String sql = '';
    if (sort.equals('时间')) {
        sql = 'select * from diary order by time desc';
    } else if (sort.equals('标题')) {
        sql = 'select * from diary order by title asc';
    } else if (sort.equals('分类')) {
        sql = 'select * from diary order by type asc';
    } else if (sort.equals('标签')) {
        sql = 'select * from diary order by tag asc';
    }
    showDiary(sql);
}

//显示日记
public void showDiary(String sql) {
    DefaultTableModel model = new DefaultTableModel();
    model.addColumn('ID');
    model.addColumn('时间');
    model.addColumn('标题');
    model.addColumn('分类');
    model.addColumn('标签');
    model.addColumn('内容');
    try {
        Connection conn = getConnection();
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            Object[] row = new Object[6];
            row[0] = rs.getInt('id');
            row[1] = rs.getString('time');
            row[2] = rs.getString('title');
            row[3] = rs.getString('type');
            row[4] = rs.getString('tag');
            row[5] = rs.getString('content');
            model.addRow(row);
        }
        rs.close();
        stmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    table.setModel(model);
}

4. 导出日记和打印日记

//导出按钮
JButton exportButton = new JButton('导出');
exportButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        chooser.setDialogTitle('导出日记');
        chooser.setApproveButtonText('导出');
        chooser.setFileFilter(new FileFilter() {
            public boolean accept(File f) {
                return f.getName().toLowerCase().endsWith('.txt') || f.isDirectory();
            }
            public String getDescription() {
                return '文本文件(*.txt)';
            }
        });
        int result = chooser.showSaveDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = chooser.getSelectedFile();
            if (!file.getName().toLowerCase().endsWith('.txt')) {
                file = new File(file.getAbsolutePath() + '.txt');
            }
            if (file.exists()) {
                int option = JOptionPane.showConfirmDialog(null, '文件已存在，确定要覆盖吗？', '提示', JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
                if (option == JOptionPane.NO_OPTION) {
                    return;
                }
            }
            boolean flag = exportDiary(file);
            if (flag) {
                JOptionPane.showMessageDialog(null, '导出成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
            } else {
                JOptionPane.showMessageDialog(null, '导出失败！', '提示', JOptionPane.WARNING_MESSAGE);
            }
        }
    }
});

//打印按钮
JButton printButton = new JButton('打印');
printButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        try {
            table.print();
        } catch (PrinterException ex) {
            ex.printStackTrace();
        }
    }
});

//导出日记
public boolean exportDiary(File file) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery('select * from diary');
        FileWriter writer = new FileWriter(file);
        while (rs.next()) {
            String id = rs.getString('id');
            String time = rs.getString('time');
            String title = rs.getString('title');
            String type = rs.getString('type');
            String tag = rs.getString('tag');
            String content = rs.getString('content');
            writer.write(id + '	' + time + '	' + title + '	' + type + '	' + tag + '	' + content + '\n');
        }
        writer.close();
        rs.close();
        stmt.close();
        conn.close();
        flag = true;
    } catch (SQLException | IOException e) {
        e.printStackTrace();
    }
    return flag;
}

5. 日记的修改和删除

//修改按钮
JButton editButton = new JButton('修改');
editButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        int row = table.getSelectedRow();
        if (row == -1) {
            JOptionPane.showMessageDialog(null, '请选择要修改的日记！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            int id = (int) table.getValueAt(row, 0);
            String title = (String) table.getValueAt(row, 2);
            String content = (String) table.getValueAt(row, 5);
            String type = (String) table.getValueAt(row, 3);
            String tag = (String) table.getValueAt(row, 4);
            DiaryDialog dialog = new DiaryDialog(DiaryFrame.this, '修改日记', true, id, title, content, type, tag);
            dialog.setVisible(true);
        }
    }
});

//删除按钮
JButton deleteButton = new JButton('删除');
deleteButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        int row = table.getSelectedRow();
        if (row == -1) {
            JOptionPane.showMessageDialog(null, '请选择要删除的日记！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            int option = JOptionPane.showConfirmDialog(null, '确定要删除吗？', '提示', JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
            if (option == JOptionPane.YES_OPTION) {
                int id = (int) table.getValueAt(row, 0);
                boolean flag = deleteDiary(id);
                if (flag) {
                    JOptionPane.showMessageDialog(null, '删除成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
                } else {
                    JOptionPane.showMessageDialog(null, '删除失败！', '提示', JOptionPane.WARNING_MESSAGE);
                }
            }
        }
    }
});

//修改日记对话框
public class DiaryDialog extends JDialog {
    private int id;
    private JTextField titleField;
    private JTextArea contentArea;
    private JComboBox<String> typeBox;
    private JTextField tagField;

    public DiaryDialog(Frame owner, String title, boolean modal, int id, String titleText, String contentText, String typeText, String tagText) {
        super(owner, title, modal);
        this.id = id;
        JLabel titleLabel = new JLabel('标题：');
        titleField = new JTextField(20);
        titleField.setText(titleText);
        JLabel contentLabel = new JLabel('内容：');
        contentArea = new JTextArea(20, 40);
        JScrollPane contentPane = new JScrollPane(contentArea);
        contentArea.setText(contentText);
        JLabel typeLabel = new JLabel('分类：');
        String[] types = {'旅行', '工作', '生活', '学习'};
        typeBox = new JComboBox<>(types);
        typeBox.setSelectedItem(typeText);
        typeBox.setEditable(true);
        typeBox.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String type = (String) typeBox.getSelectedItem();
                if (!Arrays.asList(types).contains(type)) {
                    typeBox.addItem(type);
                }
            }
        });
        JLabel tagLabel = new JLabel('标签：');
        tagField = new JTextField(20);
        tagField.setText(tagText);
        JButton saveButton = new JButton('保存');
        saveButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String title = titleField.getText();
                String content = contentArea.getText();
                String type = (String) typeBox.getSelectedItem();
                String tag = tagField.getText();
                if (title.equals('') || content.equals('')) {
                    JOptionPane.showMessageDialog(null, '标题或内容不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
                } else {
                    boolean flag = updateDiary(id, title, content, type, tag);
                    if (flag) {
                        JOptionPane.showMessageDialog(null, '保存成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
                        DiaryDialog.this.dispose();
                        showDiary('select * from diary');
                    } else {
                        JOptionPane.showMessageDialog(null, '保存失败！', '提示', JOptionPane.WARNING_MESSAGE);
                    }
                }
            }
        });
        JPanel panel = new JPanel();
        panel.add(titleLabel);
        panel.add(titleField);
        panel.add(contentLabel);
        panel.add(contentPane);
        panel.add(typeLabel);
        panel.add(typeBox);
        panel.add(tagLabel);
        panel.add(tagField);
        panel.add(saveButton);
        this.add(panel);
        this.pack();
        this.setLocationRelativeTo(null);
    }
}

//修改日记
public boolean updateDiary(int id, String title, String content, String type, String tag) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'update diary set title=?, content=?, type=?, tag=? where id=?';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, title);
        pstmt.setString(2, content);
        pstmt.setString(3, type);
        pstmt.setString(4, tag);
        pstmt.setInt(5, id);
        int count = pstmt.executeUpdate();
        if (count > 0) {
            flag = true;
        }
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

//删除日记
public boolean deleteDiary(int id) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'delete from diary where id=?';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, id);
        int count = pstmt.executeUpdate();
        if (count > 0) {
            flag = true;
        }
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

6. 日记本的密码保护

//密码输入框
JLabel passLabel = new JLabel('密码：');
JPasswordField passField = new JPasswordField(10);
JButton passButton = new JButton('确定');
passButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        String pass = String.valueOf(passField.getPassword());
        if (pass.equals('')) {
            JOptionPane.showMessageDialog(null, '密码不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            boolean flag = checkPassword(pass);
            if (flag) {
                JOptionPane.showMessageDialog(null, '密码正确！', '提示', JOptionPane.INFORMATION_MESSAGE);
                passDialog.dispose();
            } else {
                JOptionPane.showMessageDialog(null, '密码错误！', '提示', JOptionPane.WARNING_MESSAGE);
            }
        }
    }
});

//检查密码
public boolean checkPassword(String pass) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'select * from user where name=? and pass=?';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, user);
        pstmt.setString(2, pass);
        ResultSet rs = pstmt.executeQuery();
        if (rs.next()) {
            flag = true;
        }
        rs.close();
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

7. 日记的评论和回复

//评论输入框
JLabel commentLabel = new JLabel('评论：');
JTextArea commentArea = new JTextArea(5, 20);
JScrollPane commentPane = new JScrollPane(commentArea);
JButton commentButton = new JButton('评论');
commentButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        int row = table.getSelectedRow();
        if (row == -1) {
            JOptionPane.showMessageDialog(null, '请选择要评论的日记！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            int id = (int) table.getValueAt(row, 0);
            String content = commentArea.getText();
            if (content.equals('')) {
                JOptionPane.showMessageDialog(null, '评论内容不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
            } else {
                boolean flag = addComment(id, content);
                if (flag) {
                    JOptionPane.showMessageDialog(null, '评论成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
                    commentArea.setText('');
                    showComments(id);
                } else {
                    JOptionPane.showMessageDialog(null, '评论失败！', '提示', JOptionPane.WARNING_MESSAGE);
                }
            }
        }
    }
});

//回复按钮
JButton replyButton = new JButton('回复');
replyButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        int row = commentTable.getSelectedRow();
        if (row == -1) {
            JOptionPane.showMessageDialog(null, '请选择要回复的评论！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            int id = (int) commentTable.getValueAt(row, 0);
            String content = commentArea.getText();
            if (content.equals('')) {
                JOptionPane.showMessageDialog(null, '回复内容不能为空！', '提示', JOptionPane.WARNING_MESSAGE);
            } else {
                boolean flag = addReply(id, content);
                if (flag) {
                    JOptionPane.showMessageDialog(null, '回复成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
                    commentArea.setText('');
                    showComments(diaryId);
                } else {
                    JOptionPane.showMessageDialog(null, '回复失败！', '提示', JOptionPane.WARNING_MESSAGE);
                }
            }
        }
    }
});

//保存评论
public boolean addComment(int diaryId, String content) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'insert into comment(diaryId, content) values(?,?)';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, diaryId);
        pstmt.setString(2, content);
        int count = pstmt.executeUpdate();
        if (count > 0) {
            flag = true;
        }
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

//保存回复
public boolean addReply(int commentId, String content) {
    boolean flag = false;
    try {
        Connection conn = getConnection();
        String sql = 'insert into reply(commentId, content) values(?,?)';
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, commentId);
        pstmt.setString(2, content);
        int count = pstmt.executeUpdate();
        if (count > 0) {
            flag = true;
        }
        pstmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return flag;
}

//显示评论
public void showComments(int diaryId) {
    DefaultTableModel model = new DefaultTableModel();
    model.addColumn('ID');
    model.addColumn('评论内容');
    model.addColumn('回复');
    try {
        Connection conn = getConnection();
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery('select * from comment where diaryId=' + diaryId);
        while (rs.next()) {
            Object[] row = new Object[3];
            row[0] = rs.getInt('id');
            row[1] = rs.getString('content');
            row[2] = getReplies(rs.getInt('id'));
            model.addRow(row);
        }
        rs.close();
        stmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    commentTable.setModel(model);
}

//获取回复
private String getReplies(int commentId) {
    StringBuilder replies = new StringBuilder();
    try {
        Connection conn = getConnection();
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery('select * from reply where commentId=' + commentId);
        while (rs.next()) {
            replies.append(rs.getString('content')).append('\n');
        }
        rs.close();
        stmt.close();
        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return replies.toString();
}

8. 日记的分享

//分享按钮
JButton shareButton = new JButton('分享');
shareButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        int row = table.getSelectedRow();
        if (row == -1) {
            JOptionPane.showMessageDialog(null, '请选择要分享的日记！', '提示', JOptionPane.WARNING_MESSAGE);
        } else {
            int id = (int) table.getValueAt(row, 0);
            String title = (String) table.getValueAt(row, 2);
            String content = (String) table.getValueAt(row, 5);
            String type = (String) table.getValueAt(row, 3);
            String tag = (String) table.getValueAt(row, 4);
            String shareContent = '标题：' + title + '\n' + '内容：' + content + '\n' + '分类：' + type + '\n' + '标签：' + tag;
            JFileChooser chooser = new JFileChooser();
            chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
            chooser.setDialogTitle('分享日记');
            chooser.setApproveButtonText('分享');
            chooser.setFileFilter(new FileFilter() {
                public boolean accept(File f) {
                    return f.getName().toLowerCase().endsWith('.txt') || f.isDirectory();
                }
                public String getDescription() {
                    return '文本文件(*.txt)';
                }
            });
            int result = chooser.showSaveDialog(null);
            if (result == JFileChooser.APPROVE_OPTION) {
                File file = chooser.getSelectedFile();
                if (!file.getName().toLowerCase().endsWith('.txt')) {
                    file = new File(file.getAbsolutePath() + '.txt');
                }
                if (file.exists()) {
                    int option = JOptionPane.showConfirmDialog(null, '文件已存在，确定要覆盖吗？', '提示', JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
                    if (option == JOptionPane.NO_OPTION) {
                        return;
                    }
                }
                boolean flag = writeShareContent(file, shareContent);
                if (flag) {
                    JOptionPane.showMessageDialog(null, '分享成功！', '提示', JOptionPane.INFORMATION_MESSAGE);
                } else {
                    JOptionPane.showMessageDialog(null, '分享失败！', '提示', JOptionPane.WARNING_MESSAGE);
                }
            }
        }
    }
});

//写入分享内容
private boolean writeShareContent(File file, String content) {
    boolean flag = false;
    try {
        FileWriter writer = new FileWriter(file);
        writer.write(content);
        writer.close();
        flag = true;
    } catch (IOException e) {
        e.printStackTrace();
    }
    return flag;
}

总结

本案例使用Java Swing、JDBC、MySQL数据库实现了一个功能丰富的日记本应用程序，涵盖了用户管理、日记管理、搜索排序、导出打印、评论回复、分享等功能。开发者可以根据自己的需求进行扩展和修改，以实现更强大的功能。

注意：本案例代码仅供参考，需要根据实际情况进行调整和完善。

Java案例7-4升级版日记本：多用户、分类、标签、搜索、导出、打印、评论、分享

原文地址: https://www.cveoy.top/t/topic/mwTY 著作权归作者所有。请勿转载和采集!

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