1

我使用这种方法来更改表格单元格的值，它在 jtable 上更改，但在文本文件上没有更改！

public class user_AllBooks extends AbstractTableModel {

    BookInformation book_info = new BookInformation();
    String[] columns = new String[]{"Book Name", "Book Date", "Book ID", "Borrow Status"};
    ArrayList<BookInformation> bData = new ArrayList<BookInformation>();

    public user_AllBooks() {
        try {
            BufferedReader br = new BufferedReader(new FileReader("AllBookRecords.txt"));
            String line;
            while ((line = br.readLine()) != null) {
                bData.add(initializeBookData(line));
            }
            br.close();
        } catch (IOException ioe) {
        }
    }

    public BookInformation initializeBookData(String myline) {
        BookInformation book_infos = new BookInformation();
        String[] celledLine = myline.split("     ");
        book_infos.setBookName(celledLine[0]);
        book_infos.setBookDate(celledLine[1]);
        book_infos.setBookID(celledLine[2]);
        book_infos.setBorrowStatus(celledLine[3]);
        return book_infos;
    }

    @Override
    public String getColumnName(int col) {
        return columns[col];
    }

    @Override
    public int getRowCount() {
        if (bData != null) {
            return bData.size();
        } else {
            return 0;
        }
    }

    @Override
    public int getColumnCount() {
        return columns.length;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        BookInformation bookInf = bData.get(rowIndex);
        Object value;

        switch (columnIndex) {
            case 0:
                value = bookInf.getBookName();
                break;
            case 1:
                value = bookInf.getBookDate();
                break;
            case 2:
                value = bookInf.getBookID();
                break;
            case 3:
                value = bookInf.getBorrowStatus();
                break;
            default:
                value = "...";
        }
        return value;
    }


    @Override
  public void setValueAt(Object value, int row, int col)
    {
    BookInformation book_infos = bData.get(row);
    if (col==0)
    book_infos.setBookName((String)value);
    else if (col==1)
    book_infos.setBookDate((String)value);
    else if (col==2)
    book_infos.setBookID((String)value);
    else if (col==3)
    book_infos.setBorrowStatus((String)value);
    }
    }

二等：

public class user_AllBooksM extends JFrame implements ActionListener {

    user_AllBooks uAllBooks = new user_AllBooks();
    final JTable bTable = new JTable(uAllBooks);
    JButton borrowButton;

    public user_AllBooksM() {
        setTitle("All Books");
        exitButton = new JButton("Exit");
        borrowButton = new JButton("Borrow");
        borrowButton.addActionListener(this);
        JPanel Bpanel = new JPanel();
        Bpanel.setLayout(new FlowLayout());
        JScrollPane sp = new JScrollPane(bTable);
        Bpanel.add(sp);
        Bpanel.add(borrowButton);
        this.add(Bpanel);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setBounds(300, 60, 550, 550);
        this.setResizable(false);
        this.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent event) {
        borrowInitialize(bTable.getSelectedRow());
    }

    public void borrowInitialize(int row) {
        if (uAllBooks.getValueAt(row, 3).equals("yes")) {
            JOptionPane.showMessageDialog(null, "This Book Was Borrowed");
        } else {
            uAllBooks.setValueAt("Yes", row, 3);
            uAllBooks.fireTableRowsUpdated(row, row);
        }
    }

    public static void main(String[] args) {
        new user_AllBooksM();
    }
}

我的文本文件：

sds wew     88     77     no
moon     889     988     yes
ccc     30     33     no
testing     76     77     no
yes     999     444     no
hoop     100     200     no
name     60     20     no
pp     14     15     no
vbnet     49     94     yes
sdsd     232     dsds     no
gh     12     21     no
khoyBook     322     233     no
4

2 回答 2

4

将 TableModelListener 添加到您的 TableModel。然后，每当更新事件首先出现时，您都需要遍历 TableModel 的行/列并重新创建文本文件。

您的 TableModel 实施不正确。您尚未实现 setValueAt(...) 方法。

应该从 TableModel 的 setValueAt() 方法调用“fireTableRowsUpdated()”方法。不应从您的 ActionListener 代码中调用它。

于 2013-02-12T19:39:15.920 回答
2

要在更改单元格值时更改文件的内容，您应该将 注册TableModelListener到关联的TableModel. 并在方法中实现文件写入逻辑tableChanged。
这是演示如何实现的示例代码TableModelListener。我希望这将为您提供一个很好的视角来完成您的任务：

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelListener;
import javax.swing.event.TableModelEvent;
import javax.swing.table.TableModel;
import javax.swing.table.AbstractTableModel;
class TableDemo extends JFrame  implements TableModelListener
{
    private JTable table;
    private JScrollPane jsPane;
    private TableModel myModel;
    private JLabel label;
    public void prepareAndShowGUI()
    {
        myModel = new MyModel();
        table = new JTable(myModel);
        jsPane = new JScrollPane(table);
        label = new JLabel();
        myModel.addTableModelListener(this);
        getContentPane().add(jsPane);
        getContentPane().add(label,BorderLayout.SOUTH);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }
    @Override
    public void tableChanged ( TableModelEvent evt)
    {
        int row = evt.getFirstRow();
        int col = evt.getColumn();
        label.setText("Value at ["+row+"]["+col+"] is changed to: "+myModel.getValueAt(row,col));
           //Write to your file here.
    }
    private class MyModel extends AbstractTableModel 
    {
        String[] columns = {
                            "Roll No.",
                            "Name"
                            };
        String[][] inData = {
                                {"1","Anthony Hopkins"},
                                {"2","James William"},
                                {"3","Mc. Donald"}
                            };
        @Override
        public void setValueAt(Object value, int row, int col)
        {
            inData[row][col] = (String)value;
            fireTableCellUpdated(row,col);
        }
        @Override
        public Object getValueAt(int row, int col)
        {
            return inData[row][col];
        }
        @Override
        public int getColumnCount()
        {
            return columns.length;
        }
        @Override 
        public int getRowCount()
        {
            return inData.length;
        }
        @Override
        public String getColumnName(int col)
        {
            return columns[col];
        }
        @Override 
        public boolean isCellEditable(int row, int col)
        {
            return true;
        }
    }
    public static void main(String st[])
    {
        SwingUtilities.invokeLater( new Runnable()
        {
            @Override
            public void run()
            {
                TableDemo td = new TableDemo();
                td.prepareAndShowGUI();
            }
        });
    }
}
于 2013-02-13T19:17:30.443 回答