我有一个 JTable 有两列(可编辑的 JTable)。当用户在第二列输入内容时,我的要求如下:
用户只能输入数字和逗号
当用户输入错误的字符时,它会发出哔声
(Toolkit.getDefaultToolkit().beep();
)
我该如何实现这一目标?(如果是 jtextfield 它需要文档过滤器或纯文档等,如果是 JTable,那么如何?)
我有一个 JTable 有两列(可编辑的 JTable)。当用户在第二列输入内容时,我的要求如下:
用户只能输入数字和逗号
当用户输入错误的字符时,它会发出哔声(Toolkit.getDefaultToolkit().beep();
)
我该如何实现这一目标?(如果是 jtextfield 它需要文档过滤器或纯文档等,如果是 JTable,那么如何?)
实现一个TableCellEditor
能够返回一个文本组件 ( JTextField
),该组件DocumentFilter
附加了一个能够根据需要过滤传入的文本。
你可能想看看
更新示例
如果是jtextfield,它需要文档过滤器或纯文档等,如果是JTable,那么如何?
阅读教程,针对您遇到的问题提出问题。重要的是您要了解为什么事情以某种方式完成,而不是简单地复制和粘贴其他代码,否则您将不知道何时复制了坏主意;)
public class TestFilteredCellEditor {
public static void main(String[] args) {
new TestFilteredCellEditor();
}
public TestFilteredCellEditor() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new FilteredEditorPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class FilteredEditorPane extends JPanel {
public FilteredEditorPane() {
setLayout(new BorderLayout());
JTable table = new JTable(new MyTableModel());
TableColumnModel columnModel = table.getColumnModel();
columnModel.getColumn(1).setCellEditor(new FilteredTableEditor());
add(new JScrollPane(table));
}
}
public class FilteredTableEditor extends AbstractCellEditor implements TableCellEditor {
private JTextField editor;
public FilteredTableEditor() {
editor = new JTextField();
((AbstractDocument) editor.getDocument()).setDocumentFilter(new NumericDocumentFilter());
}
@Override
public boolean isCellEditable(EventObject e) {
return true;
}
@Override
public Object getCellEditorValue() {
return editor.getText();
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
if (value instanceof String) {
editor.setText((String) value);
} else {
editor.setText(null);
}
return editor;
}
}
public class NumericDocumentFilter extends DocumentFilter {
public void insertString(DocumentFilter.FilterBypass fb, int offset,
String string, AttributeSet attr)
throws BadLocationException {
StringBuilder buffer = new StringBuilder(string);
boolean isBad = false;
for (int i = buffer.length() - 1; i >= 0; i--) {
char ch = buffer.charAt(i);
if (!Character.isDigit(ch)) {
buffer.deleteCharAt(i);
isBad = true;
}
}
if (isBad) {
Toolkit.getDefaultToolkit().beep();
}
super.insertString(fb, offset, buffer.toString(), attr);
}
public void replace(DocumentFilter.FilterBypass fb,
int offset, int length, String string, AttributeSet attr) throws BadLocationException {
if (length > 0) {
fb.remove(offset, length);
}
insertString(fb, offset, string, attr);
}
}
public class MyTableModel extends AbstractTableModel {
@Override
public int getRowCount() {
return 1;
}
@Override
public int getColumnCount() {
return 2;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return "";
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return true;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return String.class;
}
}
}