使用编辑器验证表的单元格

Question

我的JTable有一个密码字段编辑器。如果用户单击以编辑另一个字段时文本长度小于8位，我想显示一条错误消息。我已经尝试过焦点监听器。但是它不起作用。请帮助我，因为我刚刚开始使用Java
swing。

class PasswordEditor extends DefaultCellEditor 
{

    TextBox m_passWord = new TextBox(); 
    public PasswordEditor() {
        super(new TextBox());
    }

    @Override
    public Object getCellEditorValue() {

        return this.m_passWord.getText();
    }

    @Override
    public Component getTableCellEditorComponent(JTable table,
            Object value, boolean isSelected, int row, int column) {

        Object fieldValue = value;
        if(null == fieldValue)
            fieldValue = Constants.EMPTY_STRING;

        this.m_passWord.addInputMethodListener(new InputMethodListener() {

            @Override
            public void inputMethodTextChanged(InputMethodEvent event)
            {
                // TODO Auto-generated method stub

            }

            @Override
            public void caretPositionChanged(InputMethodEvent event)
            {
                // TODO Auto-generated method stub

            }
        })
        this.m_passWord.addFocusListener(new FocusListener() {

            @Override
            public void focusLost(FocusEvent e)
            {
                if (!e.isTemporary()) {
                      String content = PasswordEditor.this.m_passWord.getText();
                      System.out.println((content));
                }

            }

            @Override
            public void focusGained(FocusEvent e)
            {
                //TODO init
            }
        });

        this.m_passWord.setEditable(true);
        this.m_passWord.setText(fieldValue.toString());
        return this.m_passWord;
    }


}

Answer 1

覆盖stopCellEditing（）并在其中实现条件。

 class PasswordEditor extends DefaultCellEditor 
{

    TextBox m_passWord = new TextBox(); 
    public PasswordEditor() {
        super(new TextBox());
    }

            @Override
    public boolean stopCellEditing()
    {
        if(getCellEditorValue().toString().length() < 8)
        {
            JOptionPane.showMessageDialog(UsmUserView.this.m_Parent, "Password Must Be 8 Bytes Long !! Please Check");
            return false;
        }
        fireEditingStopped();
        return true;
    }

    @Override
    public Object getCellEditorValue() {

        return this.m_passWord.getText();
    }

    @Override
    public Component getTableCellEditorComponent(JTable table,
            Object value, boolean isSelected, int row, int column) {

        Object fieldValue = value;
        if(null == fieldValue)
            fieldValue = Constants.EMPTY_STRING;

        this.m_passWord.setEditable(true);
        this.m_passWord.setText(fieldValue.toString());
        return this.m_passWord;
    }


}