你可以使用 DocumentFilter 为了这个。
它允许您在文本插入文档之前进行编辑。

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class DoubleFilter extends DocumentFilter
{
    @Override
    public void insertString(FilterBypass fb, int offset, String text, AttributeSet attributes)
        throws BadLocationException
    {
        replace(fb, offset, 0, text, attributes);
    }

    @Override
    public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attributes)
        throws BadLocationException
    {
        //  In case someone tries to clear the Document by using setText(null)

        if (text == null)
            text = "";

        //  Build the text string assuming the replace of the text is successfull

        Document doc = fb.getDocument();
        StringBuilder sb = new StringBuilder();
        sb.append(doc.getText(0, doc.getLength()));
        sb.replace(offset, offset + length, text);

        if (validReplace(sb.toString()))
            super.replace(fb, offset, length, text, attributes);
        else
            Toolkit.getDefaultToolkit().beep();
    }

    private boolean validReplace(String text)
    {
        //  In case setText("") is used to clear the Document

        if (text.isEmpty())
            return true;

        //  Verify input is a Double

        try
        {
            Double.parseDouble( text );
            return true;
        }
        catch (NumberFormatException e)
        {
            return false;
        }
    }

    private static void createAndShowGUI()
    {
        JTextField textField = new JTextField(10);
        AbstractDocument doc = (AbstractDocument) textField.getDocument();
        doc.setDocumentFilter( new DoubleFilter() );
        textField.setText("123");
        textField.setText("123567");
        textField.setText(null);

        JFrame frame = new JFrame("Integer Filter");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout( new java.awt.GridBagLayout() );
        frame.add( textField );
        frame.setSize(220, 200);
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args) throws Exception
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });

* /

    }

}

它不是你想要的一切，但它应该让你开始。

我的解决方案灵感来自@camickr，并添加了两种方法： getDouble() 以及 setDouble() ```
import javax.swing.;
import javax.swing.text.;
import java.util.regex.Pattern;

public class JDoubleField extends JTextField
{
private static final DocumentFilter doubleFilter = new DocumentFilter()
{
private final Pattern pattern = Pattern.compile("[+-]?(NaN|Infinity|\d*(\.\d*)?((?<=\d\.?)[eE][+-]?\d*)?)");

    @Override
    public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException
    {
        replace(fb, offset, 0, string, attr);
    }

    @Override
    public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException
    {
        if (text == null || pattern.matcher(new StringBuilder(fb.getDocument().getText(0, fb.getDocument().getLength()))
                .replace(offset, offset + length, text))
                .matches())
            super.replace(fb, offset, length, text, attrs);
    }
};

public double getDouble()
{
    try
    {
        return Double.parseDouble(getText());
    } catch (NumberFormatException ignored)
    {
        return Double.NaN;
    }
}

public void setDouble(double num)
{
    setText(String.valueOf(num));
}

public JDoubleField()
{
    this(0);
}

public JDoubleField(double num)
{
    this(String.valueOf(num));
}

public JDoubleField(double num, int columns)
{
    this(String.valueOf(num), columns);
}

public JDoubleField(Document doc, double num, int columns)
{
    this(doc, String.valueOf(num), columns);
}

public JDoubleField(int columns)
{
    this(null, columns);
}

public JDoubleField(String text)
{
    this(text, 0);
}

public JDoubleField(String text, int columns)
{
    this(null, text, columns);
}

public JDoubleField(Document doc, String text, int columns)
{
    super(doc, null, columns);
    ((AbstractDocument) getDocument()).setDocumentFilter(doubleFilter);
    if (text != null)
        setText(text);
}

}