如何在JFormattedTextField中禁止字符？

Question

In NetBeans, how can I setup invalid characters for JFormattedTextField so that it does not allow: | , [ , ] and etc.?

Never mind, I figured out the solution:

MaskFormatter formatter = null;

        try {
            //# - Any valid number, uses Character.isDigit.
            //' - Escape character, used to escape any of the special formatting characters.
            //U - Any character (Character.isLetter). All lowercase letters are mapped to upper case.
            //L - Any character (Character.isLetter). All upper case letters are mapped to lower case.
            //A - Any character or number (Character.isLetter or Character.isDigit)
            //? - Any character (Character.isLetter).
            //* - Anything.
            //H - Any hex character (0-9, a-f or A-F).
            formatter = new MaskFormatter("******************************");
            formatter.setInvalidCharacters("|[]");
        } catch (java.text.ParseException ex) {
        }

then, on the GUI right click on the JFormattedTextField, click on Customize Code, for the dropdown box beside myFormattedTextField = new javax.swing.JFormattedTextField(); select custom creation and add formatter to JFormattedTextField as following: myFormattedTextField = new javax.swing.JFormattedTextField(formatter);

Hope this will help somebody else one day.

Answer 1

most confortable way is add DocumentListener and there Pattern , valur to the JFormattedTextField could inseted (block of chars) or added char by char, I suggest to override both methods

insertUpdate()

changedUpdate()//Plain text components don't fire these events.

for inserted block of chars would be better implements Pattern p = Pattern.compile("decision char filtering") directly