如何禁止JFormattedTextField中的字符?

时间:2011-12-08 17:02:16

标签: java swing netbeans jformattedtextfield

在NetBeans中,如何为JFormattedTextField设置无效字符,以便它不允许:|[]等?

没关系,我找到了解决方案:

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) {
        }

然后,在GUI上右键单击JFormattedTextField,单击Customize Code,在myFormattedTextField = new javax.swing.JFormattedTextField();旁边的下拉框中选择自定义创建,并将格式化程序添加到JFormattedTextField,如下所示:myFormattedTextField = new javax.swing.JFormattedTextField(formatter);

希望有一天能帮助别人。

1 个答案:

答案 0 :(得分:1)

最舒适的方式是添加DocumentListener并且PatternJFormattedTextField的valur可以插入(字符块)或者通过char添加char,我建议覆盖这两种方法

insertUpdate()

changedUpdate()//Plain text components don't fire these events.
对于插入的字符块,

可以更好地直接实现Pattern p = Pattern.compile("decision char filtering")