如何自定义格式化JFormattedTextField以显示IP地址？

Question

I have been trying to custom JFormattedTextField to display a mask for entering an IP address.

I read javadoc, and I tried with ###.###.###.### , but it's not valid in many cases.

I found some article for this, they use Regex to format value but they don't display a mask for entering an IP.

I want to display 3 dots in text field to display IP address. Like this:

 .   .   .

I can input a IP Address in many cases. You can see in IPv4 configuration in Windows.

 .   .   .

Can you help me? Thanks for reading

Answer 1

I know this won't help you with your homework, but for other people looking for a solution: Jidesoft Grids (I am not affiliated) has a class for this: com.jidesoft.field.IPTextField .

Generally, I think it will be difficult to achieve a satisfactory solution with JFormattedTextField.

Answer 2

You could try four JFormattedTextField in a row, each separated by a JLabel(".") . With the dot out of the way, that might make the number format easier to get right.