Setting default fmt formatNumber maxFractionDigits

问题:

Is it possible to have the following tag always display 5 decimal places?

<fmt:formatNumber type="currency" value="${number}" />

without having to change it to

<fmt:formatNumber type="currency" maxFractionDigits="5" value="${number}" />

basically I have so many of these and I want them all to change, I want 5 decimal places to be the default.

回答1:

Yes. You cam implement this by extending fmt:formatNumber functionality.

For this, create a class extending org.apache.taglibs.standard.tag.rt.fmt.FormatNumberTag to set maxFractionDigits to 5 by default (when not supplied).

You would also need to change the reference in your fmt tag library descriptor (tld) file to point to your own implementation.

These should be present in your jstl jar located in WEB-INF\lib by default .

EDIT: Personally, I would go for Adeel's approach of setting up a custom locale, if at all possible.

回答2:

Direct answer is No, if its of less effort then you can set 5 decimal value only in number at servlet

回答3:

You might be able to set a custom Locale, which does nothing but override double formatting, for the application. In this way you just need to do it in one place.

回答4:

That's not possible, no. But you can install/use a text editor which has kind of a Find And Replace In All Files function. Editplus for example. I believe Notepad++ is also able to.

Assuming Editplus, just open all JSP files in the editor. Hit Ctrl+H. Fill in the following

Find what: <fmt:formatNumber type="currency" value
Replace with: <fmt:formatNumber type="currency" maxFractionDigits="5" value

Click the All open files option in Replace all range and then click Replace All.

That's it.

Choose File > Save All to save them all. Press if necessary F5 to refresh your Eclipse/Netbeans/whatever project to refresh the files.