如何在Struts2中更改默认日期格式？

Question

I am developing a multilingual Struts2 application, and I have quite a few actions which are dealing with Calendar properties. The default type conversion works most of the time, however in some locales I would like to change the default format used.

Specifically I would like to have the dates in English locale to follow the yyyy-MM-dd format. However, this does not work (strangely yyyy-MM-dd HH:mm works fine, but in this case I do not want to have a time part), as Struts2 expect dates in English locale to look different.

So, I would like to change the expected format of the conversion. I am looking for a sane solution for this. The options I have already tried:

• A) Own StrutsTypeConverter . This should work, but I could not inject the format specified in the package.properties file into it.
• B) Changing the getter/setter pair, to use String instead - works, but this is not a sane solution .

How to fix the solution A ? Or is there an alternative approach? Of course, if this can be done entirely in configuration, that would be the best.

Answer 1

Okay, I found a solution for my problem at hand, still, I think this could done in a saner way. Anyway, I am posting my own type converter:

public class DateConverter extends StrutsTypeConverter {

    private DateFormat dateFormat;

    {
        ActionContext ctx = ActionContext.getContext();
        ActionSupport action = (ActionSupport) ctx.getActionInvocation().getAction();
        String formatString = action.getText("dateformat.ui");
        dateFormat = new SimpleDateFormat(formatString);
    }

    public Object convertFromString(Map context, String[] values, Class toClass) {
        String input = values[0];
        try {
            Date date = dateFormat.parse(input);
            Calendar cal = Calendar.getInstance();
            cal.setTime(date);
            return cal;
        } catch (ParseException e) {
            return null;
        }
    }

    public String convertToString(Map context, Object object) {
        Calendar cal = (Calendar) object;
        return dateFormat.format(cal.getTime());
    }

}

I removed the non-essential parts of the code, but this is a working solution.