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<s:textfield key="orderItem.price" value="%{getText('format.number',{'orderItem.price'})}" />

This maps to the method signature getText( String key, Object[] params ) in ActionSupport.

Using getFormatted() with conversion support

A new method getFormatted was added to ActionSupport (which can be implemented in your base action) to support formatting and conversion errors with I10N.
You can place a code like below

<s:textfield key="user.born" value="%{getFormatted('format.number','user.born')}" />

to get support for I10N and also to support conversion errors.