how to use difference message resource file in ActionMessage

Hi, everyone, I am use the struts version 1. now I have a question about the class ActionMessage: if I had configurated more than one message resources in struts-config.xml, and I had use difference key for mark them. but In my action, I want to use ActionMessage for some message, how to do fo

how to use difference resource file in Class ActionMessage

Hi, one question about the Class ActionMessage, how to use the difference resource file in Class ActionMessage? example: I have to resource file, one is the default for struts configuration, secondly had used a bundle key. so, how to use that message resource file in Class ActionMessage? thanks