setContentType() for xml output

I need to send a string which represents a xml file to browser, I need to call response.setContentType(text/xml). But it is at ActionServlet level and is default to text/html. 1. Any idea? 2. I can do the output at MyAction.perform() level, but how to handle the return type of this method?

output xml file

I need to send a string which represents a xml file to browser, I need to call response.setContentType(text/xml). But it is at ActionServlet level and is default to text/html. 1. Any idea? 2. I can do the output at MyAction.perform(, request, response, ) level, but how to handle the return type