...
Of course, applications can define other result tokens to match specific cases.
Returning ActionSupport.NONE
from an Action class method causes the results processing to be skipped. This is useful if the action fully handles the result processing such as writing directly to the HttpServletResponse OutputStream.
Result Elements
The result element has two jobs. First, it provides a logical name. An Action
can pass back a token like "success" or "error" without knowing any other implementation details. Second, the result element provides a result type. Most results simply forward to a server page or template, but other Result Types can be used to do more interesting things.
...