Struts 2中return语句之间的区别

Question

What is the difference between returning a SUCCESS and Action.SUCCESS for your execute method in struts 2? I know about returning a SUCCESS string, but I couldn't figure the Action.SUCCESS one?

Answer 1

Take a look on source code of Action :

public static final String SUCCESS = "success";

I think that this line explains better than any words that Action.SUCCESS and string constant "success" are the same.

Answer 2

Action.SUCCESS is a String constant defined in the Action interface. see here

It will be available in all your Action classes that implement this interface. Your own action classes inherit this constant.

So there is practically no difference between Action.SUCCESS and SUCCESS inside a class that implements Action .

Answer 3

They are the same if point to the same constant in Action class. But to use the first case required either the action class to implement the Action interface better with extending the ActionSupport which implements the Action interface or use static imports. The second case is the usual way to access static resources.

Answer 4

They are both string mapped to "success" string.

public interface Action {

    /**
     * The action execution was successful. Show result
     * view to the end user.
     */
    public static final String SUCCESS = "success";