about using the Actioninvocation object in interceptor in Struts2 to obtain the encapsulated parameters in the HttpServletRequest, in the form of a map

Public String Intercept (Actioninvocation arg0) throws Exception
{

First returns the Actioncontext object using its GetParameters () method to obtain the map object. The map object encapsulates the request parameters of the HttpServletRequest object.

Map map = Arg0.getinvocationcontext (). GetParameters ();

String[] username = (string[]) map.get ("username"); But the real type here is the string[] array type, and now it's more generic to return the form of the string[array type.

string[] Password = (string[]) map.get ("password");

System.out.println (Username[0]);

System.out.println (Password[0]);

This is the code snippet.