The return value for Ajax submission and page prompts in struts is null.

@ Override
Public String execute () throws exception {
If ("NONE". Equals (task )){
Httpservletresponse response = servletactioncontext. getresponse ();
Response. setcontenttype ("text/html; charset = GBK ");

Printwriter out = response. getwriter ();
Out. println ("<SCRIPT type = \" text/JavaScript \ "> ");
Out. println ("alert ('response successful! ');");
Out. println ("window. Location. href = '../success. jsp '");
Out. println ("</SCRIPT> ");

// Action does not need the corresponding result view: Ajax request or servlet response
Return none; // "NONE"
}

System. Out. println ("implementaction ");
Return success; // "success"
}