Struts2中的ValueStack

Struts2中的ValueStack
<%
 Enumeration em = request.getAttributeNames();
 while(em.hasMoreElements()){
  Object obj = em.nextElement();
  if(obj.equals("struts.valueStack")){
   ValueStack vs = (ValueStack)request.getAttribute("struts.valueStack");
   System.out.println(vs.findValue("username"));
   System.out.println(vs.findValue("password"));
   System.out.println(vs.findValue("[0].username"));
   System.out.println(vs.findValue("[0].password"));
   vs.toString();
  }
 }
 %>

哈哈，原来Struts2在视图里是这样子拿到值的呀