private Saver saver;
public String execute() throws Exception{
setMessage("hello"+getUsername());
SessionHelper sh = new SessionHelper(this.session);
sh.put("hi", "hiiii");
city = "hangzhou ";
userA.setUserName("userName");
userA.setPassWord("passWord");
ActionContext.getContext().getSession().put("msg", "session.msg hahaha");
HttpServletRequest request = ServletActionContext.getRequest();