/**
  * 用户名重复检查
  *
  * @return
  * @throws IOException
  */
 public void checkedUserName() throws IOException {
   member = new Member();
   String userName = getRequest().getParameter("param");
   member.setMemberName(userName);
   member = memberService.getByName(member);
   if (member != null && !member.getMemberName().equals("")) {
     map.put("info", "该用户名已存在!");
     map.put("status", "n");
   } else {
     map.put("status", "y");
   }
   printJson(Object2Json(map));
 }