String country = "";
  if (null != request.getParameter("areaName")) {
    country = request.getParameter("areaName");
    try {
      // 如果是乱码就转码
      if (!(Pattern.matches("[/u4E00-/u9FA5]", country))) {     country = new String(country.getBytes("ISO-8859-1"),"UTF-8");
        }
              } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
      }
    }