HttpServletRequest获取post的参数 同事的错误写法：
public @ResponseBody String registerLogin(HttpServletRequest request, HttpServletResponse response) {
// String userName = request.getParameter("userName");
正确：
try {
BufferedReader reader = request.getReader();
while ((line = reader.readLine()) != null)
sb.append(line);
service = sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
