post 传到服务器的参数，不用getparameters()的话，有没有其他的方式可以取到？
------解决思路----------------------
protected void doPost(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException {
StringBuilder sb = new StringBuilder();
BufferedReader reader = req.getReader();
try {
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} finally {
reader.close();
}
sb.toString(); //上传的json字符串