java中如何根据HttpServletRequest获取JSON中POST数据呢?

HttpServletRequest获取POST中JSON数据的实现思路

使用request.getReader();
    即可获取前端传送过来的json信息

//post参数
  {"jsondata":"data"}


//doPost获取post参数信息

public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

  StringBuffer jb = new StringBuffer();
  String line = null;
  try {
    BufferedReader reader = request.getReader();
    while ((line = reader.readLine()) != null)
      jb.append(line);
  } catch (Exception e) { /*report an error*/ }

  try {
    JSONObject jsonObject =  HTTP.toJSONObject(jb.toString());
  } catch (JSONException e) {
    // crash and burn
    throw new IOException("Error parsing JSON request string");
  }
}