servlet 麻烦大家帮我看看下面代码有什么问题？

Question

String clinetToken = request.getParameter("token");
if(clinetToken == null){
String jsonStr = request.getReader().readLine();
JSONObject json = new JSONObject(jsonStr);
clinetToken = (String) json.get("token");
if(clinetToken == null){

return true;
}
}

程序运行报“getReader() has already been called for this request”的错误，请问怎么修改？

Answer 1

请求的参数是整个RequestBody