java后台得到request payload請求中的json請求參數

private String getRequestPayload(HttpServletRequest req) {
StringBuilder sb = new StringBuilder();
try(BufferedReader reader = req.getReader();) {
char[]buff = new char[1024];
int len;
while((len = reader.read(buff)) != -1) {
sb.append(buff,0, len);
}
}catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}

調用該方法得到json字符串，解析json字符串即可獲取所需參數。