code: public static byte[] getBodyBytes(ServletRequest request) {
  		try {
  			return IoUtil.readBytes(request.getInputStream());
  		} catch (IOException e) {
  			throw new IORuntimeException(e);
  		}
  	}
docs: 获取请求体byte[]<br>
  调用该方法后，getParam方法将失效
  
  @param request {@link ServletRequest}
  @return 获得请求体byte[]
  @since 4.0.2