code: public static String getBody(){
  		try {
  			return IoUtil.read(getServletRequest().getReader());
  		} catch (IOException e) {
  			throw new ActionRuntimeException(e);
  		}
  	}
docs: 获取请求体<br>
  调用该方法后，{@link Request#getParam(String)} 方法将失效
  @return 获得请求体