https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_event_pushes.html, 收到的关注事件或者取消关注事件消息体是空的，导致接收的服务报了下面的错误 org.dom4j.DocumentException: Error on line 1 of document  : Premature end of file. Nested exception: 接收关注/取消关注事件的代码： public static Map<String, String> parseXml(HttpServletRequest request, WeChatConfig config) throws Exception {         // 将解析结果存储在HashMap中         Map<String, String> map = new HashMap<String, String>();         log.info("###########################################");         // 从request中取得输入流 try(InputStreamReader inputStreamReader = new InputStreamReader(request.getInputStream()); BufferedReader bufferedReader = new BufferedReader(inputStreamReader)){ StringBuilder stringBuilder = new StringBuilder(); String line; while((line = bufferedReader.readLine()) != null){ stringBuilder.append(line); } log.info("from微信：{}, length:{}", stringBuilder, stringBuilder.length()); }         try(InputStream inputStream = request.getInputStream()) {             // 读取输入流             SAXReader reader = new SAXReader();             Document document = reader.read(inputStream);             String xmlBody = document.asXML(); log.info("xmlBody:{}", xmlBody); if(StringUtils.isEmpty(xmlBody.trim())){ throw new ThirdException("请求数据为空！"); }             if(StringUtils.isNotEmpty(xmlBody) && xmlBody.contains("Encrypt")){                 //解密请求消息体                 String nXmlString = decryptMsg(request, xmlBody,config);                 document = DocumentHelper.parseText(nXmlString);             }             // 得到xml根元素             Element root = document.getRootElement();             // 得到根元素的所有子节点             @SuppressWarnings("unchecked")             List<Element> elementList = root.elements();             // 遍历所有子节点             for (Element e : elementList)                 map.put(e.getName(), e.getText());         }         return map;     } 代码 Document document = reader.read(inputStream); 处报了上面的错误，from微信打印了8个空白字符串