public  static class SendMessage {
            public static String WEBHOOK_TOKEN = "https://qyapi.weixin.qq.com/cgi-bin/webhook/send?key=xxxxxx";
            public void send(String mess) throws IOException {
                HttpClient httpclient = HttpClients.createDefault();
                HttpPost httppost = new HttpPost(WEBHOOK_TOKEN);
                httppost.addHeader("Content-Type", "application/json; charset=utf-8");
                //构建一个json格式字符串textMsg，其内容是接收方需要的参数和消息内容
                String textMsg = "{\"msgtype\":\"text\",\"text\":{\"content\":\"磁盘超过70预警测试，请关注:"+mess+"\",\"mentioned_mobile_list\":[\"联系人1\",\"联系人2\",\"联系人3\"]},\"safe\":\"0\"}";
                StringEntity se = new StringEntity(textMsg, "utf-8");
                httppost.setEntity(se);
                HttpResponse response1 = httpclient.execute(httppost);
                if (response1.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                    String result = EntityUtils.toString(response1.getEntity(), "utf-8");
                    System.out.println(result);
                }
            }
        }