HttpPost httpPost = new HttpPost("https://open.95516.com/open/access/1.0/backendToken");

       CloseableHttpClient client = HttpClients.createDefault();

       String respContent = null;

       // appid

       String appid = new String("a00000000000000000000000000000001");

       // secret秘钥

       String secret = new String("2aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0");

       // json方式

       JSONObject jsonParam = new JSONObject();

       jsonParam.put("appId", appid);

       // 生成随机字符串

       String str = Utils.createNonceStr();

       jsonParam.put("nonceStr", str);

       // 时间戳

       String date = String.valueOf(System.currentTimeMillis() / 1000);

       jsonParam.put("timestamp", date);

       // 生成签名

       String waitSign = "appId=" + appid + "&nonceStr=" + str + "&secret=" + secret + "&timestamp=" + date;

       String sign = Utils.sha256(waitSign.getBytes());

       jsonParam.put("signature", sign);

       System.out.println(jsonParam.toString());

       // 解决中文乱码问题

       StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");

       entity.setContentEncoding("UTF-8");

       entity.setContentType("application/json");

       httpPost.setEntity(entity);

       HttpResponse resp = client.execute(httpPost);

       if (resp.getStatusLine().getStatusCode() == 200) {

           HttpEntity he = resp.getEntity();

           respContent = EntityUtils.toString(he, "UTF-8");

       }

    System.out.println(respContent);

待补充