Java 发送到服务器时缺少JSON数据

当我解析一个JSON对象时，它会以正确的格式轻松解析。但一旦我将相同的内容发送到服务器端，值就会丢失

    JSONArray check0 = new JSONArray();
    JSONArray check1 = new JSONArray();
    JSONArray check2 = new JSONArray();

    check0.put(v11);
    check0.put(v12);
    check0.put(v13);

    check1.put(c11);
    check1.put(c12);
    check1.put(c13);

    check4.put(t11);
    check4.put(t12);
    check4.put(t13);


    draft.put("check2",id11);
    draft.put("check3",t11);

    draft.put("check0",check0);
    draft.put("check1",check1);
    draft.put("check4",check4);    

其中v11、v12…….t12、t13是字符串变量

我发送数据的代码：

URL url = new URL("http://10.0.2.2:8080/initial");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("USER-AGENT", "Mozilla/5.0");
connection.setRequestProperty("ACCEPT-LANGUAGE", "en-US,en;0.5");
connection.setDoOutput(true);
DataOutputStream dStream = new 
DataOutputStream(connection.getOutputStream());
System.out.println(draft.toString());
dStream.writeBytes(draft.toString());

系统输出：

{"Check1":["5","4","4"],"Check0":["6","44","4"],"Check2":"17082017123406","Check4":"1228123682","Check3":["4","4","4"]}

接收post请求的代码：

app.post('/initial', function(req, res){

console.log("POST received: "+ JSON.stringify(req.body));

res.end("cool");
});

控制台输出 收到的邮件：

---

{{\Check1\：{\5\，\4\，\4\：{\6\，\44\，\4\：{\4\，\4\：}}

尝试使用以下方法

con.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

范例

private JSONObject uploadToServer() throws IOException, JSONException {
        String query = "https://example.com";
        String json = "{\"key\":1}";

        URL url = new URL(query);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5000);
        conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestMethod("POST");

        OutputStream os = conn.getOutputStream();
        os.write(json.getBytes("UTF-8"));
        os.close();

        // read the response
        InputStream in = new BufferedInputStream(conn.getInputStream());
        String result = org.apache.commons.io.IOUtils.toString(in, "UTF-8");
        JSONObject jsonObject = new JSONObject(result);


        in.close();
        conn.disconnect();

        return jsonObject;
}

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请共享您的一些代码，以便有人能够判断错误。我已经更新了代码，请帮助我。请在创建请求json的地方共享代码。请，您可以帮助吗？