通过httpurlconnection发布json数据

我正在尝试使用Android向我的RESTful API发出请求, HttpURLConnection . 数据必须通过POST数据以JSON格式发送。

这是我的代码:

JSONObject check_request = new JSONObject();
check_request.put("username", username);

JSONObject request = BuildRequest(check_request, "username_check", false);
Log.i("DEBUG", request.toString());
// DEBUG OUTPUT: {"timestamp":1526900318,"request":{"username":"blubberfucken","type":"username_check"}}

URL request_url = new URL(apiURL);
HttpURLConnection connection = (HttpURLConnection)request_url.openConnection();
connection.setRequestProperty("User-Agent", "TheGameApp");
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-type", "application/json; charset=UTF-8");
connection.setDoOutput(true);
connection.setDoInput(true);

OutputStream os = connection.getOutputStream();
os.write(request.toString().getBytes("UTF-8"));
os.flush();


InputStream in = new BufferedInputStream(connection.getInputStream());

String result = "";

BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF8"));
String str;
while ((str = br.readLine()) != null)
{
    result += str;
}

Log.i("DEBUG", result);

//JSONObject result_json = new JSONObject(result);
os.close();
in.close();
connection.disconnect();

您可以将调试输出视为注释。问题是API没有收到任何发布数据。我用过PHP var_dump 倾倒 $_POST 和 $_REQUEST 它们都是空数组。

我这里缺什么?

当问题出现时,如果API工作。此curl命令的工作结果正确(它与调试器打印的JSON数据相同):

curl -d '{"timestamp":1526900318,"request":{"username":"blubberfucken","type":"username_check"}}' -H "Content-Type: application/json" -X POST http://localhost/v1/api.php