java - Android HttpURLConnection POST 不工作

Question

我对通过 POST 传递给 URL 的参数有疑问。当我在 PHP 中尝试检索它们时，它说 $_POST 是空的:

<?php
require_once 'credentials.php';
$connection = mysqli_connect(MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DATABASE);
$query = 'INSERT INTO ratings (disco, rating) VALUES (' .mysqli_real_escape_string($connection, $_POST["disco"]). ', ' . mysqli_real_escape_string($connection, $_POST["rating"]) . ')';
$result = mysqli_query($connection, $query);
echo json_encode($result);
mysqli_close($connection);  
?>

我的 Android 代码如下所示:

@Override
            protected String doInBackground(String... params) {
                String response = "";
                try {
                    URL url = new URL(params[0]);
                    HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
                    urlConnection.setConnectTimeout(10000);
                    urlConnection.setReadTimeout(10000);
                    urlConnection.setDoOutput(true);
                    urlConnection.setRequestMethod("POST");
                    urlConnection.setDoOutput(true);
                    urlConnection.setDoInput(true);
                    urlConnection.connect();

                    List<NameValuePair> parameters = new ArrayList<NameValuePair>();
                    parameters.add(new BasicNameValuePair("disco", params[1]));
                    parameters.add(new BasicNameValuePair("rating", params[2]));

                    OutputStream outputStream = urlConnection.getOutputStream();
                    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                    writer.write(getQuery(parameters));
                    writer.flush();
                    writer.close();
                    outputStream.close();
                    int responseCode = urlConnection.getResponseCode();
                    if(responseCode == HttpURLConnection.HTTP_OK) {
                        String line;
                        BufferedReader br=new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
                        while((line = br.readLine()) != null) {
                            response += line;
                        }
                    }
                } catch(Exception e) {
                    System.out.println(e.getMessage());
                }
                return response;
            }

            private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
                StringBuilder result = new StringBuilder();
                boolean first = true;

                for(NameValuePair pair : params) {
                    if(first)
                        first = false;
                    else
                        result.append("&");

                    result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
                    result.append("=");
                    result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
                }

                return result.toString();
            }

这是怎么回事？提前致谢

编辑:更新了代码，但仍然不起作用。

Answer 1

"&disco="

做那个:

"disco="