FileNotFoundException：https://www.googleapis.com/geolocation/v1/geolocate?key=

Question

我在 Geolocation API 中收到 FileNotFoundException。我用 google 搜索了一下，发现它只支持 POST 方法，但我已经在 POST 本身中调用了。

请在下面找到我的代码片段，

活动：

String url = "https://www.googleapis.com/geolocation/v1/geolocate?key=API_KEY";
LocationAsyncTask task = new LocationAsyncTask(this);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
    task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, url);
else
    task.execute(url);

异步任务：

protected Void doInBackground(String... param) {
    HttpsConnectionHelper conn = new HttpsConnectionHelper(weakContext.get());
    String response = conn.httpPost(param[0]);
    Log.d(MainActivity.LOG_TAG, "LocationAsyncTask = " + response);
    return null;
}

Https连接：

String httpPost(String requestURL) {
        Log.d(MainActivity.LOG_TAG, "HttpsConnectionHelper# requestURL = " + requestURL);
    URL url;
    HttpsURLConnection conn = null;

    try {
        //Create connection
        url = new URL(requestURL);
        conn = (HttpsURLConnection) url.openConnection();
        Log.d(MainActivity.LOG_TAG, "HttpsConnectionHelper# url.openConnection()");

        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/json");
        conn.setRequestProperty("Accept", "application/json");
        conn.connect();

        Log.d(MainActivity.LOG_TAG, "HttpsConnectionHelper# conn.connect()");

        //Get Response
        InputStream is = conn.getInputStream();
        Log.d(MainActivity.LOG_TAG, "HttpsConnectionHelper# is.available() = "+is.available());
        BufferedReader rd = new BufferedReader(new InputStreamReader(is));
        String line;
        StringBuilder response = new StringBuilder();

        while ((line = rd.readLine()) != null) {
            response.append(line);
        }

        rd.close();
        return response.toString();

    } catch (Exception e) {
        e.printStackTrace();
        Log.d(MainActivity.LOG_TAG, "HttpsConnectionHelper#Exception# e.getMessage() = "+e.getMessage());

    } finally {
        if (conn != null) {
            conn.disconnect();
        }
    }

    return "";
}

编辑

谷歌地理定位API

curl -X POST "https://www.googleapis.com/geolocation/v1/geolocate?key=YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d \
'{ "homeMobileCountryCode":310,
   "homeMobileNetworkCode":410,
   "radioType":"gsm",
   "carrier":"Vodafone",
   "considerIp":true
}'

这是来自官方文档。我已经使用这个Curl命令编写了相应的Android代码。

public class GeolocationTask extends AsyncTask<Void, Void, String> {

@Override
protected String doInBackground(Void... params) {
    String apiUrl = "https://www.googleapis.com/geolocation/v1/geolocate?key=API_KEY";
    Log.d(MainActivity.LOG_TAG, "GeolocationTask# doInBackground() apiUrl = " + apiUrl);
    String requestBody = "{ " +
            "\"homeMobileCountryCode\":310, " +
            "\"homeMobileNetworkCode\":410, " +
            "\"radioType\":\"gsm\", " +
            "\"carrier\":\"Vodafone\", " +
            "\"considerIp\":true " +
            "}";

    try {
        URL url = new URL(apiUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        // Set up the connection
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/json");
        connection.setDoOutput(true);

        Log.d(MainActivity.LOG_TAG, "GeolocationTask# doInBackground() before write");
        // Write the request body
        try (OutputStream os = connection.getOutputStream()) {
            byte[] input = requestBody.getBytes("utf-8");
            os.write(input, 0, input.length);
        }

        Log.d(MainActivity.LOG_TAG, "GeolocationTask# doInBackground() after write");

        // Read the response
        try (BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"))) {
            StringBuilder response = new StringBuilder();
            String responseLine = null;
            while ((responseLine = br.readLine()) != null) {
                response.append(responseLine.trim());
            }
            Log.d(MainActivity.LOG_TAG, "GeolocationTask# doInBackground() response.toString() = "+response.toString());
            return response.toString();
        }
    } catch (IOException e) {
        e.printStackTrace();
        Log.d(MainActivity.LOG_TAG, "GeolocationTask# doInBackground()# Excep = "+e.getMessage());
    }

    return null;
}

@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);

    // Handle the result, e.g., parse the JSON response
    if (result != null) {
        // Parse and handle the JSON response here
        Log.d(MainActivity.LOG_TAG, "LocationAsyncTask(new) = " + result);
    }
}

}

但仍然遇到同样的异常。

Answer 1

导致异常的最可能原因是 Geolocation API 作为响应返回给您某种错误。您需要在调用

getInputStream

之前检查响应代码，并相应地处理错误，如下所示：

    int responseCode = connection.getResponseCode();
    if (responseCode != 200) {
        // Get error response
        InputStream errorIs = connection.getErrorStream();
        processError(errorIs);
    } else {
        InputStream is = connection.getInputStream();
        // do whatever you want
    }

您可以阅读 HttpURLConnection.html#getErrorStream Javadoc 了解详细信息，并从 这个问题的答案中获得更多想法。