Question

我是android新手，即将编写与REST-API通信的第一个应用程序。我设法执行了GET请求，但是POST请求遇到了问题。一切都可以在Postman中运行-在Android上，每次尝试执行POST请求时，我的AsyncTask都会引发FileNotFound异常。

按照API的文档，我首先需要通过HTTP GET请求（https://vereinsflieger.de/interface/rest/auth/accesstoken）获得一个“访问令牌”，我已经成功地做到了这一点。现在，使用访问令牌，我要通过https://vereinsflieger.de/interface/rest/auth/signin上的POST请求登录。因为我不知道是什么原因，即使文件存在，我的AsyncTask也会引发FileNotFound异常（在Postman中可以正常工作）。我正在使用的代码或API本身有问题吗？

提前谢谢！

这是我的尝试：

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

    public static final String REQUEST_METHOD = "POST";
    public static final int READ_TIMEOUT = 15000;
    public static final int CONNECTION_TIMEOUT = 15000;
    public String result;
    public LoginActivity LoginActivity;

    public HttpPostRequest(LoginActivity a) { this.callingActivity = a; }

    @Override
    protected String doInBackground(String... params) {
        String stringURL = params[0];
        String logindata = params[1];
        String inputLine;
        try {
            //create URL object
            URL myUrl = new URL(stringURL);
            //create connection
            HttpsURLConnection connection = (HttpsURLConnection) myUrl.openConnection();

            //Set methods and timeouts
            connection.setRequestMethod(REQUEST_METHOD);
            connection.setReadTimeout(READ_TIMEOUT);
            connection.setConnectTimeout(CONNECTION_TIMEOUT);
            **connection.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());
            wr.write(logindata);
            wr.flush();**

            Log.d("RESPONSE", "" + connection.getResponseCode());

            //Create a new InputStreamReader
            InputStreamReader streamReader = new InputStreamReader(connection.getInputStream());
            //Create a new buffered reader and String Builder
            BufferedReader reader = new BufferedReader(streamReader);
            **StringBuilder stringBuilder = new StringBuilder();** //Here is where the exception is thrown
            //Check if the line we are reading is not null
            while((inputLine = reader.readLine()) != null){
                stringBuilder.append(inputLine);
            }
            //Close our InputStream and Buffered reader
            reader.close();
            streamReader.close();
            //Set our result equal to our stringBuilder
            result = stringBuilder.toString();
        } catch(IOException e){
            e.printStackTrace();
            result = null;
        }
        return result;
    }

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

    }
}

我希望返回一个包含JSON数据的字符串，相反，我得到了以下异常：

W/System.err: java.io.FileNotFoundException: https://vereinsflieger.de/interface/rest/auth/signin
W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:250)
W/System.err:     at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
W/System.err:     at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java)

HTTP POST请求引发FileNotFound异常（但在Postman中有效）

0 个答案: