public class UploadProfilePicActivity extends Activity implements View.OnClickListener {
ImageView imageView;
Button btnUploadPic;
Button btnskipUploadPic;
Button btnSaveNContinue;
private static int RESULT_LOAD_IMAGE = 1;
String imagepath = null;
ProgressDialog dialog = null;
String url_profilePic;
private int serverResponseCode;
String api = "http://192.168.2.17:8000/api/v1/";
String format = "/?format=json";
AlmabayDatabase almabayDatabase;
String encodedString;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_uploadprofilepic);
    imageView = (ImageView) findViewById(R.id.imageView);
    btnUploadPic = (Button) findViewById(R.id.btnUploadPic);
    btnskipUploadPic = (Button) findViewById(R.id.btnSkipUploadPic);
    btnSaveNContinue = (Button) findViewById(R.id.btnSaveNContinue);
    btnUploadPic.setOnClickListener(this);
    btnSaveNContinue.setOnClickListener(this);
    url_profilePic = api + "user-media" + format;
    almabayDatabase = new AlmabayDatabase(this);

      }

@Override
public void onClick(View v) {
    if (v == btnUploadPic) {
        Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(i, RESULT_LOAD_IMAGE);

    } else if (v == btnSaveNContinue) {

        dialog = ProgressDialog.show(UploadProfilePicActivity.this, "", "Uploading file...", true);
        //  messageText.setText("uploading started.....");
        new Thread(new Runnable() {
            public void run() {
                Log.e("ImagePathTest", imagepath);

                uploadFile(imagepath);

            }
        }).start();
    }
}



protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK) {
        Uri selectedImageUri = data.getData();
        imagepath = getPath(selectedImageUri);
        Bitmap bitmap = BitmapFactory.decodeFile(imagepath);
        imageView.setImageBitmap(bitmap);

        Log.e("Uploading", "Uploading File :" + imagepath);
                }
}

public String getPath(Uri uri) {
    String[] projection = {MediaStore.Images.Media.DATA};
    Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}


    public int uploadFile(String imagepath) {

    String fileName = imagepath;
    Log.e("File Name", fileName);

    HttpURLConnection conn = null;
    DataOutputStream dos = null;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024;
    File sourceFile = new File(fileName);
    int pk = almabayDatabase.getUserID();

    if (!sourceFile.isFile()) {

        dialog.dismiss();

        Log.e("uploadFile", "Source File not exist :" + imagepath);

        runOnUiThread(new Runnable() {
            public void run() {
                                   Log.e("Sourcefile", "File doesn't exist");
            }
        });
        return 0;
    } else {
        try {

            // open a URL connection to the Servlet
            FileInputStream fileInputStream = new FileInputStream(sourceFile);
            URL url = new URL(url_profilePic);

            // Open a HTTP  connection to  the URL
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true); // Allow Inputs
            conn.setDoOutput(true); // Allow Outputs
            conn.setUseCaches(false); // Don't use a Cached Copy
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("ENCTYPE", "multipart/form-data");
            conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
            conn.setRequestProperty("name", fileName);
          //  conn.setRequestProperty("timeline_id", String.valueOf(pk));

            dos = new DataOutputStream(conn.getOutputStream());
            //Send Image
            Log.e("Sending","Sending Image");
            dos.writeBytes(twoHyphens + boundary + lineEnd);
            dos.writeBytes("Content-Disposition: form-data; name=\"name\";filename=\"" + fileName + "\"" + lineEnd);
            dos.writeBytes(lineEnd);

            // add parameter timeline_id
            String timeline_id = String.valueOf(pk);
            Log.e("Sending","Sending PK");
            dos.writeBytes(twoHyphens + boundary + lineEnd);
            dos.writeBytes("Content-Disposition: form-data; name=\"timeline_id\"" + lineEnd);
            dos.writeBytes(lineEnd);

            // assign value
            dos.writeBytes(timeline_id);
            dos.writeBytes(lineEnd);
            dos.writeBytes(twoHyphens + boundary + lineEnd);
            // create a buffer of  maximum size
            bytesAvailable = fileInputStream.available();

            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            buffer = new byte[bufferSize];

            // read file and write it into form...
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);

            while (bytesRead > 0) {

                dos.write(buffer, 0, bufferSize);
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);

            }

            // send multipart form data necesssary after file data...
            dos.writeBytes(lineEnd);
            dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

            // Responses from the server (code and message)
            serverResponseCode = conn.getResponseCode();
            Log.e("ResponseCode", String.valueOf(serverResponseCode));
            String serverResponseMessage = conn.getResponseMessage();

            Log.i("uploadFile", "HTTP Response is : "
                    + serverResponseMessage + ": " + serverResponseCode);

            if (serverResponseCode == 200) {

                runOnUiThread(new Runnable() {
                    public void run() {
                        Toast.makeText(UploadProfilePicActivity.this, "File Upload Complete.", Toast.LENGTH_SHORT).show();
                    }
                });
            }

            //close the streams //
            fileInputStream.close();
            dos.flush();
            dos.close();

        } catch (MalformedURLException ex) {

            dialog.dismiss();
            ex.printStackTrace();

            runOnUiThread(new Runnable() {
                public void run() {
                    //messageText.setText("MalformedURLException Exception : check script url.");
                    Toast.makeText(UploadProfilePicActivity.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
                }
            });

            Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
        } catch (Exception e) {

            dialog.dismiss();
            e.printStackTrace();

            runOnUiThread(new Runnable() {
                public void run() {
                    // messageText.setText("Got Exception : see logcat ");
                    Toast.makeText(UploadProfilePicActivity.this, "Got Exception : see logcat ", Toast.LENGTH_SHORT).show();
                }
            });
            Log.e("Upload file failed", "Exception : " + e.getMessage(), e);
        }
        dialog.dismiss();
        return serverResponseCode;

    } // End else block
}

在此代码中，我试图将图像与 timeline_id 一起发送到服务器。timeline_id 包含值 pk，它是存储在数据库中的用户的主键。我无法发送带有 timeline_id 的图像。我不知道实际问题出在哪里。请帮助我解决问题。

最佳答案

您可以使用下面的类简单地将文件部分与文本部分放在一起。

 String charset = "UTF-8";
 String requestURL = BASE_URL + "userregistration";

      MultipartUtility multipart = new MultipartUtility(requestURL, charset);
      multipart.addFormField("username", userJid);
      multipart.addFilePart("image", imageBitmap);//ima
      String response = multipart.finish();
      Log.d("SERVER REPLIED", response);

您可以创建一个 MultipartUtility 类，如下所示-

public class MultipartUtility {
    private final String boundary;
    private static final String LINE_FEED = "\r\n";
    private HttpURLConnection httpConn;
    private String charset;
    private OutputStream outputStream;
    private PrintWriter writer;

    /**
     * This constructor initializes a new HTTP POST request with content type
     * is set to multipart/form-data
     *
     * @param requestURL
     * @param charset
     * @throws IOException
     */
    public MultipartUtility(String requestURL, String charset)
            throws IOException {
        this.charset = charset;
        boundary = "===" + System.currentTimeMillis() + "===";

        URL url = new URL(requestURL);
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true); // indicates POST method
        httpConn.setDoInput(true);
        httpConn.setRequestProperty("Content-Type",
                "multipart/form-data; boundary=" + boundary);
        httpConn.setRequestProperty("api_key", "a05f9ece-cd34-11e4-afdc-1681e6b88ec1");
        outputStream = httpConn.getOutputStream();
        writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
                true);
    }

    /**
     * Adds a form field to the request
     *
     * @param name  field name
     * @param value field value
     */
    public void addFormField(String name, String value) {
        writer.append("--").
                append(boundary).
                append(LINE_FEED).
                append("Content-Disposition: form-data; name=\"").
                append(name).append("\"").
                append(LINE_FEED).
                append("Content-Type: text/plain; charset=").
                append(charset).append(
                LINE_FEED);
        writer.append(LINE_FEED);
        writer.append(value).append(LINE_FEED);
        writer.flush();
    }

    /**
     * Adds a upload file section to the request
     *
     * @param fieldName name attribute in <input type="file" name="..." />
     * @param fileBytes a File to be uploaded
     * @throws IOException
     */
    public void addFilePart(String fieldName, byte[] fileBytes)
            throws IOException {
//        String fileName = uploadFile.getName();
        writer.append("--")
                .append(boundary)
                .append(LINE_FEED)
                .append("Content-Disposition: form-data; name=\"")
                .append(fieldName)
                .append("\"; filename=\"")
                .append("user.jpeg")
                .append("\"")
                .append(LINE_FEED)
                .append("Content-Type: image/jpeg")
                .append(LINE_FEED)
                .append("Content-Transfer-Encoding: binary")
                .append(LINE_FEED)
                .append(LINE_FEED);
        writer.flush();

        ByteArrayInputStream inputStream = new ByteArrayInputStream(fileBytes);
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        outputStream.flush();
        inputStream.close();

        writer.append(LINE_FEED);
        writer.flush();
    }

    /**
     * Adds a header field to the request.
     *
     * @param name  - name of the header field
     * @param value - value of the header field
     */
    public void addHeaderField(String name, String value) {
        writer.append(name).append(": ").append(value).append(LINE_FEED);
        writer.flush();
    }

    /**
     * Completes the request and receives response from the server.
     *
     * @return a list of Strings as response in case the server returned
     * status OK, otherwise an exception is thrown.
     * @throws IOException
     */

    public String finish() throws IOException {
        writer.append(LINE_FEED).flush();
        writer.append("--")
                .append(boundary)
                .append("--")
                .append(LINE_FEED)
                .close();
        String data = "";
        int status = httpConn.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpConn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                data = data + line;
            }
            reader.close();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }
        return data.isEmpty() ? null : data;
    }
}

关于android - 无法在android中使用HttpURLConnection发送带有图像的附加参数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32565378/