在android中将图像发布到REST API

Question

我想在 android 中将图像发送到 REST API。我创建了一个 android 应用程序，它只是对 API 进行请求调用并返回响应，但我知道我必须将图像发布到 REST API。

这是我的代码。

    private class PostImage extends AsyncTask<String, String, String> {
      @Override
      protected String doInBackground(String... data) {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        URL url = new URL("http://localhost:8080/JAXRS-FileUpload/rest/files/upload");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        }
    }

我怎样才能发出将图像发布到 REST API 的发布请求。这是 REST API 代码。

@Path("/files")
public class JerseyFileUpload {
@POST
    @Path("/upload")
    @Consumes(MediaType.)
    @Produces(MediaType.APPLICATION_JSON)
    public ImageUrl responseMsg(){
    //do something
    }

应该使用哪种媒体类型来消费图像。

Answer 1

MultipartEntity entity = new MultipartEntity();
FileBody userPhoto = new FileBody(new File(path));
entity.addPart("file", userPhoto);

String url = UPDATE_PROFILE_URL;
HttpParams params1 = new BasicHttpParams();
HttpConnectionParams.setStaleCheckingEnabled(params1, false);

int timeOut = 2 * 60 * 1000;

HttpConnectionParams.setConnectionTimeout(params1, timeOut);
HttpConnectionParams.setSoTimeout(params1, timeOut);
DefaultHttpClient httpClient = new DefaultHttpClient(params1);
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(entity);
HttpResponse response = null;
JSONObject jsResp = null;
        try {
            response = httpClient.execute(httpPost);
            HttpEntity resEntity = response.getEntity();

            String sServerResponse = EntityUtils.toString(resEntity);
            Log.i("abc", "FROM: POST:" + sServerResponse);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }

Answer 2

我个人使用 loopj 进行客户端-服务器通信，并且可以使用其中的文件发送图像。在您的应用程序 gradle 中添加以下依赖项以使用 loopj

compile 'com.loopj.android:android-async-http:1.4.9'

然后发送图片

public void sendAllData() {
    String Url = "your url here";
    //If any auth is needed
    String username = "username";
    String password = "password";

    Cursor cursor = mContext.getContentResolver().query(Media.EXTERNAL_CONTENT_URI, new String[]{Media.DATA, Media.DATE_ADDED, MediaStore.Images.ImageColumns.ORIENTATION}, Media.DATE_ADDED, null, "date_added ASC");
    if (cursor != null && cursor.moveToLast()) {
        Uri fileURI = Uri.parse(cursor.getString(cursor.getColumnIndex(Media.DATA)));
        fileSrc = fileURI.toString();
        cursor.close();
    }

    // Bitmap compressedImage = BitmapFactory.decodeStream(new ByteArrayInputStream(out.toByteArray()));
    AsyncHttpClient client = new AsyncHttpClient();
    client.setBasicAuth(username, password);
    RequestParams params = new RequestParams();
    try {
        params.put("pic", storeImage());
    } catch (FileNotFoundException e) {
        Log.d("MyApp", "File not found!!!" + fileSrc);
    }
    client.post(Url, params, new JsonHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, JSONObject responseBody) {
            //Do what's needed
        }

        @Override
        public void onFailure(int statusCode, Header[] headers, String errorResponse, Throwable error) {
            //Print error
        }
    });

}

private File storeImage() {
    String filename = "anyName";
    String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
    OutputStream outStream = null;

    File file = new File(extStorageDirectory, filename + ".jpg");
    try {
        outStream = new FileOutputStream(file);
        bookImage.compress(CompressFormat.JPEG, 80, outStream);
        outStream.flush();
        outStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return file;
}

Answer 3

您实现了一个服务并在其中发布图像，请查看我的示例here

检查 postMultiPart 方法。

Answer 4

将其更改为： 多部分/表单数据