通过HttpURLConnection将参数和图像上传到PHP服务器（Android）

场景： 我正在尝试通过服务中的HttpURLConnection发送一些POST数据（带有进度更新）。 我从图库中抓取一个图像，然后用2个参数将其发送到php服务器；invnum和密码

注意： 如果我使用HttpClient方法，那么参数和图像将在服务器中发送和接收，但我无法跟踪上传进度。我看到了一些与自定义多部分实体相关的代码，我希望尽可能避免引用库

我在SO中研究了很多相关问题，但似乎找不到解决方案。以下是我服务中的当前代码

protected void onHandleIntent(Intent intent) {
    String invnum = intent.getStringExtra("invnum");
    String uploadURL = intent.getStringExtra("uploadURL");
    String imageURI = intent.getStringExtra("imageURI");
    uri = Uri.parse(imageURI);

    String pass = "password";

    //get the actual path of the image residing in the phone
    String[] filePathColumn = { MediaStore.Images.Media.DATA };
    Cursor cursor = getContentResolver().query(uri,filePathColumn, null, null, null);
    cursor.moveToFirst();
    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
    picturePath = cursor.getString(columnIndex);
    cursor.close();

    ResultReceiver receiver = (ResultReceiver) intent.getParcelableExtra("receiver");

    //check url
    try {
        File file = new File(picturePath);
        FileInputStream fileInputStream = new FileInputStream(file);
        byte[] bytes = new byte[(int) file.length()];
        fileInputStream.read(bytes);
        fileInputStream.close();

        String fileName = file.getName();

        URL url = new URL(uploadURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        connection.setConnectTimeout(30000);
        connection.setReadTimeout(30000);
        connection.setChunkedStreamingMode(1024);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)");
        connection.setRequestProperty("image", fileName);
        connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

        DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());

        //send multipart form data (required) for file
        outputStream.writeBytes("Content-Disposition: form-data; name=\"image\";filename=\"" + fileName + "\"" + lineEnd);
        outputStream.writeBytes("Content-Type: image/jpeg" + lineEnd);
        //outputStream.writeBytes("Content-Type: " + URLConnection.guessContentTypeFromName(fileName) + lineEnd);
        //outputStream.writeBytes("Content-Transfer-Encoding: binary" + lineEnd);
        //outputStream.writeBytes("Content-Type: application/octet-stream" + lineEnd);
        outputStream.writeBytes("Content-Length: " + file.length() + lineEnd);
        outputStream.writeBytes(lineEnd);

        int bufferLength = 1024;
        for (int i = 0; i < bytes.length; i += bufferLength) {
            // publishing the progress....
            Bundle resultData = new Bundle();
            resultData.putInt("progress" ,(int)((i / (float) bytes.length) * 100));
            receiver.send(UPDATE_PROGRESS, resultData);

            if (bytes.length - i >= bufferLength) {
                outputStream.write(bytes, i, bufferLength);
            } else {
                outputStream.write(bytes, i, bytes.length - i);
            }
        }

        //end output
        outputStream.writeBytes(lineEnd);

        //write more parameters other than the file
        outputStream.writeBytes(twoHyphens + boundary + lineEnd);
        //outputStream.writeBytes(twoHyphens + boundary + lineEnd); //less twohyphens
        outputStream.writeBytes("Content-Disposition: form-data; name=\"invnum\"" + lineEnd);
        //outputStream.writeBytes("Content-Type: text/plain; charset=UTF-8" + lineEnd);
        //outputStream.writeBytes("Content-Length: " + invnum.length() + lineEnd);
        outputStream.writeBytes(lineEnd);
        outputStream.writeBytes(invnum + lineEnd);
        outputStream.writeBytes(twoHyphens + boundary + lineEnd);

        outputStream.writeBytes("Content-Disposition: form-data; name=\"pass\"" + lineEnd);
        //outputStream.writeBytes("Content-Type: text/plain; charset=UTF-8" + lineEnd);
        //outputStream.writeBytes("Content-Length: " + pass.length() + lineEnd);
        outputStream.writeBytes(lineEnd);
        outputStream.writeBytes(pass + lineEnd);
        outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

        // publishing the progress....
        Bundle resultData = new Bundle();
        resultData.putInt("progress", 100);
        receiver.send(UPDATE_PROGRESS, resultData);

        outputStream.flush();
        outputStream.close();
        //input ignored for now

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

更新： 首先，我从HTTPURLConnection得到一个404错误。我的url看起来像“”。

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更新前一句，通过删除“setChunkedStreamingMode”，我能够成功地将参数上传到服务器，但不能上传到图像！我快到了

在android HttpClient方法中优于HttpUrlConnection。我只展示了如何使用HttpClient实现post方法。我用了这个同样的结构

HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost();
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(<n>);// you have pass, invnum and image
nameValuePairs.add(new BasicNameValuePair("image", "<filName>"));
post.setEntity( new UrlEncodedFormEntity(nameValuePairs));
client.execute(post);

HttpClient=newdefaulthttpclient（）；
HttpPost=新的HttpPost（）；
List nameValuePairs=新的ArrayList（）；//您有pass、invnum和image
添加（新的BasicNameValuePair（“图像”和“”）；
setEntity（新的UrlEncodedFormEntity（nameValuePairs））；
客户。执行（post）；

终于让它开始工作了

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行“connection.setChunkedStreamingMode（1024）；”导致了该问题。删除后，参数和文件的上载成功。还有一个小问题，上传的进度不准确。返回的进度实际上是正在填充的缓冲区，这几乎是即时的，即使对于3MB图像也是如此。进度达到100后，文件仍在后台上传。我想这将是另一个问题。

这种方法有效，但不是我想要的，我无法使用HttpClient跟踪上传进度。也许你会检查一下你对android HttpClient方法的看法是否错误。一般来说，对于较新版本的android，httpurlconnection得到了更多的改进。在这里阅读更多：你有没有想过如何解决这个问题？我也在尝试做同样的事情，但每个人似乎都认为他们在跟踪上传进度，而实际上他们只是在跟踪对黄油的写入（如你所说）。非常感谢，伙计..一周来我一直对这个问题感到恼火。终于完成了你的回答…真的非常感谢。。。

HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost();
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(<n>);// you have pass, invnum and image
nameValuePairs.add(new BasicNameValuePair("image", "<filName>"));
post.setEntity( new UrlEncodedFormEntity(nameValuePairs));
client.execute(post);