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Upload arraylist using httpurlconnection multipart/form-data

By : Satya
Date : September 16 2020, 06:00 PM
will help you NOTE that I have not tried if this code acctually works with the HttpURLConnection but it should.
From what I've read from the internet you can still use that loop you mentioned but with some modifications.
code :
Content-Disposition: form-data; name="something1"

Content-Disposition: form-data; name="something2"

public byte[] get_multipart_data(List<String> files, String boundary)
loop for all files
    write "--boundary"
    write "Content-Disposition: ...."
    write image_data
write "--boundary--"
ByteArrayOutputStream message = null;
DataOutputStream stream = null;

FileInputStream fileInputStream;

int maxBufferSize = 1024 * 1024;
byte[] buffer = new byte[maxBufferSize];
byte[] sendData = new byte[0];
try {
    message = new ByteArrayOutputStream();
    stream = new DataOutputStream(message);

    // Loop though all file names
    for(String fileName : files) {
        stream.writeBytes("--" + boundary + "\r\n"); // Start boundary
        stream.writeBytes("Content-Disposition: form-data; name=\"" + fileName + "\"\r\n\r\n");

        // Read the image data
        fileInputStream = new FileInputStream(fileName);
        int readBytes = 0;
        while((readBytes = fileInputStream.read(buffer)) != -1) {
            // Write file data to output
            stream.write(buffer, 0, readBytes);

    stream.writeBytes("--" + boundary + "--\r\n"); // Closing boundary

    sendData = message.toByteArray();
} catch(IOException e) {

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Passing parameters along with a multipart/form-data upload form (Java Http Post Upload)

By : user3247331
Date : March 29 2020, 07:55 AM
hop of those help? If isFormField on FileItemStream returns true it's a normal field. You can use openStream and read the contents into a String.
Something like this:
code :
FileItemStream item = iter.next();
if(item.isFormField()) {
   // Normal field
   String name = item.getFieldName();
   String value = Streams.asString(item.openStream());
} else {
   // File

HttpUrlConnection multipart-form-data return error 422 Unprocessable Entity

By : jassi
Date : March 29 2020, 07:55 AM
To fix this issue Finally I have built it successfully. here it's the solution
Add the following to the gradle
code :
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    useLibrary  'org.apache.http.legacy'
    dependencies {
             compile 'org.apache.httpcomponents:httpmime:4.3.1'
             compile group: 'org.apache.httpcomponents' , name: 'httpclient-android' , version: ''
public void executeMultipartPost(Bitmap bm) throws Exception {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bm.compress(Bitmap.CompressFormat.PNG, 75, bos);
            byte[] data = bos.toByteArray();
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost postRequest = new HttpPost(url);
            ByteArrayBody bab = new ByteArrayBody(data, getString(R.string.file_path));

            MultipartEntity reqEntity = new MultipartEntity(

            postRequest.addHeader("access_token", auth);

            reqEntity.addPart("type", new StringBody("image"));
            reqEntity.addPart("postId", new StringBody(postId));
            reqEntity.addPart("file", bab);

            HttpResponse response = httpClient.execute(postRequest);
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    response.getEntity().getContent(), "UTF-8"));
            String sResponse;
            StringBuilder s = new StringBuilder();

            while ((sResponse = reader.readLine()) != null) {
                s = s.append(sResponse);
            System.out.println("Response: " + s);
        } catch (Exception e) {
            // handle exception here
            Log.e(e.getClass().getName(), e.getMessage());

HTTPURLConnection - POST multipart/form-data with large file with FixedLengthStreamingMode

By : Carlos Delgado
Date : March 29 2020, 07:55 AM
wish helps you So I'm trying to send a multipart/form-data POST request with large image file. I can't pre-convert file to byte array, my app will crash with OutOfMemory exception, so I have to write contents of the file directly to connection's outputstream. Also, my server doesn't support chunked mode, so I have to calculate content length before sending data and use connection's setFixedLengthStreamingMode. , conn.disconnect() after outputStream.close()

Android to PHP: epipe Broken Pipe / stream closed posting chunked multipart form-data using httpurlconnection

By : Sandeep S
Date : March 29 2020, 07:55 AM
I wish this help you As stated here you should call either setFixedLengthStreamingMode(len) when the body length is known in advance, or setChunkedStreamingMode(0) when it is not. About the broken pipe error, note that, if possible, android will reuse the old socket connection since establishing a connection is a resource consuming operation in a mobile environment. Try to force the POST to be performed over a new connection:

simple HttpURLConnection POST file multipart/form-data from android to google blobstore

By : Brumaire
Date : March 29 2020, 07:55 AM
wish helps you I am using HttpURLConnection to achieve this.
Create one Multipart custom class ::
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