Sachin Sachin - 4 months ago 34
Java Question

Multipart File upload using Apache REST client

I was trying to upload files to OneDrive using multipart request. I've tried many ways but none of them worked.

The request is of the form :-

POST /drive/items/{folder-id}/children
Content-Type: multipart/related; boundary="A100x"

--A100x
Content-ID: <metadata>
Content-Type: application/json

{
"name": "newfile.txt",
"file": {},
"@content.sourceUrl": "cid:content",
"@name.conflictBehavior": "rename"
}

--A100x
Content-ID: <content>
Content-Type: text/plain

Contents of the file to be uploaded.

--A100x--


I've tried many ways. The snippet I've done for this added below. Any help would be appreciated.

Snippet :-

HttpClient httpClient = HttpClientBuilder.create().build();
URIBuilder uriBuilder = new URIBuilder(URI);
HttpPost post = new HttpPost(uriBuilder.build());
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
Charset chars = Charset.forName("utf-8");
builder.setCharset(chars);
post.setEntity(builder.build());
builder.addPart("content", new FileBody(new File("/home/myfiles/test"), ContentType.APPLICATION_OCTET_STREAM, "test"));
builder.addPart("metadata", new StringBody(metaJson, ContentType.APPLICATION_JSON));
post.setHeader("Content-Type", "multipart/form-data");
post.addHeader("Authorization", "Bearer " + ACCESS_TOKEN);
try {
HttpResponse response = httpClient.execute(post);
if (response.getStatusLine().getStatusCode() == 200) {
br = new BufferedReader(new InputStreamReader((response.getEntity().getContent())));
responseBuilder = new StringBuilder();
while ((output = br.readLine()) != null) {
responseBuilder.append(output);
}
} else {
System.out.println("Failed : HTTP error code : " + response.getStatusLine().getStatusCode());
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}


URI :


https://api.onedrive.com/v1.0/drive/root:/myfiles/children

Answer

Later on I realized that I can use simple file upload provided my files are simple doc files. And achieved solution using Apache REST client.

Code snippet :-

    BufferedReader br = null;
    String output;
    StringBuilder responseBuilder = null;
    HttpClient httpClient = HttpClientBuilder.create().build();
    URIBuilder uriBuilder = new URIBuilder(<UPLOAD_URL>);
    HttpPut request = new HttpPut(uriBuilder.build());
    request.addHeader("Authorization", "Bearer " + oneDriveConnection.getAccessToken());
    request.addHeader("Content-Type", mimeType);
    HttpEntity entity = new ByteArrayEntity(bytes);
    request.setEntity(entity);
    HttpResponse response = httpClient.execute(request);
    int responseCode = response.getStatusLine().getStatusCode();
    if (responseCode == 201 || responseCode == 200) {
        br = new BufferedReader(new InputStreamReader((response.getEntity().getContent())));
        responseBuilder = new StringBuilder();
        while ((output = br.readLine()) != null) {
            responseBuilder.append(output);
        }
    } else {
        logger.error("Failed : HTTP error code : " + response.getStatusLine().getStatusCode());
        throw new UploadException("Upload failure, Status code : " + response.getStatusLine().getStatusCode());
    }