Java

Upload Binary File from Memory

See more Google Drive Examples

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    success = true;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  This example uses a previously obtained access token having permission for the 
    //  Google Drive scope.

    CkAuthGoogle gAuth = new CkAuthGoogle();
    gAuth.put_AccessToken("GOOGLE-DRIVE-ACCESS-TOKEN");

    CkRest rest = new CkRest();

    //  Connect using TLS.
    boolean bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

    //  Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth);

    //  -------------------------------------------------------------------------
    //  A multipart upload to Google Drive needs a multipart/related Content-Type
    rest.AddHeader("Content-Type","multipart/related");

    //  Specify each part of the request.

    //  The 1st part is JSON with information about the file.
    rest.put_PartSelector("1");
    rest.AddHeader("Content-Type","application/json; charset=UTF-8");

    //  Construct the JSON that will contain the metadata about the file data to be uploaded...
    CkJsonObject json = new CkJsonObject();
    json.AppendString("name","hedgehogs.jpg");
    json.AppendString("description","A cute photo of two hedgehogs.");
    json.AppendString("mimeType","image/jpeg");

    //  To place the file in a folder, we must add a parents[] array to the JSON
    //  and add the folder ID.  
    //  In a previous example (see Build Local Metadata Cache
    //  we built a local cache to make it easy to lookup file IDs given a file path.
    //  Let's find the file ID for the folder "testFolder/abc/123"
    CkCache gdCache = new CkCache();
    gdCache.put_Level(0);
    gdCache.AddRoot("C:/ckCache/googleDrive");

    String folderId = gdCache.fetchText("testFolder/abc/123");
    if (gdCache.get_LastMethodSuccess() != true) {
        System.out.println("Filepath not found in cache.");
        return;
        }

    CkJsonArray parents = new CkJsonArray();
    json.AppendArray2("parents",parents);

    parents.AddStringAt(-1,folderId);

    rest.SetMultipartBodyString(json.emit());

    //  The 2nd part is the file content, which will contain the binary image data.
    rest.put_PartSelector("2");
    rest.AddHeader("Content-Type","image/jpeg");

    CkFileAccess fac = new CkFileAccess();
    CkByteData jpgBytes = new CkByteData();
    //  Read a JPG file from the local filesystem.
    success = fac.ReadEntireFile("qa_data/jpg/hedgehogs.jpg",jpgBytes);

    //  Add the bytes to our upload
    rest.SetMultipartBodyBinary(jpgBytes);

    String jsonResponse = rest.fullRequestMultipart("POST","/upload/drive/v3/files?uploadType=multipart");
    if (rest.get_LastMethodSuccess() == false) {
        System.out.println(rest.lastErrorText());
        return;
        }

    //  A successful response will have a status code equal to 200.
    if (rest.get_ResponseStatusCode() != 200) {
        System.out.println("response status code = " + rest.get_ResponseStatusCode());
        System.out.println("response status text = " + rest.responseStatusText());
        System.out.println("response header: " + rest.responseHeader());
        System.out.println("response JSON: " + jsonResponse);
        return;
        }

    //  Show the JSON response.
    json.Load(jsonResponse);

    //  Show the full JSON response.
    json.put_EmitCompact(false);
    System.out.println(json.emit());

    //  A successful response looks like this:
    //  {
    //    "kind": "drive#file",
    //    "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
    //    "name": "hedgehogs.jpg",
    //    "mimeType": "image/jpeg"
    //  }

    //  Get the fileId:
    System.out.println("fileId: " + json.stringOf("id"));
  }
}