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(Java) Download File (Stream to Local Filesystem)

This example demonstrates how to download the content of a file from Google Drive. The file is streamed to the local filesystem.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

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 = true;

    //  It 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.
    //  A single REST object, once connected, can be used for many Google Drive REST API calls.
    //  The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    //  then it will be automatically re-established as needed.
    boolean bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

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

    //  ------------------------------------------------------------------------------
    //  To download a file, we must know the file 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 say we want to download "testFolder/abc/123/penguins.jpg".
    //  First we lookup the fileId in the cache.  With the fileId, we can download the file.
    CkCache gdCache = new CkCache();
    gdCache.put_Level(0);
    gdCache.AddRoot("C:/ckCache/googleDrive");

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

    //  We need to send a GET request like this:
    //  GET https://www.googleapis.com/drive/v3/files/fileId?alt=media
    //  The fileId is part of the path.
    CkStringBuilder sbPath = new CkStringBuilder();
    sbPath.Append("/drive/v3/files/");
    sbPath.Append(fileId);
    rest.AddQueryParam("alt","media");

    //  Create a stream object with a SinkFile set to the path where the downloaded file will go.
    CkStream fileStream = new CkStream();
    fileStream.put_SinkFile("qa_output/penguins.jpg");
    //  Indicate that the response body should stream directly to fileStream,
    //  but only if the response status is 200.
    rest.SetResponseBodyStream(200,true,fileStream);

    //  Download the file, streaming the content to the SinkFile.
    String jsonResponse = rest.fullRequestNoBody("GET",sbPath.getAsString());
    if (rest.get_LastMethodSuccess() != true) {
        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());
        return;
        }

    System.out.println("File downloaded.");
  }
}

 

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