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ExportPdf.java
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ExportPdf.java
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [START drive_export_pdf]
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
/* Class to demonstrate use-case of drive's export pdf. */
public class ExportPdf {
/**
* Download a Document file in PDF format.
*
* @param realFileId file ID of any workspace document format file.
* @return byte array stream if successful, {@code null} otherwise.
* @throws IOException if service account credentials file not found.
*/
public static ByteArrayOutputStream exportPdf(String realFileId) throws IOException {
// Load pre-authorized user credentials from the environment.
// TODO(developer) - See https://developers.google.com/identity for
// guides on implementing OAuth2 for your application.
GoogleCredentials credentials = GoogleCredentials.getApplicationDefault()
.createScoped(Arrays.asList(DriveScopes.DRIVE_FILE));
HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(
credentials);
// Build a new authorized API client service.
Drive service = new Drive.Builder(new NetHttpTransport(),
GsonFactory.getDefaultInstance(),
requestInitializer)
.setApplicationName("Drive samples")
.build();
OutputStream outputStream = new ByteArrayOutputStream();
try {
service.files().export(realFileId, "application/pdf")
.executeMediaAndDownloadTo(outputStream);
return (ByteArrayOutputStream) outputStream;
} catch (GoogleJsonResponseException e) {
// TODO(developer) - handle error appropriately
System.err.println("Unable to export file: " + e.getDetails());
throw e;
}
}
}
// [END drive_export_pdf]