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File uploadedFile = driveService.files().create(fileMetadata, mediaContent) .setFields("id") .execute(); System.out.println("File ID: " + uploadedFile.getId()); String fileId = "abc123..."; OutputStream out = new FileOutputStream("downloaded.txt"); driveService.files().get(fileId).executeMediaAndDownloadTo(out); List files FileList result = driveService.files().list() .setPageSize(10) .setFields("nextPageToken, files(id, name, mimeType)") .execute(); for (File f : result.getFiles()) System.out.printf("%s (%s)\n", f.getName(), f.getId());

Note: Files created by a service account are owned by that account. To access team/shared drives, grant the service account’s email access in Google Drive. (Desktop/Web app) You’ll need to store/refresh credentials using AuthorizationCodeFlow . For a quick test, use GoogleAuthorizationCodeTokenRequest and save the refresh token. 4. Common Operations Upload a file File fileMetadata = new File(); fileMetadata.setName("myfile.txt"); fileMetadata.setParents(Collections.singletonList("root")); FileContent mediaContent = new FileContent("text/plain", new java.io.File("local/path.txt")); jav google drive