boxDownloadAllFilesInFolder.java

package com.box;

import com.box.sdk.BoxConfig;
import com.box.sdk.BoxDeveloperEditionAPIConnection;
import com.box.sdk.BoxFile;
import com.box.sdk.BoxFolder;
import com.box.sdk.BoxItem;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Playground {

  public static void main(String[] args) throws Exception {
    Path configPath = Paths.get("config.json");
    Path currentDir = Paths.get("").toAbsolutePath();
    try (BufferedReader reader = Files.newBufferedReader(configPath, Charset.forName("UTF-8"))) {
      BoxConfig boxConfig = BoxConfig.readFrom(reader);
      BoxDeveloperEditionAPIConnection client = BoxDeveloperEditionAPIConnection.getAppEnterpriseConnection(boxConfig);
      String folderId = "43491738095";
      BoxFolder folder = new BoxFolder(client, folderId);
      String folderName = folder.getInfo().getName();
      Path localFolderPath = currentDir.resolve(Paths.get(folderName));
      if (!Files.exists(localFolderPath)) {
        localFolderPath = Files.createDirectory(localFolderPath);
      } else {
        localFolderPath = resetLocalFolder(localFolderPath);
      }

      for (BoxItem.Info itemInfo : folder) {
        if (itemInfo instanceof BoxFile.Info) {
          BoxFile.Info fileInfo = (BoxFile.Info) itemInfo;
          BoxFile file = new BoxFile(client, fileInfo.getID());
          String localFilePath = localFolderPath.resolve(Paths.get(fileInfo.getName())).toAbsolutePath().toString();
          FileOutputStream stream = new FileOutputStream(localFilePath);
          file.download(stream);
          stream.close();
        }
      }

    }
  }

  static Path resetLocalFolder(Path localFolderPath) throws IOException {
    Files.list(localFolderPath).forEach(file -> {
      System.out.println(file.getFileName());
      try {
        Files.delete(file.toAbsolutePath());
      } catch (IOException e) {
      }
    });
    Files.delete(localFolderPath);
    localFolderPath = Files.createDirectory(localFolderPath);
    return localFolderPath;
  }
}