Google Drive File Update

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.List;

import com.google.api.client.http.FileContent;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpResponse;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;

public class GoogleUtil {

	public static void MakeListToFileAsUTF8(List<String> strList, String filename) throws Exception {

		Writer writer = new BufferedWriter(
				new OutputStreamWriter(new FileOutputStream(new java.io.File(filename), false), "UTF-8"));

		for (String temp : strList) {			
			writer.write(temp);
		}

		writer.close();
	}

	public static void MakeStreamToFileAsUTF8(InputStream is, String filename) throws Exception {

		InputStreamReader ir = new InputStreamReader(is, "UTF-8");
		BufferedReader reader = new BufferedReader(ir);
		Writer writer = new BufferedWriter(
				new OutputStreamWriter(new FileOutputStream(new java.io.File(filename), false), "UTF-8"));

		while (true) {
			String temp = reader.readLine();
			if (temp == null)
				break;
			writer.write(temp);
		}

		reader.close();
		writer.close();
	}

	public static void updateFile(Drive service, File file, String fileName) throws Exception {

		service.files().delete(file.getId());
		service.files().update(file.getId(), file, new FileContent("text/plain", new java.io.File(fileName))).execute();
	}

	public static void printStream(InputStream is) throws IOException {
		InputStreamReader isr = new InputStreamReader(is);
		BufferedReader br = new BufferedReader(isr);
		while (true) {
			String temp = br.readLine();
			if (temp == null)
				break;
			System.out.println(temp);
		}
	}

	public static InputStream downloadFile(Drive service, File file) {
		if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
			try {
				HttpResponse resp = service.getRequestFactory().buildGetRequest(new GenericUrl(file.getDownloadUrl()))
						.execute();
				return resp.getContent();
			} catch (IOException e) {
				// An error occurred.
				e.printStackTrace();
				return null;
			}
		} else {
			// The file doesn't have any content stored on Drive.
			return null;
		}
	}
}