gistfile1.txt

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;

public void downloadFileUtil(String pdfUrlToDownload) {

  HttpClient httpClient = HttpClients.createDefault();

  HttpGet httpGet = new HttpGet(pdfUrlToDownload);
  HttpResponse response;

  response = httpClient.execute(httpGet);
  HttpEntity entity = response.getEntity();
  FileOutputStream outstream = new FileOutputStream("/storage/directory/filename.pdf");
  entity.writeTo(outstream);
}