Java: How to save / download a file available at a particular URL location in Internet?


</pre>
package singz.test;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.commons.io.FileUtils;

/*
 * @author Singaram Subramanian
 */
public class FileDownloadTest {

public static void main(String[] args) {

 // Make sure that this directory exists
 String dirName = "C:\\FileDownload";

 try {

System.out.println("Downloading \'Maven, Eclipse and OSGi working together\' PDF document...");

 saveFileFromUrlWithJavaIO(
 dirName + "\\maven_eclipse_and_osgi_working_together.pdf",
 "http://singztechmusings.files.wordpress.com/2011/09/maven_eclipse_and_osgi_working_together.pdf");

 System.out.println("Downloaded \'Maven, Eclipse and OSGi working together\' PDF document.");

 System.out.println("Downloading \'InnoQ Web Services Standards Poster\' PDF document...");

 saveFileFromUrlWithCommonsIO(
 dirName + "\\innoq_ws-standards_poster_2007-02.pdf",
 "http://singztechmusings.files.wordpress.com/2011/08/innoq_ws-standards_poster_2007-02.pdf");

 System.out.println("Downloaded \'InnoQ Web Services Standards Poster\' PDF document.");

 } catch (MalformedURLException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 }

}

// Using Java IO
 public static void saveFileFromUrlWithJavaIO(String fileName, String fileUrl)
 throws MalformedURLException, IOException {
 BufferedInputStream in = null;
 FileOutputStream fout = null;
 try {
 in = new BufferedInputStream(new URL(fileUrl).openStream());
 fout = new FileOutputStream(fileName);

byte data[] = new byte[1024];
 int count;
 while ((count = in.read(data, 0, 1024)) != -1) {
 fout.write(data, 0, count);
 }
 } finally {
 if (in != null)
 in.close();
 if (fout != null)
 fout.close();
 }
 }

// Using Commons IO library
 // Available at http://commons.apache.org/io/download_io.cgi
 public static void saveFileFromUrlWithCommonsIO(String fileName,
 String fileUrl) throws MalformedURLException, IOException {
 FileUtils.copyURLToFile(new URL(fileUrl), new File(fileName));
 }

}

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One comment

  1. I’m getting this error:

    “Error: File is in the wrong directory or is declared part of the wrong package. Directory name ‘Java’ does not match package name ‘test’.”

    I don’t know much about programming, but I figure this must have something to do with line 2, as that’s the only place in the code where “package” and “test” appear, and lines 4-9, as that’s the only place where “java” appears.

    By “does not match” does that mean that it found a package called singz.test from which to import the java.* things in in lines 4-9, bit the java.* things weren’t there to be imported?

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