// http://www.tutorialspoint.com/java/io/fileoutputstream_write_byte_len.htm

import java.net.*;

import java.io.*;

public class ImageWritingFromURL {

public static void main(String[] args) throws Exception {

// File tempfile = new File("user.dir/tmp", "tempfile.txt");

// File dir = new File("tmp/test");

File dir = new File("tmp");

dir.mkdirs();

for(int i = 0; i < 5; i++){

URL google = new URL("http://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png");

InputStream is = google.openStream();

File tmp = new File(dir, "google"+Integer.toString(i)+".png");

// tmp.createNewFile();

OutputStream os = new FileOutputStream(tmp);

byte[] b = new byte[20];

int length;

while ((length = is.read(b)) != -1) {

os.write(b, 0, length);

// os.write(b, 500, length); => java.lang.IndexOutOfBoundsException

// b = the source buffer

// 0 = the start offset in the data

// length = the number of bytes to write

}

is.close();

os.close();

}

}

}