(throws IOException)

Image image = null;

try {

    URL url = new URL("http://www.yahoo.com/image_to_read.jpg");

    image = ImageIO.read(url);

} catch (IOException e) {

}

See javax.imageio package for more info. That's using the AWT image. Otherwise you could do:

 URL url = new URL("http://www.yahoo.com/image_to_read.jpg");

InputStream in = new BufferedInputStream(url.openStream());

ByteArrayOutputStream out = new ByteArrayOutputStream();

byte[] buf = new byte[1024];

int n = 0;

while (-1!=(n=in.read(buf)))

{

   out.write(buf, 0, n);

}

out.close();

in.close();

byte[] response = out.toByteArray();

And you may then want to save the image so do:

FileOutputStream fos = new FileOutputStream("C://borrowed_image.jpg");

fos.write(response);

fos.close();

You are looking for a web crawler. You can use JSoup to do this, here is basic example

It works for me)

URL url = new URL("http://upload.wikimedia.org/wikipedia/commons/9/9c/Image-Porkeri_001.jpg");

InputStream in = new BufferedInputStream(url.openStream());

OutputStream out = new BufferedOutputStream(new FileOutputStream("Image-Porkeri_001.jpg"));

for ( int i; (i = in.read()) != -1; ) {

    out.write(i);

}

in.close();

out.close();

If you want to save the image and you know its URL you can do this:

try(InputStream in = new URL("http://example.com/image.jpg").openStream()){

    Files.copy(in, Paths.get("C:/File/To/Save/To/image.jpg"));

}

You will also need to handle the IOExceptions which may be thrown.

The following code downloads an image from a direct link to the disk into the project directory. Also note that it uses try-with-resources.

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.MalformedURLException;

import java.net.URL;

import org.apache.commons.io.FilenameUtils;

public class ImageDownloader

{

    public static void main(String[] arguments) throws IOException

    {

        downloadImage("https://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg",

                new File("").getAbsolutePath());

    }

    public static void downloadImage(String sourceUrl, String targetDirectory)

            throws MalformedURLException, IOException, FileNotFoundException

    {

        URL imageUrl = new URL(sourceUrl);

        try (InputStream imageReader = new BufferedInputStream(

                imageUrl.openStream());

                OutputStream imageWriter = new BufferedOutputStream(

                        new FileOutputStream(targetDirectory + File.separator

                                + FilenameUtils.getName(sourceUrl)));)

        {

            int readByte;

            while ((readByte = imageReader.read()) != -1)

            {

                imageWriter.write(readByte);

            }

        }

    }

}