Get QR code from Google chart.

QRImage.java

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLEncoder;

public class QRImage {

  public static InputStream getInputStream(String host, int port)
			throws IOException {
		String serverUrl = URLEncoder.encode(
				String.format("http://%s:%s", host, port), "UTF-8");
		URL url = new URL(
				String.format(
						"http://chart.apis.google.com/chart?cht=qr&chs=300x300&chl=%s&chld=H|0",
						serverUrl));
		InputStream in = new BufferedInputStream(url.openStream());
		return in;
	}
}