import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.net.URL;

public class wallpaper {
	public static void main(String[] argc) throws ParserConfigurationException, SAXException, IOException
	{
		//getting the path of the bing jpg picture via analysis xml
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
		DocumentBuilder builder = factory.newDocumentBuilder();
		Document document = builder.parse("http://www.bing.com/HPImageArchive.aspx?format=xml&idx=0&n=8");
		document.normalize(); 
		String relativePath =document.getElementsByTagName("url").item(0).getTextContent();
		String path ="http://www.bing.com/"+relativePath;
		
		//download the jpg file
		URL url = new URL(path);
		DataInputStream dis = new DataInputStream(url.openStream());
		FileOutputStream fos = new FileOutputStream(new File("/tmp/wallpaper.jpg"));
		byte[] buffer = new byte[1024];
		int length;
		while((length=dis.read(buffer))>0)
		{	
			fos.write(buffer,0,length);
		}
		
		dis.close();
		fos.close();
		
		Process process = Runtime.getRuntime().exec("gsettings set org.gnome.desktop.background picture-uri file:///tmp/wallpaper.jpg");
	}
}