Get Original Hi-res image from Zoomable image on Amazon

Some pages in amazon provide images which user can zoom on, like this page.
The question is "Where is the original hi-resolution image?".
You can easily find the explanation page for how to construct url for original hi-res image. (See this stack overflow page.)
In this post I will show you the code snippet for getting original hires imgae from ASIN code. Note!: This method might be unavailable if amazon change the implementation of zoom and hires image url construnction.

Code

Actually code is nothing special. Just find " DynAPI.addZoomViewer( ".

// pattern for extracting image code used for retrieving original image.
private static Pattern AMAZON_ZOOM_IMAGE_PATTERN 
    = Pattern.compile("DynAPI\\.addZoomViewer\\(\".+/(.+?)\",\\s*(.+?),\\s*(.+?),\\s*(.+?),\\s*(.+?),\\s*(.+?),.*\\)");

public static String findOriginalZoomImageUrl(String asin, String country)
{
    String url = getAmazonZoomImageWindowUrl(asin, country);
    try{
        // tricky part: you should set an User-Agent manually. 
        // If you use default Java User-Agent, you cannot get html which contains the image code.
        String content = getStringContentsFromURL(url, "utf-8");

        Matcher matcher = AMAZON_ZOOM_IMAGE_PATTERN.matcher(content.trim());
        if(matcher.find())
        {
            String base = matcher.group(1);
            String v = matcher.group(6);
            return "http://z2-ec2.images-amazon.com/images/P/"+base+"._SX_SCRMZZZZZZZ_V"+v+"_.jpg";
         }
    }
    catch(Exception e){}
    return null;
}

private static String getAmazonZoomImageWindowUrl(String asin, String country) {
    if("it".equalsIgnoreCase(country))
    {
        return "http://www.amazon.it/gp/product/images/"+asin+"/";
    }
    else if("jp".equalsIgnoreCase(country))
    {
       return "http://www.amazon.jp/gp/product/images/"+asin+"/";
    }
    return "http://www.amazon.com/gp/product/images/"+asin+"/";
}

public static String getStringContentsFromURL(String u, String charset) throws URISyntaxException, IOException {
    URL url = new URL(u);
    HttpURLConnection connection = null;
    try{
        connection = (HttpURLConnection)url.openConnection();
        // !!IMPORTANT!!
        // please investigate the User-Agent yourself ;)
        // I impersonated a browser and it worked fine.
        connection.setRequestProperty("User-Agent","Please investigate yourself..."); 
        connection.setRequestProperty("Accept","Please investigate yourself..."); 
        connection.setRequestProperty("Accept-Language","Please investigate yourself..."); 
        return toString(connection.getInputStream(), charset);
    }
    finally{
        if(connection != null){
            connection.disconnect();
        }
    }
}

// trivial IO utility methods
public static String toString(InputStream is, String charsetName) throws IOException {   
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    copy(is, baos, _1K_BYTES);
    return baos.toString(charsetName);
}
    
public final static void copy(InputStream is, OutputStream os, int bufsize) throws IOException {
    copy(is, os, new byte[bufsize]);
}

public final static void copy(InputStream is, OutputStream os, byte[] buffer)throws IOException {
    try{
        for (int bytes = 0 ;(bytes = is.read(buffer)) != -1; ) 
        {
            os.write(buffer, 0, bytes);
        }
        os.flush();
    }finally{
        closeQuietly(is);
    }
}