Java specific image downloader with multiple URL's

I can't figure out how to reference a specific line of text in a txt file. I need a specific image from a specific list of URL's and I am trying to generate the URL's by concatenating a URL prefix and a search number from a list of numbers in a txt file. I can't figure out how to reference the txt file and get a string from a line number.

package getimages;
public class ExtractAllImages {

public static int url_to_get = 1;
public static String urlupc;
public static String urlpre = "http://urlineedimagefrom/searchfolder/";
public static String url2 = "" + urlpre + urlupc + "";

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

        while(url_to_get > 2622){

        String line =     Files.readAllLines(Paths.get("file_on_my_desktop.txt")).get(url_to_get);
        urlupc = line;
        url2 = "" + urlpre + urlupc + "";

        String webUrl = url2;
        URL url = new URL(webUrl);
        URLConnection connection = url.openConnection();
        InputStream is = connection.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        HTMLEditorKit htmlKit = new HTMLEditorKit();
        HTMLDocument htmlDoc = (HTMLDocument) htmlKit.createDefaultDocument();
        HTMLEditorKit.Parser parser = new ParserDelegator();
        HTMLEditorKit.ParserCallback callback = htmlDoc.getReader(0);

        parser.parse(br, callback, true);

        for (HTMLDocument.Iterator iterator = htmlDoc.getIterator(HTML.Tag.IMG); iterator.isValid(); iterator.next()) {

            AttributeSet attributes = iterator.getAttributes();
            String imgSrc = (String) attributes.getAttribute(HTML.Attribute.SRC);

            if (imgSrc != null && (imgSrc.endsWith(".jpg") || (imgSrc.endsWith(".png")) || (imgSrc.endsWith(".jpeg")) || (imgSrc.endsWith(".bmp")) || (imgSrc.endsWith(".ico")))) {
                try {
                    downloadImage(webUrl, imgSrc);
                } catch (IOException ex) {
                    System.out.println(ex.getMessage());
                }
            }
        }
    }
 }

 public static String right(String value, int length) {
     return value.substring(value.length() - length);}

 private static void downloadImage(String url, String imgSrc) throws IOException {
        BufferedImage image = null;
        try {
            if (!(imgSrc.startsWith("http"))) {
                url = url + imgSrc;
            } else {
                url = imgSrc;
            }
            String webUrl = url2;
            String imagename = right(webUrl , 12);
            imgSrc = imgSrc.substring(imgSrc.lastIndexOf("/") + 1);
            String imageFormat = null;
            imageFormat = imgSrc.substring(imgSrc.lastIndexOf(".") + 1);
            String imgPath = null;
            imgPath = "C:/Users/Noah/Desktop/photos/" + urlupc + ".jpg";
            URL imageUrl = new URL(url);
            image = ImageIO.read(imageUrl);
            if (image != null) {
                File file = new File(imgPath);
                ImageIO.write(image, imageFormat, file);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }
}

My error is in setting the String line, My txt file has 2622 lines and I can't reference the file on my desktop and im not sure how to set the file path to my desktop? Sorry I'm not good at java.

Thanks for any help.