Java Image Downloader Can't Skip if Error

Question

I am Referencing an array to generate urls to download images from however if the url is dead the program errors and stops i need it to skip that url if an error occurs but I can not figure out how any ideas?

package getimages2;
public class Extractimages {

public static String url_to_get = "http://www.url.com/upc/11206007076";
public static long urlupc;
public static String URLarray[] = new String[3000];

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

     for(int apples = 0; apples<URLarray.length; apples++){

        String UPCarray[] = {"051000012616","051000012913","051000012937"};
        url_to_get = "http://www.url/upc/" + UPCarray[apples];

        String webUrl = url_to_get;
        String url2 = url_to_get;
        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 = url_to_get;
            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/" + imagename + ".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();
        }

    }

}

The program runs through the array fine but once it generates a dead url it errors and exits i need it to skip that url and move on. Thanks for any help.

you "can not figure out how any ideas?" what ideas? didnt you see the Stop sign on the road? and good luck — gpasch, May 10 '16 at 21:49

score 0 · Accepted Answer · edited May 23 '17 at 12:31

0

Well, you'll need to have a way to check if the URL you've generated is valid. There's some answers on that here: How to check for a valid URL in Java?

edited May 23 '17 at 12:31

Community

1
1

answered May 10 '16 at 21:50

Charles Roland

90
3

Thanks Ill give that a try – La Fon May 10 '16 at 21:52
I created a URL Check Method however since the website creates a page for invalid URLs it always returns TRUE don't know if theres a way around this – La Fon May 10 '16 at 22:16

Java Image Downloader Can't Skip if Error

1 Answers1