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Loading Images from a website taking forever.

Posted on 2004-09-06
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Last Modified: 2010-03-31
Hi there, I have a list of images I am loading from a website, these images are all around 5kb each.  When I perform a load, it seems like it takes seconds to load each image.  How can I load them properly so it will load faster?  This is basically what I am doing now.  I am populating a JList with icons and text.  The mFilename_ac variable looks like "http://www.website/picture/picture.gif".  So how can I ensure the picture loads, and that it loads fast?  I have put it in a thread, but it takes 60 seconds to load 100 images on a highspeed dsl?  Thanks experts.

            DefaultListModel dlm2 = new DefaultListModel();
            URL image = new URL(mEmoticonData_t[i].mFileName_ac.toString());
            ImageIcon myIcon_t = new ImageIcon(image);
            for (int i=0; i< numImages_i; i++)
            {
                    dlm2.addElement(new ListEntry(mEmoticonData_t[i].mCharacters_ac.toString(), myIcon_t));
            }
            emoticonList.setModel(dlm2);
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Question by:kesea
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12 Comments
 
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Expert Comment

by:objects
Comment Utility
> it seems like it takes seconds to load each image.

>  I have put it in a thread, but it takes 60 seconds to load 100 images

The second statement seems to suggest its more like 0.5 sec per image.

Can't see anything in the code that would cause it to be unnecessarily slow.
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LVL 92

Expert Comment

by:objects
Comment Utility
If you don't use an ImageIcon and instead load your images directly (as Image's) then they will load asynchronously.
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Author Comment

by:kesea
Comment Utility
How do I load an image directly from a URL?  
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Expert Comment

by:girionis
Comment Utility
ImageIcon icon = ImageIcon(new URL("http://www.mysite.com/myimage.jpg"))
Image image = icon.getImage();
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Expert Comment

by:CEHJ
Comment Utility
Make sure it *is* the download that's taking longer than you think it is, and not the rendering, before you try to take remedial action. For that, you'd be better leaving the code as it is (synchronous) first. You can then give objects' suggestion a try later, although it may not improve things and may even slow them down.
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Author Comment

by:kesea
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Can I load the images from my .jar file or will I have to get it digitally signed?
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Expert Comment

by:CEHJ
Comment Utility
Yes - why do you think you'd need to sign it?
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objects earned 500 total points
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> Can I load the images from my .jar file or will I have to get it digitally signed?

Absolutely, use getResource() to get a URL for the image.
No need to sign it.
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by:objects
Comment Utility
URL image = getClass().getResource("/images/my.gif");
ImageIcon i = new ImageIcon(image);
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LVL 86

Expert Comment

by:CEHJ
Comment Utility
kesea - can you explain why that particular 'answer' merited the entire question points?
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by:objects
Comment Utility
> can you explain why that particular 'answer' merited the entire question points?

because it will greatly speed up the loading ???
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Expert Comment

by:CEHJ
Comment Utility
Using getResource will have no effect on the loading speed whatever
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