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I have a List of byte array images.

I am showing an image in HTML page. If I want to display 25 such images I have to go 25 times to the database.

I want to avoid that please help.

HTML code

myProfile.init(function (map) {
    dom.byId("Image").src="UserImageDisplay?&userId="+map["userId"];    
}

Java code

byte[] image = userSession.getPhoto(Integer.parseInt(request.getParameter("userId"));

response.setContentType("image/imagetype");

OutputStream out = response.getOutputStream();

out.write(image);
out.flush();
out.close();
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2 Answers 2

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Well You have get the Image from somewhere , be it a DB or a File Server.

Since you have suggested , you dont want to load it every time from DB.

Here's what i would do to improve the performance.

1) Cache your images whenever you fetch one(thats not available in Cache) from the Db. 2)The cache can be Server Memory(highly advice against this , as you can quickly run out of memory) , or cache the images in local storage.

3) Storing of images in the cache , can be done realtime ie when the file is requested from the Web App, or you could schedule a cron/batch job to do that before hand .Preferably during off peak hours.

Choice between3 and 4 depends on how frequent the images are updated in the Database. I will leave it up to you.

4) You can explicitly specify the browser to cache the images.You can accomplish it with tag

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I think you should cache your images.

Best would be you start a cron job that generates image files.

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