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Editorial Team
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Asked: 2026-05-26T05:51:33+00:00

I want to rescale an image and return it to the client, and am

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I want to rescale an image and return it to the client, and am running into some trouble with sending the image back to the client.

My serverside controller:

@RequestMapping(value = {"/fw/ajax/submit_profileimage.do"})
public void submitFile(HttpServletRequest request, HttpServletResponse response, @RequestParam("file") MultipartFile f) {
    try {
        InputStream in = new ByteArrayInputStream(f.getBytes());
        BufferedImage originalImage = ImageIO.read(in);
        BufferedImage newImage = new BufferedImage(MAX_HEIGHT, MAX_WIDTH, BufferedImage.TYPE_INT_RGB);
        paintComponent(newImage.getGraphics(), originalImage, getRatio(originalImage));

        ImageIO.write(newImage, "png", response.getOutputStream());
        response.setContentType("image/png");
        response.getOutputStream().flush();
        response.getOutputStream().close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

Clientside Jquery code:

uploadButton.click(function(){
    $('#imagePreview').addClass('loading');
    form.ajaxSubmit(function(data){
    alert(data); //this is where I'd like to handle the image!
    });
});

the data that is returned by the ajaxSubmit is:

"<body style="margin: 0px;"><img style="-webkit-user-select: none" src="http://localhost:8080/fairview/ajax/submit_profileimage.do"></body>"

Clearly not an image file.
But when I check the debugger, I can see that the submit_profileimage.do request has succeded, and allegedly returned an image! I have no idea if I’ve done something wrong on the clientside, or on the serverside.
Debugger-info-overview
Debugger-info-detailed

So the question is: How can I display the image on the clientside?

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1 Answer

  1. Editorial Team

    I went with the approach described as the accepted answer here: Help getting image from Servlet to JSP page

    Which pretty much means I didn’t really answer the initial question, I still can’t handle a raw image clientside. Rather, I use one service to store the image, return the id of where the image is stored, and set the src attr of the image to a service that will return the image.

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