Download image from SVG with Jersey

Question

I have some SVG string from highcharts and I want to download it as an image (PNG). The conversion is done using PNGTranscoder (Batik)

@POST
public Response getChartImage() throws Exception{

    String svg = "<svg xmlns:xlink..."; // can be ignored
    svg = svgDocumentConvertAndRevert(svg); // can be ignored

    TranscoderInput input = new TranscoderInput(new StringReader(svg));

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    TranscoderOutput output = new TranscoderOutput(baos);

    PNGTranscoder transcoder = new PNGTranscoder();
    transcoder.transcode(input, output);

    BufferedImage image = new BufferedImage(300, 500, 1);
    ImageIO.write(image, "png", baos);
    byte[] imageData = baos.toByteArray();

    return Response.ok(imageData).build();

}

but what I'm getting is a bunch of text, something like

�PNG  IHDR�@��E� cHRMz&��...

Tried with @Produces("image/*") but didn't work...

Can I not save it as an image (real file) and allow user to download it? Trying to avoid unnecessary effort..

Thanks!

Answer 1

It was working, just that I was using Chrome's extension POSTman.

Answer 2

You need to set the correct mime type for the response something like

response.setContentType("image/png");

where response is a ServletResponse object.