JPEGImageEncoder don't work in JDK 7

问题

I try to make captcha using JCaptcha Component and i need to encode image in related servlet. So according to JCaptcha Tutorial, I should use JPEGImageEncoder and it's not compatible with JDK7. What else can i do?
here is related part of code:

     ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
     BufferedImage challenge =
             CaptchaServiceSingleton.getInstance().getImageChallengeForID(captchaId,
                     httpServletRequest.getLocale());
   JPEGImageEncoder jpegEncoder =
                 JPEGCodec.createJPEGEncoder(jpegOutputStream);
         jpegEncoder.encode(challenge);
     } catch (IllegalArgumentException e) {
         httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
         return;
     } catch (CaptchaServiceException e) {
         httpServletResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
         return;
     }

回答1:

Use ImageIO:

// Image writer
    ImageWriter imageWriter = (ImageWriter)ImageIO.getImageWritersBySuffix("jpeg").next();
    ImageOutputStream ios = ImageIO.createImageOutputStream(jpegOutputStream);
    imageWriter.setOutput(ios);
    IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(challenge), null);
    imageWriter.write(imageMetaData, new IIOImage(challenge, null, null), null);

This is replacing the deprecated JPEG functions

来源：https://stackoverflow.com/questions/28579709/jpegimageencoder-dont-work-in-jdk-7