Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
278 views
in Technique[技术] by (71.8m points)

java - Render image from servlet in flyingsaucer generated pdf

I'm using flyingsaucer to render an xhtml document to pdf through a servlet which returns the generated pdf document. The xhtml document features an image which is requested from another servlet. The image servlet checks who is logged in before returning the appropriate image. The code below shows how the image is requested:

<img height="140" width="140" src="http://localhost:8080/myapp/servlet/DisplayPic" />

My problem is that the http request for the image is from the pdf renderer and not the logged in user so the image servlet doesn't know who's logged in and therefore the desired image is not returned.

I'm currently using the code below to render the xhtml document:

ITextRenderer renderer = new ITextRenderer();
renderer.setDocumentFromString(xhtmlDocumentAsString);
renderer.layout();
os = response.getOutputStream();
renderer.createPDF(os);

I need to either maintain the user's session when the image servlet is requested or provide the renderer with the image to use for that specific xhtml element. I think the latter can be done using a ReplacedElementFactory but I haven't been able to dig out any example code that can help me.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

I've got this working very nicely now. Here's the code.

In my xhtml document i have:

<div class="profile_picture" style="display:block;width:140px;height:140px;" />

(I'm using a div element instead of img as the factory is only used for block level elements)

I render my document using:

ITextRenderer renderer = new ITextRenderer();
renderer.getSharedContext().setReplacedElementFactory(new ProfileImageReplacedElementFactory(renderer.getSharedContext().getReplacedElementFactory()));
renderer.setDocumentFromString(xhtmlDocumentAsString);
renderer.layout();
os = response.getOutputStream();
renderer.createPDF(os);

And i have my own ReplacedElementFactory as below:

public class ProfileImageReplacedElementFactory implements ReplacedElementFactory {

    private final ReplacedElementFactory superFactory;

    public ProfileImageReplacedElementFactory(ReplacedElementFactory superFactory) {
        this.superFactory = superFactory;
    }

    @Override
    public ReplacedElement createReplacedElement(LayoutContext layoutContext, BlockBox blockBox,
            UserAgentCallback userAgentCallback, int cssWidth, int cssHeight) {

        Element element = blockBox.getElement();
        if (element == null) {
            return null;
        }

        String nodeName = element.getNodeName();
        String className = element.getAttribute("class");
        if ("div".equals(nodeName) && className.contains("profile_picture")) {

            InputStream input = null;
            try {
                input = ...;
                byte[] bytes = IOUtils.toByteArray(input);
                Image image = Image.getInstance(bytes);
                FSImage fsImage = new ITextFSImage(image);

                if (fsImage != null) {
                    if ((cssWidth != -1) || (cssHeight != -1)) {
                        fsImage.scale(cssWidth, cssHeight);
                    }
                    return new ITextImageElement(fsImage);
                }
            } catch (IOException e) {
                getLogger().error(ExceptionUtils.getStackTrace(e));
            } catch (BadElementException e) {
                getLogger().error(ExceptionUtils.getStackTrace(e));
            } finally {
                IOUtils.closeQuietly(input);
            }
        }

        return superFactory.createReplacedElement(layoutContext, blockBox, userAgentCallback, cssWidth, cssHeight);
    }

    @Override
    public void reset() {
        superFactory.reset();
    }

    @Override
    public void remove(Element e) {
        superFactory.remove(e);
    }

    @Override
    public void setFormSubmissionListener(FormSubmissionListener listener) {
        superFactory.setFormSubmissionListener(listener);
    }
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...