无法在 pdf 中渲染图像：grails

Question

below is my code-

    ApplicationTagLib applicationTagLib = new ApplicationTagLib()
    String html = applicationTagLib.include(controller: 'survey', action: 'pdf', params: [id: id])
    html = html.replaceAll('&', '&')
    html = html.replaceAll('&#', '&#')
    html = html.replaceAll(' ', ' ')

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    String baseUrl = "http://localhost:8080/"
    ITextRenderer renderer = new ITextRenderer();
    renderer.setDocumentFromString(content);
    renderer.layout();
    renderer.createPDF(baos);
    byte[] data = baos.toByteArray();

    response.setHeader("Content-disposition", "attachment;filename=report.pdf")
    response.setContentType("application/pdf")
    OutputStream out = response.getOutputStream();
    out.write(data);
    out.flush();
    out.close()

In pdf action of survey Contrller-

render(view: 'download')

download.gsp

<g:img dir="assets/common" file="pointer.jpg"/>
<img src="assets/common/pin.png"/>

pdf we are getting have all data except these image

Note-while I am hitting direct pdf action of survey contrller this is renderring image fine.[ localhost:8080/survey/pdf ]

Answer 1

When generating PDF the relative path/source does not work for static resources. You have to provide the absolute path/source for them.

You should not hard code your baseUrl . You can inject the grailsLinkGenerator bean then the baseUrl will be available at grailsLinkGenerator.serverBaseURL .

So you can get the baseUrl in controller through grailsLinkGenerator and then pass it through model to your view. Then your img tag can look like following

    <img src="${baseUrl}/assets/common/pin.png"/>