PDFBox 2.0.7 無法設定 XFA

Question

我正在尝试在具有动态输入字段的 pdf 表单中设置值，但我不断收到流编写器的错误。

我已经研究了填写表格的步骤（http://mail-archives.apache.org/mod_mbox/pdfbox-users/201510.mbox/browser）并阅读了类似的问题 将XFA与PDFBox和PDFBox臃肿的PDF文件大小

相结合

有没有不同的方法可以做到这一点？有什么提示可以引导我走向正确的方向吗？

这是我的代码

PDDocument doc = null;
FileOutputStream fos = null;
COSStream cosout = null;
try {
    doc = PDDocument.load(new File(pdfTemplatePath));
    doc.setAllSecurityToBeRemoved(true);
    PDDocumentCatalog cat = doc.getDocumentCatalog();
    PDAcroForm aform = cat.getAcroForm();
    if (aform.hasXFA()) {
        PDXFAResource xfa = aform.getXFA();
        org.w3c.dom.Document xmlDoc = xfa.getDocument();
        Node xfaData = xmlDoc.getElementsByTagName("xfa:data").item(0);
        HashMap<String, String> xmlFields = new HashMap<String, String>();
        setDataElements(xfaData, xmlFields); //I set node contents here
        //System.out.println(xmlFields);
        cosout = new COSStream(new ScratchFile(new File("C://tests//")));
        TransformerFactory.newInstance().newTransformer()
                .transform(new DOMSource(xmlDoc), new StreamResult(cosout.createOutputStream()));
        PDXFAResource resout = new PDXFAResource(cosout);
        aform.setXFA(resout);
    }
    fos = new FileOutputStream(tempFilePath);
    doc.save(fos);
    doc.close();
} catch (Exception e) {
    e.printStackTrace();
    success = false;
} catch (Error err) {
    err.printStackTrace();
    success = false;
} finally {
    if (doc != null)
        doc.close();
    if (fos != null)
        fos.close();
    if (cosout != null)
        cosout.close();
}

这是我得到的错误

*java.lang.IllegalStateException: Cannot read while there is an open stream writer
        at org.apache.pdfbox.cos.COSStream.createRawInputStream(COSStream.java:133)
        at org.apache.pdfbox.pdfwriter.COSWriter.visitFromStream(COSWriter.java:1203)
        at org.apache.pdfbox.cos.COSStream.accept(COSStream.java:388)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteObject(COSWriter.java:522)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteObjects(COSWriter.java:460)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteBody(COSWriter.java:444)
        at org.apache.pdfbox.pdfwriter.COSWriter.visitFromDocument(COSWriter.java:1099)
        at org.apache.pdfbox.cos.COSDocument.accept(COSDocument.java:419)
        at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1370)
        at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1257)
        at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1278)*

我

尝试在保存文档之前关闭流（我没有看到有人在我阅读的示例中这样做），但后来我遇到了另一个错误

*java.io.IOException: COSStream has been closed and cannot be read. Perhaps its enclosing PDDocument has been closed?
        at org.apache.pdfbox.cos.COSStream.checkClosed(COSStream.java:82)
        at org.apache.pdfbox.cos.COSStream.createRawInputStream(COSStream.java:130)
        at org.apache.pdfbox.pdfwriter.COSWriter.visitFromStream(COSWriter.java:1203)
        at org.apache.pdfbox.cos.COSStream.accept(COSStream.java:388)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteObject(COSWriter.java:522)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteObjects(COSWriter.java:460)
        at org.apache.pdfbox.pdfwriter.COSWriter.doWriteBody(COSWriter.java:444)
        at org.apache.pdfbox.pdfwriter.COSWriter.visitFromDocument(COSWriter.java:1099)
        at org.apache.pdfbox.cos.COSDocument.accept(COSDocument.java:419)
        at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1370)
        at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1257)
        at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1278)*

任何帮助都非常感谢

Answer 1

我用document.getDocument().createCOSStream()解决了这个问题，正如蒂尔曼·豪舍尔建议的那样，并在设置 XFA 资源后关闭创建的输出流，代码如下所示

COSStream cs = doc.getDocument().createCOSStream();
OutputStream os = cs.createOutputStream();
Result outputTarget = new StreamResult(os);
Transformer t = TransformerFactory.newInstance().newTransformer();
t.transform(new DOMSource(xmlDoc), outputTarget);
PDXFAResource resout = new PDXFAResource(cs);
aform.setXFA(resout);
os.close();
doc.save( "test.pdf" );