找不到PDF标题异常

Question

我正在使用iText7和java，我的问题是，当我试图打开一个现有的pdf文件时，这个例外。这是我的密码

    JFileChooser load = new JFileChooser();
    load.setFileFilter(new PdfFilter());
    load.showOpenDialog(this);
    String loadPath = load.getSelectedFile().getAbsolutePath();
//some stuff here....


    path = path.concat(".pdf");//path is declared above


    try {
        pdf = new PdfDocument(new PdfReader(loadPath), new PdfWriter(path));
    } catch (IOException ex) {
        Logger.getLogger(ParagrafoFrame.class.getName()).log(Level.SEVERE, null, ex);
    }

    doc = new Document(pdf);
    doc.add(new Paragraph("test"));
    doc.close();

为什么不起作用？

Answer 1

我的案子我忘了结案：

PdfDocument pdfDoc = new PdfDocument(new PdfWriter(DEST));
Document doc = new Document(pdfDoc);
//...
doc.close(); //HAVE YOU CLOSE?
pdfDoc.close(); //HAVE YOU CLOSE?