在现有pdf的itext中附加数据 [英] Appending a data in itext in existing pdf

问题描述

我正在使用 itext pdf 库。我想在现有pdf的末尾添加一个内容。

I am working with itext pdf library. I want to add a content at the end of the existing pdf.

比如说现有的pdf（比如Original.pdf）说4页，所以我想要添加另一页，即第5页，内容 Hello World我添加内容并将其保存在相同的pdf中，即 Original.pdf

Say for example the existing pdf(say Original.pdf) is having say 4 pages, so I want to add another page i.e. page no 5 with content Hello World I am added content and save it in the same pdf i.e. Original.pdf

关闭后，我的Original.pdf将包含 5 页面，即 4页（已有默认内容）+ 1页，内容 Hello World我添加了内容

So after closing my Original.pdf will contain 5 pages i.e 4 pages(with default content they already have) + 1 page with content Hello World I am added content

我正在使用此代码但显示异常

I am using this code but showing an exception

        String in="Original.pdf";
        String out="Original.pdf";        

        PdfReader reader = new PdfReader(in);
        PdfStamper stamper = new PdfStamper(reader,new FileOutputStream(out));

        int totalPages=reader.getNumberOfPages();
        stamper.insertPage(totalPages+1, PageSize.A4);
        stamper.addAnnotation(
                                PdfAnnotation.createText(
                                                            stamper.getWriter(),
                                                            new Rectangle(30f, 750f, 80f, 800f),
                                                            "inserted page", "This page is the title page.",
                                                            true,
                                                            null)
                                ,
                                reader.getNumberOfPages()
                             );
        stamper.close();

java.io.EOFException

提前致谢。

推荐答案

我认为问题来自于您使用 FileOutputStream 和同一文件上的 FileInputStream 。

I think the problem comes from the fact that you are using a FileOutputStream and a FileInputStream on the same file.

我会建议在ByteArrayOutputStream上保存pdf，关闭压模，然后在文件中保存 ByteArrayOutputStream 。

I would recommand to save on ByteArrayOutputStream the pdf, close the stamper, and then save the ByteArrayOutputStream in your file.

I使用了 IOUtils.write（byte []数据，OutputStream输出）方法在 FileOutputStream 中保存 ByteArrayOutputStream 。

I've used IOUtils.write(byte[] data, OutputStream output) method to save the ByteArrayOutputStream in the FileOutputStream .

我已经测试了这个并且它有效：

I've tested this and it works:

    String in = "Original.pdf";
    String out = "Original.pdf";

    PdfReader reader = new PdfReader(in);

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    PdfStamper stamper = new PdfStamper(reader, baos );

    int totalPages = reader.getNumberOfPages();
    stamper.insertPage(totalPages + 1, PageSize.A4);
    stamper.addAnnotation(PdfAnnotation.createText(stamper.getWriter(), new Rectangle(30f, 750f, 80f, 800f), "inserted page", "This page is the title page.", true, null),
            reader.getNumberOfPages());
    stamper.close();

    FileOutputStream fileOutputStream = new FileOutputStream(out);
    IOUtils.write(baos.toByteArray(), fileOutputStream);

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