iText - 在循环中读取pdf并逐个合并 [英] iText - Read pdfs in a loop and merge one by one

问题描述

我有一个循环，我每次都读取一个pdf文件。我想将这些pdf文件添加到另一个最终的pdf中。基本上将所有pdf合并为一个新的pdf文件。

I have a loop where I read a pdf file every time. And I want to add these pdf files into another final pdf. Basically merging all pdfs into one new pdf file.

我尝试了以下方式：

我试图连接byteArrays循环内部像

I tried to concatenate byteArrays inside the loop like

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
for (............){
  outputStream.write(myInfo.getByteArray());
}

pdfreader = new PdfReader(outputStream.toByteArray());
FileOutputStream fileout = new FileOutputStream(file);

PdfStamper pdfStamper = new PdfStamper(pdfreader, fileout);

pdfStamper.close();
pdfreader.close();

最终的pdf没有所有pdf的问题。相反，它只有一个pdf。

The problem the final pdf does not have all the pdfs. Instead it has only one pdf.

而且我不确定这是否是正确的方法。
或者还有其他任何一个一个合并pdfs？

And I am not sure if this is the right way to do it. Or is there any other to merge pdfs one by one ?

推荐答案

查看PdfMerger的文档： itextsupport.com/apidocs/iText7/7.0.3/com/itextpdf/kernel/utils/PdfMerger.html

Have a look at the documentation for PdfMerger: itextsupport.com/apidocs/iText7/7.0.3/com/itextpdf/kernel/utils/PdfMerger.html

如果需要，我可以稍后准备一个例子。

I can prepare an example later if needed.

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