将页面添加到现有PDF com.itextpdf.text.exceptions.InvalidPdfException：找不到PDF标题签名 [英] Adding page to existing PDF com.itextpdf.text.exceptions.InvalidPdfException: PDF header signature not found

问题描述

我正在尝试使用Java 1.5使用iText 1.02b向已创建的PDF添加页面。当我将新页面添加到现有PDF时，我得到了包含的异常。以下是我们遇到问题的方法中的代码。

I am trying to add a page to an already created PDF using iText 1.02b using Java 1.5. When I add the new page to the existing PDF I get the exception that I included. Here is the code in the method we are having the issue.

public static File addSignaturePageToPDF(String fileName, InputStream fileInputStream, SignatureTemplateInfo signaturePageInfo, HttpServletRequest argRequest) throws Exception {

int splitIdx = fileName.lastIndexOf(".");
        File signedFile = File.createTempFile(fileName.substring(0,splitIdx), fileName.substring(splitIdx));
        SignatureModel signatureModel = SignatureHelper.getSignatureModel(signaturePageInfo.getCaseHeaders(), signaturePageInfo.getEventSubTp(), signaturePageInfo.getSignatureId(), argRequest);

        byte[] signaturePdfAsBytes = SignatureHelper.createSignature(signatureModel, argRequest);
        byte[] mainPdfAsBytes = getByteArrayFromInputStream(fileInputStream);
    PdfReader mainPdfReader = new PdfReader(mainPdfAsBytes);  << Exception here
    PdfReader signaturePdfReader = new PdfReader(signaturePdfAsBytes); 

例外：

com.itextpdf.text.exceptions.InvalidPdfException: PDF header signature not found.
    at com.itextpdf.text.pdf.PRTokeniser.checkPdfHeader(PRTokeniser.java:205)
    at com.itextpdf.text.pdf.PdfReader.readPdf(PdfReader.java:496)
    at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:189)
    at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:178)
    at icis.common.util.ConvertDocument.addSignaturePageToPDF(ConvertDocument.java:96)
    at icis.cr.common.file.ViewFileAction.executeProcess(ViewFileAction.java:71)
    at icis.common.action.BaseICISAction.execute(BaseICISAction.java:134)
    at icis.cr.common.BaseCRAction.execute(BaseCRAction.java:41)

谢谢。

推荐答案

该异常告诉您从第一个字节获取的你的 fileInputStream 不等于'％'，'P'，'D'，'F'，' - '，'1'，'。'。

The exception tells you that the first bytes obtained from your fileInputStream aren't equal to '%', 'P', 'D', 'F', '-', '1', '.'.

也许您要检查的文件是空的，可能无法正确读取 InputStream ，...

Maybe the file you're trying to inspect is empty, maybe the InputStream can't be read correctly,...

许多人遇到并修复了同样的问题：

Many people before you have encountered and fixed the same problem:

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您应该通过将 mainPdfAsBytes 保存到文件并检查该文件来调试代码。它真的是一个PDF文件吗？ iText告诉你它不是以％PDF-1开头。。

You should debug your code, by saving mainPdfAsBytes to a file and by examining that file. Is it really a PDF file? iText tells you it doesn't start with %PDF-1..

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