为什么生成的PDF在Internet Explorer中正确显示，而在FireFox或Chrome中却不能正确显示？

Question

I'm generating PDFs in Java using lowagie/iTextPDF and am having a problem displaying the output in Firefox and Chrome, but IE8 displays them fine.

Firefox and Chrome display gibberish, like this:

%PDF-1.4 % 2 0 obj <>stream x 1?B1 C # @ ?0# ?Tm>}Zh nO?8 1 a غ y ӓ?B $ :9XC a. /f{ $ o -$?Ө ^ c / 'E j }WT / Y< ? 5* endstream endobj 4 0 obj <>>>/MediaBox[0 0 612 1008]/Rotate 90>> endobj 1 0 obj <> endobj 3 0 obj <> endobj 5 0 obj <> endobj 6 0 obj <> endobj xref 0 7 0000000000 65535 f 0000000379 00000 n 0000000015 00000 n 0000000467 00000 n 0000000211 00000 n 0000000530 00000 n 0000000575 00000 n trailer <]/Info 6 0 R/Size 7>> startxref 697 %%EOF

Here's part of the servlet code:

ByteArrayOutputStream baos = new ByteArrayOutputStream();                      
Document reportPDFDocument = (Document)generateReport(request,conn,baos);             
PdfWriter.getInstance(reportPDFDocument, baos);
response.setHeader("Expires", "0");
response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
response.setHeader("Pragma", "public");
response.setContentType("application/pdf");       
response.setHeader("Content-disposition","inline; filename=PrintedSchedule.pdf");
ServletOutputStream out = response.getOutputStream();
baos.writeTo(out);
out.flush();

I've already tried updating Firefox, updating the PDF plugin, and making sure it was set to use Adobe's PDF viewer instead of Firefox's viewer.

As a test, I changed this line:

From:

 response.setHeader("Content-disposition","inline; filename=PrintedSchedule.pdf");

To:

 response.setHeader("Content-disposition","attachment; filename=PrintedSchedule.pdf");

Internet Explorer seems to recognize that it's a PDF that's being downloaded. I get a popup window in IE that says:

But FireFox thinks it's an 'htm' document, and gives this:

In Firefox I then choose Adobe Reader to open it with, and it works OK. But In the title bar I noticed that it appended '.htm' to the end of the file name.

Could this be a clue as to the problem? If so, how can I force Firefox to recognize it as a PDF? The users want the PDF to display in the browser, not in a popup window, and they don't want to have to download the PDF files separately.

Answer 1

Per http://itextpdf.com/examples/iia.php?id=173 you are forgetting to set content length, try adding response.setContentLength(baos.size()); before ServletOutputStream out = response.getOutputStream();

Answer 2

Try adding

response.setHeader("Expires", "0");
response.setHeader("Cache-Control","must-revalidate, post-check=0, pre-check=0");
response.setHeader("Pragma", "public");
// setting the content type
response.setContentType("application/pdf");
// the contentlength
response.setContentLength(baos.size());
// write ByteArrayOutputStream to the ServletOutputStream
OutputStream os = response.getOutputStream();
baos.writeTo(os);
os.flush();
os.close();

after closing document.close();

Answer 3

我对此有答案，我通过在新选项卡中打开.PDF文件成功完成了，从开发角度来看单击按钮或链接目标应为空白，例如（target = _blank）