java 从 PDF 中删除页面
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Remove page from PDF
提问by AlanFoster
I'm currently using iText and I'm wondering if there is a way to delete a page from a PDF file?
我目前正在使用 iText，我想知道是否有办法从 PDF 文件中删除页面？
I have opened it up with a reader etc., and I want to remove a page before it is then saved back to a new file; how can I do that?
我已经用阅读器等打开了它，我想在将页面保存回新文件之前删除它；我怎样才能做到这一点？
回答by AlanFoster
The 'better' way to 'delete' pages is doing
“删除”页面的“更好”方法是
reader.selectPages("1-5,10-12");
Which means we only select pages 1-5, 10-12 effectively 'deleting' pages 6-9.
这意味着我们只选择第 1-5、10-12 页有效地“删除”第 6-9 页。
回答by Ankit Sharma
Get the reader of existing pdf file by
通过以下方式获取现有 pdf 文件的阅读器
PdfReader pdfReader = new PdfReader("source pdf file path");
Now update the reader by
现在更新读者
pdfReader.selectPages("1-5,15-20");
then get the pdf stamper object to write the changes into a file by
然后获取 pdf 压模对象以将更改写入文件
PdfStamper pdfStamper = new PdfStamper(pdfReader,
new FileOutputStream("destination pdf file path"));
close the PdfStamper by
通过以下方式关闭 PdfStamper
pdfStamper.close();
It will close the PdfReader too.
它也会关闭 PdfReader。
Cheers.....
干杯.....
回答by Jes
回答by Pavel Vlasov
Here is a removing function ready for real life usage. Proven to work ok with itext 2.1.7. It does not use "strigly typing" also.
这是一个可以在现实生活中使用的删除功能。经证明可以正常工作itext 2.1.7。它也不使用“严格打字”。
/**
* Removes given pages from a document.
* @param reader document
* @param pagesToRemove pages to remove; 1-based
*/
public static void removePages(PdfReader reader, int... pagesToRemove) {
int pagesTotal = reader.getNumberOfPages();
List<Integer> allPages = new ArrayList<>(pagesTotal);
for (int i = 1; i <= pagesTotal; i++) {
allPages.add(i);
}
for (int page : pagesToRemove) {
allPages.remove(new Integer(page));
}
reader.selectPages(allPages);
}
回答by Ray Hulha
For iText 7 I found this example:
对于 iText 7，我找到了这个例子：
PdfReader pdfReader = new PdfReader(PATH + name + ".pdf");
PdfDocument srcDoc = new PdfDocument(pdfReader);
PdfDocument resultDoc = new PdfDocument(new PdfWriter(PATH + name + "_cut.pdf"));
resultDoc.initializeOutlines();
srcDoc.copyPagesTo(1, 2, resultDoc);
resultDoc.close();
srcDoc.close();
See also here: clone-reordering-pagesand here: clone-splitting-pdf-file
