java iText：成功调整一页pdf的大小，但当pdf文档中有多个页面时失败
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iText: Successfully resize one page pdf, but fail when there are multiple pages in the pdf document
提问by Thang Pham
I need to resize every page in my pdf from letter to legal size. Here is what I got so far
我需要将 pdf 中的每一页从字母大小调整为合法大小。这是我到目前为止所得到的
public void resize (float x, float y, float scale) throws Exception {
PdfReader reader = new PdfReader(pdfIn);
Document doc = new Document(PageSize.LEGAL, 0, 0, 0, 0);
PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(pdfOut));
doc.open();
PdfContentByte cb = writer.getDirectContent();
for(int i=1; i<=reader.getNumberOfPages(); i++){
PdfImportedPage page = writer.getImportedPage(reader, i);
cb.addTemplate(page, scale, 0, 0, scale, x, y);
}
doc.close();
}
Even though the resize is correct, the output pdf only contain 1 page. Any help please?
即使调整大小正确，输出 pdf 也只包含 1 页。请问有什么帮助吗？
回答by Thang Pham
Here is the answer. I need doc.newPage()in the loop, read Marc Bcomment on my original question for more information
这是答案。我需要doc.newPage()在循环中，阅读Marc B对我的原始问题的评论以获取更多信息
public void resize (float x, float y, float scale) throws Exception {
PdfReader reader = new PdfReader(pdfIn);
Document doc = new Document(PageSize.LEGAL, 0, 0, 0, 0);
PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(pdfOut));
doc.open();
PdfContentByte cb = writer.getDirectContent();
for(int i=1; i<=reader.getNumberOfPages(); i++){
doc.newPage();
PdfImportedPage page = writer.getImportedPage(reader, i);
cb.addTemplate(page, scale, 0, 0, scale, x, y);
}
doc.close();
}
