这就是答案。我需要doc.newPage()循环，请阅读Marc B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();
}
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