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我有一个现有的 pdf，我需要向它添加页眉（图像）和页脚（页码）。我试过 PDFStamper 和 HeaderFooter 类。页眉和页脚与 PDFStamper 一起显示，但现有文本在页眉和页脚上重叠。
如何压缩页眉和页脚之间的现有内容？