itextpdf往已有的pdf加入图片

PdfReader pdfReader = null;
PdfStamper pdfStamper = null;
try { 
    String newPdfPath = "E:\\newPdfTemplate.pdf";
    String srcPdfPath = "E:\\srcTemplate.pdf";

    pdfReader = new PdfReader(srcPdfPath);
    FileOutputStream out = new FileOutputStream(newPdfPath);
    pdfStamper = new PdfStamper(pdfReader, out);
    PdfContentByte pdfContentByte = pdfStamper.getOverContent(1);

　　 // 二维码宽度 单位pt
　　 float qrWidth = 12.75f / 25.4f * 72;

    Image qrcodeImage = Image.getInstance("E:\\wxmincode.jpg");
    qrcodeImage.scaleToFit(qrWidth, qrWidth);
    
    // pdf 坐标 从左到右 从下到上 单位pt
    qrcodeImage.setAbsolutePosition(0, 0);
    pdfContentByte.addImage(qrcodeImage);

    pdfContentByte.stroke();
    pdfStamper.close();
}catch (Exception ex) {
    System.out.println(ex.getMessage());
}finally {
    if (pdfReader != null) {
        pdfReader.close();
    }
}