try (OFDReader reader = new OFDReader(srcP);
             OFDDoc ofdDoc = new OFDDoc(reader, outP)) {
            Double width = ofdDoc.getPageLayout().getWidth();
            Double height = ofdDoc.getPageLayout().getHeight();
            Annotation annotation = new Annotation(new ST_Box(0d, 0d, width, height), AnnotType.Watermark, ctx -> {
                ctx.save();
                ctx.setGlobalAlpha(0.1);
                ctx.rotate(45);
                ctx.drawImage(imgP, 0, 0);
                ctx.restore();
            });
            ofdDoc.addAnnotation(1, annotation);
        }
        System.out.println("生成文档位置：" + outP.toAbsolutePath());
    }