pdf加自定义水印

获取图片水印

@ApiOperation(value = "获取图片水印")
    @PostMapping("/postImageMark")
    @ApiImplicitParams({
            @ApiImplicitParam(paramType = "header", dataType = "string", name = "Authorization", value = "访问凭证", required = false)
    })
    public void postImageMark(@RequestBody PostImageMarkReq request, HttpServletResponse response) throws Exception {
        try {
            Common.logger.info("获取图片水印-文字内容:{}", request.getContent());
            OutputStream out = response.getOutputStream();
            String filename = request.getFilename();
            InputStream in = minioService.getObject(minioConfig.getBucketName(), filename);

            if(filename.endsWith("pdf")) {
                PDFUtils.addWaterMarkForSteam(in, out, request.getContent());
            } else {
                response.setContentType("image/jpg");
                WaterMarkUtil.markimagebyio(request.getContent(), in, out, "jpg");
            }

            in.close();
            out.close();
        } catch (Exception e) {
            Common.logger.error("图片下载异常！", e);
        }
    }

添加水印

public static void addWaterMarkForSteam(InputStream inputStream, OutputStream outputStream, String waterMarkName) {
        PdfReader reader = null;
        PdfStamper stamper = null;
        try {
            reader = new PdfReader(inputStream);
            stamper = new PdfStamper(reader, outputStream);
            BaseFont base = BaseFont.createFont(FONT_REAL_PATH, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            PdfGState gs = new PdfGState();
            //填充不透明度 为1完全不透明
            gs.setFillOpacity(0.2f);
            //笔画不透明度， 为1完全不透明
            gs.setStrokeOpacity(0.2f);
            int total = reader.getNumberOfPages();
            JLabel label = new JLabel();
            label.setText(waterMarkName);
            PdfContentByte under;
            for (int i = 0; i < total; i++) {
                //页宽度
                float x = reader.getPageSize(i + 1).getWidth();
                //页高度
                float y = reader.getPageSize(i + 1).getHeight();
                under = stamper.getOverContent(i + 1);
                under.setGState(gs);
                under.beginText();//开始写入
                //字体大小x
                under.setFontAndSize(base, 16);
                //每页7行，一行3个
                for (int j = 0; j < 3; j++) {
                    for (int k = 0; k < 5; k++) {
                        //showTextAligned 方法的参数（文字对齐方式，位置内容，输出水印X轴位置，Y轴位置，旋转角度）
                        under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, x / 3 * j + 90, y / 5 * k, 30);
                    }
                }
                under.endText();//结束写入
            }
        } catch (Exception e) {
            Common.logger.error("PDF加水印异常", e);
        } finally {
            try {
                if (stamper != null) {
                    stamper.close();
                }
            } catch (IOException | com.itextpdf.text.DocumentException e) {
                Common.logger.error("PDF加水印异常", e);
            }
            if (reader != null) {
                reader.close();
            }
        }
    }