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xunder.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();}}}