spring boot文件下载加水印(pdf,word,pdf,照片,excel)

<repositories><repository><id>com.e-iceblue</id><url>https://repo.e-iceblue.cn/repository/maven-public/</url></repository></repositories><!--        pdf加水印--><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13</version></dependency><!--办公文件加水印--><dependency><groupId>e-iceblue</groupId><artifactId>spire.office.free</artifactId><version>5.2.0</version></dependency>

1.首先导入依赖

2.创建工具类

3.创建加入水印,(我这里水印是图片）

 public static BufferedImage createWatermarkImage(WaterMarkContent watermark) {if (watermark == null) {watermark = new WaterMarkContent();watermark.setEnable(true);watermark.setText(SecurityUtils.getLoginUser().getUser().getNickName());watermark.setColor("#C5CBCF");watermark.setDateFormat("yyyy-MM-dd HH:mm");}String[] textArray = watermark.getText().split(",");Font font = new Font("microsoft-yahei", Font.PLAIN, 20);Integer width = 300;Integer height = 100;BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// 背景透明 开始Graphics2D g = image.createGraphics();image = g.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);g.dispose();// 背景透明 结束g = image.createGraphics();// 设定画笔颜色g.setColor(new Color(Integer.parseInt(watermark.getColor().substring(1), 16)));// 设置画笔字体g.setFont(font);// 设定倾斜度g.shear(0.1, -0.26);// 设置字体平滑g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);int y = 50;for (int i = 0; i < textArray.length; i++) {// 画出字符串g.drawString(textArray[i], 0, y);y = y + font.getSize();}// 画出字符串g.drawString(DateUtils.parseDateToStr(DateUtils.YYYY_MM_DD_HH_MM_SS, new Date()), 0, y);// 释放画笔g.dispose();return image;}

然后就是生成各种文件水印了

/*** excel文件添加水印图片** @param workbook* @param bfi* @param os* @throws Exception*/public static void setWaterMarkToExcel(XSSFWorkbook workbook, BufferedImage bfi, OutputStream os) throws Exception {ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();ImageIO.write(bfi, "png", byteArrayOut);int pictureIdx = workbook.addPicture(byteArrayOut.toByteArray(), Workbook.PICTURE_TYPE_PNG);//add relation from sheet to the picture dataPOIXMLDocumentPart poixmlDocumentPart = workbook.getAllPictures().get(pictureIdx);for (int i = 0; i < workbook.getNumberOfSheets(); i++) {XSSFSheet xssfSheet = workbook.getSheetAt(i);PackagePartName ppn = poixmlDocumentPart.getPackagePart().getPartName();String relType = XSSFRelation.IMAGES.getRelation();PackageRelationship pr = xssfSheet.getPackagePart().addRelationship(ppn, TargetMode.INTERNAL, relType, null);xssfSheet.getCTWorksheet().addNewPicture().setId(pr.getId());}workbook.write(os);}

/*** word文档设置水印图片** @param filePath 文件路径* @param bfi      bfi* @throws IOException ioexception*/public static String setWaterMarkToWord(String filePath, BufferedImage bfi) throws IOException {ByteArrayOutputStream out = new ByteArrayOutputStream();ImageIO.write(bfi, "png", out);Document document = new Document();document.loadFromFile(filePath);PictureWatermark picture = new PictureWatermark();InputStream input = new ByteArrayInputStream(out.toByteArray());//设置图片picture.setPicture(input);//设置图片大小picture.setScaling(SIZE);//是否冲刷，true->图片色彩变淡，false->原色彩picture.isWashout(true);//保存文档document.setWatermark(picture);String downLoadPath = filePath.substring(0, filePath.lastIndexOf("/") + 1) + System.currentTimeMillis() + "_" + StrUtil.subAfter(filePath, "/", true);document.saveToFile(downLoadPath, FileFormat.Docx);return downLoadPath;}/***   pdf加水印图片** @param filePath 文件路径* @param bfi      bfi* @return {@link String}* @throws IOException       ioexception* @throws DocumentException 文件异常*/public static String setWaterMarkToPdf(String filePath, BufferedImage bfi) throws IOException, DocumentException {PdfReader reader=new PdfReader(filePath);//保存路径String downloadPath = filePath.substring(0, filePath.lastIndexOf("/") + 1) +System.currentTimeMillis() + "_" + StrUtil.subAfter(filePath, "/", true);PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(downloadPath));ByteArrayOutputStream out = new ByteArrayOutputStream();ImageIO.write(bfi, "png", out);//将图片放入pdf中com.itextpdf.text.Image image= com.itextpdf.text.Image.getInstance(out.toByteArray());//获取pdf页数int num = reader.getNumberOfPages();com.itextpdf.text.Rectangle pageSize;float width = 0f;float height = 0f;int x = 0;for (int i = 1; i < num; i++) {//得到页面大小x++;if (x == 1) {pageSize=reader.getPageSize(i);width=pageSize.getWidth();height=pageSize.getHeight();}//水印图片设置在内容之上，之下用getUnderContentPdfContentByte pdfContentByte = stamper.getOverContent(i);//设置图片的位置，参数Image.UNDERLYING是作为文字的背景显示。image.setAlignment(com.itextpdf.text.Image.UNDEFINED);//设置图片的绝对位置image.setAbsolutePosition((width - image.getWidth()) / 2,(height -image.getHeight()) / 2 );pdfContentByte.addImage(image);}stamper.close();reader.close();return downloadPath;}/*** ppt加水印图片** @param filePath 文件路径* @param bfi      bfi* @return {@link String}*/public static String setWaterMarkToPpt(String filePath,BufferedImage bfi) throws Exception {Presentation presentation=new Presentation();presentation.loadFromFile(filePath);//将图片转字节码ByteArrayOutputStream out = new ByteArrayOutputStream();//将图片转字节码ImageIO.write(bfi, "png", out);//将字节码转为输入流InputStream input = new ByteArrayInputStream(out.toByteArray());IImageData image = presentation.getImages().append(input);//获取幻灯片背景属性，设置图片填充SlideCollection slides = presentation.getSlides();for (int i = 0; i < slides.size(); i++) {slides.get(i).getSlideBackground().setType(BackgroundType.CUSTOM);slides.get(i).getSlideBackground().getFill().setFillType(FillFormatType.PICTURE);slides.get(i).getSlideBackground().getFill().getPictureFill().setFillType(PictureFillType.STRETCH);slides.get(i).getSlideBackground().getFill().getPictureFill().getPicture().setEmbedImage(image);}//保存文档String downloadPath = filePath.substring(0, filePath.lastIndexOf("/") + 1) +System.currentTimeMillis() + "_" + StrUtil.subAfter(filePath, "/", true);presentation.saveToFile(downloadPath, com.spire.presentation.FileFormat.PPSX_2013);return downloadPath;}/*** 图片加水印** @param filePath 文件路径* @param bfi      bfi* @return {@link String}*/public static String setWaterMarkToImg(String filePath,BufferedImage bfi) throws IOException {//获取画布BufferedImage read=ImageIO.read(new File(filePath));Graphics2D graphics=read.createGraphics();//缩放水印图片int width=bfi.getWidth();int height=bfi.getHeight();//设置比例float f=getScale(width,height,0.5f);//获取缩放后的宽度int w= (int) (width*f);int h= (int) (height*f);//缩放图片Image image = bfi.getScaledInstance(w, h, Image.SCALE_SMOOTH);//设置透明度，0->1，逐渐不透明graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,ALPHA_IMG));//添加水印并设置在图片的右下角graphics.drawImage(image,read.getWidth() -w,read.getHeight()-h,null);//释放资源graphics.dispose();//保存图片String downloadPath = filePath.substring(0, filePath.lastIndexOf("/") + 1) +System.currentTimeMillis() + "_" + StrUtil.subAfter(filePath, "/", true);ImageIO.write(read, filePath.substring(filePath.lastIndexOf(".") + 1), new File(downloadPath));return downloadPath;}/*** 获得图片比例** @param width  宽度* @param height 高度* @param f      f* @return float*/public static float getScale(int width, int height, float f) {if (width > 3000) {f = 0.06f;}if (width > 1000 && width < 3000) {f = 0.1f;}if (width > 300 && width < 1000) {f = 0.3f;}return f;}

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