本文使用jar包pom.xml

<!--水印相关 start--><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.4.3</version></dependency><dependency><groupId>com.lowagie</groupId><artifactId>itext</artifactId><version>2.1.7</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.17</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.17</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>3.17</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>ooxml-schemas</artifactId><version>1.0</version></dependency><!-- word --><dependency><groupId>e-iceblue</groupId><artifactId>spire.doc.free</artifactId><version>5.2.0</version></dependency><!-- excel --><dependency><groupId>e-iceblue</groupId><artifactId>spire.xls.free</artifactId><version>5.1.0</version></dependency><dependency><groupId>e-iceblue</groupId><artifactId>spire.pdf.free</artifactId><version>5.1.0</version></dependency><!-- ppt --><dependency><groupId>e-iceblue</groupId><artifactId>spire.presentation.free</artifactId><version>5.1.0</version></dependency>

office 相关格式文档的加密主要使用微软提供的Spire.Office for Java ，free部分有针对性每个类型的API说明和示例，请自行参考以下链接。下面也会附上我在项目中的实际工具类。

Spire.Office for Java ｜ 专业的 Java Office 套件 ｜ 创建、修改、转换、打印 Word/PowerPoint/PDF 文档

我的策略是读取原文件，加水印后写入新的文件。工具类三个参数依次为原文件路劲、水印文件路径、水印文字内容。下面详细分解。

public static void main(String[] args) throws IOException {String markText = "cq-tengk "+new SimpleDateFormat("yyyy-MM-dd").format(new Date());String oldFile = "D:/tmp/tmp/test.doc";String newFile = "D:/tmp/res/test.doc";addWordWaterMark(oldFile,newFile,markText);// setWordWaterMark(oldFile,newFile,markText);// addWaterMark(oldFile,newFile,markText);// makeWaterMark(oldFile,newFile,markText);}

PDF加水印

/***pdf文件添加文字水印** @param input 原PDF位置* @param output 输出文件的位置* @param waterMarkName 页脚添加水印*/public static void addPDFWaterMark(String input, String output, String waterMarkName) {BufferedOutputStream bos = null;try {bos = new BufferedOutputStream(new FileOutputStream(new File(output)));com.itextpdf.text.pdf.PdfReader reader = new com.itextpdf.text.pdf.PdfReader(input);com.itextpdf.text.pdf.PdfStamper stamper = new com.itextpdf.text.pdf.PdfStamper(reader, bos);// 获取总页数 +1, 下面从1开始遍历int total = reader.getNumberOfPages() + 1;// 使用classpath下面的字体库com.itextpdf.text.pdf.BaseFont base = null;try {base = com.itextpdf.text.pdf.BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", com.itextpdf.text.pdf.BaseFont.EMBEDDED);} catch (Exception e) {// 日志处理e.printStackTrace();}// 间隔int interval = -15;// 获取水印文字的高度和宽度int textH = 0, textW = 0;JLabel label = new JLabel();label.setText(waterMarkName);FontMetrics metrics = label.getFontMetrics(label.getFont());textH = metrics.getHeight();textW = metrics.stringWidth(label.getText());System.out.println("textH: " + textH);System.out.println("textW: " + textW);// 设置水印透明度com.itextpdf.text.pdf.PdfGState gs = new com.itextpdf.text.pdf.PdfGState();gs.setFillOpacity(0.2f);gs.setStrokeOpacity(0.7f);com.itextpdf.text.Rectangle pageSizeWithRotation = null;PdfContentByte content = null;for (int i = 1; i < total; i++) {// 在内容上方加水印content = stamper.getOverContent(i);// 在内容下方加水印// content = stamper.getUnderContent(i);content.saveState();content.setGState(gs);// 设置字体和字体大小content.beginText();content.setFontAndSize(base, 20);// 获取每一页的高度、宽度pageSizeWithRotation = reader.getPageSizeWithRotation(i);float pageHeight = pageSizeWithRotation.getHeight();float pageWidth = pageSizeWithRotation.getWidth();// 根据纸张大小多次添加， 水印文字成30度角倾斜for (int height = interval + textH; height < pageHeight; height = height + textH * 6) {for (int width = interval + textW; width < pageWidth + textW; width = width + textW * 2) {content.showTextAligned(Element.ALIGN_LEFT, waterMarkName, width - textW, height - textH, 30);}}content.endText();}// 关流stamper.close();reader.close();} catch (FileNotFoundException e) {log.error("PDF加水印失败",e);throw new RuntimeException("PDF makewater fail：生成ppt文件失败");} catch (DocumentException e) {log.error("PDF加水印失败",e);throw new RuntimeException("PDF makewater fail：生成ppt文件失败");} catch (IOException e) {log.error("PDF加水印失败",e);throw new RuntimeException("PDF makewater fail：生成ppt文件失败");}}

Word水印 支持doc和docx

/*** word文字水印** @param inputPath* @param outPath* @param markStr*/public static void addWordWaterMark(String inputPath, String outPath, String markStr) {//加载示例文档Document doc = new Document();doc.loadFromFile(inputPath);//添加艺术字并设置大小ShapeObject shape = new ShapeObject(doc, ShapeType.Text_Plain_Text);shape.setWidth(80);shape.setHeight(20);//设置艺术字文本内容、位置及样式shape.setVerticalPosition(30);shape.setHorizontalPosition(20);shape.setRotation(315);shape.getWordArt().setFontFamily("宋体");shape.getWordArt().setText(markStr);shape.setFillColor(Color.red);shape.setLineStyle(ShapeLineStyle.Single);shape.setStrokeColor(new Color(192, 192, 192, 255));shape.setStrokeWeight(1);Section section;HeaderFooter header;for (int n = 0; n < doc.getSections().getCount(); n++) {section = doc.getSections().get(n);//获取section的页眉header = section.getHeadersFooters().getHeader();Paragraph paragraph;if (header.getParagraphs().getCount() > 0) {//如果页眉有段落，取它第一个段落paragraph = header.getParagraphs().get(0);} else {//否则新增加一个段落到页眉paragraph = header.addParagraph();}for (int i = 0; i < 4; i++) {for (int j = 0; j < 3; j++) {//复制艺术字并设置多行多列位置shape = (ShapeObject) shape.deepClone();shape.setVerticalPosition(50 + 150 * i);shape.setHorizontalPosition(20 + 160 * j);paragraph.getChildObjects().add(shape);}}}//保存文档doc.saveToFile(outPath, FileFormat.Docx_);}

Excel xlsx格式

/*** excel添加水印** @param inputSrc原始文件路径* @param outputSrc生成文件路径* @param waterMarkName 水印内容*/private static void addExcelWaterMark(String inputSrc, String outputSrc, String waterMarkName) {byte[] fileData = OfficeWaterMarkUtil.getBytesByFile(inputSrc);BufferedImage image = createWaterMarkImage(waterMarkName);// 导出到字节流BByteArrayOutputStream os = new ByteArrayOutputStream();try {ImageIO.write(image, "png", os);InputStream sbs = new ByteArrayInputStream(fileData);XSSFWorkbook workbook = new XSSFWorkbook(sbs);int pictureIdx = workbook.addPicture(os.toByteArray(), Workbook.PICTURE_TYPE_PNG);POIXMLDocumentPart poixmlDocumentPart = workbook.getAllPictures().get(pictureIdx);for (int i = 0; i < workbook.getNumberOfSheets(); i++) {//获取每个Sheet表XSSFSheet sheet = workbook.getSheetAt(i);PackagePartName ppn = poixmlDocumentPart.getPackagePart().getPartName();String relType = XSSFRelation.IMAGES.getRelation();PackageRelationship pr = sheet.getPackagePart().addRelationship(ppn, TargetMode.INTERNAL, relType, null);sheet.getCTWorksheet().addNewPicture().setId(pr.getId());}ByteArrayOutputStream bos = new ByteArrayOutputStream();try {workbook.write(bos);} finally {bos.close();}bos.writeTo(new BufferedOutputStream(new FileOutputStream(outputSrc)));} catch (IOException e) {log.error("Excel加水印失败",e);throw new RuntimeException("excel makewater fail：生成ppt文件失败");}}

Excel xls格式

package com.liukuquanshu.thirdparty.util;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.*;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import javax.imageio.ImageIO;import java.awt.Color;import java.awt.Font;import java.awt.*;import java.awt.image.BufferedImage;import java.io.*;import java.text.SimpleDateFormat;import java.util.Date;/*** Excel 加水印工具类 支持xls和xlsx* @author tkai*/public class ExcelWaterMarkUtil {public static void main(String[] args) {String markText = "cq-tengk "+new SimpleDateFormat("yyyy-MM-dd").format(new Date());String oldFile = "D:/tmp/tmp/数科_软件著作权清单.xls";String newFile = "D:/tmp/res/数科_软件著作权清单.xls";setExcelWaterMark(oldFile,newFile,markText);}/**** @param wb Excel Workbook* @param sheet 需要打水印的Excel* @param waterRemark 水印文字* @param startXCol 水印起始列* @param startYRow 水印起始行* @param betweenXCol 水印横向之间间隔多少列* @param betweenYRow 水印纵向之间间隔多少行* @param XCount 横向共有水印多少个* @param YCount 纵向共有水印多少个* @param waterRemarkWidth 水印图片宽度为多少列* @param waterRemarkHeight 水印图片高度为多少行* @throws IOException*/public static void putWaterRemarkToExcel(Workbook wb, Sheet sheet, String waterRemark, int startXCol,int startYRow, int betweenXCol, int betweenYRow, int XCount, int YCount, int waterRemarkWidth,int waterRemarkHeight) throws IOException {// 加载图片ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();BufferedImage bufferImg = createWaterMarkImage(waterRemark);ImageIO.write(bufferImg, "png", byteArrayOut);// 开始打水印Drawing drawing = sheet.createDrawingPatriarch();Drawing<?> drawingPatriarch = sheet.getDrawingPatriarch();// 按照共需打印多少行水印进行循环for (int yCount = 0; yCount < YCount; yCount++) {// 按照每行需要打印多少个水印进行循环for (int xCount = 0; xCount < XCount; xCount++) {// 创建水印图片位置int xIndexInteger = startXCol + (xCount * waterRemarkWidth) + (xCount * betweenXCol);int yIndexInteger = startYRow + (yCount * waterRemarkHeight) + (yCount * betweenYRow);/** 参数定义： 第一个参数是（x轴的开始节点）； 第二个参数是（是y轴的开始节点）； 第三个参数是（是x轴的结束节点）；* 第四个参数是（是y轴的结束节点）； 第五个参数是（是从Excel的第几列开始插入图片，从0开始计数）；* 第六个参数是（是从excel的第几行开始插入图片，从0开始计数）； 第七个参数是（图片宽度，共多少列）；* 第8个参数是（图片高度，共多少行）；*/ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, xIndexInteger,yIndexInteger, xIndexInteger + waterRemarkWidth, yIndexInteger + waterRemarkHeight);Picture pic = drawing.createPicture(anchor,wb.addPicture(byteArrayOut.toByteArray(), Workbook.PICTURE_TYPE_PNG));pic.resize();}}}public static void setExcelWaterMark(String inputSrc, String outputSrc, String waterMarkName){try {//读取excel文件Workbook wb =null;if (inputSrc.endsWith("xls")) {wb = new HSSFWorkbook(new FileInputStream(inputSrc));}else if (inputSrc.endsWith("xlsx")){wb = new XSSFWorkbook(new FileInputStream(inputSrc));}//获取excel sheet个数int sheets = wb.getNumberOfSheets();//循环sheet给每个sheet添加水印for (int i = 0; i < sheets; i++) {Sheet sheet = wb.getSheetAt(i);//获取excel实际所占行int row = sheet.getFirstRowNum() + sheet.getLastRowNum();//获取excel实际所占列Row row1 = sheet.getRow(sheet.getFirstRowNum());if (row1==null){continue;}int cell = sheet.getRow(sheet.getFirstRowNum()).getLastCellNum() + 1;//根据行与列计算实际所需多少水印putWaterRemarkToExcel(wb, sheet, waterMarkName, 0, 0, 6, 8, cell / 6 + 1, row / 8 + 1, 0, 0);//设置为受保护sheet.protectSheet(waterMarkName);}ByteArrayOutputStream os = new ByteArrayOutputStream();try {wb.write(os);} catch (IOException e) {e.printStackTrace();}wb.close();byte[] content = os.toByteArray();// Excel文件生成后存储的位置。File file1 = new File(outputSrc);OutputStream fos = null;try {fos = new FileOutputStream(file1);fos.write(content);os.close();fos.close();} catch (Exception e) {e.printStackTrace();}} catch (Exception e) {System.out.println(e.getMessage());}}public static BufferedImage createWaterMarkImage(String waterMark) {String[] textArray = waterMark.split("\n");Font font = new Font("microsoft-yahei", Font.PLAIN, 20);Integer width = 500;Integer height = 200;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();g.setColor(new Color(Integer.parseInt("#C5CBCF".substring(1), 16)));// 设定画笔颜色g.setFont(font);// 设置画笔字体g.shear(0.1, -0.26);// 设定倾斜度// 设置字体平滑g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);int y = 150;for (int i = 0; i < textArray.length; i++) {g.drawString(textArray[i], 0, y);// 画出字符串y = y + font.getSize();}g.dispose();// 释放画笔return image;}}

图片水印 jpg png 格式

package com.liukuquanshu.thirdparty.util;import lombok.extern.slf4j.Slf4j;import javax.imageio.ImageIO;import javax.swing.*;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;/*** Description: 图片水印工具类* @author tengk* @version 1.0*/@Slf4jpublic class ImgWaterMarkUtil {// 水印透明度private static float alpha = 0.7f;// 水印横向位置private static int positionWidth = 150;// 水印纵向位置private static int positionHeight = 300;// 水印文字字体private static Font font = new Font("宋体", Font.BOLD, 20);// 水印文字颜色private static Color color = Color.white;//文字水印位置铺满全屏private static ArrayList position1;private static ArrayList position2;/**** @param alpha* 水印透明度* @param positionWidth* 水印横向位置* @param positionHeight* 水印纵向位置* @param font* 水印文字字体* @param color* 水印文字颜色*/public static void setImageMarkOptions(float alpha, int positionWidth,int positionHeight, Font font, Color color) {if (alpha != 0.0f) {ImgWaterMarkUtil.alpha = alpha;}if (positionWidth != 0) {ImgWaterMarkUtil.positionWidth = positionWidth;}if (positionHeight != 0) {ImgWaterMarkUtil.positionHeight = positionHeight;}if (font != null) {ImgWaterMarkUtil.font = font;}if (color != null) {ImgWaterMarkUtil.color = color;}}/*** 给图片添加水印图片** @param iconPath* 水印图片路径* @param srcImgPath* 源图片路径* @param targerPath* 目标图片路径*/public static void markImageByIcon(String iconPath, String srcImgPath,String targerPath) {markImageByIcon(iconPath, srcImgPath, targerPath, null);}/*** 给图片添加水印图片、可设置水印图片旋转角度** @param iconPath* 水印图片路径* @param srcImgPath* 源图片路径* @param targerPath* 目标图片路径* @param degree* 水印图片旋转角度*/public static void markImageByIcon(String iconPath, String srcImgPath,String targerPath, Integer degree) {OutputStream os = null;try {Image srcImg = ImageIO.read(new File(srcImgPath));BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);// 1、得到画笔对象Graphics2D g = buffImg.createGraphics();// 2、设置对线段的锯齿状边缘处理g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null),srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,null);// 3、设置水印旋转if (null != degree) {g.rotate(Math.toRadians(degree),(double) buffImg.getWidth() / 2,(double) buffImg.getHeight() / 2);}// 4、水印图片的路径 水印图片一般为gif或者png的，这样可设置透明度ImageIcon imgIcon = new ImageIcon(iconPath);// 5、得到Image对象。Image img = imgIcon.getImage();g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));// 6、水印图片的位置g.drawImage(img, positionWidth, positionHeight, null);g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));// 7、释放资源g.dispose();// 8、生成图片os = new FileOutputStream(targerPath);ImageIO.write(buffImg, "JPG", os);System.out.println("图片完成添加水印图片");} catch (Exception e) {e.printStackTrace();} finally {try {if(null != os) {os.close();}} catch (Exception e) {e.printStackTrace();}}}/*** 给图片添加水印文字** @param logoText* 水印文字* @param srcImgPath* 源图片路径* @param targerPath* 目标图片路径*/public static void markImageByText(String logoText, String srcImgPath,String targerPath,int allFlag) {markImageByText(logoText, srcImgPath, targerPath, null,allFlag);}/*** 给图片添加水印文字、可设置水印文字的旋转角度** @param logoText* @param srcImgPath* @param targerPath* @param degree*/public static void markImageByText(String logoText, String srcImgPath,String targerPath, Integer degree,int allFlag) {InputStream is = null;OutputStream os = null;try {// 1、源图片Image srcImg = ImageIO.read(new File(srcImgPath));BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);// 2、得到画笔对象Graphics2D g = buffImg.createGraphics();// 3、设置对线段的锯齿状边缘处理g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null),srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,null);// 4、设置水印旋转if (null != degree) {g.rotate(Math.toRadians(degree),(double) buffImg.getWidth() / 2,(double) buffImg.getHeight() / 2);}// 5、设置水印文字颜色g.setColor(color);// 6、设置水印文字Fontg.setFont(font);// 7、设置水印文字透明度g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));// 8、第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y)if (allFlag == 1){int width = srcImg.getWidth(null);int height = srcImg.getHeight(null);position1 = new ArrayList();position2 = new ArrayList();position1.add(0);position1.add(width/4);position1.add(width/2);position1.add(width*3/4);position1.add(width);position2.add(0);position2.add(height/4);position2.add(height/2);position2.add(height*3/4);position2.add(height);for (int i = 0; i < position1.size(); i++) {for (int j = 0; j < position2.size(); j++) {g.drawString(logoText,(Integer) position1.get(i),(Integer) position2.get(j));}}}else {g.drawString(logoText,positionWidth,positionHeight);}// 9、释放资源g.dispose();// 10、生成图片os = new FileOutputStream(targerPath);ImageIO.write(buffImg, "JPG", os);System.out.println("图片完成添加水印文字");} catch (Exception e) {log.error("图片加水印失败",e);throw new RuntimeException("图片加水印失败");} finally {try {if (null == is) {} else {is.close();}} catch (Exception e) {e.printStackTrace();}try {if (null != os) {os.close();}} catch (Exception e) {e.printStackTrace();}}}public static void main(String[] args) {String markText = "cq-tengk "+new SimpleDateFormat("yyyy-MM-dd").format(new Date());//图片测试/*String srcImgPath = "D:/tmp/tmp/31.jpg";String targerTextPath2 = "D:/tmp/res/3000.jpg";String targerTextPath = "D:/tmp/tmp/3000.jpg";// 给图片添加水印文字markImageByText(markText, srcImgPath, targerTextPath,0);// 给图片添加水印文字,水印文字旋转-45markImageByText(markText, srcImgPath, targerTextPath2, -45,1);*///文件测试// String oldFile = "D:/tmp/tmp/20A00053公开招标（定稿）.doc";// String newFile = "D:/tmp/res/20A00053公开招标（定稿）.doc";// String oldFile = "D:/tmp/tmp/5G专网产品资费设计.docx";// String newFile = "D:/tmp/res/5G专网产品资费设计.docx";// String oldFile = "D:/tmp/tmp/2.xlsx";// String newFile = "D:/tmp/res/22.xlsx";String oldFile = "D:/tmp/tmp/2.pdf";String newFile = "D:/tmp/res/22.pdf";// String oldFile = "D:/tmp/tmp/2.pptx";// String newFile = "D:/tmp/res/2.pptx";OfficeWaterMarkUtil.addWaterMarkOffice(oldFile,newFile,markText);}}

PPTX格式

package com.liukuquanshu.thirdparty.util;import lombok.extern.slf4j.Slf4j;import org.apache.poi.sl.usermodel.PictureData;import org.apache.poi.sl.usermodel.PictureData.PictureType;import org.apache.poi.xslf.usermodel.XMLSlideShow;import org.apache.poi.xslf.usermodel.XSLFPictureShape;import org.apache.poi.xslf.usermodel.XSLFSlide;import javax.imageio.ImageIO;import java.awt.*;import java.awt.font.FontRenderContext;import java.awt.geom.Rectangle2D;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;/*** @author tkai* @description: TODO* @date /9/28 17:12*/@Slf4jpublic class PPTWaterMarkUtil {public static void main(String[] args) {String markText = "cq-tengk "+new SimpleDateFormat("yyyy-MM-dd").format(new Date());String oldFile = "D:/tmp/tmp/托尔斯泰.ppt";String newFile = "D:/tmp/res/托尔斯泰.ppt";setPPTWaterMark(oldFile,newFile,markText);}/*** PPT设置水印** @param path* @param targetpath* @param markStr* @throws IOException*/public static void setPPTWaterMark(String path, String targetpath, String markStr) {XMLSlideShow slideShow = null;try {slideShow = new XMLSlideShow(new FileInputStream(path));} catch (IOException e) {log.error("setPPTWaterMark fail:", e);throw new RuntimeException("setPPTWaterMark fail:获取PPT文件失败");}ByteArrayOutputStream os = null;FileOutputStream out = null;try {//获取水印os = getImage(markStr);PictureData pictureData1 = slideShow.addPicture(os.toByteArray(), PictureType.PNG);for (XSLFSlide slide : slideShow.getSlides()) {XSLFPictureShape pictureShape = slide.createPicture(pictureData1);//pictureShape.setAnchor(new java.awt.Rectangle(250, 0, 500, 500));pictureShape.setAnchor(pictureShape.getAnchor());}out = new FileOutputStream(targetpath);slideShow.write(out);} catch (IOException e) {log.error("setPPTWaterMark fail:" + e);throw new RuntimeException("setPPTWaterMark fail：生成ppt文件失败");} finally {if (slideShow != null) {try {slideShow.close();} catch (IOException e) {e.printStackTrace();}}if (out != null) {try {out.close();} catch (IOException e) {e.printStackTrace();}}if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 获取水印文字图片流** @param text* @return*/private static ByteArrayOutputStream getImage(String text) {ByteArrayOutputStream os = new ByteArrayOutputStream();try {// 导出到字节流BBufferedImage image = createWaterMarkImageBig(text);ImageIO.write(image, "png", os);} catch (IOException e) {// log.error("getImage fail: 创建水印图片IO异常", e);// throw new MyException(ResultCode.FAILURE, "getImage fail: 创建水印图片IO异常");}return os;}/*** 根据文字生成水印图片（大号 平铺）** @param text* @return*/public static BufferedImage createWaterMarkImageBig(String text) {Integer width = 1000;Integer height = 800;BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// 获取bufferedImage对象Font font = new Font("宋体", Font.PLAIN, 70);Graphics2D g2d = image.createGraphics();image = g2d.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);g2d.dispose();g2d = image.createGraphics();//设置字体颜色和透明度g2d.setColor(new Color(0, 0, 0, 60));//设置字体g2d.setStroke(new BasicStroke(1));//设置字体类型 加粗 大小g2d.setFont(font);//设置倾斜度g2d.rotate(Math.toRadians(-30), (double) image.getWidth() / 2, (double) image.getHeight() / 2);FontRenderContext context = g2d.getFontRenderContext();Rectangle2D bounds = font.getStringBounds(text, context);double x = (width - bounds.getWidth()) / 2;double y = (height - bounds.getHeight()) / 2;double ascent = -bounds.getY();double baseY = y + ascent;//写入水印文字原定高度过小，所以累计写水印，增加高度g2d.drawString(text, (int) x, (int) baseY);//设置透明度g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));//释放对象g2d.dispose();return image;}}

因为spire free这一套使用有限制，比如ppt只能对十页以内加水印，十页以后的内容会被删去，所以使用了一些别的方法，参考出处因为反复改动记录不详，感谢前面的探索者，这里就不一一列出了。