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Java 实现PDF添加水印

news 2025/6/24 15:34:06

maven依赖：

   <dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.4.3</version> </dependency>

网络地址添加水印代码：

    public static boolean waterMarkNet(String inputFile, String outputFile, String waterMarkName) {try{URL url = new URL(inputFile);PdfReader reader = new PdfReader(url);PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));//这里的字体设置比较关键，这个设置是支持中文的写法BaseFont base = BaseFont.createFont();//BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",   BaseFont.EMBEDDED);// 使用系统字体int total = reader.getNumberOfPages() + 1;PdfContentByte under;Rectangle pageRect = null;PdfGState gs = new PdfGState();//透明度gs.setFillOpacity(0.2f);gs.setStrokeOpacity(0.1f);for (int i = 1; i < total; i++){pageRect = stamper.getReader().getPageSizeWithRotation(i);under = stamper.getOverContent(i);under.saveState();under.setGState(gs);under.beginText();under.setFontAndSize(base, 50);under.setTextMatrix(30, 30);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 100, 20);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 300, 20);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 500, 20);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 700, 20);// 添加水印文字under.endText();under.setLineWidth(10f);under.stroke();}stamper.close();return true;} catch (Exception e){e.printStackTrace();return false;

本地地址添加水印代码

/*** 功能描述: 本地文件添加水印** @param inputFile* @param outputFile* @param waterMarkName* @date 10:52 2024/11/20*/public static boolean waterMark(String inputFile, String outputFile, String waterMarkName) {try{PdfReader reader = new PdfReader(inputFile);PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));//这里的字体设置比较关键，这个设置是支持中文的写法BaseFont base = BaseFont.createFont();//BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",   BaseFont.EMBEDDED);// 使用系统字体int total = reader.getNumberOfPages() + 1;PdfContentByte under;Rectangle pageRect = null;PdfGState gs = new PdfGState();//透明度gs.setFillOpacity(0.2f);gs.setStrokeOpacity(0.1f);for (int i = 1; i < total; i++){pageRect = stamper.getReader().getPageSizeWithRotation(i);under = stamper.getOverContent(i);under.saveState();under.setGState(gs);under.beginText();under.setFontAndSize(base, 50);under.setTextMatrix(30, 30);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 100, 20);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 300, 20);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 500, 20);under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, 300, 700, 20);// 添加水印文字under.endText();under.setLineWidth(10f);under.stroke();}stamper.close();return true;} catch (Exception e){e.printStackTrace();return false;}}

测试代码

  public static void main(String[] args) {System.out.println(TestwaterMark.waterMark("https://XXXXXX/%E6%AD%A3%E6%96%87.pdf", "D:\\XXX\\XXX.pdf", "zymz"+DateUtils.dateTimeNow()));}