使用java代码实现给PDF加水印的功能
首先导入所需要的依赖
<dependency> <groupId>com.itextpdf</groupId> <artifactId>itextpdf</artifactId> <version>5.5.11</version> </dependency> <dependency> <groupId>com.itextpdf</groupId> <artifactId>itext-asian</artifactId> <version>5.2.0</version> </dependency>
java 代码实现
/** * @param inputFile 你的PDF文件地址 * @param outputFile 添加水印后生成PDF存放的地址 * @param waterMarkName 你的水印 * @return */ 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("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体 int total = reader.getNumberOfPages() + 1; PdfContentByte under; Rectangle pageRect = null; for (int i = 1; i < total; i++) { pageRect = stamper.getReader(). getPageSizeWithRotation(i); // 计算水印X,Y坐标 float x = pageRect.getWidth()/10; float y = pageRect.getHeight()/10-10; // 获得PDF最顶层 under = stamper.getOverContent(i); under.saveState(); // set Transparency PdfGState gs = new PdfGState(); // 设置透明度为0.2 gs.setFillOpacity(1.f); under.setGState(gs); under.restoreState(); under.beginText(); under.setFontAndSize(base, 60); under.setColorFill(BaseColor.ORANGE); // 水印文字成45度角倾斜 under.showTextAligned(Element.ALIGN_CENTER , waterMarkName, x, y, 55); // 添加水印文字 under.endText(); under.setLineWidth(1f); under.stroke(); } stamper.close(); return true; } catch (Exception e) { e.printStackTrace(); return false; } }