java pdf加水印的方法
本文实例为大家分享了java pdf加水印的具体代码,供大家参考,具体内容如下
引入依赖
<dependency> <groupId>com.itextpdf.tool</groupId> <artifactId>xmlworker</artifactId> <version>5.5.10</version> </dependency> <dependency> <groupId>com.itextpdf</groupId> <artifactId>itextpdf</artifactId> <version>5.5.10</version> </dependency>
‘/static/fonts/SIMYOU.TTF' 字体 本机没有的话, 可以百度下载
/** * pdf 加水印 * * @return */ public byte[] pdfAddWaterMark(byte[] byes) { String fileName = UUID.randomUUID().toString() + ".pdf"; String courseFile = ""; try { // 第二种:获取项目路径 D:\git\daotie\daotie //生成临时文件 , 读取完删除 File directory = new File("");// 参数为空 courseFile = directory.getCanonicalPath() + "/"; } catch (IOException e) { e.printStackTrace(); } byte[] returnBytes = null; // 待加水印的文件 PdfReader reader = null; PdfStamper stamper = null; // ByteArrayOutputStream baos = null; FileOutputStream os = null; try { reader = new PdfReader(byes); // 加完水印的文件 // baos = new ByteArrayOutputStream(); // stamper = new PdfStamper(reader, baos); // 加完水印的文件 os = new FileOutputStream(courseFile + fileName); stamper = new PdfStamper(reader, os); int total = reader.getNumberOfPages() + 1; PdfContentByte content; // BaseFont font = BaseFont.createFont(); BaseFont basefont = BaseFont.createFont("/static/fonts/SIMYOU.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); //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*/ /*//设置透明度 PdfGState gs = new PdfGState(); gs.setFillOpacity(1f); gs.setStrokeOpacity(1f);*/ PdfContentByte under; com.itextpdf.text.Rectangle pageRect = null; // 循环对每页插入水印 for (int i = 1; i < total; i++) { pageRect = stamper.getReader().getPageSizeWithRotation(i); // 计算水印X,Y坐标 float x = (float) (pageRect.getWidth() / 1.98); float y = (float) (pageRect.getHeight() / 2.8); // 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(basefont, pageRect.getHeight() / 17); under.setColorFill(BaseColor.RED); // 水印文字成45度角倾斜 System.out.println("width" + pageRect.getWidth()); System.out.println("height" + pageRect.getHeight()); System.out.println("x" + x); System.out.println("y" + y); under.showTextAligned(Element.ALIGN_CENTER, "图片仅供预览,不可用于商业用途", x, y, 45); // 添加水印文字 under.endText(); under.setLineWidth(1f); under.stroke(); } // returnBytes = baos.toByteArray(); } catch (IOException e) { e.printStackTrace(); } catch (DocumentException e) { e.printStackTrace(); } finally { try { stamper.close(); if (os != null) { os.close(); } if (reader != null) { reader.close(); } } catch (DocumentException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }
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