java pdf添加水印文本及图片文本
PDF文件添加文本水印：
private static int interval = 30; public static void 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，这个设置支持中文的写法 BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED); //使用系统字体 Rectangle pageRect = null; PdfGState gs = new PdfGState(); //设置透明度 gs.setFillOpacity(0.3f); gs.setStrokeOpacity(0.3f); int total = reader.getNumberOfPages() + 1; JLabel label = new JLabel(); FontMetrics metrics; int textH = 0; int textW = 0; label.setText(waterMarkName); metrics = label.getFontMetrics(label.getFont()); textH = metrics.getHeight(); textW = metrics.stringWidth(label.getText()); PdfContentByte under; for (int i = 1; i < total; i++) { pageRect = reader.getPageSizeWithRotation(i); under = stamper.getOverContent(i); under.saveState(); under.setGState(gs); under.beginText(); under.setFontAndSize(base, 30); //控制字体间宽度 // 水印文字成30度角倾斜 for (int height = interval + textH; height < pageRect.getHeight(); height = height + textH*8) { for (int width = interval + textW; width < pageRect.getWidth() + textW; width = width + textW*4) { under.showTextAligned(Element.ALIGN_LEFT , waterMarkName, width - textW, height - textH, 30); } } // 添加水印文字 under.endText(); } //关闭流 stamper.close(); reader.close(); } catch (Exception e) { e.printStackTrace(); } }
PDF添加图片水印:
private static final float IAMGE_HEIGHT = 110f; // 水印图片的的高度 private static final float IAMGE_WIDTH = 110f; // 水印图片的的宽度 public static void addPdfMark(String pdfPath,String logoPath, String outPath) throws Exception { PdfReader reader = new PdfReader(pdfPath, "PDF".getBytes()); // 如果是web项目，直接下载应该放到response的流里面 // PdfStamper stamp = new PdfStamper(reader,response.getOutputStream()); // 添加水印之后的pdf文件 PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(outPath)); int pageSize = reader.getNumberOfPages(); float pageHeight = reader.getPageSize(1).getHeight(); float pageWidth = reader.getPageSize(1).getWidth(); try { // 每两行显示两个 左边一个，右边一个 int lineNum = (int) (pageHeight / IAMGE_HEIGHT); // 行数 int middleY = (int) pageWidth / 2; for (int i = 1; i <= pageSize; i++) { for (int j = 0, k = 0; j < lineNum; j = j + 4, k++) { Random random = new Random(); // 放入水印 Image img = Image.getInstance(logoPath); img.scaleAbsolute(IAMGE_WIDTH, IAMGE_HEIGHT * 184 / 455); // 将水印显示到最底层 img.setAlignment(Image.UNDERLYING); int trueY; while (true) { trueY = random.nextInt(middleY); if (trueY > IAMGE_WIDTH / 2 && trueY < (middleY - IAMGE_WIDTH)) { break; } } // 水印的位置 img.setAbsolutePosition(trueY, j * IAMGE_HEIGHT + (float) random.nextInt((int) IAMGE_HEIGHT) - (k % 2) * 10); // 旋转 角度 img.setRotationDegrees(random.nextInt(360)); PdfContentByte under = stamp.getUnderContent(i); PdfGState gs = new PdfGState(); // 设置透明度为0.5 gs.setFillOpacity(0.5f); under.setGState(gs); under.addImage(img); while (true) { trueY = random.nextInt(middleY) + middleY; if (trueY > middleY + IAMGE_WIDTH / 2 && trueY < (2 * middleY - IAMGE_WIDTH)) { break; } } // 水印的位置 img.setAbsolutePosition(trueY, j * IAMGE_HEIGHT + (float) random.nextInt((int) IAMGE_HEIGHT) - (k % 2) * 10); // 旋转角度 img.setRotationDegrees(random.nextInt(360)); under.addImage(img); } } } catch (Exception e) { throw e; } finally { stamp.close(); reader.close(); }
测试--------------------------------------------------------------------------------
public static void main(String[] args) throws Exception { waterMark("xxx.pdf", "yyy.pdf", "测试工程"); //addPdfMark("xxx.pdf","image.png","yyy.xml"); System.out.println("结束"); } }
参考了很多前辈的，希望能帮到各位！
模块所需jar包（itextpdf-5.5.13.1.jar）