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0.5gs.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）
