package test;import java.io.FileOutputStream;import com.itextpdf.text.BaseColor;import com.itextpdf.text.Element;import com.itextpdf.text.Rectangle;import com.itextpdf.text.pdf.BaseFont;import com.itextpdf.text.pdf.PdfContentByte;import com.itextpdf.text.pdf.PdfGState;import com.itextpdf.text.pdf.PdfReader;import com.itextpdf.text.pdf.PdfStamper;public class pdfUtils { /** * @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(0.8f); under.setGState(gs); under.restoreState(); under.beginText(); under.setFontAndSize(base, 25); under.setTextMatrix(30, 30); under.setColorFill(BaseColor.RED); for (int y = 0; y < 10; y++) {for (int x = 0; x < 8; x++) {// 水印文字成45度角倾斜 under.showTextAligned(Element.ALIGN_LEFT , waterMarkName, 100 + 300 * x, 300 * y, 45);}} // 添加水印文字 under.endText(); under.setLineWidth(1f); under.stroke(); } stamper.close(); return true; } catch (Exception e) { e.printStackTrace(); return false; } } public static void main(String[] args) { System.out.println(pdfUtils.waterMark("D:\222\表单&正文.pdf", "D:\222\正文.pdf", "中文水印")); } }