Pdf添加文字水印

 

 

package com.zving.demo;

import java.awt.Color;  
import java.io.BufferedOutputStream;  
import java.io.File;  
import java.io.FileOutputStream;  
import com.lowagie.text.Element;   
import com.lowagie.text.pdf.BaseFont;  
import com.lowagie.text.pdf.PdfContentByte;  
import com.lowagie.text.pdf.PdfGState; 
import com.lowagie.text.Rectangle; 
import com.lowagie.text.pdf.PdfReader;  
import com.lowagie.text.pdf.PdfStamper; 
public class PdfWaterPrint {

    public static void main(String[] args) {
        try {
            // 目标pdf文件  
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("E:/BBB.pdf"))); 
            // 源pdf文件
            setWatermark(bos, "E:/AAA.pdf",16);  
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void setWatermark(BufferedOutputStream bos, String input, int permission){  
        try {
            PdfReader reader = new PdfReader(input);  
            PdfStamper stamper = new PdfStamper(reader, bos);  
            int total = reader.getNumberOfPages() + 1;  
            PdfContentByte content;  
            BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",BaseFont.EMBEDDED);  
            PdfGState gs = new PdfGState();  
            Rectangle pageRect = null;for (int i = 1; i < total; i++) {  
                // 设置透明度
              gs.setFillOpacity(0.6f); 
              gs.setStrokeOpacity(0.6f); 
              pageRect = stamper.getReader().getPageSizeWithRotation(i); 
              // 计算水印X,Y坐标 
              float x = pageRect.getWidth() / 2; 
              float y = pageRect.getHeight() / 2; 
              //获得PDF最顶层 
              content = stamper.getOverContent(i); 
              content.saveState(); 
              content.setGState(gs); 
              content.beginText(); 
              content.setColorFill(new java.awt.Color(130, 130, 130));  
              content.setFontAndSize(base, pageRect.getWidth() / 10); 
              // 水印文字成45度角倾斜 
              content.showTextAligned(Element.ALIGN_CENTER , "新闻记者证核发办公室", x, y, 45); 
              content.endText();  
            }  
            stamper.close();
        } catch (Exception e) {
            e.printStackTrace();
        }  
    } 
     

}

 

所需要得jar包