java_pdf加水印.txt

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import org.apache.commons.io.IOUtils;
import org.jbarcode.JBarcode;
import org.jbarcode.encode.Code39Encoder;
import org.jbarcode.encode.InvalidAtributeException;
import org.jbarcode.paint.BaseLineTextPainter;
import org.jbarcode.paint.WideRatioCodedPainter;import com.lowagie.text.BadElementException;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
 
/**
* pdf工具
*/
public class PdfUtils {
    /**
     * 添加条码
     * @param str  条码内容
     * @param filepath  pdf 文件绝对路径