java 为pdf添加水印图片

首先需要引入两个Jar包分别是：iTextAsian.jar 、itext-2.1.7.jar  可以去  http://download.csdn.net/detail/work201003/9227159  下载；

代码：

import java.awt.Color;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.Image;
import com.lowagie.text.PageSize;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;public class TestWaterPrint {
public static void main(String[] args) throws DocumentException,
IOException {
// 要输出的pdf文件
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("E:/abc.pdf")));
Calendar cal = Calendar.getInstance();
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
// 将pdf文件先加水印然后输出
setWatermark(bos, "D:/itext.pdf", format.format(cal.getTime())
+ "  下载使用人：" + "测试user", 16);
}public static void setWatermark(BufferedOutputStream bos, String input,
String waterMarkName, int permission) throws DocumentException,
IOException {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();
for (int i = 1; i < total; i++) {
content = stamper.getOverContent(i);// 在内容上方加水印
    //content = stamper.getUnderContent(i);//在内容下方加水印
gs.setFillOpacity(0.2f);
// content.setGState(gs);
content.beginText();
content.setColorFill(Color.LIGHT_GRAY);
content.setFontAndSize(base, 50);
content.setTextMatrix(70, 200);
content.showTextAligned(Element.ALIGN_CENTER, "公司内部文件，请注意保密！", 300,350, 55);
Image image = Image.getInstance("D:/itext2.png");
/*img.setAlignment(Image.LEFT | Image.TEXTWRAP);
img.setBorder(Image.BOX);
img.setBorderWidth(10);
img.setBorderColor(BaseColor.WHITE);
img.scaleToFit(1000, 72);//大小
img.setRotationDegrees(-30);//旋转 */
image.setAbsolutePosition(200, 206); // set the first background image of the absolute
image.scaleToFit(200,200);
content.addImage(image);
content.setColorFill(Color.BLACK);
content.setFontAndSize(base, 8);
content.showTextAligned(Element.ALIGN_CENTER, "下载时间："
+ waterMarkName + "", 300, 10, 0);
content.endText();}
stamper.close();
}
}

原文档图

效果图：

更多详细代码请查看：http://www.open-open.com/lib/view/open1339726488115.html