目录

PDFBox和Itext是操作PDF文档最常用的两种java library。

这里记录一下用两种内库给pdf添加水印的方法。

Itext

import com.itextpdf.text.Document;

import com.itextpdf.text.DocumentException;

import com.itextpdf.text.Image;

import com.itextpdf.text.Paragraph;

import com.itextpdf.text.pdf.PdfContentByte;

import com.itextpdf.text.pdf.PdfReader;

import com.itextpdf.text.pdf.PdfStamper;

import com.itextpdf.text.pdf.PdfWriter;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

/**

* Title：ItextPdfUtil

*

* @author Flicker

**/

public class ItextPdfUtil {

//创建一个pdf文件

public static void createPdf(){

Document document = new Document();

try {

PdfWriter.getInstance(document,new FileOutputStream("d:\\createPdf.pdf"));

} catch (DocumentException e) {

e.printStackTrace();

} catch (FileNotFoundException e) {

e.printStackTrace();

}

document.open();

try {

//设置文档文字

document.add(new Paragraph("Hello world"));

} catch (DocumentException e) {

e.printStackTrace();

}

document.close();

}

//给pdf添加水印

public static void setImage(){

try {

PdfReader reader = new PdfReader("d:\\createPdf.pdf");

PdfStamper stamper = new PdfStamper(reader,new FileOutputStream("d:\\setWatermarkPdf.pdf"));

Image image = Image.getInstance("d:\\test\\BarCode.png");

image.setAbsolutePosition(260,790);

PdfContentByte under = stamper.getUnderContent(1);

under.addImage(image);

stamper.close();

reader.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

//createPdf();

setImage();

}

}

PdfBox

package com.zo.util;

import org.apache.pdfbox.pdmodel.PDDocument;

import org.apache.pdfbox.rendering.PDFRenderer;

import javax.imageio.ImageIO;

import javax.swing.*;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

/**

* Title：PdfBoxUtil

*

* @author Flicker

**/

public class PdfBoxUtil {

private static final int LogoPart = 4;

//pdf转成image

public static void toImage(){

File file = new File("d:\\1.pdf");

try {

PDDocument doc = PDDocument.load(file);

PDFRenderer renderer = new PDFRenderer(doc);

int pageCount = doc.getNumberOfPages();

for (int i = 0; i < pageCount; i++) {

// 方式1,第二个参数是设置缩放比(即像素)

//BufferedImage image = renderer.renderImageWithDPI(i, 296);

// 方式2,第二个参数是设置缩放比(即像素)

BufferedImage image = renderer.renderImage(i, 2.5f);

ImageIO.write(image, "PNG", new File("d:\\1.png"));

}

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 给图片添加水印、可设置水印图片旋转角度

*

* @param iconPath 水印图片路径

* @param srcImgPath 源图片路径

* @param targerPath 目标图片路径

* @param degree 水印图片旋转角度

* @param width 宽度(与左相比)

* @param height 高度(与顶相比)

* @param clarity 透明度(小于1的数)越接近0越透明

*/

public static void waterMarkImageByIcon(String iconPath, String srcImgPath,

String targerPath, Integer degree, Integer width, Integer height,

float clarity) {

OutputStream os = null;

try {

Image srcImg = ImageIO.read(new File(srcImgPath));

System.out.println("width:" + srcImg.getWidth(null));

System.out.println("height:" + srcImg.getHeight(null));

BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),

srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);

// 得到画笔对象

// Graphics g= buffImg.getGraphics();

Graphics2D g = buffImg.createGraphics();

// 设置对线段的锯齿状边缘处理

g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,

RenderingHints.VALUE_INTERPOLATION_BILINEAR);

g.drawImage(

srcImg.getScaledInstance(srcImg.getWidth(null),

srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,

null);

if (null != degree) {

// 设置水印旋转

g.rotate(Math.toRadians(degree),

(double) buffImg.getWidth() / 2,

(double) buffImg.getHeight() / 2);

}

// 水印图象的路径 水印一般为gif或者png的，这样可设置透明度

ImageIcon imgIcon = new ImageIcon(iconPath);

// 得到Image对象。

Image img = imgIcon.getImage();

float alpha = clarity; // 透明度

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,

alpha));

// 表示水印图片的位置

g.drawImage(img, width, height, null);

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));

g.dispose();

os = new FileOutputStream(targerPath);

// 生成图片

ImageIO.write(buffImg, "JPG", os);

System.out.println("添加水印图片完成!");

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (null != os) {

os.close();

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

public static void main(String[] args) {

//toImage();

waterMarkImageByIcon("d:\\test\\BarCode.png","d:\\1.png","d:\\2.png"

,0,1000,10,1f);

}

}