Following previous blog: PDF files are added two-dimensional code watermark tutorial , add a picture watermark tutorial two-dimensional code after the previous two-dimensional code to add a watermark to perfect function, before the program generates two-dimensional code image background is not transparent, so not very beautiful, so this blog for program improvement, two-dimensional code to set the background picture transparent, but so beautiful, but very situation obscured pdf text or picture may appear, this situation will lead to a two-dimensional code not scan
Reference online tutorials, packaging method calls
/**
* 设置图片背景透明
* @date 2019年6月27日下午8:46:42
* @param srcImage
* @param alpha
* @return
* @throws IOException
*/
public static BufferedImage transparentImage(BufferedImage srcImage,
int alpha) throws IOException {
int imgHeight = srcImage.getHeight();//取得图片的长和宽
int imgWidth = srcImage.getWidth();
int c = srcImage.getRGB(3, 3);
//防止越位
if (alpha < 0) {
alpha = 0;
} else if (alpha > 10) {
alpha = 10;
}
BufferedImage tmpImg = new BufferedImage(imgWidth, imgHeight,BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage
for(int i = 0; i < imgWidth; ++i)//把原图片的内容复制到新的图片，同时把背景设为透明
{
for(int j = 0; j < imgHeight; ++j){
//把背景设为透明
if(srcImage.getRGB(i, j) == c){
tmpImg .setRGB(i, j, c & 0x00ffffff);
}
//设置透明度
else{
int rgb = tmpImg .getRGB(i, j);
rgb = ((alpha * 255 / 10) << 24) | (rgb & 0x00ffffff);
tmpImg .setRGB(i, j, rgb);
}
}
}
return tmpImg ;
}
Then before the program improvements, mainly bufferImage adjustment,
// 设置透明背景
image = transparentImage(image,10);
/**
* 为PDF附件添加图片水印
* @author nicky.ma
* @date 2019/6/11 12:00:32
* @param bos 输出文件的位置
* @param input 输入文件流
* @param image 水印图片
*/
public static void setWatermarkForPDF(BufferedOutputStream bos, InputStream input, BufferedImage image)
throws IOException, DocumentException {
PdfReader reader = new PdfReader(input);
PdfStamper stamper = new PdfStamper(reader, bos);
//int total = reader.getNumberOfPages() + 1;
PdfContentByte waterMar;
PdfGState gs = new PdfGState();
long startTime = System.currentTimeMillis();
System.out.println("PDF加图片水印 start");
//for (int i = 1; i < total; i++) {
waterMar = stamper.getOverContent(1);// 在内容上方加水印
//waterMar = stamper.getUnderContent(1);//在内容下方加水印
// 设置图片透明度为0.2f
//gs.setFillOpacity(0.2f);
// 设置笔触字体不透明度为0.4f
//gs.setStrokeOpacity(0.4f);
// 开始水印处理
waterMar.beginText();
// 设置透明度
waterMar.setGState(gs);
// 设置水印字体参数及大小
//waterMar.setFontAndSize(BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED), 60);
// 设置水印对齐方式 水印内容 X坐标 Y坐标 旋转角度
//waterMar.showTextAligned(Element.ALIGN_CENTER, "公司内部文件，请注意保密！", 500, 430, 45);
// 设置水印颜色
//waterMar.setColorFill(BaseColor.GRAY);
// 设置透明背景
image = transparentImage(image,10);
// 创建水印图片
com.itextpdf.text.Image itextimage = getImage(image,100);
// 水印图片位置
itextimage.setAbsolutePosition(2100,1400);
// 边框固定
itextimage.scaleToFit(200, 200);
// 设置旋转弧度
//image.setRotation(30);// 旋转 弧度
// 设置旋转角度
//image.setRotationDegrees(45);// 旋转 角度
// 设置等比缩放
//itextimage.scalePercent(90);
// 自定义大小
itextimage.scaleAbsolute(200,200);
// 附件加上水印图片
waterMar.addImage(itextimage);
// 完成水印添加
waterMar.endText();
// stroke
waterMar.stroke();
//}
long endTime = System.currentTimeMillis();
System.out.println("PDF加图片水印 ok 所用时间:"+(endTime-startTime)+"s");
stamper.close();
reader.close();
}
Then also you need to modify:
There is no need to set the color, you can pass a null
itextImage=com.itextpdf.text.Image.getInstance(bufferedImage,null);
After modifying the code, the original program reference PDF file to add a watermark tutorial two-dimensional code
public static com.itextpdf.text.Image getImage(BufferedImage bufferedImage,float percent){
com.itextpdf.text.Image itextImage=null;
try {
itextImage=com.itextpdf.text.Image.getInstance(bufferedImage,null);
} catch (BadElementException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
itextImage.setWidthPercentage(0.1f);
itextImage.setSpacingAfter(0.1f);
itextImage.scalePercent(percent);
itextImage.setBorder(Rectangle.NO_BORDER);
return itextImage;
}
The above is for the repair pdf, and then modify the picture of the two-dimensional code
Here as long as you can call the package a good way
//设置二维码图片背景透明
bufferedImage = transparentImage(bufferedImage,10);Reference code, before the code for a specific implementation of the reference
/**
* 给图片添加水印、可设置水印图片旋转角度
* @author mazq
* @date 2019年6月12日下午2:11:11
* @param bufferedImage
* 水印图片
* @param in
* 获取附件上传stream
* @param os
* 附件保存stream
* @param degree
* 选择角度
* @param imgType
* 上传附件的类型
*/
public static void setWaterMarkForIMG(BufferedImage bufferedImage, InputStream in, OutputStream os, Integer degree,String imgType) {
//OutputStream os = null;
long startTime = System.currentTimeMillis();
System.out.println("图片附件添加图片水印 start");
try {
Image srcImg = ImageIO.read(in);
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);
}
//float alpha = 0.2f; // 透明度
//g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
// 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();
//设置二维码图片背景透明
bufferedImage = transparentImage(bufferedImage,10);
// 表示水印图片的位置
g.drawImage(bufferedImage, buffImg.getWidth()-180, 0, null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
g.dispose();
//os = new FileOutputStream(targerPath);
// 生成图片
ImageIO.write(buffImg, imgType, os);
long endTime = System.currentTimeMillis();
System.out.println("图片附件添加图片水印 ok 所用时间:"+(endTime-startTime)+"s");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != os)
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
ps: This blog is only a supplement to the previous two tutorials, please look before two blog, look at this blog
PDF files to add the two-dimensional code watermark tutorial , add a picture watermark tutorial two-dimensional code