奥展项目笔记13-给生成的pdf加盖印章
作者：互联网
1.添加maven依赖
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.6</version>
</dependency>
2.获得透明的png格式的电子印章图片的工具类
package lucky.aozhan.user.utils;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
public class PNGchange {
public static void main(String[] args) {
System.out.println(transferAlpha2File("D:\\resource\\yinzhang\\aozhanyzimg.png", "D:\\resource\\yinzhang\\aozhanyzimg_1.png"));
}
public static boolean transferAlpha2File(String imgSrc, String imgTarget) {
File file = new File(imgSrc);
InputStream is = null;
boolean result = false;
try {
is = new FileInputStream(file);
// 如果是MultipartFile类型，那么自身也有转换成流的方法：is = file.getInputStream();
BufferedImage bi = ImageIO.read(is);
Image image = (Image) bi;
ImageIcon imageIcon = new ImageIcon(image);
BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
int alpha = 0;
for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
int rgb = bufferedImage.getRGB(j2, j1);
int R = (rgb & 0xff0000) >> 16;
int G = (rgb & 0xff00) >> 8;
int B = (rgb & 0xff);
if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
}
bufferedImage.setRGB(j2, j1, rgb);
}
}
g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
result = ImageIO.write(bufferedImage, "png", new File(imgTarget));// 直接输出文件
} catch (Exception e) {
e.printStackTrace();
result = false;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
return result;
}
public static byte[] transferAlpha2Byte(String imgSrc) {
ByteArrayOutputStream byteArrayOutputStream = null;
File file = new File(imgSrc);
InputStream is = null;
byte[] result = null;
try {
is = new FileInputStream(file);
// 如果是MultipartFile类型，那么自身也有转换成流的方法：is = file.getInputStream();
BufferedImage bi = ImageIO.read(is);
Image image = (Image) bi;
ImageIcon imageIcon = new ImageIcon(image);
BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
int alpha = 0;
for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
int rgb = bufferedImage.getRGB(j2, j1);
int R = (rgb & 0xff0000) >> 16;
int G = (rgb & 0xff00) >> 8;
int B = (rgb & 0xff);
if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
}
bufferedImage.setRGB(j2, j1, rgb);
}
}
g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
byteArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "png", byteArrayOutputStream);//转换成byte数组
result = byteArrayOutputStream.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
if (byteArrayOutputStream != null) {
try {
byteArrayOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
return result;
}
}
3.添加印章的工具类
package lucky.aozhan.user.utils;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.parser.ImageRenderInfo;
import com.itextpdf.text.pdf.parser.PdfReaderContentParser;
import com.itextpdf.text.pdf.parser.RenderListener;
import com.itextpdf.text.pdf.parser.TextRenderInfo;
import java.awt.geom.Rectangle2D;
import java.io.FileOutputStream;
import java.io.IOException;
public class AddYingZhangImgUtil {
public static void main(String[] args) throws IOException, DocumentException {
// 模板文件路径
String templatePath = "D:\\resource\\yinzhang\\p869.pdf";
// 生成的文件路径
String targetPath = "D:\\resource\\yinzhang\\p869_new.pdf";
// 图片路径, 需要png透明图片,否则会覆盖文字
String imagePath = "D:\\resource\\yinzhang\\aozhanyzimg_1.png";
addSignImg(templatePath, targetPath, imagePath, "INSPECTION", null);
}
/**
* 根据pdf中的关键字，获取文字的绝对位置，并进行签章
*
* @param inputPath 未处理pdf
* @param targetPath 已签章pdf地址
* @param imagePath 签章图片地址
* @param inputPath pdf中的关键字
* @param pageNum pdf页数,可传null，默认设置最大页数
* @return float的x与y值
* @throws IOException
*/
private static void addSignImg(String inputPath, String targetPath, final String imagePath, final String keyWord, Integer pageNum) throws IOException, DocumentException {
PdfReader pdfReader = new PdfReader(inputPath);
// 读图片
final Image image = Image.getInstance(imagePath);
// 根据域的大小缩放图片
image.scaleToFit(100, 100);
image.setRotationDegrees(15);//设置印章图片的旋转角度
if (null == pageNum) {
pageNum = pdfReader.getNumberOfPages();
}
new PdfReaderContentParser(pdfReader).processContent(pageNum, new RenderListener() {
public void beginTextBlock() {
}
public void renderText(TextRenderInfo textRenderInfo) {
String text = textRenderInfo.getText();
if (text != null && text.contains(keyWord)) {
// 文字在page中的横坐标、纵坐标
com.itextpdf.awt.geom.Rectangle2D.Float textFloat = textRenderInfo.getBaseline().getBoundingRectange();
float x = textFloat.x;
float y = textFloat.y;
// 设置图片位置
image.setAbsolutePosition(x + 50f, y - 30f);
}
}
public void endTextBlock() {
}
public void renderImage(ImageRenderInfo renderInfo) {
}
});
// 获取操作的页面
PdfStamper stamper = new PdfStamper(pdfReader, new FileOutputStream(targetPath));
PdfContentByte under = stamper.getOverContent(pageNum);
under.addImage(image);
stamper.close();
pdfReader.close();
}
}
4.效果图
参考文献：
https://blog.csdn.net/weixin_39515661/article/details/90402601?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task
标签：13,String,text,itextpdf,import,奥展,pdf,com 来源： https://www.cnblogs.com/luckyplj/p/12454360.html