通过pdfbox向pdf中添加图像，但在添加后pdf变成空白的。

huangapple
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英文:

Adding an image to a pdf via pdfbox but after adding the pdf get blank

问题

  1. import java.awt.image.BufferedImage;
  2. import java.io.ByteArrayInputStream;
  3. import java.io.File;
  4. import java.io.IOException;
  5. import java.util.Scanner;
  6. import javax.imageio.ImageIO;
  7. import org.apache.commons.codec.binary.Base64;
  8. import org.apache.pdfbox.pdmodel.PDDocument;
  9. import org.apache.pdfbox.pdmodel.PDPage;
  10. import org.apache.pdfbox.pdmodel.PDPageContentStream;
  11. import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
  13. public class One {
  14.     public static void main(String[] args) throws IOException {
  15.         Scanner s = new Scanner(System.in);
  16.         System.out.println("Enter base64 string to be converted to an image");
  17.         String base64 = s.nextLine();
  18.         byte[] base64Val = convertToImg(base64);
  19.         writeByteToImageFile(base64Val, "image.png");
  20.         System.out.println("Saved the base64 as an image in the current directory with the name image.png");
  21.         addImageToPDF();
  22.     }
  24.     public static byte[] convertToImg(String base64) throws IOException {
  25.         return Base64.decodeBase64(base64);
  26.     }
  28.     public static void writeByteToImageFile(byte[] imgBytes, String imgFileName) throws IOException {
  29.         File imgFile = new File(imgFileName);
  30.         BufferedImage img = ImageIO.read(new ByteArrayInputStream(imgBytes));
  31.         ImageIO.write(img, "png", imgFile);
  32.     }
  34.     public static void addImageToPDF() throws IOException {
  35.         File file = new File("C:\\Users\\user\\Downloads\\Risk Template(RiskTemplate).pdf");
  36.         PDDocument doc = PDDocument.load(file);
  37.         PDPage page = doc.getPage(0);
  38.         PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\Development\\Workspace\\1\\image.png", doc);
  39.         PDPageContentStream contents = new PDPageContentStream(doc, page);
  40.         contents.drawImage(pdImage, 5, 5);
  41.         System.out.println("Image inserted");
  42.         contents.close();
  43.         doc.save("D:\\Development\\Workspace\\1\\InsertImage_OP.pdf");
  44.         doc.close();
  45.     }
  46. }
英文: 
  1.  import java.awt.image.BufferedImage;  
  2.  import java.io.ByteArrayInputStream;  
  3.  import java.io.File;  
  4.  import java.io.IOException;  
  5.  import java.util.Scanner;  
  6.  import javax.imageio.ImageIO;  
  7.  import org.apache.commons.codec.binary.Base64;
  8.  import java.io.File;
  9.  import java.io.FileOutputStream;
  10.  import java.io.IOException;
  11.  import java.net.MalformedURLException;
  12.  import org.apache.pdfbox.pdmodel.PDDocument; 
  13.  import org.apache.pdfbox.pdmodel.PDPage; 
  14.  import org.apache.pdfbox.pdmodel.PDPageContentStream; 
  15.  import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
  17.  public class One {
  18.       /**  
  19.        * @param args  
  20.        */  
  21.       public static void main(String[] args) throws IOException {
  22.            // TODO Auto-generated method stub  
  23.            Scanner s=new Scanner(System.in);  
  24.            System.out.println("Enter base64 string to be converted to image");  
  25.            String base64=s.nextLine();  
  26.            byte[] base64Val=convertToImg(base64);
  27.            writeByteToImageFile(base64Val, "image.png");
  28.            System.out.println("Saved the base64 as image in current directory with name image.png");
  29.            addImageToPDF();
  30.       }
  31.       public static byte[] convertToImg(String base64) throws IOException  
  32.       {  
  33.            return Base64.decodeBase64(base64);  
  34.       }  
  35.       public static void writeByteToImageFile(byte[] imgBytes, String imgFileName) throws IOException  
  36.       {  
  37.            File imgFile = new File(imgFileName);
  38.            BufferedImage img = ImageIO.read(new ByteArrayInputStream(imgBytes));
  39.            ImageIO.write(img, "png", imgFile);
  40.       }
  41.       
  42.       public static void addImageToPDF() throws IOException {
  43.           File file = new File("C:\\Users\\user\\Downloads\\Risk Template(RiskTemplate).pdf"); 
  44.           PDDocument doc = PDDocument.load(file);  
  45.           PDPage page = doc.getPage(0);
  46.           PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\Development\\Workspace\\1\\image.png", doc); 
  47.           PDPageContentStream contents = new PDPageContentStream(doc, page);
  48.           contents.drawImage(pdImage, 5, 5);     
  49.           System.out.println("Image inserted");  
  50.           contents.close();       
  51.           doc.save("D:\\Development\\Workspace\\1\\InsertImage_OP.pdf"); 
  53.           doc.close();
  54.       }
  55.  }

I am creating an image from base64 string and then trying to attach that image to a pdf. The image is creating successfully and the image is being added to the pdf as well but the pdf (output) contains just the image at a corner and the content of the original pdf is now blank.

答案1

得分: 4

  1. public static void addImageToPDF() throws IOException {
  2.     File file = new File("C:\\Users\\user\\Downloads\\Risk Template(RiskTemplate).pdf"); 
  3.     PDDocument doc = PDDocument.load(file);  
  4.     PDPage page = doc.getPage(0);
  5.     PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\Development\\Workspace\\1\\image.png", doc); 
  6.     PDPageContentStream contents = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true);
  7.     contents.drawImage(pdImage, 5, 5);     
  8.     System.out.println("Image inserted");  
  9.     contents.close();       
  10.     doc.save("D:\\Development\\Workspace\\1\\InsertImage_OP.pdf"); 
  11.     doc.close();
  12. }

Disclaimer: This answer was given by MKL/Tilman but for further reference an answer is more "visible" than a comment.

英文:

As MKL & Tilman have written in their comment you have to use

PDPageContentStream(document, page, AppendMode.APPEND, true, true);

  1. public static void addImageToPDF() throws IOException {
  2. File file = new File("C:\\Users\\user\\Downloads\\Risk Template(RiskTemplate).pdf"); 
  3. PDDocument doc = PDDocument.load(file);  
  4. PDPage page = doc.getPage(0);
  5. PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\Development\\Workspace\\1\\image.png", doc); 
  6. PDPageContentStream contents = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true);
  7. contents.drawImage(pdImage, 5, 5);     
  8. System.out.println("Image inserted");  
  9. contents.close();       
  10. doc.save("D:\\Development\\Workspace\\1\\InsertImage_OP.pdf"); 
  11. doc.close();
  12. }

Disclaimer: This answer was given by MKL/Tilman but for further reference an answer is more "visible" than a comment.

huangapple
  • 本文由 发表于 2020年8月16日 19:35:42
  • 转载请务必保留本文链接：https://go.coder-hub.com/63436366.html
  • java
  • pdfbox
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