如何使用java PDFBox以编程方式将图像插入AcroForm字段？

问题描述：

我已经创建了3个标签的简单PDF文档：名字，姓氏和照片。然后，我使用Adobe Acrobat PRO DC将2个“文本字段”和一个“图像字段”添加到AcroForm图层。如何使用java PDFBox以编程方式将图像插入AcroForm字段？

所以，如果我要填写我可以在常规的Acrobat Reader中打开该PDF文件，并通过键入名字，姓氏填满，以便插入图片的形式我点击图像占位符和在打开的对话窗口中选择照片。

但我怎么能做到同样的事情编程？创建使用Apache PDFBox库（版本2.0.7）来查找表单域并插入值的简单Java应用程序。

我可以很容易地填充文本编辑字段，但无法弄清楚如何我可以插入图片：

public class AcroFormPopulator { 

    public static void main(String[] args) { 

     AcroFormPopulator abd = new AcroFormPopulator(); 
     try { 
      abd.populateAndCopy("test.pdf", "generated.pdf"); 

     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    private void populateAndCopy(String originalPdf, String targetPdf) throws IOException { 
     File file = new File(originalPdf); 

     PDDocument document = PDDocument.load(file); 
     PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm(); 

     Map<String, String> data = new HashMap<>(); 
     data.put("firstName", "Mike"); 
     data.put("lastName", "Taylor"); 
     data.put("photo_af_image", "photo.jpeg"); 

     for (Map.Entry<String, String> item : data.entrySet()) { 
      PDField field = acroForm.getField(item.getKey()); 
      if (field != null) { 

       if (field instanceof PDTextField) { 
        field.setValue(item.getValue()); 

       } else if (field instanceof PDPushButton) { 
        File imageFile = new File(item.getValue()); 

        PDPushButton pdPushButton = (PDPushButton) field; 
        // do not see way to isert image 

       } else { 
        System.err.println("No field found with name:" + item.getKey()); 
       } 
      } else { 
       System.err.println("No field found with name:" + item.getKey()); 
      } 
     } 

     document.save(targetPdf); 
     document.close(); 
     System.out.println("Populated!"); 
    } 
}

我有杰出一个奇怪的事情 - 在Acrobat Pro的DC，它说，我添加图片的领域，但我得到的唯一字段是：'photo_af_image'是类型按钮 - PDPushButton（这就是为什么我检查是否（field instanceof PDPushButton）），但与Image无关。

如何将图像插入到AcroForm'photo_af_image'字段，以便它适合Acrobat Pro DC创建的盒子的尺寸？

答

我终于找到并建立了很好的解决方案。该解决方案的目标是：

创建具有使用简单工具，它可以通过非程序员来完成，并不需要到操纵低水平PDF结构的文本和图像占位符的形式层;
使插入图像的大小由窗体创建者使用简单工具驱动;大小由高度驱动，但宽度将按比例调整;

的下面用于通过acroForm占位符插入图像溶液的主要思想是：

你必须遍历acroForm层，并用发现按钮对应占位符的名称;
如果找到字段类型为PDPushButton，则获取其第一个小部件;
从图像文件创建PDImageXObject;
使用PDImageXObject创建PDAppearanceStream并设置相同的x位置，并调整高度和宽度以匹配占位符的高度;
将此PDAppearanceStream设置为小部件;
您可以选择拼合文档合并acroform躺着主要原因之一

这里是代码：

import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.IOException; 
import java.util.Date; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 

import javax.imageio.ImageIO; 

import org.apache.pdfbox.cos.COSArray; 
import org.apache.pdfbox.cos.COSDictionary; 
import org.apache.pdfbox.cos.COSName; 
import org.apache.pdfbox.pdmodel.PDDocument; 
import org.apache.pdfbox.pdmodel.PDPageContentStream; 
import org.apache.pdfbox.pdmodel.PDResources; 
import org.apache.pdfbox.pdmodel.common.PDRectangle; 
import org.apache.pdfbox.pdmodel.graphics.image.LosslessFactory; 
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject; 
import org.apache.pdfbox.pdmodel.interactive.action.PDAction; 
import org.apache.pdfbox.pdmodel.interactive.action.PDActionHide; 
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget; 
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceDictionary; 
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceStream; 
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm; 
import org.apache.pdfbox.pdmodel.interactive.form.PDField; 
import org.apache.pdfbox.pdmodel.interactive.form.PDPushButton; 
import org.apache.pdfbox.pdmodel.interactive.form.PDTextField; 

public class AcroFormPopulator { 

    public static void main(String[] args) { 
     AcroFormPopulator abd = new AcroFormPopulator(); 
     try { 
      Map<String, String> data = new HashMap<>(); 
      data.put("firstName", "Mike"); 
      data.put("lastName", "Taylor"); 
      data.put("dateTime", (new Date()).toString()); 
      data.put("photo_af_image", "photo1.jpg"); 
      data.put("photo2_af_image", "photo2.jpg"); 
      data.put("photo3_af_image", "photo3.jpg"); 

      abd.populateAndCopy("test.pdf", "generated.pdf", data); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    private void populateAndCopy(String originalPdf, String targetPdf, Map<String, String> data) throws IOException { 
     File file = new File(originalPdf); 
     PDDocument document = PDDocument.load(file); 
     PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm(); 

     for (Map.Entry<String, String> item : data.entrySet()) { 
      String key = item.getKey(); 
      PDField field = acroForm.getField(key); 
      if (field != null) { 
       System.out.print("Form field with placeholder name: '" + key + "' found"); 

       if (field instanceof PDTextField) { 
        System.out.println("(type: " + field.getClass().getSimpleName() + ")"); 
        field.setValue(item.getValue()); 
        System.out.println("value is set to: '" + item.getValue() + "'"); 

       } else if (field instanceof PDPushButton) { 
        System.out.println("(type: " + field.getClass().getSimpleName() + ")"); 
        PDPushButton pdPushButton = (PDPushButton) field; 

        List<PDAnnotationWidget> widgets = pdPushButton.getWidgets(); 
        if (widgets != null && widgets.size() > 0) { 
         PDAnnotationWidget annotationWidget = widgets.get(0); // just need one widget 

         String filePath = item.getValue(); 
         File imageFile = new File(filePath); 

         if (imageFile.exists()) { 
          /* 
          * BufferedImage bufferedImage = ImageIO.read(imageFile); 
          * PDImageXObject pdImageXObject = LosslessFactory.createFromImage(document, bufferedImage); 
          */ 
          PDImageXObject pdImageXObject = PDImageXObject.createFromFile(filePath, document); 
          float imageScaleRatio = (float) pdImageXObject.getHeight()/(float) pdImageXObject.getWidth(); 

          PDRectangle buttonPosition = getFieldArea(pdPushButton); 
          float height = buttonPosition.getHeight(); 
          float width = height/imageScaleRatio; 
          float x = buttonPosition.getLowerLeftX(); 
          float y = buttonPosition.getLowerLeftY(); 

          PDAppearanceStream pdAppearanceStream = new PDAppearanceStream(document); 
          pdAppearanceStream.setResources(new PDResources()); 
          try (PDPageContentStream pdPageContentStream = new PDPageContentStream(document, pdAppearanceStream)) { 
           pdPageContentStream.drawImage(pdImageXObject, x, y, width, height); 
          } 
          pdAppearanceStream.setBBox(new PDRectangle(x, y, width, height)); 

          PDAppearanceDictionary pdAppearanceDictionary = annotationWidget.getAppearance(); 
          if (pdAppearanceDictionary == null) { 
           pdAppearanceDictionary = new PDAppearanceDictionary(); 
           annotationWidget.setAppearance(pdAppearanceDictionary); 
          } 

          pdAppearanceDictionary.setNormalAppearance(pdAppearanceStream); 
          System.out.println("Image '" + filePath + "' inserted"); 

         } else { 
          System.err.println("File " + filePath + " not found"); 
         } 
        } else { 
         System.err.println("Missconfiguration of placeholder: '" + key + "' - no widgets(actions) found"); 
        } 
       } else { 
        System.err.print("Unexpected form field type found with placeholder name: '" + key + "'"); 
       } 
      } else { 
       System.err.println("No field found with name:" + key); 
      } 
     } 

     // you can optionally flatten the document to merge acroform lay to main one 
     acroForm.flatten(); 

     document.save(targetPdf); 
     document.close(); 
     System.out.println("Done"); 
    } 

    private PDRectangle getFieldArea(PDField field) { 
     COSDictionary fieldDict = field.getCOSObject(); 
     COSArray fieldAreaArray = (COSArray) fieldDict.getDictionaryObject(COSName.RECT); 
     return new PDRectangle(fieldAreaArray); 
    } 
}

请让我知道是否有更好的解决办法什么的这段代码可以提高。

如何使用java PDFBox以编程方式将图像插入AcroForm字段？

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