如何使用java AcroForm PDFBox以编程方式将图像插入到PDFBox字段？
如何使用java AcroForm PDFBox以编程方式将图像插入到PDFBox字段？
提问于 2017-10-17 20:55:35
我已经创建了三个标签简单的PDF文档:名字，姓氏和照片。然后，我使用添加了带有2个“文本字段”和一个“图像字段”的AcroForm层。
因此，如果我想填写表格，我可以打开这个PDF文件在常规Acrobat阅读器和填写通过键入名字，姓氏和为了插入照片，我点击图像占位符，并选择照片在打开的对话框窗口。
但是我如何以编程的方式做同样的事情呢？创建使用Apache2.0.7版本的PDFBox库查找表单字段和插入值的简单。
我可以轻松地填充Text Edit字段，但我不知道如何插入图像：
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!");
}
}我区分了一件奇怪的事情--在Acrobat中，它说我添加了Image，但是我得到的唯一字段是生成的名称：'photo_af_image‘是类型按钮-- PDPushButton (这就是为什么我检查是否(PDPushButton字段)，但与图像无关。
如何将图像插入到AcroForm 'photo_af_image‘字段，使其符合创建的af Acrobat Pro DC?框的大小
Stack Overflow用户
发布于 2017-10-18 22:17:42
我终于找到了一个很好的解决方案。这一解决办法的目标是：
- 使用简单的工具创建具有文本和图像占位符的表单层，这可以由非程序员完成，并且不需要操作低级别的PDF结构；
- 将插入图像的大小由表单创建者使用简单的工具驱动；尺寸由高度驱动，但宽度将按比例调整；
下面用于acroForm占位符插入图像的解决方案的主要思想是：
- 您必须迭代acroForm层并找到具有相应占位符名称的按钮；
- 如果发现字段类型为PDPushButton，则获取其第一个小部件；
- 从图像文件中创建PDImageXObject；
- 使用PDAppearanceStream创建PDImageXObject并设置相同的x&y位置，并调整高度和宽度以匹配占位符的高度；
- 将这个PDAppearanceStream设置为一个小部件；
- 您可以选择将文档扁平化以将顶体层合并为主文档。
这是代码：
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);
}
}请告诉我，如果有更好的解决方案或其他代码，您可以改进。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/46799087
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