PDFBox 的单选按钮显示问题
Radiobutton display problems with PDFBox
我使用了这个问题的答案中的代码来创建我的单选按钮：
在我创建 PDF 并尝试从中读取（以编程方式）选定的值后，这段代码运行良好：
PDDocumentCatalog catalog = doc.getDocumentCatalog();
PDAcroForm form = catalog.getAcroForm();
List<PDField> fields = form.getFields();
for(PDField field: fields) {
Object value = field.getValueAsString();
String name = field.getFullyQualifiedName();
if (field instanceof PDRadioButton) {
// value is correct and field is instance of PDRadioButton works too
}
}
当我在 Acrobat Reader DC 中打开 PDF 时，进行更改并再次保存代码不再起作用。不再有 PDRadioButton 实例，值始终为空字符串。
当我在 Acrobat Touch 中打开 PDF 时，它甚至无法正确显示。
（我打开之前用Acrobat Reader DC编辑过的版本，Acrobat Touch可以正确显示）
任何建议代码可能有什么问题？
这是一个行为相同的最小示例：
package test;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceCharacteristicsDictionary;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDRadioButton;
public class WriterTest {
public static void main(String[] args) {
try {
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
document.addPage(page);
PDAcroForm acroForm = new PDAcroForm(document);
acroForm.setNeedAppearances(true);
acroForm.setXFA(null);
document.getDocumentCatalog().setAcroForm(acroForm);
PDFont font = PDType1Font.HELVETICA;
PDResources res = new PDResources();
COSName fontName = res.add(font);
acroForm.setDefaultResources(res);
acroForm.setDefaultAppearance('/' + fontName.getName() + " 10 Tf 0 g");
PDPageContentStream contents = new PDPageContentStream(document, page);
List<String> options = Arrays.asList("a", "b", "c");
PDRadioButton radioButton = new PDRadioButton(acroForm);
radioButton.setPartialName("RadioButtonParent");
radioButton.setExportValues(options);
radioButton.getCOSObject().setName(COSName.DV, options.get(1));
List<PDAnnotationWidget> widgets = new ArrayList<>();
for (int i = 0; i < options.size(); i++) {
PDRadioButton subRadioButtons = new PDRadioButton(acroForm);
subRadioButtons.setPartialName("RadioButton");
PDAppearanceCharacteristicsDictionary fieldAppearance = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(new PDColor(new float[] { 0, 0, 0 }, PDDeviceRGB.INSTANCE));
PDAnnotationWidget widget = subRadioButtons.getWidgets().get(0);
widget.setRectangle(new PDRectangle(30, 811 - i * (21), 16, 16));
widget.setAppearanceCharacteristics(fieldAppearance);
widgets.add(widget);
page.getAnnotations().add(widget);
contents.beginText();
contents.setFont(font, 10);
contents.newLineAtOffset(56, 811 - i * (21) + 4);
contents.showText(options.get(i));
contents.endText();
}
radioButton.setWidgets(widgets);
acroForm.getFields().add(radioButton);
contents.close();
try (FileOutputStream output = new FileOutputStream("test.pdf")) {
document.save(output);
}
document.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
您的代码显示字段树的顶部。 getFields() 的 javadoc 对此发出警告：
/**
* This will return all of the documents root fields.
*
* A field might have children that are fields (non-terminal field) or does not
* have children which are fields (terminal fields).
*
* The fields within an AcroForm are organized in a tree structure. The documents root fields
* might either be terminal fields, non-terminal fields or a mixture of both. Non-terminal fields
* mark branches which contents can be retrieved using {@link PDNonTerminalField#getChildren()}.
*
* @return A list of the documents root fields.
*
*/
public List<PDField> getFields()
要获取所有字段（包括非终结符字段），请执行以下操作：
PDDocumentCatalog catalog = doc.getDocumentCatalog();
PDAcroForm form = catalog.getAcroForm();
Iterator<PDField> fieldIterator = form.getFieldIterator();
while (fieldIterator.hasNext())
{
PDField field = fieldIterator.next();
// ... do stuff ...
}
然后您的单选按钮出现。
但是还有一个问题。选择返回为 "a"、"b" 或 "Choice1" 而不是 "c".
我能够通过在添加小部件之前添加此代码段来解决此问题：
PDAppearanceDictionary appearance = new PDAppearanceDictionary();
COSDictionary dict = new COSDictionary();
dict.setItem(COSName.getPDFName("Off"), new COSDictionary());
dict.setItem(COSName.getPDFName(options.get(i)), new COSDictionary());
PDAppearanceEntry appearanceEntry = new PDAppearanceEntry(dict);
appearance.setNormalAppearance(appearanceEntry);
widget.setAppearance(appearance);
它为每个按钮添加 "Off" 和 on-Option 的空外观。
2017 年 1 月 17 日更新：
这是生成带有外观流的单选按钮的源代码：
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
document.addPage(page);
PDAcroForm acroForm = new PDAcroForm(document);
// not needed, we have appearance streams
//acroForm.setNeedAppearances(true);
acroForm.setXFA(null);
document.getDocumentCatalog().setAcroForm(acroForm);
PDFont font = PDType1Font.HELVETICA;
PDResources res = new PDResources();
COSName fontName = res.add(font);
acroForm.setDefaultResources(res);
acroForm.setDefaultAppearance('/' + fontName.getName() + " 10 Tf 0 g");
PDPageContentStream contents = new PDPageContentStream(document, page);
List<String> options = Arrays.asList("a", "b", "c");
PDRadioButton radioButton = new PDRadioButton(acroForm);
radioButton.setPartialName("RadioButtonParent");
// removed per advice of Maruan Sahyoun, setValue didn't work anymore
//radioButton.setExportValues(options);
radioButton.getCOSObject().setName(COSName.DV, options.get(1));
radioButton.setFieldFlags(49152);
int on = 1;
List<PDAnnotationWidget> widgets = new ArrayList<>();
for (int i = 0; i < options.size(); i++)
{
PDAppearanceCharacteristicsDictionary fieldAppearance = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(new PDColor(new float[] { 0, 0, 0 }, PDDeviceRGB.INSTANCE));
PDAnnotationWidget widget = new PDAnnotationWidget();
widget.setRectangle(new PDRectangle(30, 811 - i * (21), 16, 16));
widget.setAppearanceCharacteristics(fieldAppearance);
widget.setAnnotationFlags(4);
widget.setPage(page);
widget.setParent(radioButton);
String offNString = "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q";
String onNString = "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 3.5 0 m\n"
+ " 3.5 1.9331 1.9331 3.5 0 3.5 c\n"
+ " -1.9331 3.5 -3.5 1.9331 -3.5 0 c\n"
+ " -3.5 -1.9331 -1.9331 -3.5 0 -3.5 c\n"
+ " 1.9331 -3.5 3.5 -1.9331 3.5 0 c\n"
+ " f\n"
+ "Q";
String offDString = "0.749023 g\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 8 0 m\n"
+ " 8 4.4185 4.4185 8 0 8 c\n"
+ " -4.4185 8 -8 4.4185 -8 0 c\n"
+ " -8 -4.4185 -4.4185 -8 0 -8 c\n"
+ " 4.4185 -8 8 -4.4185 8 0 c\n"
+ " f\n"
+ "Q\n"
+ "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q";
String onDString = "0.749023 g\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 8 0 m\n"
+ " 8 4.4185 4.4185 8 0 8 c\n"
+ " -4.4185 8 -8 4.4185 -8 0 c\n"
+ " -8 -4.4185 -4.4185 -8 0 -8 c\n"
+ " 4.4185 -8 8 -4.4185 8 0 c\n"
+ " f\n"
+ "Q\n"
+ "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q\n"
+ "0 g\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 3.5 0 m\n"
+ " 3.5 1.9331 1.9331 3.5 0 3.5 c\n"
+ " -1.9331 3.5 -3.5 1.9331 -3.5 0 c\n"
+ " -3.5 -1.9331 -1.9331 -3.5 0 -3.5 c\n"
+ " 1.9331 -3.5 3.5 -1.9331 3.5 0 c\n"
+ " f\n"
+ "Q";
COSDictionary apNDict = new COSDictionary();
COSStream offNStream = new COSStream();
offNStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
offNStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
offNStream.setItem(COSName.TYPE, COSName.XOBJECT);
offNStream.setItem(COSName.SUBTYPE, COSName.FORM);
OutputStream os = offNStream.createOutputStream(COSName.FLATE_DECODE);
os.write(offNString.getBytes());
os.close();
apNDict.setItem(COSName.Off, offNStream);
COSStream onNStream = new COSStream();
onNStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
onNStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
onNStream.setItem(COSName.TYPE, COSName.XOBJECT);
onNStream.setItem(COSName.SUBTYPE, COSName.FORM);
os = onNStream.createOutputStream(COSName.FLATE_DECODE);
os.write(onNString.getBytes());
os.close();
apNDict.setItem(options.get(i), onNStream);
COSDictionary apDDict = new COSDictionary();
COSStream offDStream = new COSStream();
offDStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
offDStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
offDStream.setItem(COSName.TYPE, COSName.XOBJECT);
offDStream.setItem(COSName.SUBTYPE, COSName.FORM);
os = offDStream.createOutputStream(COSName.FLATE_DECODE);
os.write(offDString.getBytes());
os.close();
apDDict.setItem(COSName.Off, offDStream);
COSStream onDStream = new COSStream();
onDStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
onDStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
onDStream.setItem(COSName.TYPE, COSName.XOBJECT);
onDStream.setItem(COSName.SUBTYPE, COSName.FORM);
os = onDStream.createOutputStream(COSName.FLATE_DECODE);
os.write(onDString.getBytes());
os.close();
apDDict.setItem(options.get(i), onDStream);
PDAppearanceDictionary appearance = new PDAppearanceDictionary();
PDAppearanceEntry appearanceNEntry = new PDAppearanceEntry(apNDict);
appearance.setNormalAppearance(appearanceNEntry);
PDAppearanceEntry appearanceDEntry = new PDAppearanceEntry(apDDict);
appearance.setDownAppearance(appearanceDEntry);
widget.setAppearance(appearance);
widget.setAppearanceState(i == on ? options.get(i) : "Off");
widgets.add(widget);
page.getAnnotations().add(widget);
contents.beginText();
contents.setFont(font, 10);
contents.newLineAtOffset(56, 811 - i * (21) + 4);
contents.showText(options.get(i));
contents.endText();
}
radioButton.setWidgets(widgets);
acroForm.getFields().add(radioButton);
contents.close();
try (FileOutputStream output = new FileOutputStream("test.pdf"))
{
document.save(output);
}
document.close();
如果您希望 Adobe 生成外观流（即代码中的 "gibberish"），请调用 setNeedAppearances(true) 并删除行 widget.setAppearance(appearance);。如果你用 Adobe 打开文件并保存它，就会生成外观流，这就是我从那里得到的。如果您查看注释，然后查看 AP 并从那里往下看，您可以使用 PDFDebugger 查看这些内容。
如果您想了解较大按钮的外观流内容，这也是可以使用的策略。
将来某个时候PDFBox 会生成按钮的外观流。涉及一些数学，请参阅 here 或 PDCircleAppearanceHandler 中的主干源代码。
我使用了这个问题的答案中的代码来创建我的单选按钮：
在我创建 PDF 并尝试从中读取（以编程方式）选定的值后，这段代码运行良好：
PDDocumentCatalog catalog = doc.getDocumentCatalog();
PDAcroForm form = catalog.getAcroForm();
List<PDField> fields = form.getFields();
for(PDField field: fields) {
Object value = field.getValueAsString();
String name = field.getFullyQualifiedName();
if (field instanceof PDRadioButton) {
// value is correct and field is instance of PDRadioButton works too
}
}
当我在 Acrobat Reader DC 中打开 PDF 时，进行更改并再次保存代码不再起作用。不再有 PDRadioButton 实例，值始终为空字符串。
当我在 Acrobat Touch 中打开 PDF 时，它甚至无法正确显示。
（我打开之前用Acrobat Reader DC编辑过的版本，Acrobat Touch可以正确显示）
任何建议代码可能有什么问题？
这是一个行为相同的最小示例：
package test;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceCharacteristicsDictionary;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDRadioButton;
public class WriterTest {
public static void main(String[] args) {
try {
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
document.addPage(page);
PDAcroForm acroForm = new PDAcroForm(document);
acroForm.setNeedAppearances(true);
acroForm.setXFA(null);
document.getDocumentCatalog().setAcroForm(acroForm);
PDFont font = PDType1Font.HELVETICA;
PDResources res = new PDResources();
COSName fontName = res.add(font);
acroForm.setDefaultResources(res);
acroForm.setDefaultAppearance('/' + fontName.getName() + " 10 Tf 0 g");
PDPageContentStream contents = new PDPageContentStream(document, page);
List<String> options = Arrays.asList("a", "b", "c");
PDRadioButton radioButton = new PDRadioButton(acroForm);
radioButton.setPartialName("RadioButtonParent");
radioButton.setExportValues(options);
radioButton.getCOSObject().setName(COSName.DV, options.get(1));
List<PDAnnotationWidget> widgets = new ArrayList<>();
for (int i = 0; i < options.size(); i++) {
PDRadioButton subRadioButtons = new PDRadioButton(acroForm);
subRadioButtons.setPartialName("RadioButton");
PDAppearanceCharacteristicsDictionary fieldAppearance = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(new PDColor(new float[] { 0, 0, 0 }, PDDeviceRGB.INSTANCE));
PDAnnotationWidget widget = subRadioButtons.getWidgets().get(0);
widget.setRectangle(new PDRectangle(30, 811 - i * (21), 16, 16));
widget.setAppearanceCharacteristics(fieldAppearance);
widgets.add(widget);
page.getAnnotations().add(widget);
contents.beginText();
contents.setFont(font, 10);
contents.newLineAtOffset(56, 811 - i * (21) + 4);
contents.showText(options.get(i));
contents.endText();
}
radioButton.setWidgets(widgets);
acroForm.getFields().add(radioButton);
contents.close();
try (FileOutputStream output = new FileOutputStream("test.pdf")) {
document.save(output);
}
document.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
您的代码显示字段树的顶部。 getFields() 的 javadoc 对此发出警告：
/**
* This will return all of the documents root fields.
*
* A field might have children that are fields (non-terminal field) or does not
* have children which are fields (terminal fields).
*
* The fields within an AcroForm are organized in a tree structure. The documents root fields
* might either be terminal fields, non-terminal fields or a mixture of both. Non-terminal fields
* mark branches which contents can be retrieved using {@link PDNonTerminalField#getChildren()}.
*
* @return A list of the documents root fields.
*
*/
public List<PDField> getFields()
要获取所有字段（包括非终结符字段），请执行以下操作：
PDDocumentCatalog catalog = doc.getDocumentCatalog();
PDAcroForm form = catalog.getAcroForm();
Iterator<PDField> fieldIterator = form.getFieldIterator();
while (fieldIterator.hasNext())
{
PDField field = fieldIterator.next();
// ... do stuff ...
}
然后您的单选按钮出现。
但是还有一个问题。选择返回为 "a"、"b" 或 "Choice1" 而不是 "c".
我能够通过在添加小部件之前添加此代码段来解决此问题：
PDAppearanceDictionary appearance = new PDAppearanceDictionary();
COSDictionary dict = new COSDictionary();
dict.setItem(COSName.getPDFName("Off"), new COSDictionary());
dict.setItem(COSName.getPDFName(options.get(i)), new COSDictionary());
PDAppearanceEntry appearanceEntry = new PDAppearanceEntry(dict);
appearance.setNormalAppearance(appearanceEntry);
widget.setAppearance(appearance);
它为每个按钮添加 "Off" 和 on-Option 的空外观。
2017 年 1 月 17 日更新：
这是生成带有外观流的单选按钮的源代码：
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
document.addPage(page);
PDAcroForm acroForm = new PDAcroForm(document);
// not needed, we have appearance streams
//acroForm.setNeedAppearances(true);
acroForm.setXFA(null);
document.getDocumentCatalog().setAcroForm(acroForm);
PDFont font = PDType1Font.HELVETICA;
PDResources res = new PDResources();
COSName fontName = res.add(font);
acroForm.setDefaultResources(res);
acroForm.setDefaultAppearance('/' + fontName.getName() + " 10 Tf 0 g");
PDPageContentStream contents = new PDPageContentStream(document, page);
List<String> options = Arrays.asList("a", "b", "c");
PDRadioButton radioButton = new PDRadioButton(acroForm);
radioButton.setPartialName("RadioButtonParent");
// removed per advice of Maruan Sahyoun, setValue didn't work anymore
//radioButton.setExportValues(options);
radioButton.getCOSObject().setName(COSName.DV, options.get(1));
radioButton.setFieldFlags(49152);
int on = 1;
List<PDAnnotationWidget> widgets = new ArrayList<>();
for (int i = 0; i < options.size(); i++)
{
PDAppearanceCharacteristicsDictionary fieldAppearance = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(new PDColor(new float[] { 0, 0, 0 }, PDDeviceRGB.INSTANCE));
PDAnnotationWidget widget = new PDAnnotationWidget();
widget.setRectangle(new PDRectangle(30, 811 - i * (21), 16, 16));
widget.setAppearanceCharacteristics(fieldAppearance);
widget.setAnnotationFlags(4);
widget.setPage(page);
widget.setParent(radioButton);
String offNString = "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q";
String onNString = "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 3.5 0 m\n"
+ " 3.5 1.9331 1.9331 3.5 0 3.5 c\n"
+ " -1.9331 3.5 -3.5 1.9331 -3.5 0 c\n"
+ " -3.5 -1.9331 -1.9331 -3.5 0 -3.5 c\n"
+ " 1.9331 -3.5 3.5 -1.9331 3.5 0 c\n"
+ " f\n"
+ "Q";
String offDString = "0.749023 g\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 8 0 m\n"
+ " 8 4.4185 4.4185 8 0 8 c\n"
+ " -4.4185 8 -8 4.4185 -8 0 c\n"
+ " -8 -4.4185 -4.4185 -8 0 -8 c\n"
+ " 4.4185 -8 8 -4.4185 8 0 c\n"
+ " f\n"
+ "Q\n"
+ "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q";
String onDString = "0.749023 g\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 8 0 m\n"
+ " 8 4.4185 4.4185 8 0 8 c\n"
+ " -4.4185 8 -8 4.4185 -8 0 c\n"
+ " -8 -4.4185 -4.4185 -8 0 -8 c\n"
+ " 4.4185 -8 8 -4.4185 8 0 c\n"
+ " f\n"
+ "Q\n"
+ "0 G\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 7.5 0 m\n"
+ " 7.5 4.1423 4.1423 7.5 0 7.5 c\n"
+ " -4.1423 7.5 -7.5 4.1423 -7.5 0 c\n"
+ " -7.5 -4.1423 -4.1423 -7.5 0 -7.5 c\n"
+ " 4.1423 -7.5 7.5 -4.1423 7.5 0 c\n"
+ " s\n"
+ "Q\n"
+ "0 g\n"
+ "q\n"
+ " 1 0 0 1 8 8 cm\n"
+ " 3.5 0 m\n"
+ " 3.5 1.9331 1.9331 3.5 0 3.5 c\n"
+ " -1.9331 3.5 -3.5 1.9331 -3.5 0 c\n"
+ " -3.5 -1.9331 -1.9331 -3.5 0 -3.5 c\n"
+ " 1.9331 -3.5 3.5 -1.9331 3.5 0 c\n"
+ " f\n"
+ "Q";
COSDictionary apNDict = new COSDictionary();
COSStream offNStream = new COSStream();
offNStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
offNStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
offNStream.setItem(COSName.TYPE, COSName.XOBJECT);
offNStream.setItem(COSName.SUBTYPE, COSName.FORM);
OutputStream os = offNStream.createOutputStream(COSName.FLATE_DECODE);
os.write(offNString.getBytes());
os.close();
apNDict.setItem(COSName.Off, offNStream);
COSStream onNStream = new COSStream();
onNStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
onNStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
onNStream.setItem(COSName.TYPE, COSName.XOBJECT);
onNStream.setItem(COSName.SUBTYPE, COSName.FORM);
os = onNStream.createOutputStream(COSName.FLATE_DECODE);
os.write(onNString.getBytes());
os.close();
apNDict.setItem(options.get(i), onNStream);
COSDictionary apDDict = new COSDictionary();
COSStream offDStream = new COSStream();
offDStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
offDStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
offDStream.setItem(COSName.TYPE, COSName.XOBJECT);
offDStream.setItem(COSName.SUBTYPE, COSName.FORM);
os = offDStream.createOutputStream(COSName.FLATE_DECODE);
os.write(offDString.getBytes());
os.close();
apDDict.setItem(COSName.Off, offDStream);
COSStream onDStream = new COSStream();
onDStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
onDStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
onDStream.setItem(COSName.TYPE, COSName.XOBJECT);
onDStream.setItem(COSName.SUBTYPE, COSName.FORM);
os = onDStream.createOutputStream(COSName.FLATE_DECODE);
os.write(onDString.getBytes());
os.close();
apDDict.setItem(options.get(i), onDStream);
PDAppearanceDictionary appearance = new PDAppearanceDictionary();
PDAppearanceEntry appearanceNEntry = new PDAppearanceEntry(apNDict);
appearance.setNormalAppearance(appearanceNEntry);
PDAppearanceEntry appearanceDEntry = new PDAppearanceEntry(apDDict);
appearance.setDownAppearance(appearanceDEntry);
widget.setAppearance(appearance);
widget.setAppearanceState(i == on ? options.get(i) : "Off");
widgets.add(widget);
page.getAnnotations().add(widget);
contents.beginText();
contents.setFont(font, 10);
contents.newLineAtOffset(56, 811 - i * (21) + 4);
contents.showText(options.get(i));
contents.endText();
}
radioButton.setWidgets(widgets);
acroForm.getFields().add(radioButton);
contents.close();
try (FileOutputStream output = new FileOutputStream("test.pdf"))
{
document.save(output);
}
document.close();
如果您希望 Adobe 生成外观流（即代码中的 "gibberish"），请调用 setNeedAppearances(true) 并删除行 widget.setAppearance(appearance);。如果你用 Adobe 打开文件并保存它，就会生成外观流，这就是我从那里得到的。如果您查看注释，然后查看 AP 并从那里往下看，您可以使用 PDFDebugger 查看这些内容。
如果您想了解较大按钮的外观流内容，这也是可以使用的策略。
将来某个时候PDFBox 会生成按钮的外观流。涉及一些数学，请参阅 here 或 PDCircleAppearanceHandler 中的主干源代码。