PDFBox-如果设置为只读则不显示复选框 [英] PDFBox - checkbox is not displayed if set readonly
问题描述
我正在使用PDFBox生成PDF,我需要在其中添加一个复选框,该复选框需要预先设置为选中和只读.但是有些方法是行不通的.
I am generating PDF using PDFBox, where I need to add a checkbox, which needs to be preset to checked and readonly. But some how it does not work.
请找到以下代码,该代码在PDF上添加了该复选框:
Please find below code, which adds the checkbox on PDF:
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDCheckbox;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;
public class MyTest {
public static void main(String arg[]) throws IOException, COSVisitorException
{
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDPage.PAGE_SIZE_LETTER);
document.addPage(page);
COSDictionary acroFormDict = new COSDictionary();
acroFormDict.setItem(COSName.getPDFName("Fields"), new COSArray()); // Added this line for Tilman's comment
PDAcroForm acroForm = new PDAcroForm(document, acroFormDict);
document.getDocumentCatalog().setAcroForm(acroForm);
float x = 10f;
float y = page.getMediaBox().getHeight();
float yOffset = 15f;
float yCurrent = y - yOffset;
COSDictionary cosDict = new COSDictionary();
COSArray rect = new COSArray();
rect.add(new COSFloat(x));
rect.add(new COSFloat(yCurrent));
rect.add(new COSFloat(x+20));
rect.add(new COSFloat(yCurrent-20));
cosDict.setItem(COSName.RECT, rect);
cosDict.setItem(COSName.FT, COSName.getPDFName("Btn")); // Field Type
cosDict.setItem(COSName.TYPE, COSName.ANNOT);
cosDict.setItem(COSName.SUBTYPE, COSName.getPDFName("Widget"));
cosDict.setItem(COSName.T, new COSString("testChk"));
cosDict.setItem(COSName.DA, new COSString("/Helv 7 Tf 0 g"));
PDCheckbox checkbox = new PDCheckbox(acroForm, cosDict);
// checkbox.setReadonly(true);
// checkbox.setFieldFlags(PDField.FLAG_READ_ONLY);
checkbox.setValue("Yes");
// checkbox.check();
page.getAnnotations().add(checkbox.getWidget());
acroForm.getFields().add(checkbox); // Added this line for Tilman's comment
yCurrent = yCurrent - 20 - yOffset;
File file = new File("C:\\pdf\\CheckBox\\CheckBoxSample1.pdf");
System.out.println("Sample file saved at : " + file.getAbsolutePath());
document.save(file);
document.close();
}
}
现在,如果您取消注释该行:
Now if you uncomment the line:
checkbox.setReadonly(true);
或
checkbox.setFieldFlags(PDField.FLAG_READ_ONLY);
该复选框将不再显示(或可能在此处,但未选中该值). 我正在使用PDFBox 1.8.10
The checkbox will no more displayed (or may be there but value is unchecked). I am using PDFBox 1.8.10
Adobe Reader 11和Foxit中的行为类似.
Behavior is similar in Adobe Reader 11 and Foxit.
如果我在生成PDF时未将框设置为只读,则在Adobe中,我会看到显示的复选框具有设置的值,但是当我使用Tab键将其聚焦时,它就会消失.然后再次聚焦(我单击复选框以外的其他地方),它再次出现.
Also if I generate the PDF without setting the box readonly, in Adobe, I see the checkbox displayed with value set, but when I bring focus on it using tab, it gets disappear. And again on focus out (I click somewhere else other than checkbox), it appears again.
似乎我错过了一件很小的事情,但找不到. 有什么帮助吗? 预先感谢.
It seems like I am missing a very small thing, but could not find out. Any help? Thanks in advance.
推荐答案
您需要使用PDAppearanceCharacteristicsDictionary类提供字段外观.这样可以解决上述问题.
You need to give field appearance using PDAppearanceCharacteristicsDictionary class. That will fix above issue.
请检查下面的示例代码:
Please check sample code below:
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.color.PDGamma;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceCharacteristicsDictionary;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDCheckbox;
public class MyCheckBox {
public static void main(String arg[]) throws IOException, COSVisitorException
{
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDPage.PAGE_SIZE_LETTER);
document.addPage(page);
PDFont font = PDType1Font.HELVETICA;
PDResources res = new PDResources();
String fontName = res.addFont(font);
String da = "/" + fontName + " 10 Tf 0 0.4 0 rg";
COSDictionary acroFormDict = new COSDictionary();
acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), true);
acroFormDict.setItem(COSName.FIELDS, new COSArray());
acroFormDict.setItem(COSName.DA, new COSString(da));
PDAcroForm acroForm = new PDAcroForm(document, acroFormDict);
acroForm.setDefaultResources(res);
document.getDocumentCatalog().setAcroForm(acroForm);
float x = 10f;
float y = page.getMediaBox().getHeight();
float yOffset = 15f;
float yCurrent = y - yOffset;
PDGamma colourBlack = new PDGamma();
PDAppearanceCharacteristicsDictionary fieldAppearance =
new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(colourBlack);
COSArray arr = new COSArray();
arr.add(new COSFloat(227/255f));
arr.add(new COSFloat(239/255f));
arr.add(new COSFloat(1f));
fieldAppearance.setBackground(new PDGamma(arr));
COSDictionary cosDict = new COSDictionary();
COSArray rect = new COSArray();
rect.add(new COSFloat(x));
rect.add(new COSFloat(yCurrent));
rect.add(new COSFloat(x+20));
rect.add(new COSFloat(yCurrent-20));
cosDict.setItem(COSName.RECT, rect);
cosDict.setItem(COSName.FT, COSName.getPDFName("Btn")); // Field Type
cosDict.setItem(COSName.TYPE, COSName.ANNOT);
cosDict.setItem(COSName.SUBTYPE, COSName.getPDFName("Widget"));
cosDict.setItem(COSName.TU, new COSString("Test Checkbox with PDFBox"));
cosDict.setItem(COSName.T, new COSString("testChk"));
cosDict.setItem(COSName.DA, new COSString("/F0 10 Tf 0 0.4 0 rg"));
// cosDict.setInt(COSName.FF, 49152); //Radio Button Symbol
cosDict.setInt(COSName.F, 4);
// cosDict.setInt(COSName.FF, 16384);
PDCheckbox checkbox = new PDCheckbox(acroForm, cosDict);
checkbox.setFieldFlags(PDCheckbox.FLAG_READ_ONLY);
checkbox.setValue("Yes");
// checkbox.setValue("Off");
checkbox.getWidget().setAppearanceCharacteristics(fieldAppearance);
page.getAnnotations().add(checkbox.getWidget());
acroForm.getFields().add(checkbox);
yCurrent = yCurrent - 20 - yOffset;
File file = new File("C:\\pdf\\CheckBoxSample.pdf");
System.out.println("Sample file saved at : " + file.getAbsolutePath());
document.save(file);
document.close();
}
}
这篇关于PDFBox-如果设置为只读则不显示复选框的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!