如何使用PDFBox 2.0创建单选按钮组 [英] How to Create a Radio Button Group with PDFBox 2.0

问题描述

我想使用PDFBox 2.0创建一个单选按钮组，我可以创建3个单选按钮，但是我不知道如何对它们进行分组(PDFBox 1.8，使用

I want to create a Radio Button group using PDFBox 2.0, I am able to create 3 Radio Buttons, but I can't figure out how to group them (PDFBox 1.8, used PDRadioCollection, but 2.0 doesn't.).

如何使用PDFBox 2.0创建单选按钮组?

How do you create a Radio Button Group with PDFBox 2.0?

这是我当前的代码:

        PDDocument document = new PDDocument();
        PDPage page = new PDPage(PDRectangle.A4);
        document.addPage(page);

        PDAcroForm acroForm = new PDAcroForm(document);
        acroForm.setNeedAppearances(true);
        document.getDocumentCatalog().setAcroForm(acroForm);

        PDResources res = new PDResources();
        COSName fontName = res.add(PDTrueTypeFont.load(document, new FileInputStream("C:/Windows/Fonts/arial.ttf"), StandardEncoding.INSTANCE));
        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");
        for (int i = 0; i < options.size(); i++) {
            PDRadioButton button = new PDRadioButton(acroForm);
            button.setPartialName("RadioButton" + options.get(i));

            PDAppearanceCharacteristicsDictionary fieldAppearance = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
            fieldAppearance.setBorderColour(new PDColor(new float[]{0, 0, 0}, PDDeviceRGB.INSTANCE));

            PDAnnotationWidget widget = button.getWidgets().get(0);
            widget.setRectangle(new PDRectangle(30, 800 - i * (21), 16, 16));
            widget.setAppearanceCharacteristics(fieldAppearance);

            acroForm.getFields().add(button);
            page.getAnnotations().add(widget);
        }
        contents.close();
        document.save(new FileOutputStream("RadioButtonTest.pdf"));
        document.close();

推荐答案

通过查看Tilman的建议，并通过一般的uke幸，我得以提出一种看上去像是创建单选按钮组的解决方案.

By looking at Tilman suggestions and by general fluke, I was able to come up with, what looks like, a solution to creating a radio button group.

注意:我已经通过检查Acrobat 11中的pdf来验证结果.

note: I have been verifying my results by checking the pdf in Acrobat 11.

下面是代码:

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++) {

            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);

            widgets.add(widget);
            page.getAnnotations().add(widget);

            // added by Tilman on 13.1.2017, without it Adobe does not set the values properly
            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);


            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();
    }

关键似乎是将每个单选按钮的部分名称设置为相同的值，但是我不能肯定地说.

The key seems to be setting the partial names of each radio button the the same value, but I can't say for sure.

2019年1月17日更新:我是开头提到的"Tilman"，并且为单选按钮创建了更灵活的代码，并将其上传到

Update 17.1.2019: I am the "Tilman" mentioned at the beginning, and have created a more flexible code for radio buttons and uploaded it into the source code repository. It has the advantage that it creates the appearance streams similar to Adobe, so it is no longer needed to call acroForm.setNeedAppearances(true);. The code works with PDFBox 2.0.13 and higher.

这篇关于如何使用PDFBox 2.0创建单选按钮组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！