Question

我想在PDFBOX中创建一个按钮，即验证或重置按钮，该按钮将调用PDF中嵌入式javascript的某些功能。

如何在PDFBOX中创建此类按钮？

我尝试使用PDPushButton代码段跟踪代码，但它现在正常运行。在这里，当我点击按钮区域时，会显示勾选标记符号并在每次点击时切换。边框也没有显示出来。相反，我想显示标签和边框周围的普通按钮。

我正在使用pdfbox版本1.8.10。

PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage(page);            

PDAcroForm acroForm = new PDAcroForm(doc);
        doc.getDocumentCatalog().setAcroForm(acroForm);

        PDActionJavaScript javascript = new PDActionJavaScript("function validate(index){ app.alert(index); }");
        doc.getDocumentCatalog().setOpenAction( javascript );

COSDictionary cosDict = new COSDictionary();
            COSArray rect = new COSArray();
            rect.add(new COSFloat(100));
            rect.add(new COSFloat(10));
            rect.add(new COSFloat(200));
            rect.add(new COSFloat(60));

            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("My Btn"));
            cosDict.setItem(COSName.V, new COSString("Validate"));
            cosDict.setItem(COSName.DA, new COSString("/Helv 7 Tf 0 g"));

            PDPushButton button = new PDPushButton(acroForm, cosDict);
            button.setValue("Validate Button");

            PDActionJavaScript tfJs = new PDActionJavaScript("validate("+index+");");
            PDAnnotationAdditionalActions tfAction = new PDAnnotationAdditionalActions();
            tfAction.setU(tfJs);
            button.getWidget().setActions(tfAction);

            PDGamma colourBlack = new PDGamma();
            PDAppearanceCharacteristicsDictionary fieldAppearance = 
                    new PDAppearanceCharacteristicsDictionary(cosDict);
            fieldAppearance.setBorderColour(colourBlack);
            button.getWidget().setAppearanceCharacteristics(fieldAppearance);

            page.getAnnotations().add(button.getWidget());

            acroForm.getFields().add(button);

Answer 1

以下代码生成带边框的正确按钮，并且还正确调用javascript函数。唯一的问题是在按钮上设置验证标签。如果有人有解决方案，请提供您的反馈。

PDDocument doc = new PDDocument();
        PDPage page = new PDPage();
        doc.addPage(page);   

        COSDictionary acroFormDict = new COSDictionary(); 
        acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), true);
        acroFormDict.setItem(COSName.getPDFName("Fields"), new COSArray());

        PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
        doc.getDocumentCatalog().setAcroForm(acroForm);

        PDActionJavaScript javascript = new PDActionJavaScript("function validate(index){ app.alert(index); }");
        doc.getDocumentCatalog().setOpenAction( javascript );

        COSDictionary cosDict = new COSDictionary();
        COSArray rect = new COSArray();
        rect.add(new COSFloat(100));
        rect.add(new COSFloat(10));
        rect.add(new COSFloat(200));
        rect.add(new COSFloat(60));


        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("Btn"+1));
        cosDict.setItem(COSName.V, new COSString("Validate"));
        cosDict.setItem(COSName.DA, new COSString("/Helv 7 Tf 0 g"));
        cosDict.setInt(COSName.FF, 65536); 

        PDPushButton button = new PDPushButton(acroForm, cosDict);
        button.setValue("Validate Button");

        PDActionJavaScript tfJs = new PDActionJavaScript("validate("+1+");");
        PDAnnotationAdditionalActions tfAction = new PDAnnotationAdditionalActions();
        tfAction.setU(tfJs);
        button.getWidget().setActions(tfAction);

        PDGamma colourBlack = new PDGamma();
        PDAppearanceCharacteristicsDictionary fieldAppearance = 
                new PDAppearanceCharacteristicsDictionary(new COSDictionary());
        fieldAppearance.setBorderColour(colourBlack);
        button.getWidget().setAppearanceCharacteristics(fieldAppearance);

        page.getAnnotations().add(button.getWidget());

        acroForm.getFields().add(button);

         doc.save("/path");
         doc.close();

Answer 2

以下是“如何在PDFBox 2.0.0中为PDPushButton设置标题”的解决方案

要为pushbutton显示字幕值，您需要致电setNormalCaption("captionStr")的{{1}}。
以下是带有文本颜色更改的按钮标题值的代码：

PDAppearanceCharacteristicsDictionary

这里：

    PDDocument doc = new PDDocument();
    PDPage page = new PDPage();
    doc.addPage(page);

    try {
        COSDictionary acroFormDict = new COSDictionary();
        acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), true);
        acroFormDict.setItem(COSName.FIELDS, new COSArray());

        PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
        doc.getDocumentCatalog().setAcroForm(acroForm);

        PDActionJavaScript javascript = new PDActionJavaScript(
                "function validate(index){ app.alert(index); }");
        doc.getDocumentCatalog().setOpenAction(javascript);

        COSDictionary cosDict = new COSDictionary();
        COSArray rect = new COSArray();
        rect.add(new COSFloat(50));
        rect.add(new COSFloat(775));
        rect.add(new COSFloat(100));
        rect.add(new COSFloat(750));
        cosDict.setItem(COSName.RECT, rect);
        cosDict.setItem(COSName.FT, COSName.getPDFName("Btn"));
        cosDict.setItem(COSName.TYPE, COSName.ANNOT);
        cosDict.setItem(COSName.SUBTYPE, COSName.getPDFName("Widget"));
        cosDict.setItem(COSName.T, new COSString("ClickMe"));
        //cosDict.setItem(COSName.V, new COSString("Click Me"));
        cosDict.setItem(COSName.DA, new COSString("/F0 6 Tf 0 g 1 1 1 rg "));

        PDPushButton button = new PDPushButton(acroForm);

        PDActionJavaScript tfJs = new PDActionJavaScript("validate("+1+");");
        PDAnnotationAdditionalActions tfAction = new PDAnnotationAdditionalActions();
        tfAction.setU(tfJs);
        button.getWidgets().get(0).setActions(tfAction);

    //  button.setReadOnly(true);
        button.getCOSObject().addAll(cosDict);
        acroForm.getFields().add(button);

        PDAnnotationWidget widget = button.getWidgets().get(0);

        PDAppearanceCharacteristicsDictionary fieldAppearance = 
                new PDAppearanceCharacteristicsDictionary(new COSDictionary());
        COSArray borderColorArray = new COSArray();
        borderColorArray.add(new COSFloat((float) (141f/255f)));
        borderColorArray.add(new COSFloat((float) (179f/255f)));
        borderColorArray.add(new COSFloat((float) (226f/255f)));
        PDColor blue = new PDColor(borderColorArray, PDDeviceRGB.INSTANCE);
        fieldAppearance.setBorderColour(blue);
        fieldAppearance.setBackground(blue);
        fieldAppearance.setNormalCaption("Click Me");

        widget.setAppearanceCharacteristics(fieldAppearance);
        page.getAnnotations().add(widget);


        File file = new File("/path");
        System.out.println("File created");
        FileOutputStream fOut = new FileOutputStream(file);
        doc.save(fOut);
        doc.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

在这里：

cosDict.setItem(COSName.V, new COSString("Click Me"));

不行。

为此，您需要添加以下行：

button.setValue("Click Me");

以上示例是PDFBox2.0的解决方案在PDFBox 1.8.11中，我认为这也将起作用。：）

如何在PDF BOX中创建按钮？

2 个答案: