PDFBox按钮执行javascript以关闭文档 [英] PDFBox Button execute javascript to close document
问题描述
我的用例是在pdf页面上有一个类似的按钮(确实是将它们添加到现有页面上,但是现在我只想看看它可以在任何东西上工作).
My use case is to have a button like so on a pdf page (really to add them to existing pages but for now I just want to see it work on anything).
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- Back -
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它的作用是关闭当前pdf页面.想法是打开多个选项卡,每个选项卡都是pdf,然后单击后退"按钮将关闭当前pdf,然后将其聚焦到上一个pdf.到目前为止,这是我一直在尝试的方法.
And what it does is just closes the current pdf page. The idea is to have multiple tabs opened and each tab is a pdf and then when you hit the "Back" button it closes the current pdf which will then focus back to the previous pdf. This is what I have been trying to use so far.
// Create a new empty document
try {
PDDocument document = new PDDocument();
// Create a new blank page and add it to the document
PDPage blankPage = new PDPage();
document.addPage( blankPage );
PDBorderStyleDictionary borderULine = new PDBorderStyleDictionary();
borderULine.setStyle(PDBorderStyleDictionary.STYLE_UNDERLINE);
PDColor green = new PDColor(new float[] { 0, 1, 0 }, PDDeviceRGB.INSTANCE);
// PDAnnotationTextMarkup txtMark = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.SUB_TYPE_HIGHLIGHT);
// textWidth = (font.getStringWidth("Click Here") / 1000) * 18;
PDAnnotationLink txtLink = new PDAnnotationLink();
txtLink.setBorderStyle(borderULine);
// add an action
// PDActionURI action = new PDActionURI();
// action.setURI("www.google.com");
PDActionJavaScript action = new PDActionJavaScript("this.closeDoc()");
txtLink.setAction(action);
txtLink.setContents("HI");
txtLink.setColor(green);
PDRectangle position = new PDRectangle();
position.setLowerLeftX(10);
position.setLowerLeftY(20);
position.setUpperRightX(100);
position.setUpperRightY(40);
txtLink.setRectangle(position);
txtLink.setInvisible(false);
blankPage.getAnnotations().add(txtLink);
// Save the newly created document
document.save("C:\\Users\\jsmith\\Desktop\\demo\\BlankPage.pdf");
document.close();
} catch (IOException e) {
e.printStackTrace();
}
而且我似乎看不到pdf页面上的任何内容(全是白色),我确实得到了至少至少能够转到新页面而不是javascript的以下代码,但是它仍然不可见.我只是能够将鼠标悬停在左下方,并注意到我可以单击链接.
And I cant seem to see anything on the pdf page (its just all white), I did get the following code at at least be able to go to a new page instead of the javascript but it was still invisible. I just was able to hover over the bottom left and notice i could click on a link.
PDActionURI action = new PDActionURI();
action.setURI("www.google.com");
推荐答案
Improved answer as discussed in the comments of the OPs own answer, and it also includes the answer from the follow-up question.
PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage(page);
COSDictionary acroFormDict = new COSDictionary();
PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
doc.getDocumentCatalog().setAcroForm(acroForm);
acroForm.setFields(new ArrayList<>());
PDPushButton button = new PDPushButton(acroForm);
button.setPartialName("Btn1");
PDActionJavaScript actionJavaScript = new PDActionJavaScript("this.closeDoc();");
PDAnnotationAdditionalActions additionalActions = new PDAnnotationAdditionalActions();
additionalActions.setU(actionJavaScript);
// widget
PDAnnotationWidget widget = button.getWidgets().get(0);
widget.setActions(additionalActions);
widget.setRectangle(new PDRectangle(100, 700, 100, 50));
PDColor colourBlack = new PDColor(new float[] { 0, 0, 0 }, PDDeviceRGB.INSTANCE);
PDAppearanceCharacteristicsDictionary fieldAppearance
= new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(colourBlack);
widget.setAppearanceCharacteristics(fieldAppearance);
// Create appearance
PDAppearanceDictionary appearanceDictionary = new PDAppearanceDictionary();
PDAppearanceStream appearanceStream = new PDAppearanceStream(doc);
appearanceStream.setResources(new PDResources());
try (PDPageContentStream cs = new PDPageContentStream(doc, appearanceStream))
{
PDRectangle bbox = new PDRectangle(widget.getRectangle().getWidth(), widget.getRectangle().getHeight());
appearanceStream.setBBox(bbox);
cs.setNonStrokingColor(0, 0, 0); // black
cs.addRect(bbox.getLowerLeftX() + 0.5f, bbox.getLowerLeftY() + 0.5f, bbox.getWidth() - 1, bbox.getHeight() - 1);
cs.stroke();
// put some useful text
cs.setFont(PDType1Font.HELVETICA, 20);
cs.beginText();
cs.newLineAtOffset(20, 20);
cs.showText("Close");
cs.endText();
}
appearanceDictionary.setNormalAppearance(appearanceStream);
widget.setAppearance(appearanceDictionary);
page.getAnnotations().add(widget);
acroForm.getFields().add(button);
doc.save("..../Button.pdf");
doc.close();
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