java barcode reader Reader-enabling a form using Adobe Acrobat in Java

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Reader-enabling a form using Adobe Acrobat
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Choose Advanced > Extend Features in Adobe Acrobat. A dialog box titled Enable Usage Rights in Adobe Reader will open, explaining which features will become available in the free Adobe Reader: saving a form locally, but also commenting, signing, and so on.
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FAQ Can I create a Reader-enabled form using iText The technology that s used to enable a form is based on public-key cryptography, where the viewer of the document (in this case Adobe Reader) has the public key and the authoring software for the document has the private key. Because iText (or any other non-Adobe software) has no access to Adobe s private key, you can only enable documents using Adobe products.
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Once you ve made the form Reader-enabled, you can prefill it using iText; but you have to be aware that users risk being confronted with the alert box shown in figure 8.19.
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Preserving the usage rights of Reader-enabled forms
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Filling out a form programmatically can break Reader-enabling
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The full text of the warning tells you exactly what happened: This document enabled extended features in Adobe Reader. The document has been changed since it was created and use of extended features is no longer available. Please contact the author for the original version of this document. When making a document Reader-enabled using Acrobat, a hash of the content was signed with Adobe s private key. Adobe Reader decrypts this embedded hash and compares it with the current content. If the content hasn t changed, there s a match, and the additional usage rights are active. When filling out a form, iText changes the document structure, and therefore breaks Reader-enabling.
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Filling out Reader-enabled forms using iText
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If you don t want to confront your end users with this warning, you can remove the usage rights. You ll end up with a normal form, without the extra features. Or, you can use PdfStamper in append mode. The result of these two workarounds is shown in figure 8.20. The code for both workarounds is in listing 8.29. The form in the background can no longer be saved locally. The extended features of the form in the foreground remain intact.
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Two workarounds to fill out a Reader Enabled form
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Filling out interactive forms
Listing 8.29 ReaderEnabledForm.java
public void manipulatePdf(String src, String dest, boolean remove, boolean preserve) throws IOException, DocumentException { PdfReader reader = new PdfReader(src); Removes if (remove) usage rights reader.removeUsageRights(); PdfStamper stamper; if (preserve) stamper = new PdfStamper( Preserves reader, new FileOutputStream(dest), '\0', true); usage rights else stamper = new PdfStamper(reader, new FileOutputStream(dest)); } AcroFields form = stamper.getAcroFields(); form.setField( "movie[0].#subform[0].title[0]", "The Misfortunates"); form.setField( "movie[0].#subform[0].original[0]", "De helaasheid der dingen"); form.setField("movie[0].#subform[0].duration[0]", "108"); form.setField("movie[0].#subform[0].year[0]", "2009"); stamper.close(); }
The meaning of the parameters remove and preserve is explained in table 8.4.
Table 8.4 Filling out a Reader-enabled form
remove
preserve
Result You fill out the form as before. This breaks Reader-enabling and causes a scary warning. You fill out the form as before, with removal of the usage rights. With Reader-enabling gone, there s also no more scary warning. You fill out the form, but not as before. By using a different constructor for PdfStamper, you ll create the new PDF in append mode. This means that iText will keep the original PDF intact and append all the changes instead of reorganizing the internal structure.
false true false
false false true
Although a static XFA form is used in this example, this also works for plain old AcroForms.
Summary
In this chapter, we ve explored the two types of interactive forms that are supported in the PDF specification. One of these technologies uses PDF objects to define a form; these forms are called AcroForms, and they can easily be created and manipulated using iText. You learned how to create different types of button, text, and choice fields. At the same time, you found out how to change the properties of these fields in an existing PDF document.
Summary
We focused on filling out forms. Form fields can be organized hierarchically, which changes how forms are filled out. You learned to optimize the process using a field cache. We also looked at flattening a form partially and taking over the flattening process altogether. Then we looked at the other type of form. XFA forms are based on the XML Forms Architecture, and they come in two flavors: static XFA forms and dynamic XFA forms. Most of the static XFA forms can be filled with iText in the same way as AcroForms, using the same code. But when we inspected what an XFA form looks like on the inside, you discovered that there were exceptions. You created a dynamic XFA form using Adobe LiveCycle Designer, and you used iText to inject an XML data file into that form. Finally, you learned more about Reader-enabled forms. Filling such a form with iText can break the extra features that are added to the form, but you learned how to avoid this. This chapter concludes the second part of this book about manipulating existing PDF files. You had an overview of the different manipulation classes in chapter 6; you added links, bookmarks, and annotations to existing documents in chapter 7; and you ve learned almost everything about filling out interactive forms in this chapter. In the next chapter, you ll discover how to integrate the standalone examples we ve looked at so far in a Java servlet; for instance, how to integrate a PDF form in a web application.
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