http://m.blog.csdn.net/article/details?id=5603073

http://www.pudn.com/downloads140/sourcecode/windows/dotnet/detail603276.html

http://www.docjar.com/html/api/com/itextpdf/text/pdf/AcroFields.java.html

http://www.c-sharpcorner.com/article/fill-in-pdf-form-fields-using-the-open-source-itextsharp-dll/

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