qr code generator java class REPLACING THE URL OF A SUBMIT BUTTON in Java

Generating QR Code in Java REPLACING THE URL OF A SUBMIT BUTTON

REPLACING THE URL OF A SUBMIT BUTTON
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You could have used a shortcut to get the widget dictionary in listing 13.16. You ll use this shortcut in the next example to replace the submit URL of the Post button of an AcroForm.
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Listing 13.17 ReplaceURL.java
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PdfReader reader = new PdfReader(src); AcroFields form = reader.getAcroFields(); AcroFields.Item item = form.getFieldItem("post"); PdfDictionary field = item.getMerged(0); PdfDictionary action = field.getAsDict(PdfName.A); PdfDictionary f = action.getAsDict(PdfName.F); f.put(PdfName.F, new PdfString("http://itextpdf.com:8080/book/request")); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); stamper.close();
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Summary
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Almost every example in this chapter is what we call a hack. Each example solves a specific problem, but it probably won t work for every PDF. Manipulating PDFs at the lowest level gives you a lot of power, but you can seriously damage a PDF file if you add, change, or remove objects directly. You should always remember the words of SpiderMan s Uncle Ben: With great power comes great responsibility. It s your responsibility to check ISO-32000-1 to see if your changes result in a valid PDF file. You should also consult the ISO specification if you want to know more about the following entries of the root dictionary: /Threads, /URI, /Lang, /SpiderInfo, /PieceInfo, /Legal, /Requirements, and /Perms. But please read on if you want to know more about /OCProperties, /StructTreeRoot, /MarkInfo, or /Collection, because these will be discussed in the upcoming chapters.
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13.4 Summary
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We started this chapter with a short historical overview: why did the world need PDF, and how did PDF evolve from a de facto standard owned by a company to an ISO standard We looked at different flavors of PDF, such as PDF/A and PDF/X. The history lesson was necessary to understand how and why the Carousel Object System was invented. You opened up one of the PDF documents you created in chapter 1 and learned about the different objects that make a PDF file. You attempted to read this file the same way a PDF viewer would read it, interpreting the different parts in the file structure. You jumped from indirect object to indirect object in the body, following the path defined by indirect references. As you saw, you can do this for a small PDF file, but you need a tool such as iText RUPS as soon as you want to inspect the objects of a larger PDF document. The examples in this book solved specific problems by manipulating PDF documents at the lowest level. These examples were taken from the collection of code snippets that accumulated in the sandbox directory on my computer. Most of these snippets were written in answer to a question on the mailing list, but I selected them in such a way that they explained the mechanisms that can be used to select, change, add, or remove objects when manipulating an existing PDF document. One type of object was deliberately overlooked: PdfStream. When we studied the structure of the Hello World document, we didn t look at the part marked as binary content, and we didn t look at streams representing fonts and images. That s what the next chapters are about.
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The imaging model
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This chapter covers
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The PDF imaging model All methods in PdfContentByte Using Graphics2D to create PDF content
We studied the Carousel Object System in the previous chapter. We used iText to find, remove, change, and replace objects in a PDF file. In this chapter, we ll look at one specific type of object: the stream containing the syntax that makes up a page. First we ll look at the PDF imaging model and learn how to draw graphics and text using PDF syntax. Then we ll look at the Java class java.awt.Graphics2D as an alternative solution for achieving the same results. In both cases, we ll add content at absolute positions as we did in chapter 3. 3 explained the mechanisms available in iText, but this chapter dives straight into the PDF syntax. This chapter includes different tables listing all the possible graphics and text operators and operands. This chapter will serve as a reference that can be used to look up the meaning of the syntax in a PDF file, and to find the iText methods that correspond with this syntax.
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