qr code generator java 1.4 Integrating iText in your web applications in Java

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Integrating iText in your web applications
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This is an interesting servlet for debugging web applications. If you send a GET request to it, you ll get an overview of the query string parameters and values that are received on the server side. If you use the POST method, the servlet returns the byte stream that was received by the request. We can use this servlet to inspect the data that is sent to the server from the PDF form.
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SUBMITTING A PDF FORM AS HTML POST
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If you create a submit button with the flag PdfAction.SUBMIT_HTML_FORMAT, the form will be submitted as if the PDF document were an HTML form. It will use the POST method. Figure 9.4 shows what the ShowData servlet received. You ll recognize the fields personal.loginname, personal.name, personal.password, and personal.reason, as well as two unexpected fields: post.x and post.y. You created a submit button with the name post, measuring 50 pt x 30 pt. You also added the PdfAction.SUBMIT_COORDINATES option. As a result, the server receives the X and Y coordinates of the position you ve clicked inside the 50 pt x 30 pt rectangle. Using this option turns your button into a clickable map. The PDF specification also provides the option to submit the data using the GET method (adding the option PdfAction.SUBMIT_HTML_GET), but I don t advise you to do so (just like with using JSP, use this at your own risk).
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The default submit option for AcroForms is submit as FDF.
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SUBMITTING A PDF FORM AS FDF
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When you click the second button shown in figure 9.3, the request servlet will return a file in the FDF. See figure 9.5. FDF is based on PDF; it uses the same syntax and the same file structure. This format is used to export form data to standalone files that can be stored, transmitted electronically, and imported back into the corresponding PDF interactive form. In the next section, you ll take an FDF file similar to the one shown in figure 9.5 and you ll use iText to import the data embedded in the FDF file into a form. FDF is an interesting and compact format if you want to take the data that was posted by end users and save it on the filesystem on server side.
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InputStream of the HttpServletRequest (POST)
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InputStream of the HttpServletRequest (FDF)
You don t need to set any flags to create a submit button that posts an FDF file; just use 0 if you don t need any options. In listing 9.6, you set the option PdfAction. SUBMIT_EXCL_F_KEY. If you omit this option, the URL of the original form (for instance, http://127.0.0.1:8080/book/submit_me.pdf) will be added to the FDF document. There are some other options, but most of them only work if the end user has the full Acrobat; they don t work with Adobe Reader. There s also a limited XML implementation of the FDF: XFDF.
SUBMITTING A PDF FORM AS XFDF
If you look at figure 9.6, you ll see that the XFDF result is more human readable than what was returned in figure 9.5.
InputStream of the HttpServletRequest (XFDF)
Integrating iText in your web applications
The value of the personal.name field can be found in the value tag that is nested inside the field tags with names personal and name. This concludes the overview of the submit methods. In the upcoming examples, you ll use these methods to submit data to a servlet that fills out a form on the server side.
Filling out a form on the server side
Typically, you won t use iText to create interactive forms, but Acrobat, Open Office, or another authoring tool. You ll use iText to automatically fill out forms that were designed manually. In section 9.1.1, we ve integrated the five steps of PDF creation in a servlet; now we ll do the same with a PDF manipulation example.
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