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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The second problem, avoiding a browser timeout, can be solved by moving the five steps of the PDF creation process to a separate thread. You can add your Runnable implementation as an attribute to the HttpSession object. As long as the PDF document isn t ready, send an HTML page to the browser that is refreshed on a regular basis, such as every three seconds. Check the thread with every hit; serve the PDF as soon as the document is closed. Not only does this solution solve the technical timeout problem, it also works on a psychological level. People tend to be impatient. They don t like to wait for that internet page to come, not knowing if the connection got lost, whether or not they should hit the reload button, or if the server went down... Give them feedback if possible, a progress bar showing the percentage of data that has been processed and time seems to go a lot faster! Usually, I implement the doPost() method to accept parameters and to set up the thread; then I cause a redirect to trigger the doGet() method that serves the HTML and eventually the finished PDF.
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GET VERSUS POST
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A trivial problem, but one that is easily overlooked, is what happens when people bookmark pages that are the result of a POST action. When they want to return to that page using the bookmark, they initiate a GET request, getting a result that differs from what they expect. You can do the experiment with the example from listing 9.3. Figure 9.2 shows the URL http://itextpdf.org:8180/book/ opened in a Firefox window. This page contains two simple forms: one that uses the GET method, the other
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PDFs created with GET and POST actions
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Creating a PDF from a servlet
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using the POST method. Recall that neither doGet() nor doPost() were implemented in listing 9.3. Instead you overrode the service() method that works in both cases. We ll conclude the list of client-side issues with the multiple-hit problem.
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PROBLEMS CAUSED BY MULTIPLE HITS
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In web analytics, a hit is when an end user requests a page from your web server and this page is sent to the user s browser directly. For example, when you enter the URI http://itextpdf.org:8180/book/hello.pdf in the location bar, one PDF file opens in your browser window using a PDF viewer plug-in. If I look in my server logs, I should see one line corresponding with this hit. This is true for most browsers, but some browsers hit the server several times for every dynamically generated binary file. You can t predict how many hits a single request will generate; it could be two or three hits, or occasionally just one. If you want to avoid this multiple-hit problem, you can try setting the cache parameters like this:
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response.setHeader("Cache-control", "must-revalidate, post-check=0, pre-check=0");
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Another way to solve the multiple-hit problem is to embed the PDF in an HTML page using the embed tag.
Listing 9.4 embedded.html
<html> <body leftMargin="0" topMargin="0" scroll="No"> <embed src="/book/hello.pdf" width="100%" height="100%" type="application/pdf" fullscreen="yes" /> </body> </html>
If you skip to section 9.3, you ll also find an example of how to embed a PDF in an HTML page using the object tag. Using the tips and tricks summed up in this section, you should be able to tackle all the problems that can occur when writing a servlet that produces a PDF document. Writing a JSP page generating a PDF is another story.
Generating a PDF from a JSP page
It s a bad idea to use JSP to generate binary content. That s considered improper use of the technology. JSP wasn t created to produce images, PDF files, or any other binary file type. But that doesn t mean it s impossible. Go to http://itextpdf.org:8180/book/helloworld.jsp and you ll see a JSP page in action.
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