Chapter 7: Generating the Server Response: HTTP Response Headers

Source Code in This Chapter

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• PrimeNumbers.java A servlet that generates a list of large prime numbers. It sends an initial list to browser and instructs browser to reconnect periodically for updated results until list is complete. Uses the following auxiliary classes:
  • PrimeList.java Creates a Vector of large prime numbers, usually in a low-priority background thread. Provides a few small thread-safe access methods.
  • Primes.java Generates random BigIntegers and finds first prime ones above a given starting point.
  • ServletUtilities.java Provides a few simple HTML-generation utilities.
• PrimeNumbers.html Front end to PrimeNumbers servlet.
• PersistentConnection.java A servlet that makes use of persistent (keep-alive) HTTP connections if associated server supports them.
• ImageRetriever.java A servlet that reads GIF files off local system. Used only to illustrate benefit of persistent HTTP connections; you should not install this servlet permanently on a public server since it can return image files outside Web server hierarchy.
• ShadowedText.java A servlet acting as a GIF-generation service. Servlet uses Java 2D to generated shadowed messages, returning them as GIF files that the client assumedly saves permanently to disk for later use in a Web page. Uses the MessageImage and GifEncoder classes.
• MessageImage.java Class that does the actual Java 2D drawing.
• ShadowedText.html Front end to ShadowedText servlet.
• ShadowedTextFrame.java Interactive interface to the MessageImage class.
• ExitListener.java WindowListener for ShadowedTextFrame.java.
• ServletUtilities.java Small utility library used by most servlets in this chapter.

URLs in This Chapter

• Registered MIME types
• Common unregistered MIME types
• Jef Poskanzer's Java classes (home of the GifEncoder)
• http://www.rfc-editor.org/. Starting place when looking for on-line RFCs. RFCs mentioned in this chapter:
  • RFC 2616: Specifies HTTP 1.1
  • RFC 1766: Defines language codes
  • RFC 1864: Describes MD5 digests
  • RFCs 1521 and 1522: Lists some common MIME types

General

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