Core Web Programming Chapter 19: Server-Side Java: Servlets

Chapter 19: Server-Side Java: Servlets

Source Code in This Chapter

Note: right-click or shift-click on the links to download the associated file. All code is freely available for unrestricted use. Note that most servlets (all except HelloWorld) are in the cwp package and thus need to be installed in the cwp subdirectory. Also, if you use Apache Tomcat, you might want to see Marty's guide to using Apache Tomcat.


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ServletTemplate.java Starting point for servlets.
HelloWorld.java Simple servlet that generates plain text.
HelloWWW.java Servlet that generates HTML. This and all remaining servlets are in the cwp package and therefore should be installed in the cwp subdirectory.
ServletUtilities.java Utility class that simplifies the output of the DOCTYPE and HEAD in servlets, among other things. Used by most remaining servlets in the chapter.
SimplerHelloWWW.java Servlet that uses ServletUtilities to simplify the generation of the DOCTYPE and HEAD part of the servlet.
ShowMessage.java Servlet that demonstrates the use of initialization parameters. Remember that, to use this servlet, you have to do three things:
- Put the modified web.xml file in the WEB-INF directory.
- Restart the server.
- Use the registered servlet name (i.e., the URL http://host/servlet/ShowMsg), not the raw servlet name (i.e., the URL http://host/servlet/cwp.ShowMessage).
Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.
web.xml The file needed by servlet 2.2 servers to run the ShowMessage servlet.
servlets.properties The file needed by the JSWDK 1.0.1 to run the ShowMessage servlet.
ThreeParams.java Servlet that reads and displays three request (form) parameters. Uses the ServletUtilities class.
ThreeParamsForm.html HTML form that sets the parameters that the ThreeParams servlet expects. Remember that HTML files are installed in a different location (e.g., the directory above WEB-INF) than are servlet classes.
ServletUtilities.java Utility class that, among other things, contains the static filter method that replaces special HTML characters with their HTML character entities.
ShowRequestHeaders.java Servlet that shows all request headers sent by browser in current request.
EncodedPage.java Servlet that shows the bandwidth benefits of gzipping pages to browsers that can handle gzip. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.
SearchEngines.java Servlet that redirects requests to various search engines. Uses the SearchSpec helper class. Accessed by means of SearchEngines.html.
PrimeNumbers.java Servlet that processes a request to generate n prime numbers, each with at least m digits. If these results are not complete, it sends a Refresh header instructing the browser to ask for new results a little while later. Uses the Primes, PrimeList, and ServletUtilities classes. Accessed by means of PrimeNumbers.html.
SetCookies.java Servlet that sets a few persistent and session cookies. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.
ShowCookies.java Servlet that displays all cookies that arrived in current request. Uses the ServletUtilities class.
ServletUtilities.java Utility class that, among other things, contains the static getCookieValue and getCookie methods. HTML character entities.
LongLivedCookie.java Subclass of Cookie that automatically sets the max age to one year.
ShowSession.java Servlet that uses session tracking to determine if the client is a repeat visitor. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.

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