Chapter 2: First Servlets

Source Code in This Chapter

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• ServletTemplate.java Outline of a simple non-packaged servlet.
• HelloWorld.java Servlet that generates plain text.
• HelloWWW.java Servlet that generates HTML.
• HelloWWW2.java Servlet in package.
• ServletUtilities.java Servlet utility library used throughout book.
• HelloWWW3.java Variation of HelloWWW2 that uses the ServletUtilities class for the HEAD section. Don't forget that your CLASSPATH has to point to the top of your package hierarchy as described on page 29. Otherwise you get an "unresolved symbol: ServletUtilities" error message when compiling HelloWWW3.java. Note that this is just the general Java approach to using classes in packages, not anything servlet-specific.
• ShowMessage.java Servlet that reads initialization parameters. Uses a few small utility methods from ServletUtilities. Note that, in order to get the initialization parameters to work, you have to run this from the registered name (set up in server-specific manner) as described on pages 41-43. Also see the note above re HelloWWW3 about remembering to follow the book's instructions (page 29, etc.) about compiling classes that are in packages.
• tomcat-3.0-web.xml File for setting initialization parameters with Tomcat 3.0. Install as install_dir/webpages/WEB-INF/web.xml. In Tomcat 3.1, it would go in install_dir/webapps/ROOT/WEB-INF/web.xml.
• jswdk-1.01-servlets.properties File for setting initialization parameters with the JSWDK 1.0.1. Install as install_dir/webpages/WEB-INF/servlets.properties.
• LotteryNumbers.java A servlet that uses initialization parameters and page modification dates. Uses a few small utility methods from ServletUtilities.
• WebClient.java Top-level class for program to talk interactively to Web servers. Requires the components listed below.
  • HttpClient.java
  • NetworkClient.java
  • SocketUtil.java
  • CloseableFrame.java
  • LabeledTextField.java
  • Interruptible.java
• New: installation and configuration information for Tomcat 3.1. The final release of Tomcat 3.1 came out after the book went to print. So, this separate page gives a summary of how to install and set it up.
• servletc-tomcat.bat Windows batch file that I use instead of javac when compiling/installing servlets in the coreservlets package for Tomcat 3.0. I store it in somewhere in the system PATH and call it servletc.bat. Use this as an example only, since it incorporates my specific directory settings.
• servletc-jswdk.bat Windows batch file that I use instead of javac when compiling/installing servlets in the coreservlets package for the JSWDK 1.0.1. I store it in somewhere in the system PATH and call it servletc.bat. Use this as an example only, since it incorporates my specific directory settings.
• servletc-jws.bat Windows batch file that I use instead of javac when compiling/installing servlets in the coreservlets package for Java Web Server 2.0. I store it in somewhere in the system PATH and call it servletc.bat. Use this as an example only, since it incorporates my specific directory settings.

URLs in This Chapter

• HTML validator from the WWW Consortium.
• HTML validator from the Web Design Group.

General

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