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The Methods Defined by Cookie
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Here, the name and value of the cookie are supplied as arguments to the constructor The methods of the Cookie class are summarized in Table 6-8
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The Servlet Life Cycle
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All servlets have the same life cycle, which is governed by three methods defined by the Servlet interface These are init( ), service( ), and destroy( ) The life cycle begins when the server invokes the init( ) method This occurs when the servlet is first loaded into memory Thus, init( ) is executed only once It is passed a reference to a ServletConfig object, which is used to pass parameters to the servlet After the servlet has been initialized, the server invokes the service( ) method to process a request The servlet can read data that has been provided in the request through the ServletRequest parameter It may also formulate a response for the client, using the ServletResponse parameter The service( ) method is called for each request (For HttpServlet, service( ) invokes one of the do methods to handle the request) The servlet remains in the server s address space and is available to process any other requests received from clients until it is terminated by the server When the servlet is no longer needed, the server can remove the servlet from its memory and release any resources used by the servlet by calling the destroy( ) method No calls to service( ) will be made after destroy( ) has been called
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To create servlets, you will need access to a servlet development environment As mentioned earlier, the one used in this chapter is Tomcat Tomcat is an open-source product maintained by the Jakarta Project of the Apache Software Foundation Although Tomcat is easy to use, especially if you are an experienced Web developer who is using a high-quality development tool, it is still useful to walk through the procedure The instructions given here assume that you are using only the JDK and Tomcat No integrated development environment or tool is assumed The instructions for using Tomcat presented here assume a Windows environment In this environment, the default location for Tomcat 6010 is
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C:\apache-tomcat-6010
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This is the location assumed by the recipes in this book If you load Tomcat in a different location, or use a different version, you will need to make appropriate changes You may need to set the environmental variable JAVA_HOME to the top-level directory in which the Java Development Kit is installed For JDK 6, the default directory is
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C:\Program Files\Java\JDK160
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but you will need to confirm this for your environment To start Tomcat, run startupbat from
C:\apache-tomcat-6010\bin\
When you are done testing servlets, stop Tomcat by running shutdownbat The directory
C:\apache-tomcat-6010\lib\
contains servlet-apijar This JAR file contains the classes and interfaces that are needed to build servlets To make this file accessible, update your CLASSPATH environment variable so that it includes
C:\apache-tomcat-6010\lib\servlet-apijar
Alternatively, you can specify this class file when you compile the servlets For example, the following command compiles the first servlet example:
javac ServletSkeljava -classpath "C:\apache-tomcat-6010\lib\servlet-apijar"
Once you have compiled a servlet, you must enable Tomcat to find it This means putting it into a directory under Tomcat s webapps directory and entering its name into a webxml file To keep things simple, the examples in this chapter use the directory and webxml file that Tomcat supplies for its own example servlets Here is the procedure that you will follow First, copy the servlet s class file into the following directory:
C:\apache-tomcat-6010\webapps\examples\WEB-INF\classes
6:
Applets and Servlets
Next, add the servlet s name and mapping to the webxml file in the following directory:
C:\apache-tomcat6010\webapps\examples\WEB-INF
For instance, assuming the first example, called ServletSkel, you will add the following lines in the section that defines the servlets:
<servlet> <servlet-name>ServletSkel</servlet-name> <servlet-class>ServletSkel</servlet-class> </servlet>
Next, you will add the following lines to the section that defines the servlet mappings:
<servlet-mapping> <servlet-name>ServletSkel</servlet-name> <url-pattern>/servlet/ServletSkel</url-pattern> </servlet-mapping>
Follow this same general procedure for all of the servlet recipes Once you have compiled your servlet, copied its class file to the proper directory, and updated the webxml file as just described, you can test it by using your browser For example, to test ServletSkel, start the browser and then enter the URL shown here:
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