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Next: Generic Servlet Example Up: Lecture 13 Previous: Servlets under Java Web Server

Servlet Interface

All servlets implement javax.servlet.Servlet interface

init(ServletConfig)initialize servlet once on loading
service()invoke servlet
getServletConfig()get servlet configuration - passed to init()
destroy()terminate servlet

Wee.java uses GenericServlet implementation of this interface.

When first loaded Wee class

Each time Wee's service method is run, it

On termination Wee.java saves current value of count in file.

Loaded servlets are terminated when servlets engine is terminated.

This example can be built on anubis as follows:

anubis% TOMCAT_HOME=/var/lib/tomcat6/webapps
anubis% cp Wee.java $TOMCAT_HOME/demo/WEB-INF/classes
anubis% CLASSPATH=".:/usr/share/java/servlet.jar"
anubis% export CLASSPATH
anubis% cd $TOMCAT_HOME/demo/WEB-INF/classes
anubis% javac Wee.java

Declare servlet in $TOMCAT_HOME/demo/WEB-INF/web.xml with

 <servlet>
   <servlet-name>Wee</servlet-name><servlet-class>Wee</servlet-class>
 </servlet>
 <servlet-mapping>
   <servlet-name>Wee</servlet-name><url-pattern>/Wee</url-pattern>
 </servlet-mapping>
Lecture 13XHTML 1.0Slide 6