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Setting up a servlet environment |
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Servlets are Java programs that run on a Web server
and build Web pages. Here are a few definitions:
- Servlet Development Kits
Java Servlet Development Kit (JSDK) provides Servlet API classes (servlet.jar).
Place servlet.jar into CLASSPATH, so that java classes can access it.
- Servlet Engines
A servlet is a Java class that needs to be executed in a Java VM by
servlet engine. The servlet engine loads the servlet class the first time
the servlet is requested. The servlet then stays loaded to handle multiple
requests until it is explicitly unloaded or the servlet engine is shut down.
Following are few WebServers that supports servlets:
- Apache Tomcat
- BEA WebLogic
- IBM Websphere
- Sun's Java Web Server (JWS)
- Apache Tomcat.
- Java Servlet Development Kit (JSDK)
Apache Tomcat is a servlet container used for Java Servlet and
JavaServer Pages technologies.
Example below describes the development of servlet with Apache Tomcat.
Installation
Download Tomcat from http://jakarta.apache.org/tomcat/index.html and
follow the instruction for installation.
Compilation
Servlets are java classes they can be compiled with java compiler.
eg -javac myservlet.java.
Deployment
For deployment of servlet, it has to be placed in the specified directory
structure below:
- XML file describing servlet are placed in Webapps/WEB-INF/web.xml
- Servlet java classes are placed in Webapps/WEB-INF/classes
- External Library files like jdbc are placed in Webapps/WEB-INF/lib
Running Servlet
Open any browser and type http:\\localhost:8080\yourservlet.
Resources
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