How to Write Deployment Descriptor,web.xml In Servlet

This web.xml is like index of book, web.xml is containing details of static web resource programs and dynamic web resource programs.  The purpose of web.xml is to hide [or] to achieve the security for the web application by not showing [ in the URL ] the type of technology used for development of web application.

Deployment Descriptor [ web.xml ] in Servlets

Syntax

<web-app>
 <servlet>
    <servlet-name> Give Some Dummy Name </servlet-name>
    <servlet-class>/Flly qualified name of our servlet</servlet-class>
 </servlet>
 <servlet-mapping>
    <servlet-name> Give Some Dummy Name </servlet-name>
    <url-pattern>/UserFriendlyName</url-pattern>
 </servlet-mapping>
</web-app>

• We must call our servlet by typing its <url-pattern> only
• For example http://localhost:8080/OurServletApplicationFolderName/UserFriendlyName
• Once we call our servlet just like above, then the server will first loads web.xml and verifies whether the url pattern we are calling is same as what in <url-pattern> tag in web.xml [Line number 8] or not
• If matched, it will checks the <servlet-name> [Line number 7] and will jump to <servlet-name> [Line number 3] in <servlet> tag and, will check whether the value of <servlet-name> in line number 3 & line number 7 are same or not if same it will load our class in <servlet-class> [line number 4]
• Finally our .class file will be executed, so we can check the output

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::. About the Author .::
		Sivateja Kandula - Java/J2EE Full Stack Developer Founder of Java4s - Get It Yourself, A popular Java/J2EE Programming Blog, Love Java and UI frameworks. You can sign-up for the Email Newsletter for your daily dose of Java tutorials.