Tutorial 6 WebXML

Description

You can find in this video tutorial. * What is deployment descriptor file? * How to define dispatcher servlet? * How to set URL mapping for dispatcher servlet?

WebXML

It is a configuration file for web application in java. It instructs the servlet container (Tomcat) which class to load.

<web-app id="WebApp_ID" version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 
    <display-name>Archetype Created Web Application</display-name>
 
    <context-param>
        <param-name>ApplicationContext</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
 
    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
 
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
 
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
 
    <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>
 
</web-app>

Things can be defined in WebXML

Filters could be defined in it.
Welcome file list could be defined in it.
Error pages could be defined in it.

Some of the child elements element,

Init-param: It is a static parameter, which is defined within servlet tag.It is a servlet level scope. At the servlet level you can get value of this.
Context-param: It is a static parameter, which is defined in web.xml file. It is an application level scope parameter. If the data does not change frequently you can store in it.
Servlet: The servlet element contains the declarative data of a servlet.
Servlet-Mapping: The servlet-mapping element defines a mapping between a servlet and a URL pattern.
Listener: The Listener element defines an event of the web application.

Tutorial 6 WebXML

WebXML

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