Web.xml is a deployment descriptor file. Simply speaking, see web.xml as a file used to describe classes, resources and configurations which is used by web server to serve the requests. As the request reaches to the web server, the server uses web.xml to map the URL of the request to the code that would handle the request.
While working with Spring MVC, the server, in turn, delegates the request to DispatcherServlet which retrieves appropriate controller that would be used to handle the request and serve the request using the view. The view (jsp file) is decided by DispatcherServlet using the ViewResolver.
Thus, web.xml would need to have configuration related with DispatcherServlet. Following is the sample code:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- Spring Configuration --> <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/spring-servlet.xml </param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> </web-app>
The spring related configuration, as per Spring MVC convention, is stored in the file named using -servlet.xml where ServletName is the name of DispatcherServlet defined in web.xml file. In above web.xml file, the servlet name of DispatcherServlet is “spring” and thus, the name “spring-servlet.xml”. The spring-servlet file consists of information related with components such as controller and POJOs along with hibernate related configuration which are used to serve the request.
Following is the simplistic code for spring-servlet.xml. Pay attention to the following code
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd"> <context:component-scan base-package="com.vitalflux.helloworld" /> <!-- Configuration defining views files --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"> <value>/WEB-INF/views/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean> </beans>
Last updated: 28th April, 2024 In this post, you will learn the concepts related to…
Last updated: 26th April, 2024 In this blog post, we will discuss the logistic regression…
Last updated: 22nd April, 2024 As data scientists, we navigate a sea of metrics to…
Last updated: 22nd April, 2024 This post will teach you about the gradient descent algorithm…
Last updated: 19th April, 2024 Among the terminologies used in training machine learning models, the…
Last updated: 19th April, 2024 Model parallelism and data parallelism are two strategies used to…