Spring – Web Container | Code Factory

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• WebApplicationContext is the child of plain ApplicationContext. It is used in web applications. It provides features to deal with web-related components like- controllers, view resolvers etc.

public interface WebApplicationContext extends ApplicationContext

• A Web Application can have multiple WebApplicationContext to handle requests.
• Each DispatcherServlet is associated with one WebApplicationContext.

Create Web Project

• Open Eclipse
• Go to File -> New -> Dynamic Web Project
• Create IOC-Web project
• Right click on project -> Build Path -> Configure Build Path -> Libraries tab -> Add External JARs (Used 2.X jars)
  • commons-logging-X.X.jar
  • spring-beans-X.X.X.jar
  • spring-context-X.X.X.jar
  • spring-core-X.X.X.jar
  • spring-web-X.X.X.jar
  • spring-webmvc-X.X.X.jar
• Also add these jars into WEB-INF/lib folder
• * You can find dtd information from spring-beans-X.X.X.jar -> org -> springframework -> beans -> factory -> xml -> spring-beans.dtd (line no 36 & 37)

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
		http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
	
	<display-name>IOC-Web</display-name>
	
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	
	<servlet>
		<servlet-name>helloWorld</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	</servlet>
	
	<!-- listener class -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	
	<!-- context param -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/helloWorld-servlet.xml</param-value>
	</context-param>
	
	<servlet-mapping>
		<servlet-name>helloWorld</servlet-name>
		<url-pattern>*.code</url-pattern>
	</servlet-mapping>

</web-app>

helloWorld-servlet.java

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
	"http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>
	<!-- default handler mapping -->
	<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />

	<!-- controller -->
	<bean name="/hello.code" class="com.codeFactory.controller.HelloController" />

	<!-- view resolver -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/" />
		<property name="suffix" value=".jsp" />
	</bean>

	<bean id="t" class="com.codeFactory.beans.Test" scope="prototype" />
	
</beans>

Test.java

package com.codeFactory.beans;

/**
 * @author code.factory
 *
 */
public class Test {
	private Test() {
		System.out.println("Test.Test()");
	}
	
	public void print(String msg) {
		System.out.println(msg);
	}
}

HelloController.java

package com.codeFactory.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

import com.codeFactory.beans.Test;

public class HelloController extends AbstractController {

	@Override
	protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
		String name = request.getParameter("name");
		
		WebApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
		
		/* get bean object */
		Test t = (Test) context.getBean("t");
		t.print(name);
		
		ModelAndView modelAndView = new ModelAndView("success", "msg", name);
		return modelAndView;
	}

}

index.jsp

<h2>Hello World</h2>
<form action="./hello.code">
	Name: <input type="text" name="name">
	<input type="submit" value="Submit">
</form>

success.jsp

<p>Hello ${msg}</p>

Run Project:

• Right click on project -> Run As -> Run As Server

Hit http://localhost:8080/IOC-Web/

• Insert value and click on Submit and also check console.

Test.Test()
Code Factory