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The below example will show you how to write a simple web based Hello World application using Spring MVC framework. Create a Dynamic Web Application in Eclipse IDE for our Spring Web Application.
Folder Structure
Required Files
- Index.jsp
- MVC_Controller.java
- web.xml
- SpringConfig-servlet.xml
- Welcome.jsp
Index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <a href="HelloWorld.html">Click here</a> </body> </html>
MVC_Contoller.java
package com.javainterviewpoint;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class MVC_Controller
{
@RequestMapping("/HelloWorld")
public ModelAndView Welcome()
{
String message = "Welcome to JavaInterviewPoint Spring 3 MVC Tutorial";
return new ModelAndView("Welcome","message",message);
}
}
Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee%20http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_ID" version="2.4">
<servlet>
<servlet-name>SpringConfig</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringConfig</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
SpringConfig-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> <context:component-scan base-package="com.javainterviewpoint"/> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/Jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
Welcome.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>${message}</h1>
</body>
</html>
How it works?
- Run our application (index.jsp) and click on the “Click here” link.
- Once you click on the link, controll will be passed to the DispatcherServlet mentioned in the web.xml
<servlet-name>SpringConfig</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
- Then the DispatcherServlet passes the controll to the MVC_Controller.java(@Controller) . As it is annotated with @Controller Annotation in SpringConfig-servlet.xml.
- The action “HelloWorld.html” be mapped in the controller, the controller verifies it under the @RequestMapping annotation.
- Now Welcome() method will be called, it simply returns the ModelAndView Object with the three parameter.
- 1st Parameter – View Name(Welcome)
- 2nd Parameter -Key to access the message
- 3rd Parameter – Value
return new ModelAndView("Welcome","message",message);- Through the ViewResolver (InternalResourceViewResolver) mapped in the SpringConfig-servlet.xml , the Welcome.jsp page will be resolved and rendered as the output.
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/Jsp/"></property> <property name="suffix" value=".jsp"></property> </bean>
Important Note:
In the web.xml we have given the servlet-name as “SpringConfig” , so our configuration name should be “SpringConfig-servlet.xml”, in general remember configuration name should be like this [ <<servlet-name in web.xml>>-servlet.xml]
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