Spring 3 MVC hello world example

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in this tutorial, we show you how to develop a Spring 3 MVC hello world example.

Technologies used :

Spring 3.0.5.RELEASE
JDK 1.6
Maven 3
Eclipse 3.6
1. Project Dependency
In Spring 3 @MVC, declares following dependencies in your Maven pom.xml file.

<properties>
<spring.version>3.0.5.RELEASE</spring.version>
</properties>

<dependencies>


<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>

</dependencies>

</project>
2. Controller & Mapping
In Spring 3, annotation is widely adapted in everywhere. The @RequestMapping is available since 2.5, but now enhanced to support REST style URLs in Spring MVC.

package com.mkyong.common.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/welcome")
public class HelloController {

@RequestMapping(method = RequestMethod.GET)
public String printWelcome(ModelMap model) {

model.addAttribute("message", "Spring 3 MVC Hello World");
return "hello";

}

}
3. JSP Views
A JSP page to display the value.

File : hello.jsp

<html>
<body>
<h1>Message : ${message}</h1>
</body>
</html>
4. Spring Configuration
In Spring 3, you still need to enable “auto component scanning” (for controller) and declares “view resolver” manually.

File : mvc-dispatcher-servlet.xml

<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"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<context:component-scan base-package="com.mkyong.common.controller" />

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

</beans>
5. Integrate Web application with Spring
Integration is no different if compare with old Spring 2.5.6, just declares Spring “ContextLoaderListener” and “DispatcherServlet“.

File : web.xml

<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>Spring MVC Application</display-name>

<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</context-param>

<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>

</web-app>
6. Demo
URL : http://localhost:8080/SpringMVC/welcome

spring 3 mvc demo

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