Hello World, Java/Spring

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Hello World, Java/Spring

7kb zipped example: 

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

Technologies used :

  1. Spring 3.0.5.RELEASE
  2. JDK 1.6
  3. Maven 3
  4. 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>
 
		<!-- Spring 3 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 tosupport 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

output: 

Message: Spring 3 MVC Hello World
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