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Spring 3 MVC hello world example

2015-03-18 14:36 411 查看

Before you start this Spring 3 MVC tutorial, please refer to this
new features in Spring 3 documentation, so that you have a brief idea of what’s new in Spring 3.

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>
 
<!-- 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 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

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标签： java spring spring mvc spirng mv

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