Spring 3 MVC hello world example

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In this tutorial, we show you a Spring 3 MVC hello world example, using Maven build tool.

Technologies used :

Spring 3.2.13.RELEASE
Maven 3
JDK 1.6
Eclipse 4.4
Boostrap 3

1. Project Structure

Download the project source code and review the project folder structure :
spring3-mvc-maven-project

2. Maven

A pom.xml template to quick start a Spring MVC project, it defines Spring 3 dependencies, an embedded Jetty container and Eclipse workspace configuration.

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0     http://maven.apache.org/maven-v4_0_0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.mkyong</groupId>    <artifactId>spring3-web</artifactId>    <packaging>war</packaging>    <version>1.0-SNAPSHOT</version>    <name>spring css</name>    <properties>        <jdk.version>1.6</jdk.version>        <spring.version>3.2.13.RELEASE</spring.version>        <jstl.version>1.2</jstl.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>jstl</artifactId>            <version>${jstl.version}</version>        </dependency>    </dependencies>    <build>      <plugins>        <plugin>            <groupId>org.apache.maven.plugins</groupId>            <artifactId>maven-compiler-plugin</artifactId>            <version>3.3</version>            <configuration>                <source>${jdk.version}</source>                <target>${jdk.version}</target>            </configuration>        </plugin>        <!-- embedded Jetty server, for testing -->        <plugin>            <groupId>org.eclipse.jetty</groupId>            <artifactId>jetty-maven-plugin</artifactId>            <version>9.2.11.v20150529</version>            <configuration>                <scanIntervalSeconds>10</scanIntervalSeconds>                <webApp>                    <contextPath>/spring3</contextPath>                </webApp>            </configuration>        </plugin>        <!-- configure Eclipse workspace -->         <plugin>            <groupId>org.apache.maven.plugins</groupId>            <artifactId>maven-eclipse-plugin</artifactId>            <version>2.9</version>            <configuration>                <downloadSources>true</downloadSources>                <downloadJavadocs>true</downloadJavadocs>                <wtpversion>2.0</wtpversion>                <wtpContextName>spring3</wtpContextName>            </configuration>        </plugin>      </plugins>    </build>  </project>

3. Controller & Mapping

The @RequestMapping has been available since 2.5, but now enhanced to support REST style URLs.

HelloController.java

package com.mkyong.web.controller;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class HelloController {    @RequestMapping(value = "/", method = RequestMethod.GET)    public String printWelcome(ModelMap model) {        model.addAttribute("message", "Spring 3 MVC Hello World");        return "hello";    }    @RequestMapping(value = "/hello/{name:.+}", method = RequestMethod.GET)    public ModelAndView hello(@PathVariable("name") String name) {        ModelAndView model = new ModelAndView();        model.setViewName("hello");        model.addObject("msg", name);        return model;    }}

4. JSP Views

A JSP page to display the value, and include bootstrap css and js.

html4strict

<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!DOCTYPE html><html lang="en"><head><spring:url value="/resources/core/css/hello.css" var="coreCss" /><spring:url value="/resources/core/css/bootstrap.min.css" var="bootstrapCss" /><link href="${bootstrapCss}" rel="stylesheet" /><link href="${coreCss}" rel="stylesheet" /></head><nav class="navbar navbar-inverse navbar-fixed-top">  <div class="container">    <div class="navbar-header">        <a class="navbar-brand" href="#">Spring 3 MVC Project</a>    </div>  </div></nav><div class="jumbotron">  <div class="container">    <h1>${title}</h1>    <p>        <c:if test="${not empty name}">            Hello ${name}        </c:if>        <c:if test="${empty name}">            Welcome Welcome!        </c:if>    </p>    <p>    <a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>    </p>  </div></div><div class="container">  <div class="row">    <div class="col-md-4">        <h2>Heading</h2>        <p>ABC</p>        <p>        <a class="btn btn-default" href="#" role="button">View details</a>        </p>    </div>    <div class="col-md-4">        <h2>Heading</h2>        <p>ABC</p>        <p>        <a class="btn btn-default" href="#" role="button">View details</a>        </p>    </div>    <div class="col-md-4">        <h2>Heading</h2>        <p>ABC</p>        <p>        <a class="btn btn-default" href="#" role="button">View details</a>        </p>    </div>  </div>  <hr />  <footer>    <p>© Mkyong.com 2015</p>  </footer></div><spring:url value="/resources/core/css/hello.js" var="coreJs" /><spring:url value="/resources/core/css/bootstrap.min.js" var="bootstrapJs" /><script src="${coreJs}"></script><script src="${bootstrapJs}"></script><script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script></body></html>

5. Spring XML Configuration

5.1 Enable component scanning, view resolver and resource mapping.

spring-web-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"    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/mvc         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd        http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.2.xsd">    <context:component-scan base-package="com.mkyong.web" />    <bean        class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix">            <value>/WEB-INF/views/jsp/</value>        </property>        <property name="suffix">            <value>.jsp</value>        </property>    </bean>    <mvc:resources mapping="/resources/**" location="/resources/" />    <mvc:annotation-driven /></beans>

5.2 Declares a `DispatcherServlet` in `web.xml`. If the Spring XML configuration file is NOT specified, Spring will look for the `{servlet-name}-servlet.xml`.

In this example, Spring will look for the spring-web-servlet.xml file.

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"    version="2.5">    <display-name>Spring3 MVC Application</display-name>    <servlet>        <servlet-name>spring-web</servlet-name>        <servlet-class>                    org.springframework.web.servlet.DispatcherServlet                </servlet-class>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>spring-web</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping></web-app>

You can define a Spring XML file via contextConfigLocation.

web.xml

    <servlet>        <servlet-name>spring-web</servlet-name>        <servlet-class>                     org.springframework.web.servlet.DispatcherServlet                </servlet-class>        <load-on-startup>1</load-on-startup>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>/WEB-INF/spring-mvc-config.xml</param-value>        </init-param>    </servlet>        <servlet-mapping>        <servlet-name>spring-web</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>

6. Demo

The pom.xml file defines an embedded Jetty container. Issues mvn jetty:run to start the project.
Terminal

$ mvn jetty:run...[INFO] Started Jetty Server[INFO] Starting scanner at interval of 10 seconds.

URL : http://localhost:8080/spring3
spring3-mvc-maven-xml-demo

URL : http://localhost:8080/spring3/hello/mkyong
spring3-mvc-maven-xml-demo2

7. WAR File

To create a WAR file for deployment :
Terminal

your-project$ mvn war:war

A WAR file will be created in project\target\ folder.

${Project}\target\spring3-web-1.0-SNAPSHOT.war

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Spring 3 MVC hello world example

1. Project Structure

2. Maven

pom.xml

3. Controller & Mapping

HelloController.java

4. JSP Views

html4strict

5. Spring XML Configuration

5.1 Enable component scanning, view resolver and resource mapping.

spring-web-servlet.xml

5.2 Declares a DispatcherServlet in web.xml. If the Spring XML configuration file is NOT specified, Spring will look for the {servlet-name}-servlet.xml.

web.xml

web.xml

6. Demo

7. WAR File

5.2 Declares a `DispatcherServlet` in `web.xml`. If the Spring XML configuration file is NOT specified, Spring will look for the `{servlet-name}-servlet.xml`.