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Spring 3 MVC hello world example

2015-09-22 16:53 465 查看
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 :



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;

@Controller
public 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



URL : http://localhost:8080/spring3/hello/mkyong



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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