In this tutorial, we will show you a Gradle + Spring 4 MVC, Hello World Example (JSP view), XML configuration.

Technologies used :

  • Gradle 2.0
  • Spring 4.1.6.RELEASE
  • Eclipse 4.4
  • JDK 1.7
  • Logback 1.1.3
  • Boostrap 3

1. Project Structure

Download the project source code and review the project folder structure :

2. Gradle Build

2.1 Review the build.gradle file, this should be self-explanatory.

build.gradle

apply plugin: 'java'

apply plugin: 'war'

apply plugin: 'eclipse-wtp'

apply plugin: 'jetty'

// JDK 7

sourceCompatibility = 1.7

targetCompatibility = 1.7

repositories {

    mavenLocal()

    mavenCentral()

}

dependencies {

	compile 'ch.qos.logback:logback-classic:1.1.3'

	compile 'org.springframework:spring-webmvc:4.1.6.RELEASE'

	compile 'javax.servlet:jstl:1.2'

}

// Embeded Jetty for testing

jettyRun{

	contextPath = "spring4"

	httpPort = 8080

}

jettyRunWar{

	contextPath = "spring4"

	httpPort = 8080

}

//For Eclipse IDE only

eclipse {

  wtp {

    component {

      //define context path, default to project folder name

      contextPath = 'spring4'

    }

  }

}

2.2 To make this project supports Eclipse IDE, issues gradle eclipse :

your-project$ gradle eclipse

3. Spring MVC

Spring MVC related stuff.

3.1 Spring Controller – @Controller and @RequestMapping.

WelcomeController.java

package com.mkyong.helloworld.web;

import java.util.Map;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

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;

import com.mkyong.helloworld.service.HelloWorldService;

@Controller

public class WelcomeController {

	private final Logger logger = LoggerFactory.getLogger(WelcomeController.class);

	private final HelloWorldService helloWorldService;

	@Autowired

	public WelcomeController(HelloWorldService helloWorldService) {

		this.helloWorldService = helloWorldService;

	}

	@RequestMapping(value = "/", method = RequestMethod.GET)

	public String index(Map<String, Object> model) {

		logger.debug("index() is executed!");

		model.put("title", helloWorldService.getTitle(""));

		model.put("msg", helloWorldService.getDesc());

		return "index";

	}

	@RequestMapping(value = "/hello/{name:.+}", method = RequestMethod.GET)

	public ModelAndView hello(@PathVariable("name") String name) {

		logger.debug("hello() is executed - $name {}", name);

		ModelAndView model = new ModelAndView();

		model.setViewName("index");

		model.addObject("title", helloWorldService.getTitle(name));

		model.addObject("msg", helloWorldService.getDesc());

		return model;

	}

}

3.2 A service to generate a message.

HelloWorldService.java

package com.mkyong.helloworld.service;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Service;

import org.springframework.util.StringUtils;

@Service

public class HelloWorldService {

	private static final Logger logger = LoggerFactory.getLogger(HelloWorldService.class);

	public String getDesc() {

		logger.debug("getDesc() is executed!");

		return "Gradle + Spring MVC Hello World Example";

	}

	public String getTitle(String name) {

		logger.debug("getTitle() is executed! $name : {}", name);

		if(StringUtils.isEmpty(name)){

			return "Hello World";

		}else{

			return "Hello " + name;

		}

	}

}

3.3 Views – JSP + JSTL + bootstrap. A simple JSP page to display the model, and includes the static resources like css and js.

/WEB-INF/views/jsp/index.jsp

<%@ 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="#">Project Name</a>

	</div>

  </div>

</nav>

<div class="jumbotron">

  <div class="container">

	<h1>${title}</h1>

	<p>

		<c:if test="${not empty msg}">

			Hello ${msg}

		</c:if>

		<c:if test="${empty msg}">

			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>

3.4 Logging – Send all logs to console.

logback.xml

<?xml version="1.0" encoding="UTF-8"?>

<configuration>

	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">

	  <layout class="ch.qos.logback.classic.PatternLayout">

		<Pattern>

		%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n

		</Pattern>

	  </layout>

	</appender>

	<logger name="org.springframework" level="debug"

                additivity="false">

		<appender-ref ref="STDOUT" />

	</logger>

	<logger name="com.mkyong.helloworld" level="debug"

                additivity="false">

		<appender-ref ref="STDOUT" />

	</logger>

	<root level="debug">

		<appender-ref ref="STDOUT" />

	</root>

</configuration>

4. Spring XML Configuration

Spring XML configuration files.

4.1 Spring root context.

spring-core-config.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.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd ">

	<context:component-scan base-package="com.mkyong.helloworld.service" />

</beans>

4.2 Spring web or servlet context.

spring-web-config.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.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd ">

	<context:component-scan base-package="com.mkyong.helloworld.web" />

	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>

		<property name="prefix" value="/WEB-INF/views/jsp/" />

		<property name="suffix" value=".jsp" />

	</bean>

	<mvc:resources mapping="/resources/**" location="/resources/" />

	<mvc:annotation-driven />

</beans>

4.3 Classic web.xml

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>Gradle + Spring MVC Hello World + XML</display-name>

	<description>Spring MVC web application</description>

	<!-- For web context -->

	<servlet>

		<servlet-name>hello-dispatcher</servlet-name>

		<servlet-class>

                        org.springframework.web.servlet.DispatcherServlet

                </servlet-class>

		<init-param>

			<param-name>contextConfigLocation</param-name>

			<param-value>/WEB-INF/spring-mvc-config.xml</param-value>

		</init-param>

		<load-on-startup>1</load-on-startup>

	</servlet>

	<servlet-mapping>

		<servlet-name>hello-dispatcher</servlet-name>

		<url-pattern>/</url-pattern>

	</servlet-mapping>

	<!-- For root context -->

	<listener>

		<listener-class>

                  org.springframework.web.context.ContextLoaderListener

                </listener-class>

	</listener>

	<context-param>

		<param-name>contextConfigLocation</param-name>

		<param-value>/WEB-INF/spring-core-config.xml</param-value>

	</context-param>

</web-app>

5. Demo

5.1 The gradle.build file is defined an embedded Jetty container. Issues gradle jettyRun to start the project.

Terminal

your-project$ gradle jettyRun

:compileJava

:processResources

:classes

:jettyRun

//...SLF4j logging

> Building 75% > :jettyRun > Running at http://localhost:8080/spring4

5.2 http://localhost:8080/spring4/

5.3 http://localhost:8080/spring4/hello/mkyong.com

6. WAR File

To create a WAR file for deployment :

Terminal

your-project$ gradle war

A WAR file will be created in project\build\libs folder.

${Project}\build\libs\spring-web-gradle-xml.war

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