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Gradle – Spring 4 MVC Hello World Example

2015-08-24 16:17 525 查看

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[/code] 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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