This guide will help you create a simple web application with Spring Boot. We will add the dependencies for Bootstrap and jQuery webjars. We will create a simple jsp view using jQuery and Bootstrap.
You will learn
- How to bootstrap a simple project with Spring Initializr?
- How to initialize a basic web application for Spring Boot?
- How to add a JSP for web application?
- How to add webjars for jQuery and Bootstrap?
- How to create a simple view using jQuery and Bootstrap?
Tools you will need
- Maven 3.0+ is your build tool
- Your favorite IDE. We use Eclipse.
- JDK 1.8+
Overview of the Web application
We will build a static todo page (un-formatted) rendered using a jsp.
Files
Following screenshot shows eclipse project with all the files we would create.
A brief overview of all files
SpringBootWebApplicationBootstrapJqueryApplication.java- Spring Boot Application class. This initialized the Spring Boot application with auto configuration.WelcomeController.java- A Controller with a method to redirect to the view - jsp.- welcome.jsp - The view - uses Jquery and Bootstrap.
pom.xml- We will add the webjar dependencies for Bootstrap and jQuery to pom.xml.application.properties- This is typically used to configure frameworks in Spring Boot. In this example, we would configure our view resolver in application.properties.
Complete project on Github : https://github.com/in28minutes/spring-boot-examples/tree/master/spring-boot-web-application-bootstrap-jquery
Bootstrapping web application with Spring Initializr
Creating a Web application with Spring Initializr is a cake walk.
Spring Initializr http://start.spring.io/ is great tool to bootstrap your Spring Boot projects.
As shown in the image above, following steps have to be done
- Launch Spring Initializr and choose the following
- Choose
com.in28minutes.springboot.web.applicationas Group - Choose
spring-boot-web-application-bootstrap-jqueryas Artifact - Choose following dependencies
- Web
- Actuator
- DevTools
- Choose
- Click Generate Project.
- Import the project into Eclipse.
- If you want to understand all the files that are part of this project, you can go here.
Project Dependencies
Spring Boot Starter Web provides all the dependencies and the auto configuration need to develop web applications. It is the first dependency we would use.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
We want to use JSP as the view. Default embedded servlet container for Spring Boot Starter Web is tomcat. To enable support for JSP’s, we would need to add a dependency on tomcat-embed-jasper.
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
Configuring a View Resolver
We would have our jsp’s in /WEB-INF/jsp/. We would need to configure the view resolver with the prefix and suffix.
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
Controller
Lets add in a simple controller redirecting to the view.
/src/main/java/com/in28minutes/springboot/tutorial/basics/application/configuration/WelcomeController.java
@Controller
public class WelcomeController {
@RequestMapping("/welcome")
public String loginMessage(){
return "welcome";
}
}
The url to this controlle method will be http://localhost:8080/welcome
Adding a view
Let’s create a simple with a basic HTML structure. We will create a basic table which we would want to format a little later.
/src/main/webapp/WEB-INF/jsp/welcome.jsp
<html>
<head>
<title>Welcome</title>
</head>
<body>
<div class="container">
<table class="table table-striped">
<caption>Your todos are</caption>
<thead>
<tr>
<th>Description</th>
<th>Target Date</th>
<th>Is it Done?</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
<tr>
<td>Todo 1</td>
<td>10/12/2017</td>
<td>No</td>
<td><a class="btn btn-warning" href="/edit-todo">Edit Todo</a></td>
<td><a class="btn btn-warning" href="/delete-todo">Delete Todo</a></td>
</tr>
</tbody>
</table>
<div>
<a class="btn btn-default" href="/add-todo">Add a Todo</a>
</div>
</div>
</body>
</html>
Webjars for jQuery and Bootstrap
Let’s now add in the webjars to our pom.xml
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.6</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap-datepicker</artifactId>
<version>1.0.1</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>1.9.1</version>
</dependency>
Using Web Jars in View
Make sure that you restart the application and we are ready to use jquery and bootstrap in our project.
If you expand your dependencies you should see the dependencies.
Referring to bootstrap css
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
rel="stylesheet">
Referring to Bootstrap js
<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
Referring to jQuery js
<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
Update view using jQuery and Bootstrap is shown below.
/src/main/webapp/WEB-INF/jsp/welcome.jsp
<html>
<head>
<title>Welcome</title>
<link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
rel="stylesheet">
</head>
<body>
<div class="container">
<table class="table table-striped">
<caption>Your todos are</caption>
<thead>
<tr>
<th>Description</th>
<th>Target Date</th>
<th>Is it Done?</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
<tr>
<td>Todo 1</td>
<td>10/12/2017</td>
<td>No</td>
<td><a class="btn btn-warning" href="/edit-todo">Edit Todo</a></td>
<td><a class="btn btn-warning" href="/delete-todo">Delete Todo</a></td>
</tr>
</tbody>
</table>
<div>
<a class="btn btn-default" href="/add-todo">Add a Todo</a>
</div>
<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</div>
</body>
</html>
Spring Boot would auto configure the webjars resource mapping. So you DON’T need to do this anymore.
<mvc:resources mapping="/webjars/**" location="/webjars/"/>
Just Released
