Spring Boot Web MVC
Spring boot makes easy for us developers to get up and running with a spring mvc project. You add the following dependencies and you are ready to go.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
We are using thymeleaf for our views.
Create a controller.
Pay attention to the @Controller annotation which turns this class, UserController, into a spring controller component.
@Controller
public class UserController {
}
Create a request handler within @Controller.
In this case we are using a Get request handler. Use the Model class to pass data to you view.
@GetMapping("/home")
public String home(Model model){
log.debug("home(..)");
model.addAttribute("message", "Welcome to my page");
log.debug("model={}",ObjectUtils.toJson(model));
return "home";
}
Create a view.
Views are generally located in the templates folder under resources folder. Here we are creating a view for our home page.
<!DOCTYPE HTML>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<meta name="viewport"
content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Spring Boot Thymeleaf Hello World Example</title>
<link rel="stylesheet" th:href="@{/css/main.css}" />
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="#">Folau Kaveinga</a>
</nav>
<div role="main" class="container">
<div class="starter-template">
<h1>Spring Boot Web Thymeleaf Example</h1>
<h2>
<span th:text="'Hello, ' + ${message}"></span>
</h2>
</div>
</div>
<!-- /.container -->
</body>
<!-- jQuery library -->
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<!-- Popper JS -->
<script
src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script
src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
</html>
Static files
Static files such as css and js files can be served from the static folder under the resources folder.
For demo purposes, let create a main css file to style our home page.
body {
padding-top: 5rem;
}
.starter-template {
padding: 3rem 1.5rem;
text-align: center;
}
h1{
color:#0000FF;
}
h2{
color:#FF0000;
}
If you start your server and go to /home, your should see the home page being displayed.
Source code on Github