Play Store Application link – Spring Framework in 9 steps – Apps on Google Play
The Spring MVC framework helps build web applications using the Model-View-Controller (MVC) pattern, which separates an application into three parts:
- Model: Represents the application’s data and business logic.
- View: Renders data for the user (e.g., web pages).
- Controller: Handles user input and updates the Model and View.
Github Project link (XML based) – https://github.com/kuldeep101990/SpringMVCXml
Github Project link (Annotation based) – https://github.com/kuldeep101990/SpringMVCAnnotation
Example: Spring MVC in Action
Let’s look at a basic Spring MVC example.
1. Controller Example
@Controller
public class MyController {
@GetMapping("/") // Maps to the root URL
public String root() {
// Returns the logical view name "home.jsp"
return "home";
}
@GetMapping("/greet") // Maps to "/greet"
public String greet(@RequestParam(name = "name", defaultValue = "Guest") String name, Model model) {
// Adds the "name" to the Model
model.addAttribute("name", name);
// Returns the logical view name "greet.jsp"
return "greet";
}
@GetMapping("/user") // Maps to "/user"
public String user(Model model) {
// Creates a User object as the Model
User user = new User("John", "Doe");
// Adds the "user" to the Model
model.addAttribute("user", user);
// Returns the logical view name "user.jsp"
return "user";
}
}
2. Model example
public class User {
private String firstName;
private String lastName;
public User(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
}
3. JSP View Example (home.jsp)
<html>
<head>
<title>Spring MVC Home</title>
</head>
<body>
<h1>Welcome to Spring MVC Framework!</h1>
<p><a href="${pageContext.request.contextPath}/greet">Greet</a> | <a href="${pageContext.request.contextPath}/user">User Info</a></p>
</body>
</html>
Conclusion
The Spring MVC framework simplifies web development by clearly separating concerns:
- Controllers handle requests.
- Models contain data.
- Views render the data to the user.
By configuring basic components like the Controller and ViewResolver, you can easily build a fully functional Spring MVC web application.