@RequestMapping for base paths in Spring Boot - Mini Project: Build & Apply

Using @RequestMapping for Base Paths in Spring Boot

📖 Scenario: You are building a simple Spring Boot web application that manages greetings. You want to organize your controller so that all greeting-related URLs start with the same base path.

🎯 Goal: Create a Spring Boot controller class with a base path using @RequestMapping at the class level, and add methods to handle specific greeting requests under that base path.

📋 What You'll Learn

Create a controller class named GreetingController

Use @RequestMapping at the class level with the base path /greetings

Add a method hello() mapped to /hello that returns the string Hello, World!

Add a method goodbye() mapped to /goodbye that returns the string Goodbye, World!

💡 Why This Matters

🌍 Real World

Organizing controller URLs with base paths helps keep your web application routes clean and easy to manage.

💼 Career

Understanding how to use @RequestMapping for base paths is essential for building REST APIs and web applications in Spring Boot, a common skill for Java backend developers.

1

Create the GreetingController class

Create a public class named GreetingController annotated with @RestController.

Spring Boot

@RestController
// Your code here

Need a hint?

Use @RestController to make the class a REST controller.

2

Add @RequestMapping base path to the class

Add @RequestMapping("/greetings") annotation to the GreetingController class to set the base path for all methods.

Spring Boot

import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;

@RestController
// Add @RequestMapping with base path "/greetings" here
public class GreetingController {

}

Need a hint?

Place @RequestMapping("/greetings") above the class declaration.

3

Add hello() method mapped to /hello

Inside GreetingController, add a public method named hello annotated with @RequestMapping("/hello") that returns the string Hello, World!.

Spring Boot

import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;

@RestController
@RequestMapping("/greetings")
public class GreetingController {
    // Add hello() method with @RequestMapping("/hello") here
}

Need a hint?

Use @RequestMapping("/hello") above the method and return the exact string.

4

Add goodbye() method mapped to /goodbye

Add a public method named goodbye annotated with @RequestMapping("/goodbye") that returns the string Goodbye, World! inside GreetingController.

Spring Boot

import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;

@RestController
@RequestMapping("/greetings")
public class GreetingController {

    @RequestMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }

    // Add goodbye() method with @RequestMapping("/goodbye") here
}

Need a hint?

Use @RequestMapping("/goodbye") above the method and return the exact string.