In this example:
We've created a HelloController class annotated with @RestController to indicate it's a controller for RESTful web services.
We've used @RequestMapping("/hello") to map the controller to the /hello endpoint.
We've defined methods for handling GET, POST, PUT, and DELETE requests, each annotated with the corresponding @GetMapping, @PostMapping, @PutMapping, and @DeleteMapping annotations.
We've used @PathVariable to inject the id parameter from the URL path into the method arguments.
We've used @RequestBody to inject the request body into the method arguments.
This is a very basic example, but it should give you an idea of how to create a REST controller in Spring.
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