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Chapter 19: Spring Boot PUT REST API — @PutMapping Annotation
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Introduction
In this chapter, we will cover the @PutMapping annotation in Spring Boot. The @PutMapping annotation is used to handle HTTP PUT requests, which are typically used to update existing resources. We will create endpoints to update resources using this annotation, focusing on the Employee entity as our primary example.
Understanding @PutMapping Annotation
What is @PutMapping?
The @PutMapping annotation in Spring Boot is used to map HTTP PUT requests to specific handler methods in a controller.
It is a specialized version of the @RequestMapping annotation designed specifically for handling PUT requests, which are usually used for updating existing resources.
How @PutMapping Works
When a client sends an HTTP PUT request to a specified URL, the @PutMapping annotation maps this request to a specific handler method in the controller. The method processes the request, typically updating a resource on the server, and returns a response.
Key Features of @PutMapping
- Simplified Mapping:
@PutMappingprovides a clear and concise way to map HTTP PUT requests to specific methods, making the code more readable and maintainable. - Handling Update Operations: It is specifically designed for update operations, making it easier to handle requests that modify existing resources.
- Integration with @RequestBody: Often used in conjunction with
@RequestBodyto bind the request body to a method parameter, allowing for easy processing of complex data structures during an update. - Path Variables and Query Parameters: Supports the use of
@PathVariableand@RequestParamannotations to extract values from the URL and query parameters, making the method flexible and dynamic.
Example Use Case
A common use case for @PutMapping is updating a resource, such as updating an employee’s…
