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Chapter 16: Spring Boot REST API with Request Param | Spring Boot Course
Previous Chapter:
Introduction
In this chapter, we will explore how to create a Spring Boot REST API that uses the @RequestParam annotation to handle query parameters. Query parameters are a common way to pass data to REST endpoints, especially for filtering, sorting, or paginating results. We will continue from the previous chapters and extend our StudentController to demonstrate the use of @RequestParam.
@RequestParam Annotation
What is @RequestParam?
The @RequestParam annotation in Spring Boot is used to extract query parameters from the URL and bind them to method parameters in a controller. It helps in mapping specific query parameters in the URL to method parameters, allowing for more flexible and dynamic request handling.
How @RequestParam Works
When a client sends a request to a specific URL with query parameters, the @RequestParam annotation extracts these parameters and assigns them to method parameters. This is useful for accessing and processing additional information provided in the query string of the URL.
Key Features of @RequestParam
- Binding Query Parameters to Method Parameters: It directly binds query parameters from the URL to the method parameters in the controller.
- Default Values: You can specify default values for query parameters to handle cases where the parameter might not be provided in the URL. This ensures that your method can handle requests gracefully, even if some parameters are missing.
- Optional Parameters: You can mark parameters as optional, allowing the method to be called even if the parameter is not present in the query string. This adds flexibility to your request handling.
- Type Conversion: Spring Boot automatically converts query parameters from strings to the appropriate data type for the method parameter, making it easier to work with various types of data.
