What is the use of @PathVariable and @RequestParam?
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In Spring Boot, @PathVariable and @RequestParam are used to extract values from a client’s request, but they serve different purposes. @PathVariable is used to capture values directly from the URL path. For example, if the URL is /users/10, using @PathVariable int id in the method lets you fetch the value 10 as the user ID. It is best used when the data uniquely identifies a resource, like product ID, order ID, or employee number. On the other hand, @RequestParam extracts values from query parameters in the URL. For instance, a URL like /search?keyword=java&page=2 can be mapped using @RequestParam String keyword, @RequestParam int page. This is ideal for optional filters, search queries, pagination, or sorting where multiple parameters may vary. In simple terms, @PathVariable is for mapping values that are part of the URL structure, while @RequestParam is for key-value pairs in the query string. Together, they provide flexibility in designing REST APIs, making them user-friendly, dynamic, and efficient.
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