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@PathVariable vs @RequestParam

Two ways to read data out of a request URL — a path SEGMENT vs a query string parameter.

// GET /api/users/42
@GetMapping("/{id}")
public User getUser(@PathVariable Long id) { ... }

// GET /api/users?page=2&size=20
@GetMapping
public List<User> list(@RequestParam int page, @RequestParam(defaultValue = "10") int size) { ... }

@PathVariable — part of the URL path itself, usually an identifier
@RequestParam — optional query string key=value pairs, supports defaultValue