1) @RequestParam is used to extract query parameters
http://localhost:3000/api/group/test?id=4
@GetMapping("/group/test")
public ResponseEntity<?> test(@RequestParam Long id) {
System.out.println("This is test");
return ResponseEntity.ok().body(id);
}
while @PathVariable is used to extract data right from the URI:
http://localhost:3000/api/group/test/4
@GetMapping("/group/test/{id}")
public ResponseEntity<?> test(@PathVariable Long id) {
System.out.println("This is test");
return ResponseEntity.ok().body(id);
}
2) @RequestParam is more useful on a traditional web application where data is mostly passed in the query parameters while @PathVariable is more suitable for RESTful web services where URL contains values.
3) @RequestParam annotation can specify default values if a query parameter is not present or empty by using a defaultValue attribute, provided the required attribute is false:
@RestController
@RequestMapping("/home")
public class IndexController {
@RequestMapping(value = "/name")
String getName(@RequestParam(value = "person", defaultValue = "John") String personName) {
return "Required element of request param";
}
}