What is the difference between below two attributes and which one to use when?
@GetMapping(path = "/usr/{userId}")
public String findDBUserGetMapping(@PathVariable("userId") String userId) {
return "Test User";
}
@RequestMapping(value = "/usr/{userId}", method = RequestMethod.GET)
public String findDBUserReqMapping(@PathVariable("userId") String userId) {
return "Test User";
}
As mentioned in the comments (and the documentation), value
is an alias to path
. Spring often declares the value
element as an alias to a commonly used element. In the case of @RequestMapping
(and @GetMapping
, ...) this is the path
property:
This is an alias for
path()
. For example@RequestMapping("/foo")
is equivalent to@RequestMapping(path="/foo")
.
The reasoning behind this is that the value
element is the default when it comes to annotations, so it allows you to write code in a more concise way.
Other examples of this are:
@RequestParam
(value
→ name
)@PathVariable
(value
→ name
)However, aliases aren't limited to annotation elements only, because as you demonstrated in your example, @GetMapping
is an alias for @RequestMapping(method = RequestMethod.GET
).
Just looking for references of AliasFor
in their code allows you to see that they do this quite often.