Small question regarding how to get the Spring request mapping (GET mapping, POST mapping...), the path (route) parameter(s) as variable(s). A bit of background, we currently have a use case where we take a route, compute some information, (the Disaster Recovery URL, the test URL, the most available URL, but the question is not here) and respond back. This is just a partial example to have something a bit more concrete in the question.
Query at http://the-main-host.com/firstRoute We return http://go-to-region-us-west3.com/firstRoute and maybe minutes later, we return http://go-to-region-eu-central.com/firstRoute , but again, this is not the question.
@GetMapping(path = "/{id}/firstRoute", produces = MediaType.APPLICATION_JSON_VALUE)
public Mono<String> question(@PathVariable @NotBlank final String id, String url) {
String theUrlEnrichedWithOtherInformation = computeExtraInformationForURL(id, url);
return Mono.just(theUrlEnrichedWithOtherInformation + id + "/firstRoute");
}
With time, we are now at some 300 of those handlers, all with real use cases
@PostMapping(path = "/{id}/twoHundredAndFiveRoute", produces = MediaType.APPLICATION_JSON_VALUE)
public Mono<String> question(@PathVariable @NotBlank final String id, String url) {
String theUrlEnrichedWithOtherInformation = computeExtraInformationForURL(id, url);
return Mono.just(theUrlEnrichedWithOtherInformation + id + "/twoHundredAndFiveRoute");
}
@GetMapping(path = "/{id}/twoHundredSixtySevenRoute", produces = MediaType.APPLICATION_JSON_VALUE)
public Mono<String> question(@PathVariable @NotBlank final String id, String url) {
String theUrlEnrichedWithOtherInformation = computeExtraInformationForURL(id, url);
return Mono.just(theUrlEnrichedWithOtherInformation + id + "/twoHundredSixtySevenRoute");
}
We managed to make it more maintainable by using the Spring array of the path annotation. This way of doing is a bit nicer, it brought down our two hundred methods down to a single digit. We would like to keep using this way is possible. However, we lose the information what was the path being invoked.
@GetMapping(path = {"/{id}/firstRoute", "/{id}/twoHundredSixtySevenRoute"}, produces = MediaType.APPLICATION_JSON_VALUE)
public Mono<String> question(@PathVariable @NotBlank final String id, String url) {
String theUrlEnrichedWithOtherInformation = computeExtraInformationForURL(id, url);
return Mono.just(theUrlEnrichedWithOtherInformation + id + getThePathThatWasUsedFromTheArrayPlease());
}
Is it possible to get it back, like in this speculative example?
What you need is to access the HttpServletRequest instance. This has a lot of information about http invocation.
Spring allow us an easy way to access to this instance:
@RequestMapping(value = "/report/{objectId}", method = RequestMethod.GET)
public @ResponseBody void generateReport(
@PathVariable("objectId") Long objectId,
HttpServletRequest request) {
}
If you have access to HttpServletRequest, you can get any part of the url:
Example: http://myhost:8080/people?lastname=Fox&age=30
String uri = request.getScheme() + "://" + // "http" + "://
request.getServerName() + // "myhost"
":" + // ":"
request.getServerPort() + // "8080"
request.getRequestURI() + // "/people"
"?" + // "?"
request.getQueryString(); // "lastname=Fox&age=30"
request.getRequestURI() should have the path value that you need.
You can get it from HttpServletRequest - request.getRequestURI(). Either autowire it or use it from method parameter.