[FIXED] How to access a PathVariable of a controller specified at class level in Spring?

Issue

Can I do something like this with Spring MVC ?

@RequestMapping(value = "/{root}")
public abstract class MyBaseController {

    @PathVariable(value = "root")
    protected ThreadLocal<String> root;

}

@Controller
public class MyController extends MyBaseController {

    @RequestMapping(value = "/sayHello")
    @ResponseBody
    public String hello() {
        return "Hello to " + this.root.get();
    }

}

When I request to http://..../roberto/sayHello, I get this as response:

Hello to roberto

Solution

You can have a path variable in the controller URL-prefix template like this:

@RestController
@RequestMapping("/stackoverflow/questions/{id}/actions")
public class StackOverflowController {

    @GetMapping("print-id")
    public String printId(@PathVariable String id) {
        return id;
    }
}

so that when a HTTP client issues a request like this

GET /stackoverflow/questions/q123456/actions/print-id HTTP/1.1

the {id} placeholder is resolved as q123456.

Answered By - Raffaele