@RestController

public class HelloController {

    @RequestMapping(value="/say/{id}", method = RequestMethod.GET)

    public String say(@PathVariable("id") Integer id){

        return "id:"+id;

    }

}

@RestController

public class HelloController {

    @RequestMapping(value="/say", method = RequestMethod.GET)
    //@GetMapping(value="/say") 简化的写法

    public String say(@RequestParam("id") Integer myid){

        return "id:"+myid;

    }

}