@PathVariable

@PathVariable是spring3.0的一个新功能：接收请求路径中占位符的值

    @PutMapping(value = "/users/{userId}/unLock")
    void unLock(@PathVariable("userId") String id, @RequestBody UnblockEvent unblockEvent) throws Exception {
        userService.apply(unblockEvent);
    }

id就是路径的userId值