SpringBoot Controller ์ ๋ฆฌ Controller ๋ณด๋ฌ๊ฐ๊ธฐ UserController ๋ณด๋ฌ๊ฐ๊ธฐโ RoomController ๋ณด๋ฌ๊ฐ๊ธฐโ FileController ๋ณด๋ฌ๊ฐ๊ธฐโ