1. controller
2. view -> 수정정보 ajax 로 전송
3. restcontroller
4. service
5. db 저장

session 수정

@PutMapping("/user")
	public ResponseDto<Integer> update(@RequestBody User user) {
		System.out.println("save 호출");
		userService.회원수정(user);
		
		Authentication authentication = authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(user.getUsername(), user.getPassword()));
		SecurityContextHolder.getContext().setAuthentication(authentication);
		
		return new ResponseDto<Integer>(HttpStatus.OK.value(),1);