public List<User> findAllUser() throws Exception {
		Connection con = ConnectionFactory.getConnection();
		User user = null;
		List<User> users = new ArrayList<User>();
		String sql = "select * from d_user";
		PreparedStatement prep = con.prepareStatement(sql);
		ResultSet rs = prep.executeQuery();
		while (rs.next()) {
			user = new User();
			user.setId(rs.getInt("id"));
			user.setNickname(rs.getString("nickname"));
			user.setEmail(rs.getString("email"));
			user.setPassword(rs.getString("password"));
			users.add(user);
		}
		return users;
	}