jdbc 日期处理问题

@Override
	public List<User> findAll() {
		List<User> list = new ArrayList<User>();
		
		Connection con = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		
		try {
			con = JdbcUtil.getConnection();
			String sql = "select * from [user]";
			
			stmt = con.prepareStatement(sql);
			
			rs = stmt.executeQuery();
			
			while(rs.next())
			{
				//精确到秒  yyyy-MM-dd HH:mm:ss
				User u = new User(rs.getInt("id"), rs.getString("username"),rs.getString("password"),rs.getTimestamp("createtime"));
				//精确到秒  yyyy-MM-dd
				//User u = new User(rs.getInt("id"), rs.getString("username"),rs.getString("password"),rs.getDate("createtime"));
				list.add(u);
				
			}
			return list;
			
		} catch (Exception e) {
			
			e.printStackTrace();
		}
		finally
		{
				JdbcUtil.close(rs, stmt, con);
			
		}
		
		return null;	
	}

	@Override
	public void add(User user) {
		Connection con = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		
		try {
			con = JdbcUtil.getConnection();
			String sql = "insert into [user](username,password,createtime) values(?,?,?)";
			stmt= con.prepareStatement(sql);
			stmt.setString(1, user.getUsername());
			stmt.setString(2,user.getPassword());
			//精确到秒  yyyy-MM-dd HH:mm:ss
			//stmt.setTimestamp(3,  new java.sql.Timestamp((new Date()).getTime()));
			//下面精确到 日  yyyy-MM-dd
			stmt.setDate(3, new java.sql.Date(new Date().getTime()));
			stmt.execute();
			
		} catch (Exception e) {
			
			e.printStackTrace();
		}finally
		{
			JdbcUtil.close(rs, stmt, con);
		}
		
	}