保存图片到MySQL以及从MySQL读取图片全过程

USE ikun; 
CREATE TABLE `img` (
  `id` int NOT NULL AUTO_INCREMENT,
  `img` mediumblob NOT NULL,
  `date` date NOT NULL,
  PRIMARY KEY (`id`)
) ;

public static void saveInMySQL(String url) throws IOException {
        //获得连接对象
        Connection con = DBUtil.getConnection("root","******","ikun");
        PreparedStatement pre = null;
        //获取图片信息，做输出流
        InputStream in = getEntityByHttpGetMethod(url).getContent();
        BufferedInputStream inputStream = new BufferedInputStream(in);
        try {
            String sql = "insert into img (img,date) values (?,?)";
            pre = con.prepareStatement(sql);
            pre.setBinaryStream(1,inputStream,in.available());
            Date date = new Date(System.currentTimeMillis());
            pre.setDate(2,date);
            //获取返回结果
            int i = pre.executeUpdate();
            System.out.println(i);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

public static void readFromMysql(){
        //获得连接对象
        Connection con = DBUtil.getConnection("root","******.","ikun");
        PreparedStatement pre = null;
        ResultSet res = null;
        try {
            //这里读取一张
            String sql = "select * from img where id = 1";
            pre = con.prepareStatement(sql);
            res = pre.executeQuery(sql);
            while (res.next()){
                int id = res.getInt("id");
                InputStream stream = res.getBinaryStream("img");
                Date date = res.getDate("date");
                System.out.println("图片id为"+id+" 创建时间为"+date.toString());
                Files.copy(stream, Paths.get("D:\\ikun.jpg"));
            }
        } catch (SQLException | IOException e) {
            e.printStackTrace();
        }
        //断开连接
        DBUtil.close();
    }