java代码如何实现存取数据库的blob字段

@Data
public class TTT {
    private String id;
    private String name;
    private  String createTime;
    private byte[] miaoshuByte;
    private InputStream miaoshuInputstream;
}

public class FileUtil {
    /**
     * file转byte
     */
    public static byte[] file2byte(File file) throws IOException {
        FileInputStream fis = null;
        ByteArrayOutputStream bos = null;
        try {
            fis = new FileInputStream(file);
            bos = new ByteArrayOutputStream();
            IOUtils.copy(fis, bos);
            byte[] bytes = bos.toByteArray();
            return bytes;
        }finally {
            if (fis != null) {
                fis.close();
            }
            if (bos != null) {
                bos.close();
            }
        }
    }
 
    /**
     * byte 转file
     */
    public static File byte2File(byte[] buf,String fileName) throws IOException {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(fileName);
            fos.write(buf);
            File file = new File(fileName);
            return file;
        } finally {
            if (fos != null) {
                fos.close();
            }
        }
    }
} 

@RestController
@RequestMapping("order/")
@Slf4j
public class SendHttpWController {
    @Autowired
    private UtimeeMapper utimeeMapper;

    @GetMapping("/aa")
    public String queryById( Integer id) throws IOException {
        TTT ttt = new TTT();
        ttt.setId("30");
        ttt.setName("张三");
        File file = new File("F:\\Desktop\\aa.docx");
        byte[] bytes = FileUtil.file2byte(file);
        ttt.setMiaoshuByte(bytes);
        FileInputStream fileInputStream = new FileInputStream(file);
        ttt.setMiaoshuInputstream(fileInputStream);
        utimeeMapper.insert01(ttt);
        return "嘿嘿额黑8082";
    }
    @GetMapping("/bb")
    public String bb( Integer id) throws IOException {
        TTT ttt = utimeeMapper.select01("30");
        byte[] bytes = ttt.getMiaoshuByte();
        FileUtil.byte2File(bytes,"F:\\Desktop\\cc.docx");
        InputStream inputStream = ttt.getMiaoshuInputstream();
        FileOutputStream outputStream = new FileOutputStream("F:\\Desktop\\dd.docx");
        IOUtils.copy(inputStream, outputStream);//记得添加关流代码(本代码省略了)
        return "嘿嘿额黑8082";
    }