如何將blob型別資料的圖片資料從資料庫中讀取出來，並儲存到本地呢？

程式碼如下：

定義一個實體類：

public class IdeaImgOutVo {

    private byte[] photo;//圖片
    private String plNO;//手冊編碼
    private String pictureName;//圖片名字

    public byte[] getPhoto() {
        return photo;
    }

    public void setPhoto(byte[] photo) {
        this.photo = photo;
    }

    public String getPlNO() {
        return plNO;
    }

    public void setPlNO(String plNO) {
        this.plNO = plNO;
    }

    public String getPictureName() {
        return pictureName;
    }

    public void setPictureName(String pictureName) {
        this.pictureName = pictureName;
    }
}

sql檔案：

<select id="outImg"  resultMap="imgVos">
    SELECT
    e.PICTUREDATA as piture,
    d.PLNO,
    b.BLOCKCODE
    from ET_PICTURE e left join ET_BLOCK b on e.BLOCKID = b.BLOCKID
    join ET_PBLOCK c on c.BLOCKID = b.BLOCKID
    join EM_PRODUCT d on d.PRODUCTID = c.PRODUCTID
    WHERE e.BLOCKID = '105'

</select>

service：

@Service
public class IdeaImgOutServiceImpl implements IdeaImgOutService {
    @Autowired
    private IdeaImgOutDao ideaImgOutDao;
    @Override
    public List<IdeaImgOutVo> outImg() {
        return ideaImgOutDao.outImg();
    }

    public R outImgsMain(){
        try {
            List<IdeaImgOutVo> vos = ideaImgOutDao.outImg();
            for (IdeaImgOutVo v: vos) {
                byte[] imgs = v.getPhoto();
                File file = new File("e:\\picture\\"+v.getPlNO()+"\\IMGE");
                if (!file.exists()){
                    file.mkdirs();
                }
                FileImageOutputStream outputStream = new FileImageOutputStream(new File("e:\\picture\\"+v.getPlNO()+"\\IMGE"+"\\"+v.getPictureName()+".jpg"));
                outputStream.write(imgs,0,imgs.length);
                outputStream.close();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.ok("圖片儲存完成");
    }
}

Controller：

@Controller
@RequestMapping(API_PATH+API_VERSION+IMG)
@Api(description = "匯出圖片並儲存")
public class IdeaImgOutController {
    public static final String IMG = "img";

    @Autowired
    private IdeaImgOutServiceImpl ideaImgOutService;

    @RequestMapping(value = "out")
    @ResponseBody
    public R outImg() {
        ideaImgOutService.outImgsMain();

        return R.ok("圖片儲存完成！");
    }


}

dao、serivce介面此處就不寫了，沒有啥內容，以上思路就是 定義一個 byte【】陣列型別的變數，以此接收blob型別的二進位制資料，然後使用 FileImageOutputStream 圖片輸出流 將資料儲存到本地。。