public class FileUtil {    @Value("${img.url}")    public String imgUrl;    @Value("${video.url}")    public String videoUrl;

    /**     * 保存图片     * @param files 图片流     * @return     */    public String saveImg(MultipartFile[] files) {        StringBuilder builder = new StringBuilder();        for (MultipartFile file : files) {            //获取文件名称            String fileName = file.getOriginalFilename();            //生成新文件名称            String newFileName = UUID.randomUUID() + fileName.substring(fileName.indexOf("."));            File startUrl = new File(imgUrl);            //创建文件夹            if (!startUrl.exists()) {                startUrl.mkdirs();            }            //生成文件            File fileSave = new File(imgUrl + newFileName);            //保存文件            try {                file.transferTo(fileSave);                builder.append("," + newFileName);            } catch (IOException e) {                e.printStackTrace();                return "error";            }        }        return builder.toString();    }

    /**     * 保存视频     * @param file 视频流     * @return     */    public String saveVideo(MultipartFile file) {        //获取文件名称        String fileName = file.getOriginalFilename();        //生成新文件名称        String newFileName = UUID.randomUUID() + fileName.substring(fileName.indexOf("."));        File startUrl = new File(videoUrl);        //创建文件夹        if (!startUrl.exists()) {            startUrl.mkdirs();        }        //生成文件        File fileSave = new File(videoUrl + newFileName);        //保存文件        try {            file.transferTo(fileSave);        } catch (IOException e) {            e.printStackTrace();            return "error";        }        return newFileName;    }

    /**     * 删除视频     * @param name     * @return     */    public void deletFile(String name) {        File file = new File(videoUrl + name);        if (file.exists()) {            file.delete();        }    }

    /**     * 删除图片     * @param name     * @return     */    public void deletFiles(String name) {        File file = new File(imgUrl + name);        if (file.exists()) {            file.delete();        }    }

    /**     * 截取视频的帧，形成视频的预览图片     *     * @param videoName 视频名     */    public String cutPhotoFromVedio(String videoName) {        FFmpegFrameGrabber ff = null;        String videoPath = videoUrl + videoName;        String imgPath = videoUrl + videoName.substring(0, videoName.lastIndexOf(".")) + ".jpg";        String newImgName = videoName.substring(0, videoName.lastIndexOf(".")) + ".jpg";        File targetFile = new File(imgPath);        try {            ff = new FFmpegFrameGrabber(videoPath);            ff.start();            int lenght = ff.getLengthInFrames();            int i = 0;            Frame f = null;            while (i < lenght) {                // 过滤前5帧，避免出现全黑的图片，依自己情况而定                f = ff.grabFrame();                if ((i > 5) && (f.image != null)) {                    break;                }                i++;            }            opencv_core.IplImage img = f.image;            int owidth = img.width();            int oheight = img.height();            // 对截取的帧进行等比例缩放            int width = 800;            int height = (int) (((double) width / owidth) * oheight);            BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);            bi.getGraphics().drawImage(f.image.getBufferedImage().getScaledInstance(width, height, Image.SCALE_SMOOTH),                    0, 0, null);            ImageIO.write(bi, "jpg", targetFile);        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (ff != null) {                    ff.stop();                }            } catch (FrameGrabber.Exception e) {                e.printStackTrace();            }        }        return newImgName;    }}

/**　*　　文件下载

　*　　fileName 文件名称

*/

public Response download(HttpServletResponse response, String fileName) {    if (fileName != null) {        File file = new File(filePath, fileName);        if (file.exists()) {            response.reset();            response.setContentType("application/octet-stream; charset=utf-8");            try {                response.setHeader("Content-Disposition", "attachment;" +                        "filename=" + new String(fileName.getBytes("UTF8"), "ISO8859-1"));            } catch (UnsupportedEncodingException e) {                e.printStackTrace();            }            byte[] b = new byte[1024];            FileInputStream fis = null;            BufferedInputStream bis = null;            try {                fis = new FileInputStream(file);                bis = new BufferedInputStream(fis);                OutputStream os = response.getOutputStream();                int i = bis.read(b);                while (i != -1) {                    os.write(b, 0, i);                    i = bis.read(b);                }                return new Response().success("文件下载成功！");            } catch (FileNotFoundException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            } finally {                if (bis != null) {                    try {                        bis.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }                if (fis != null) {                    try {                        fis.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }    }    return new Response().success();}

/**　*　　IO读取视频或图片

　*　　videoName 文件名称

*/

public void getVideo(String videoName, HttpServletResponse response) throws IOException {    response.setContentType("images/*;charset=UTF-8");    ServletOutputStream out = null;    FileInputStream ips = null;    String filePath = videoUrl + videoName;    try {        File file = new File(filePath);        if (file.exists()) {            ips = new FileInputStream(new File(filePath));            out = response.getOutputStream();            int len = 0;            byte[] buffer = new byte[1024 * 10];            while ((len = ips.read(buffer)) != -1) {                out.write(buffer, 0, len);            }        }    } catch (Exception e) {        e.printStackTrace();    } finally {        if (!StringUtils.isEmpty(out)) {            out.flush();            out.close();            ips.close();        }

    }}