在實際開發中，通常需要同時上傳圖片和視頻。Java提供了豐富的類庫和工具來實現這一目標。

所需工具：

javax.imageioimageio-core1.0org.bytedecojavacv1.5.5

上傳圖片：

//獲取文件擴展名
String ext = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
//使用ImageIO讀取圖片
BufferedImage image = ImageIO.read(file.getInputStream());
//將BufferedImage轉換成ByteArrayOutputStream
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, ext, baos);
//將ByteArrayOutputStream轉換成byte數組
byte[] bytes = baos.toByteArray();
//將byte數組上傳到服務器
fileService.upload(bytes);

上傳視頻：

//獲取文件擴展名
String ext = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
//根據擴展名確定視頻格式
int videoFormat;
if (".mp4".equals(ext)) {
videoFormat = org.bytedeco.javacpp.avutil.AV_PIX_FMT_YUV420P;
} else if (".flv".equals(ext)) {
videoFormat = org.bytedeco.javacpp.avutil.AV_PIX_FMT_BGR24;
} else {
throw new Exception("不支持的視頻格式");
}
//使用JavaCV獲取視頻幀
FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(file.getInputStream());
grabber.start();
Frame frame;
FrameRecorder recorder = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
//創建錄制器
recorder = FrameRecorder.createDefault(fileService.getFilePath(), grabber.getImageWidth(), grabber.getImageHeight());
recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
recorder.setFormat("mp4");
recorder.setFrameRate(grabber.getFrameRate());
recorder.setVideoQuality(1.0);
recorder.start();
while ((frame = grabber.grabFrame()) != null) {
Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage bufferedImage = converter.getBufferedImage(frame);
//將BufferedImage轉換成ByteArrayOutputStream
baos.reset();
ImageIO.write(bufferedImage, "jpg", baos);
//將ByteArrayOutputStream轉換成byte數組
byte[] bytes = baos.toByteArray();
//將byte數組編碼成視頻
byte[] yuvBytes = new byte[bytes.length / 3 * 2];
//使用JavaCV進行編碼
recorder.record(converter.convert(bufferedImage), videoFormat);
}
} finally {
if (recorder != null) {
recorder.stop();
recorder.release();
}
grabber.stop();
}