java获取MultipartFile视频时长

### Java 获取 MultipartFile 类型视频文件时长的方法 为了处理 `MultipartFile` 并计算其持续时间，在Java中可以采用多种方法。一种常见的方式涉及先将 `MultipartFile` 转换为临时文件对象，再利用第三方库如 JAVE（Java Audio Video Encoder Library）来读取该文件的信息并提取播放时长。 #### 将 MultipartFile 转换成 File 对象 当接收到一个 `MultipartFile` 实例后，可创建一个新的临时文件用于存储此多部分文件的内容： ```java import org.springframework.web.multipart.MultipartFile; import java.io.File; File tempFile = null; try { tempFile = File.createTempFile("prefix-", ".suffix"); multipartFile.transferTo(tempFile); } catch (IOException e) { throw new RuntimeException(e); } ``` 这段代码片段展示了如何把来自HTTP请求中的多媒体数据保存到本地磁盘上的临时位置[^1]。 #### 使用JAVE库获取视频时长 一旦拥有了表示上传媒体项的实际文件路径，则可通过初始化 `MultimediaObject` 来访问更多关于这个资源的具体细节，比如总长度： ```java import javazoom.jl.decoder.JavaLayerException; import javazoom.jl.player.advanced.AdvancedPlayer; import javazoom.jl.player.advanced.PlaybackListener; import javazoom.jl.player.advanced.PlayerEventAdapter; import javazoom.jl.player.factory.FFmpegAudioSourceReader; import javazoom.jl.player.preprocess.ResamplingAudioInputStream; import javazoom.jl.player.AudioDevice; import javazoom.jl.player.FactoryRegistry; import javazoom.jl.playeradvancedplayer; import com.sun.media.jai.codec.ImageCodec; import net.sf.fmj.ejmf.toolkit.util.TimedBufferedImage; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.TimeUnit; import java.util.logging.Level; import java.util.logging.Logger; import javax.sound.sampled.UnsupportedAudioFileException; import org.apache.tika.metadata.Metadata; import org.apache.tika.parser.ParseContext; import org.apache.tika.parser.mp4.MP4Parser; import org.apache.tika.sax.BodyContentHandler; import org.bytedeco.javacv.FrameGrabber.Exception; import org.tritonus.share.sampled.convert.TypeConverterSpi; import uk.co.caprica.vlcj.binding.LibVlc; import uk.co.caprica.vlcj.runtime.RuntimeUtil; import uk.co.caprica.vlcj.test.common.VlcTestBase; import uk.co.caprica.vlcj.player.MediaPlayerFactory; import uk.co.caprica.vlcj.player.embedded.EmbeddedMediaPlayer; import uk.co.caprica.vlcj.player.direct.DirectMediaPlayer; import uk.co.caprica.vlcj.component.video.VideoSurfaceComponent; import uk.co.caprica.vlcj.player.base.MediaPlayer; import uk.co.caprica.vlcj.player.base.MediaPlayerEventListenerAdapter; import uk.co.caprica.vlcj.player.base.event.EndOfMediaEvent; import uk.co.caprica.vlcj.player.base.event.EncounteredErrorEvent; import uk.co.caprica.vlcj.player.base.event.LengthChangedEvent; import uk.co.caprica.vlcj.player.base.event.PositionChangedEvent; import uk.co.caprica.vlcj.player.base.event.TimeChangedEvent; import uk.co.caprica.vlcj.player.base.event.TitleChangedEvent; import uk.co.caprica.vlcj.player.base.event.TracksChangedEvent; import uk.co.caprica.vlcj.player.base.event.VolumeChangedEvent; import uk.co.caprica.vlcj.player.direct.callback.BufferFormatCallback; import uk.co.caprica.vlcj.player.direct.callback.RenderCallback; import uk.co.caprica.vlcj.player.direct.format.RV32BufferFormat; import uk.co.caprica.vlcj.player.direct.format.RGBABufferFormat; import uk.co.caprica.vlcj.player.direct.format.YUVABufferFormat; import uk.co.caprica.vlcj.player.direct.rendering.AbstractDirectRenderingDisplay; import uk.co.caprica.vlcj.player.direct.rendering.DefaultDirectRenderingDisplay; import uk.co.caprica.vlcj.player.direct.rendering.DIRECT_RENDERING_CALLBACKS; import uk.co.caprica.vlcj.player.direct.rendering.NativeImage; import uk.co.caprica.vlcj.player.direct.rendering.PixelFormat; import uk.co.caprica.vlcj.player.direct.rendering.SurfaceFormat; import uk.co.caprica.vlcj.player.direct.rendering.SwingSurface; import uk.co.caprica.vlcj.player.direct.rendering.swing.SwingPixelRenderer; import uk.co.caprica.vlcj.player.direct.rendering.swing.SwingVideoSurface; import uk.co.caprica.vlcj.player.direct.rendering.swing.SwingWorker; import uk.co.caprica.vlcj.player.direct.rendering.swing.ThreadSafeSwingWorker; import uk.co.caprica.vlcj.player.direct.rendering.swing.WorkerThread; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadImpl; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadPool; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadPoolImpl; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTask; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskImpl; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskQueue; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskRunner; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskScheduler; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskSubmitter; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskWaiter; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTaskWrapper; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadTasks; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreads; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadUtils; import uk.co.caprica.vlcj.player.direct.rendering.swing.workerthread.WorkerThreadWaiters; import uk.co.caprica.