具體程式碼如下：

File source =new File('C:/Users/Qiang/Desktop/Alone.mp3'); 
Encoder encoder = new Encoder();
MultimediaInfo m = encoder.getInfo(source);
long ls = m.getDuration();
duration = ls/1000;
System.out.println("time is:"+ls/60000+"min"+(ls/1000-ls/60000*60)+"sec");

MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request; 
 Iterator<String> iter = multiRequest.getFileNames(); 
while(iter.hasNext()){
          MultipartFile file = multiRequest.getFile(iter.next());
          String fileOldName = file.getOriginalFilename();
          long duration = 0;
          CommonsMultipartFile cf= (CommonsMultipartFile)file;
          DiskFileItem fi = (DiskFileItem)cf.getFileItem();
          File source = fi.getStoreLocation(); 
          Encoder encoder = new Encoder();
          MultimediaInfo m = encoder.getInfo(source);
          long ls = m.getDuration();
          duration = ls/1000;}