问如何在服务器上，在Android上发布大视频？

EN

public class FormDataWriter extends FilterOutputStream{
   private final HttpURLConnection con;

   /**
    * @param formName name of form in which data are sent
    * @param fileName
    * @param fileSize   size of file, or -1 to use chunked encoding
    */
   FormDataWriter(HttpURLConnection con, String formName, String fileName, long fileSize) throws IOException{
      super(null);
      this.con = con;
      con.setDoOutput(true);

      String boundary = generateBoundary();
      con.setRequestProperty(HTTP.CONTENT_TYPE, "multipart/form-data; charset=UTF-8; boundary="+boundary);
      {
         StringBuilder sb = new StringBuilder();
         writePartHeader(boundary, formName, fileName==null ? null : "filename=\""+fileName+"\"",
               "application/octet-stream", sb);
         headerBytes = sb.toString().getBytes("UTF-8");

         sb = new StringBuilder();
         sb.append("\r\n");
         sb.append("--"+boundary+"--\r\n");
         footerBytes = sb.toString().getBytes();
      }
      if(fileSize!=-1) {
         fileSize += headerBytes.length + footerBytes.length;
         con.setFixedLengthStreamingMode((int)fileSize);
      }else
         con.setChunkedStreamingMode(0x4000);
      out = con.getOutputStream();
   }

   private byte[] headerBytes, footerBytes;

   private String generateBoundary() {
      StringBuilder sb = new StringBuilder();
      Random rand = new Random();
      int count = rand.nextInt(11) + 30;
      int N = 10+26+26;
      for(int i=0; i<count; i++) {
         int r = rand.nextInt(N);
         sb.append((char)(r<10 ? '0'+r : r<36 ? 'a'+r-10 : 'A'+r-36));
      }
      return sb.toString();
   }

   private void writePartHeader(String boundary, String name, String extraContentDispositions, String contentType, StringBuilder sb) {
      sb.append("--"+boundary+"\r\n");
      sb.append("Content-Disposition: form-data; charset=UTF-8; name=\""+name+"\"");
      if(extraContentDispositions!=null)
         sb.append("; ").append(extraContentDispositions);
      sb.append("\r\n");
      if(contentType!=null)
         sb.append("Content-Type: "+contentType+"\r\n");
      sb.append("\r\n");
   }

   @Override
   public void write(byte[] buffer, int offset, int length) throws IOException{
      if(headerBytes!=null) {
         out.write(headerBytes);
         headerBytes = null;
      }
      out.write(buffer, offset, length);
   }

   @Override
   public void close() throws IOException{
      flush();
      if(footerBytes!=null) {
         out.write(footerBytes);
         footerBytes = null;
      }
      super.close();
      int code = con.getResponseCode();
      onHandleResult(code);
   }
   protected void onHandleResult(int code) throws IOException{
      if(code!=200 && code!=201)
         throw new IOException("Upload error code: "+code);
   }
}