java - BOS/BIS 取得进展

Question

我有一个带有 BufferedInputStream 和 BufferedOutputStream 的上传，现在我想获得此上传的百分比进度。

如何获得这个？

     BufferedInputStream bis = null;
     BufferedOutputStream bos = null;
     try
     {
        URL url = new URL( sb.toString() );
        URLConnection urlc = url.openConnection();

        bos = new BufferedOutputStream( urlc.getOutputStream() );
        bis = new BufferedInputStream( new FileInputStream( source ) );

        int i;
        int progress = 0;
        while ((i = bis.read()) != -1)
        {
           bos.write( i );
           //how to get the progress here?!

        }
     }
     finally
     {
        if (bis != null)
           try
           {
              bis.close();
           }
           catch (IOException ioe)
           {
              ioe.printStackTrace();
           }
        if (bos != null)
           try
           {
              bos.close();
           }
           catch (IOException ioe)
           {
              ioe.printStackTrace();
           }

     }

Answer 1

没问题。您可以使用 CountingInputStream 和 CountingOutputStream 包装器来实现这些目的。请参阅Apache Commons IO 2.5 library .