我正在下载软件上的文件，这就是我所得到的，它可以成功下载，并且我也可以取得进展，但是还有1件事我不知道该怎么做。测量下载速度。多谢您的协助。谢谢。这是当前的下载方法代码

public void run()

{

OutputStream out = null;

URLConnection conn = null;

InputStream in = null;

try

{

URL url1 = new URL(url);

out = new BufferedOutputStream(

new FileOutputStream(sysDir+"\\"+where));

conn = url1.openConnection();

in = conn.getInputStream();

byte[] buffer = new byte[1024];

int numRead;

long numWritten = 0;

double progress1;

while ((numRead = in.read(buffer)) != -1)

{

out.write(buffer, 0, numRead);

numWritten += numRead;

this.speed= (int) (((double)

buffer.length)/8);

progress1 = (double) numWritten;

this.progress=(int) progress1;

}

}

catch (Exception ex)

{

echo("Unknown Error: " + ex);

}

finally

{

try

{

if (in != null)

{

in.close();

}

if (out != null)

{

out.close();

}

}

catch (IOException ex)

{

echo("Unknown Error: " + ex);

}

}

}