问使用java优化下载速度

EN

        float fileSize = Float.parseFloat(uc.getHeaderField("Content-Length"));

        in = new BufferedInputStream(uc.getInputStream());

        System.out.println("File size : " + fileSize);


        fout = new FileOutputStream(settingsForm.downloadDirectoryText.getText() + File.separatorChar + fileName);
        int BUFFER_SIZE = 10240;
        byte data[] = new byte[BUFFER_SIZE];
        int count = 0;
        int totalDownloaded = 0;

        long downloadStartTime = System.currentTimeMillis();
        long remainingTime = 0;



        while ((count = in.read(data, 0, BUFFER_SIZE)) != -1) {

            totalDownloaded += count;
            long elapsedTime = System.currentTimeMillis() - downloadStartTime;

            float speedInBytes = 1000f * totalDownloaded / elapsedTime;
            float tmpSpeed = speedInBytes;
            if (tmpSpeed > 1024) {
                tmpSpeed = tmpSpeed / 1024;
            }
            if (tmpSpeed > 1024 * 1024) {
                tmpSpeed = tmpSpeed / (1024 * 1024);
            }
            System.out.println("Speed : " + tmpSpeed);
            System.out.println("Remaining Time : " + (fileSize - totalDownloaded) / speedInBytes + " seconds");
            int downloadPercentage = (int) ((totalDownloaded / fileSize) * 100);

            fout.write(data, 0, count);
        }