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  • 多线程下载文件

    1.计算每条线程下载的文件长度

     计算出每段下载文件的大小,已经开始和结束位置。

    2.各个线程下载不同长度的文件

     RandomAccessFile rfile = new RandomAccessFile(file, "rwd");
        rfile.seek(startpos);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5 * 1000);
        conn.setRequestProperty("Range", "bytes="+ startpos+"-"+ endpos);
        InputStream inStream = conn.getInputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len=inStream.read(buffer)) != -1){
         rfile.write(buffer, 0, len);
        }
        inStream.close();
        rfile.close();
        System.out.println("线程"+ (threadid+1) + "下载完成");

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  • 原文地址:https://www.cnblogs.com/Contoso/p/2368865.html
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