利用断点续传实现下载的原理是什么

OutputStream os=null;
 InputStream inputStream =null;
 File zipFile=null;
 try{
  long zipStart=System.currentTimeMillis();
  zipFile=createFile();//动态根据业务创建文件
  if(logger.isInfoEnabled()){
   logger.info(String.format("压缩ZIP 花费时间 %s(s) ",
  (System.currentTimeMillis()-zipStart)/1000));
  }
  if (zipFile.exists()) {
   long downloadStart=System.currentTimeMillis();
   inputStream= new BufferedInputStream(new FileInputStream(zipFile));
   response.reset();
   os=new BufferedOutputStream(response.getOutputStream());
   String userAgent = request.getHeader("USER-AGENT");
   String fileName=zipFile.getName();
   if (null != userAgent && -1 != userAgent.indexOf("MSIE")) {
    fileName = URLEncoder.encode(fileName, "UTF8");
   } else if (null != userAgent && -1 != userAgent.indexOf("Mozilla")) {
    fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");
   }
   response.setHeader("Accept-Ranges", "bytes");
   response.setHeader("Content-Disposition", 
  "attachment;filename="+ fileName);
   response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
   long pos = 0, fileSize=zipFile.length(),
 last=fileSize-1;
   response.setHeader("ETag",zipFile.getName().
   concat(Objects.toString(fileSize))
     .concat("_").concat(Objects.toString(zipFile.lastModified())));
   response.setDateHeader("Last-Modified",zipFile.lastModified());
   response.setDateHeader("Expires",
   System.currentTimeMillis()+1000*60*60*24);
   if (null != request.getHeader("Range")) {
    response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
    try {
     // 暂时只处理这2种range格式 1、RANGE: bytes=111- 2、Range: bytes=0-499
     String numRang = request.getHeader("Range")
   .replaceAll("bytes=", "");
     String[] strRange = numRang.split("-");
     if (strRange.length == 2) {
      pos = Long.parseLong(strRange[0].trim());
      last = Long.parseLong(strRange[1].trim());
     } else {
      pos = Long.parseLong(numRang.replaceAll("-", "").trim());
     }
    } catch (NumberFormatException e) {
     logger.error(request.getHeader("Range") + " error");
     pos = 0;
    }
   }
   long rangLength = last - pos + 1;
   String contentRange = new StringBuffer("bytes ").
   append(String.valueOf(pos)).
   append("-").append(last).append("/").
   append(String.valueOf(fileSize)).toString();
   response.setHeader("Content-Range", contentRange);
   response.addHeader("Content-Length",Objects.toString(rangLength));
   if(pos>0){
    inputStream.skip(pos);
   }
   byte[] buffer = new byte[1024*512];//每次以512KB 0.5MB的流量下载
   int length = 0,sendTotal=0;
   while (sendTotal < rangLength && length!=-1) {
    length = inputStream.read(buffer, 0,
  ((rangLength - sendTotal) <= buffer.length &#63;
      ((int) (rangLength - sendTotal)) : buffer.length));
    sendTotal = sendTotal + length;
    os.write(buffer, 0, length);
   }
   if(os!=null){
    os.flush();
   }
   if(logger.isInfoEnabled()){
    logger.info(String.format("下载 花费时间 %s(s) ",
  (System.currentTimeMillis()-downloadStart)/1000));
   }
  }
 }catch (Exception e){
  if(StringUtils.endsWithIgnoreCase(e.getMessage(),"Broken pipe")){
   logger.error("用户取消下载");
  }
  logger.error(e.getMessage(),e);
 }finally {
  if(os!=null){
   try{
    os.close();
   }catch (Exception e){}
  }
  if(inputStream!=null){
   try{
    IOUtils.closeQuietly(inputStream);
   }catch (Exception e){}
  }
 }
}