java文件断点续传下载或视频播放

代码

		@GetMapping("/download")
	public void download(Long id, HttpServletRequest request, HttpServletResponse response) throws FileNotFoundException {
		Tfile findTfile  = fileService.getById(id);
		//获取路径
		String fullPath = findTfile.getPath();
      //创建本地文件对象
        File downloadFile = new File(fullPath);
        // 请求数据范围字符串
        String range = request.getHeader("Range");
 
        long startByte = 0;
        long endByte = downloadFile.length() - 1;
        if (range != null && range.contains("bytes=") && range.contains("-")) {
            String rangeFormat = range.substring(range.lastIndexOf("=") + 1).trim();
            String ranges[] = rangeFormat.split("-");
            try {
                if (rangeFormat.startsWith("-")) {
                    endByte = Long.parseLong(ranges[1]);
                }
                else if (rangeFormat.endsWith("-")) {
                    startByte = Long.parseLong(ranges[0]);
                }
	            else if (ranges.length == 2) {
	                startByte = Long.parseLong(ranges[0]);
	                endByte = Long.parseLong(ranges[1]);
	            }
            } catch (NumberFormatException e) {
            	e.printStackTrace();
                startByte = 0;
                endByte = downloadFile.length() - 1;
            }
        }
 
        long contentLength = endByte - startByte + 1;
 
        response.setHeader("Accept-Ranges", "bytes");       
        response.setContentType("application/octet-stream");
        //文件名
        String filename = findTfile.getName();
		try {
			if (request.getHeader("User-Agent").contains("MSIE")) {
	            filename=URLEncoder.encode(filename,"UTF-8");
	        }else {
	            filename=new String(filename.getBytes("UTF-8"),"ISO-8859-1");
	        }
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}
        response.setHeader("Content-Disposition",
        		String.format("attachment;filename=\"%s\"", filename));
        response.setHeader("Content-Length", String.valueOf(contentLength));
        if (range != null && range.contains("bytes=") && range.contains("-")) {
            response.setStatus(response.SC_PARTIAL_CONTENT);
            response.setHeader("Content-Range", "bytes " + startByte + "-" + endByte + "/" + downloadFile.length());
        }
        BufferedOutputStream outputStream = null;
        RandomAccessFile randomAccessFile = null;
        long transmitted = 0;
        try {
            randomAccessFile = new RandomAccessFile(downloadFile, "r");
            outputStream = new BufferedOutputStream(response.getOutputStream());
            int bufLen = (int) (contentLength < 2048 ? contentLength : 2048);
            byte[] buff = new byte[4096];
            int len = 0;
            randomAccessFile.seek(startByte);
            while ((transmitted + len) <= contentLength && (len = randomAccessFile.read(buff)) != -1) {
                outputStream.write(buff, 0, len);
                transmitted += len;
            }
            if (transmitted < contentLength) {
                len = randomAccessFile.read(buff, 0, (int) (contentLength - transmitted));
                outputStream.write(buff, 0, len);
                transmitted += len;
            }
 
            outputStream.flush();
            response.flushBuffer();
            randomAccessFile.close();
 
        } catch (ClientAbortException e) {
        
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (randomAccessFile != null) {
                    randomAccessFile.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }