使用206狀態碼實現斷點續傳（俗稱拖進度條）
設置maxSize實現分片上傳
直接上代碼！

@GetMapping("/t1.jspx")public void video(HttpServletRequest request, HttpServletResponse response) throws IOException {// 表示這是視頻文件response.setContentType("video/mp4");String range = request.getHeader("Range");// 第一次請求時range為nullif(range == null){response.setHeader("Accept-Ranges", "bytes");response.addHeader("Content-Disposition", "inline;filename=" + fileName);return;}// 如果有range，就請求數據（path和filenName為預先定義好的）File file = new File(path + "\\" + fileName);FileInputStream fileInputStream = new FileInputStream(file);ServletOutputStream out = response.getOutputStream();int contentLength = fileInputStream.available();// 獲取起止，end默認為0int start = 0, end = 0;if(range.startsWith("bytes=")){String[] values = range.split("=")[1].split("-");start = Integer.parseInt(values[0]);if(values.length > 1){end = Integer.parseInt(values[1]);}}//斷點續傳 206response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);// 每次傳遞實際長度long length = 0;// 允許的最大長度long maxSize = 1024L * 1024L;if(end > 0){// 一般不會這樣length = end - start + 1;response.setHeader("Content-length", "" + length);response.setHeader("Content-Range", "bytes " + start + "-" + end + "/" + contentLength);}else{// 大部分情況end為0length = ((contentLength - start) > maxSize) ? maxSize : (contentLength - start);response.setHeader("Content-length", "" + length);response.setHeader("Content-Range", "bytes "+ start + "-" + (start + length - 1) + "/" + contentLength);}// 將數據截取并存入byte[]數組中byte[] data = new byte[(int)length];fileInputStream.skip(start);fileInputStream.read(data);// 取出要傳給前端的有效數據out.write(data);out.close();fileInputStream.close();}

總結

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