前后端分离 java 音频、视频播放 ，快进暂停

response.setHeader("Content-Disposition", String.format("inline; filename=\"%s\"", StringUtil.toEncodedString(fileDescriptionDTO.getName().getBytes(), Charset.forName("ISO-8859-1"))));
List<String> videoTypes= Arrays.asList("mp4","webm","ogg","avi","mov","wmv","rmvb","mkv","m4v","mp3","wma","rm");
        Long startByte = null;
        Long endByte = null;
        Long contentLength = null;
        if (videoTypes.contains(fileDescriptionDTO.getSuffix())){
            //开始下载位置
            startByte = 0L;
            //结束下载位置
            Long fileLength = fileDescriptionDTO.getSize();
            endByte = fileLength - 1;
            log.debug("文件开始位置：{}，文件结束位置：{}，文件总长度：{}", startByte, endByte, fileLength);

            //有range的话
            String range = request.getHeader("Range");
            if (range != null && range.contains("bytes=") && range.contains("-")) {
                range = range.substring(range.lastIndexOf("=") + 1).trim();
                String[] ranges = range.split("-");
                try {
                    //判断range的类型
                    if (ranges.length == 1) {
                        //类型一：bytes=-2343
                        if (range.startsWith("-")) {
                            endByte = Long.parseLong(ranges[0]);
                        }
                        //类型二：bytes=2343-
                        else if (range.endsWith("-")) {
                            startByte = Long.parseLong(ranges[0]);
                        }
                    }
                    //类型三：bytes=22-2343
                    else if (ranges.length == 2) {
                        startByte = Long.parseLong(ranges[0]);
                        endByte = Long.parseLong(ranges[1]);
                    }

                } catch (NumberFormatException e) {
                    startByte = 0L;
                    endByte = fileLength - 1;
                    log.error("Range Occur Error,Message:{}",e.getLocalizedMessage());
                }
            }

            //要下载的长度
            contentLength = endByte - startByte + 1;
            //文件名
            String fileName = fileDescriptionDTO.getName();
            //文件类型
            String contentType = request.getServletContext().getMimeType(fileName);

            // 解决下载文件时文件名乱码问题
            byte[] fileNameBytes = fileName.getBytes(StandardCharsets.UTF_8);
            fileName = new String(fileNameBytes, 0, fileNameBytes.length, StandardCharsets.ISO_8859_1);

            //各种响应头设置
            //支持断点续传，获取部分字节内容：
            response.setHeader("Accept-Ranges", "bytes");
            //http状态码要为206：表示获取部分内容
            response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
            response.setContentType(contentType);
            response.setHeader("Content-Type", contentType);
            //inline表示浏览器直接使用，attachment表示下载，fileName表示下载的文件名
            response.setHeader("Content-Disposition", "inline;filename=" + fileName);
            response.setHeader("Content-Length", String.valueOf(contentLength));
            // Content-Range，格式为：[要下载的开始位置]-[结束位置]/[文件总大小]
            response.setHeader("Content-Range", "bytes " + startByte + "-" + endByte + "/" + fileLength);
        }