第一种：继承SpringMVC的ResourceHttpRequestHandler，重写getResource方法，将请求交给这个handler处理
第二种：自己处理response
推荐第一种方法，够简单
第一种方法
继承ResourceHttpRequestHandler
@Component
public class VideoResourceHttpRequestHandler extends ResourceHttpRequestHandler {
@Override
protected Resource getResource(HttpServletRequest request) throws IOException {
//todo 拿到音视频的路径或文件
String path = "某个路径";
return new FileSystemResource(path);
}
}
转发请求给Handler处理
@RestController
@RequestMapping("video")
public class VideoController {
@Autowired
private VideoResourceHttpRequestHandler videoResourceHttpRequestHandler;
@GetMapping("/play/{id}")
public void play(@PathVariable Long id, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
videoResourceHttpRequestHandler.handleRequest(request, response);
}
}
第二种方法：手动处理
@RestController
@RequestMapping("video")
public class VideoController {
@GetMapping("/play1/{id}")
public void play1(@PathVariable Long id, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = "视频路径";
}
private void fileChunkDownload(String filePath, String fileName, HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
String range = request.getHeader("Range");
File file = new File(filePath);
//开始下载位置
long startByte = 0;
//结束下载位置
long endByte = file.length() - 1;
//有range的话
if (range != null && range.contains("bytes=") && range.contains("-")) {
range = range.substring(range.lastIndexOf("=") + 1).trim();
String[] ranges = range.split("-");
try {
//判断range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 = 0;
endByte = file.length() - 1;
}
}
//要下载的长度
long contentLength = endByte - startByte + 1;
//文件类型
String contentType = request.getServletContext().getMimeType(fileName);
//防止文件名乱码
String downloadFileName = URLEncoder.encode(fileName, "UTF-8");
//设置响应头
response.setHeader("Accept-Ranges", "bytes");
//http状态码206
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
response.setContentType(contentType);
response.setHeader("Content-Type", contentType);
response.setHeader("Content-Disposition", "attachment;filename=" + downloadFileName);
response.setHeader("Content-Length", String.valueOf(contentLength));
//跨域必须设置该属性
response.setHeader("Access-Control-Expose-Headers", "Content-Range");
//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 + "/" + file.length());
//已传送数据大小
long transmitted = 0;
try(BufferedOutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");) {
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;
}
//处理不足buff.length部分
if (transmitted < contentLength) {
len = randomAccessFile.read(buff ,0,(int)(contentLength-transmitted));
outputStream.write(buff,0,len);
transmitted += len;
}
} catch (IOException e) {
//IO错误
}
}
}
