使用Java后端接口实现视频流返回，利用video组件进行视频播放，并实现视频的分段下载
最编程
2024-01-04 22:42:22
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//path为本地文件路劲
public void play(String path, HttpServletRequest request, HttpServletResponse response) {
RandomAccessFile targetFile = null;
OutputStream outputStream = null;
try {
outputStream = response.getOutputStream();
response.reset();
//获取请求头中Range的值
String rangeString = request.getHeader(HttpHeaders.RANGE);
//打开文件
File file = new File(path);
if (file.exists()) {
//使用RandomAccessFile读取文件
targetFile = new RandomAccessFile(file, "r");
long fileLength = targetFile.length();
long requestSize = (int) fileLength;
//分段下载视频
if (StringUtils.hasText(rangeString)) {
//从Range中提取需要获取数据的开始和结束位置
long requestStart = 0, requestEnd = 0;
String[] ranges = rangeString.split("=");
if (ranges.length > 1) {
String[] rangeDatas = ranges[1].split("-");
requestStart = Integer.parseInt(rangeDatas[0]);
if (rangeDatas.length > 1) {
requestEnd = Integer.parseInt(rangeDatas[1]);
}
}
if (requestEnd != 0 && requestEnd > requestStart) {
requestSize = requestEnd - requestStart + 1;
}
//根据协议设置请求头
response.setHeader(HttpHeaders.ACCEPT_RANGES, "bytes");
response.setHeader(HttpHeaders.CONTENT_TYPE, "video/mp4");
if (!StringUtils.hasText(rangeString)) {
response.setHeader(HttpHeaders.CONTENT_LENGTH, fileLength + "");
} else {
long length;
if (requestEnd > 0) {
length = requestEnd - requestStart + 1;
response.setHeader(HttpHeaders.CONTENT_LENGTH, "" + length);
response.setHeader(HttpHeaders.CONTENT_RANGE, "bytes " + requestStart + "-" + requestEnd + "/" + fileLength);
} else {
length = fileLength - requestStart;
response.setHeader(HttpHeaders.CONTENT_LENGTH, "" + length);
response.setHeader(HttpHeaders.CONTENT_RANGE, "bytes " + requestStart + "-" + (fileLength - 1) + "/"
+ fileLength);
}
}
//断点传输下载视频返回206
response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
//设置targetFile，从自定义位置开始读取数据
targetFile.seek(requestStart);
} else {
//如果Range为空则下载整个视频
response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=test.mp4");
//设置文件长度
response.setHeader(HttpHeaders.CONTENT_LENGTH, String.valueOf(fileLength));
}
//从磁盘读取数据流返回
byte[] cache = new byte[4096];
try {
while (requestSize > 0) {
int len = targetFile.read(cache);
if (requestSize < cache.length) {
outputStream.write(cache, 0, (int) requestSize);
} else {
outputStream.write(cache, 0, len);
if (len < cache.length) {
break;
}
}
requestSize -= cache.length;
}
} catch (IOException e) {
// tomcat原话。写操作IO异常几乎总是由于客户端主动关闭连接导致，所以直接吃掉异常打日志
//比如使用video播放视频时经常会发送Range为0- 的范围只是为了获取视频大小，之后就中断连接了
log.info(e.getMessage());
}
} else {
throw new RuntimeException("文件路劲有误");
}
outputStream.flush();
} catch (Exception e) {
log.error("文件传输错误", e);
throw new RuntimeException("文件传输错误");
}finally {
if(outputStream != null){
try {
outputStream.close();
} catch (IOException e) {
log.error("流释放错误", e);
}
}
if(targetFile != null){
try {
targetFile.close();
} catch (IOException e) {
log.error("文件流释放错误", e);
}
}
}
}