[英]Servlet Video streaming, but the video is not showing, audio is working
所以我正在编写一个java ee后端,我可以存储图片或视频,我希望以html5 <video>标签的方式将视频从后端流式传输到客户端(互联网浏览器)。视频部分是当我播放视频但音频正在播放时,它只是给我一个黑屏 。 图像部分运行良好。
import com.dispway.restserver.facade.PlaylistEntryFacade;
import com.dispway.restserver.smallModel.SmallPlaylistEntry;
import javax.ejb.EJB;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
@WebServlet("entry")
public class PlaylistEntryServlet extends HttpServlet {
@EJB
PlaylistEntryFacade playlistEntryFacade;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//entry-id
String e_id = req.getParameter("e_id");
//entry-type
String type = req.getParameter("type");
SmallPlaylistEntry entry = playlistEntryFacade.findById(Integer.parseInt(e_id));
ServletContext context = getServletContext();
String mimeType;
ServletOutputStream outputStream;
switch (type) {
case "1":
System.out.println("image-type");
mimeType = context.getMimeType(entry.getFilename());
if (mimeType == null) {
mimeType = "image/png";
}
resp.setContentType(mimeType);
outputStream = resp.getOutputStream();
outputStream.write(entry.getFile());
outputStream.close();
break;
case "2":
// NOT WORKING, I only get BlackScreen
System.out.println("video-type");
System.out.println(entry.getFilename());
mimeType = context.getMimeType(entry.getFilename());
if (mimeType == null) {
System.out.println("mime is null");
mimeType = "video/mp4";
}
System.out.println("MimeType: " + mimeType);
resp.setContentType(mimeType);
resp.setContentLength(entry.getFile().length);
//getFile returns a byte[]
BufferedInputStream bufferedInputStream = new BufferedInputStream(new ByteArrayInputStream(entry.getFile()));
byte[] content = new byte[4096];
int bytesRead;
outputStream = resp.getOutputStream();
while ((bytesRead = bufferedInputStream.read(content)) != -1) {
outputStream.write(content, 0, bytesRead);
}
bufferedInputStream.close();
outputStream.close();
break;
}
}
}
抱歉视频的编解码器错误,因此html <video>
没有显示视频。
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