刷新servlet jetty java
我有一个来自ip摄像头的视频流,我想通过服务器处理这个流,这样我就可以在尽可能多的设备(如iPad/浏览器)上显示它,因为我需要摄像头只有100Mbit/s,所以很多设备什么都不显示。我有一个jetty http服务器正在运行。我编写了一个类,用于获取流并将其转换为MjpegFrame:刷新servlet jetty java,java,servlets,jetty,Java,Servlets,Jetty,我有一个来自ip摄像头的视频流,我想通过服务器处理这个流,这样我就可以在尽可能多的设备(如iPad/浏览器)上显示它,因为我需要摄像头只有100Mbit/s,所以很多设备什么都不显示。我有一个jetty http服务器正在运行。我编写了一个类,用于获取流并将其转换为MjpegFrame: MjpegFrame = frame; try { MjpegInputStream m = new MjpegInputStream(url.openStream
MjpegFrame = frame;
try {
MjpegInputStream m = new MjpegInputStream(url.openStream());
MjpegFrame f;
while ((f = m.readMjpegFrame()) != null) {
if(!running) break;
frame = f;
}
m.close();
} catch (IOException e) {
//some error outputs
}
获取当前帧
public MjpegFrame getCurrentFrame() {
return frame;
}
这个很好用。现在我试图用Servlet显示它,但这里我只得到一张照片,而不是一个流:
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//String auth = request.getAuthType();
//System.out.println("auth:"+auth);
if(vm != null) {
MjpegFrame frame = vm.getCurrentFrame();
if(frame != null) {
BufferedOutputStream output = null;
try{
output = new BufferedOutputStream(response.getOutputStream(), 1024);
response.reset();
response.setBufferSize(1024);
response.setContentType("image/webp");
response.setHeader("Cache-Control", "max-age=0") ;
response.setHeader("Accept-Encoding", "gzip, deflate, sdch");
while(frame != null){
response.setContentLength(frame.getContentLength());
output.write(frame.getJpegBytes(), 0, frame.getContentLength());
frame = vm.getCurrentFrame();
}
}catch(Exception e){
e.printStackTrace();
}finally {
}
} else {
System.out.println("No image available...");
}
} else {
System.out.println("Error: VideoMultiplier is not set");
}
}
有人知道我的代码有什么问题吗?我自己解决了:
问题是康奈特式的
response.setContentType("image/webp");
我用wireshark对其进行了分析,并意识到反应应该有所不同。不管怎样,这就是我的回答:
String contentType = "multipart/x-mixed-replace; boundary=--yourboundary";
response.setContentType(contentType);
而不是-yourbound,您使用相机的边界,或者,为了使其更灵活,构建您自己的标题:
public StringBuffer createHeader(int contentLength) {
StringBuffer header = new StringBuffer(100);
header.append("--yourboundary\r\nContent-Type: image/jpeg\r\nContent-Length: ");
header.append(contentLength);
header.append("\r\n\r\n");
return header;
}
然后这样写:
frame = vm.getCurrentFrame();//here I get my frame of the current image I wanna send
StringBuffer header = createHeader(frame.getJpegBytes().length);
byte[] headerBytes = header.toString().getBytes();
byte[] imageBytes = frame.getJpegBytes();
// create a newImage array that is the size of the two arrays
byte[] newImage = new byte[headerBytes.length + imageBytes.length];
// copy headerBytes into start of newImage (from pos 0, copy headerBytes.length bytes)
System.arraycopy(headerBytes, 0, newImage, 0, headerBytes.length);
// copy imageBytes into end of newImage (from pos headerBytes.length, copy imageBytes.length bytes)
System.arraycopy(imageBytes, 0, newImage, headerBytes.length, imageBytes.length);
output.write(newImage,0,newImage.length);
output.flush();
希望它能帮助别人。
cheers接受编码不是响应标题。此外,您可能还需要查看Servlet3.1的WriteListener以进行异步响应写入。