我正在尝试将 ip camera 中的视频捕获到我的应用程序中，但它给出了异常
com.sun.image.codec.jpeg.ImageFormatException: Not a JPEG file: starts with 0x0d 0x0a
at sun.awt.image.codec.JPEGImageDecoderImpl.readJPEGStream(Native Method)
at sun.awt.image.codec.JPEGImageDecoderImpl.decodeAsBufferedImage(Unknown Source)
at test.AxisCamera1.readJPG(AxisCamera1.java:130)
at test.AxisCamera1.readMJPGStream(AxisCamera1.java:121)
at test.AxisCamera1.readStream(AxisCamera1.java:100)
at test.AxisCamera1.run(AxisCamera1.java:171)
at java.lang.Thread.run(Unknown Source)
它在 image = decoder.decodeAsBufferedImage(); 处给出异常；
这是我正在尝试的代码
private static final long serialVersionUID = 1L;
public boolean useMJPGStream = true;
public String jpgURL = "http://ip here/video.cgi/jpg/image.cgi?resolution=640×480";
public String mjpgURL = "http://ip here /video.cgi/mjpg/video.cgi?resolution=640×480";
DataInputStream dis;
private BufferedImage image = null;
public Dimension imageSize = null;
public boolean connected = false;
private boolean initCompleted = false;
HttpURLConnection huc = null;
Component parent;
/** Creates a new instance of AxisCamera */
public AxisCamera1(Component parent_) {
parent = parent_;
}
public void connect() {
try {
URL u = new URL(useMJPGStream ? mjpgURL : jpgURL);
huc = (HttpURLConnection) u.openConnection();
// System.out.println(huc.getContentType());
InputStream is = huc.getInputStream();
connected = true;
BufferedInputStream bis = new BufferedInputStream(is);
dis = new DataInputStream(bis);
if (!initCompleted)
initDisplay();
} catch (IOException e) { // incase no connection exists wait and try
// again, instead of printing the error
try {
huc.disconnect();
Thread.sleep(60);
} catch (InterruptedException ie) {
huc.disconnect();
connect();
}
connect();
} catch (Exception e) {
;
}
}
public void initDisplay() { // setup the display
if (useMJPGStream)
readMJPGStream();
else {
readJPG();
disconnect();
}
imageSize = new Dimension(image.getWidth(this), image.getHeight(this));
setPreferredSize(imageSize);
parent.setSize(imageSize);
parent.validate();
initCompleted = true;
}
public void disconnect() {
try {
if (connected) {
dis.close();
connected = false;
}
} catch (Exception e) {
;
}
}
public void paint(Graphics g) { // used to set the image on the panel
if (image != null)
g.drawImage(image, 0, 0, this);
}
public void readStream() { // the basic method to continuously read the
// stream
try {
if (useMJPGStream) {
while (true) {
readMJPGStream();
parent.repaint();
}
} else {
while (true) {
connect();
readJPG();
parent.repaint();
disconnect();
}
}
} catch (Exception e) {
;
}
}
public void readMJPGStream() { // preprocess the mjpg stream to remove the
// mjpg encapsulation
readLine(3, dis); // discard the first 3 lines
readJPG();
readLine(2, dis); // discard the last two lines
}
public void readJPG() { // read the embedded jpeg image
try {
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(dis);
image = decoder.decodeAsBufferedImage();
} catch (Exception e) {
e.printStackTrace();
disconnect();
}
}
public void readLine(int n, DataInputStream dis) { // used to strip out the
// header lines
for (int i = 0; i < n; i++) {
readLine(dis);
}
}
public void readLine(DataInputStream dis) {
try {
boolean end = false;
String lineEnd = "\n"; // assumes that the end of the line is marked
// with this
byte[] lineEndBytes = lineEnd.getBytes();
byte[] byteBuf = new byte[lineEndBytes.length];
while (!end) {
dis.read(byteBuf, 0, lineEndBytes.length);
String t = new String(byteBuf);
System.out.print(t); // uncomment if you want to see what the
// lines actually look like
if (t.equals(lineEnd))
end = true;
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void run() {
System.out.println("in Run...................");
connect();
readStream();
}
@SuppressWarnings("deprecation")
public static void main(String[] args) {
JFrame jframe = new JFrame();
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
AxisCamera1 axPanel = new AxisCamera1(jframe);
new Thread(axPanel).start();
jframe.getContentPane().add(axPanel);
jframe.pack();
jframe.show();
}
}
有什么建议我在这里做错了吗？