Ciao a tutti,
vorrei realizzare un piccolo programmino in java che mi permetta di visualizzare i dati ricevuti in streaming da una camera ip.
Per simulare la camera ip, utilizzo un programmino sul mio cel android che mi permette di ricevere via http lo streaming video dalla cam integrata nel telefono (es http:\\ip:
ort). Come posso fare a decodificare quello che ricevo da http e visualizzarlo sul mio computer tramite un'applicazione java? Devo utilizzare qualche libreria specifica?
In rete ho trovato un esempio però utilizza la jdk6 con delle api della SUN, quindi non più utilizzate nella jdk7. Qualcuno ha qualche suggerimento da darmi?? Grazie mille!!! 
codice:
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class AxisCamera1 extends JPanel implements Runnable {
public boolean useMJPGStream = true; // still image set to false
public String mjpgURL = "http://user:passWord@monIp:port/videostream.cgi";
DataInputStream dis;
private BufferedImage image = null;
int counter = 0;
public Dimension imageSize = null;
public boolean connected = false;
private boolean initCompleted = false;
HttpURLConnection huc = null;
Component parent;
/** Creates a new instance of AxisCamera1 */
public AxisCamera1(Component parent_) {
parent = parent_;
}
public static Image getScaledInstanceAWT(BufferedImage source, double factor) {
int w = (int) (source.getWidth() * factor);
int h = (int) (source.getHeight() * factor);
return source.getScaledInstance(w, h, Image.SCALE_SMOOTH);
}
public static BufferedImage toBufferedImage(Image image) {
new ImageIcon(image); // load image
int w = image.getWidth(null);
int h = image.getHeight(null);
BufferedImage bimage = new BufferedImage(w, h,
BufferedImage.TYPE_BYTE_INDEXED);
// BufferedImage bimage =
// getDefaultConfiguration().createCompatibleImage(w, h,
// Transparency.OPAQUE);
Graphics2D g = bimage.createGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
return bimage;
}
public void connect() {
try {
URL u = new URL(mjpgURL);
huc = (HttpURLConnection) u.openConnection();
// System.out.println("huc="+huc);
System.out.println(huc.getInputStream());
InputStream is = huc.getInputStream();
// System.out.println("is="+is);
connected = true;
BufferedInputStream bis = new BufferedInputStream(is);
// System.out.println("bis="+bis);
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(4, dis); // discard the first 3 lines
readJPG();
readLine(1, dis); // discard the last two lines
}
public void readJPG() { // read the embedded jpeg image
try {
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(dis);
image = decoder.decodeAsBufferedImage();
String s = "a" + counter + ".jpg";
counter++;
String filename = "c:\\find_stillset\\" + s;
System.out.println(filename);
BufferedImage smaller = toBufferedImage(getScaledInstanceAWT(image,
1.0 / 3.0));// scalling image size
try {
OutputStream out = new FileOutputStream(filename);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(smaller);
out.close();
} catch (Exception e) {
System.out.println(e);
}
} 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();
}
public static void main(String[] args) {
// System.setProperty("http.proxyHost","proxy.tp.edu.sg");
// System.setProperty("http.proxyPort","80");
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();
}
}
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