JMF 通过 Applet 获取数据

import java.awt.BorderLayout;import java.awt.Choice;import java.awt.Component;import java.util.Vector; // JMF相关的类import javax.media.CaptureDeviceInfo;import javax.media.CaptureDeviceManager;import javax.media.Format;import javax.media.Manager;import javax.media.MediaLocator;import javax.media.Player;import javax.media.format.VideoFormat;import javax.swing.JPanel;import javax.swing.JApplet;public class VApplet extends JApplet {private JPanel jContentPane = null;private Choice choice = null;public VApplet() {super();}public void init() {this.setSize(320, 240);this.setContentPane(getJContentPane());this.setName("VApplet");}// 取系统所有可采集的硬件设备列表private CaptureDeviceInfo[] getDevices() {Vector devices = CaptureDeviceManager.getDeviceList(null);CaptureDeviceInfo[] info = new CaptureDeviceInfo[devices.size()];for (int i = 0; i < devices.size(); i++) {info[i] = (CaptureDeviceInfo) devices.get(i);}return info;}// 从已知设备中取所有视频设备的列表private CaptureDeviceInfo[] getVideoDevices() {CaptureDeviceInfo[] info = getDevices();CaptureDeviceInfo[] videoDevInfo;Vector vc = new Vector();for (int i = 0; i < info.length; i++) {// 取设备支持的格式，如果有一个是视频格式，则认为此设备为视频设备Format[] fmt = info[i].getFormats();for (int j = 0; j < fmt.length; j++) {if (fmt[j] instanceof VideoFormat) {vc.add(info[i]);}break;}}videoDevInfo = new CaptureDeviceInfo[vc.size()];for (int i = 0; i < vc.size(); i++) {videoDevInfo[i] = (CaptureDeviceInfo) vc.get(i);}return videoDevInfo;}private JPanel getJContentPane() {if (jContentPane == null) {BorderLayout borderLayout = new BorderLayout();jContentPane = new JPanel();jContentPane.setLayout(borderLayout);MediaLocator ml = null;Player player = null;try {// 这里我只有一个视频设备，直接取第一个// 取得当前设备的MediaLocatorml = getVideoDevices()[0].getLocator();// 用已经取得的MediaLocator得到一个Playerplayer = Manager.createRealizedPlayer(ml);player.start();// 取得Player的AWT ComponentComponent comp = player.getVisualComponent();// 如果是音频设备这个方法将返回null,这里要再判断一次if (comp != null) {// 将Component加到窗体jContentPane.add(comp, BorderLayout.EAST);}} catch (Exception e) {e.printStackTrace();}}return jContentPane;}}