加工后

package com.window;
//先要安装JMF最新版
import java.awt.BorderLayout;
import java.awt.Choice;
import java.awt.Component;
import java.util.Vector;
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.JApplet;
import javax.swing.JPanel;



public class PaiClass extends JApplet {
private JPanel jContentPane = null;
private Choice choice = null;

public PaiClass() {
    super();
}
public void init() {
    this.setSize(640, 480);
    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();
    System.out.println("设备数:"+info.length);
    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();
        System.out.println("fmt.length="+fmt.length);
        for (int j = 0; j < fmt.length; j++) {
            if (fmt[j] instanceof VideoFormat) {
                System.out.println("fmt[j] "+fmt[j]);
                vc.add(info[i]);
            }
            break;
         }
     }
    videoDevInfo = new CaptureDeviceInfo[vc.size()];
    for (int i = 0; i < vc.size(); i++) {
        videoDevInfo[i] = (CaptureDeviceInfo) vc.get(i);
    }
    System.out.println("videoDevInfo "+videoDevInfo.length);
    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
            // 取得当备的MediaLocator
            ml = getVideoDevices()[0].getLocator();
            // 用已经取得的MediaLocator得到一个Player
            player = Manager.createRealizedPlayer(ml);
            player.start();
            // 取得Player的AWT Component
            Component 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;
    }
}