jsp中嵌入APPLET 使用jmf 刷新页面时会出现java.io.IOException: Capture device in use

2010-01-27 11:18:43 308 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

计算机网络实验（华为eNSP模拟器）——第十章 Eth-Trunk（链路聚合）目录一、Eth-Trunk的定义二、Eth-Trunk的工作模式（一）LACP模式1、定义2、命令（二）手工负载分担模式1、定义2、命令三、结语一、Eth-Trunk的定义 Eth-Trunk是指设备的链路聚合，即将该设备的多个接口捆绑成一个接口，从而达到了增加带宽和提高可靠性的目的。我们要注意它是将多条物理链路，在逻辑上合并成一条，而不是串在一起。例我们将LSW1交换机S5700的三个端口（即GE0/0/1 、GE0/0/2、GE0/0/3）定义为一个Eth-Trunk接口与LSW2交换机相连，如下：阅读详情

第一次进入页面可以正常显示视屏但是当页面刷新时就会又调用APPLET 驱动又会重新加载但是又不允许重复加载驱动
请问有什么方法可以解决谢谢
错误如下：
MediaNode event thread java.lang.InterruptedException
MediaNode event thread java.lang.InterruptedException
java.io.IOException: Capture device in use
java.io.IOException: Capture device in use
javax.media.NoPlayerException: Error instantiating class: com.sun.media.protocol.vfw.DataSource : java.io.IOException: Capture device in use
at javax.media.Manager.createPlayerForContent(Manager.java:1362)
at javax.media.Manager.createPlayer(Manager.java:417)
at javax.media.Manager.createRealizedPlayer(Manager.java:553)
at AppletTest.AppletTest.getJContentPane(AppletTest.java:106)
at AppletTest.AppletTest.init(AppletTest.java:64)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
java.awt.IllegalComponentStateException: contentPane cannot be set to null.
at javax.swing.JRootPane.setContentPane(Unknown Source)
at javax.swing.JApplet.setContentPane(Unknown Source)
at AppletTest.AppletTest.init(AppletTest.java:64)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
java.lang.ThreadDeath
at java.lang.Thread.stop(Unknown Source)
at java.lang.ThreadGroup.stopOrSuspend(Unknown Source)
at java.lang.ThreadGroup.stop(Unknown Source)
at sun.awt.AppContext.dispose(Unknown Source)
at sun.applet.AppletClassLoader.release(Unknown Source)
at sun.plugin.security.PluginClassLoader.release(Unknown Source)
at sun.applet.AppletPanel.release(Unknown Source)
at sun.applet.AppletPanel.sendEvent(Unknown Source)
at sun.plugin.AppletViewer.onPrivateClose(Unknown Source)
at sun.plugin.AppletViewer$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

代码如下：

private CaptureDeviceInfo[] getDevices() { //得到所有驱动
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;
}
private CaptureDeviceInfo[] getVideoDevices() { //筛选视屏驱动

CaptureDeviceInfo[] info = getDevices();
CaptureDeviceInfo[] videoDevInfo;
Vector vc = new Vector();
for (int i = 0; i < info.length; i++) {
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() { //把驱动加载到player中
DataSource videoDataSource=null;
if (jContentPane == null) {
BorderLayout borderLayout = new BorderLayout();
jContentPane = new JPanel();
jContentPane.setLayout(borderLayout);
MediaLocator ml = null;
try{
if (getVideoDevices()[0] != null) {
ml = getVideoDevices()[0].getLocator();
player = Manager.createRealizedPlayer(ml);
player.start();
Component comp = player.getVisualComponent();
if (comp != null){
jContentPane.add(comp, BorderLayout.CENTER);
}
else
{
message="111";
return null;
}
}
else
{
message="222";
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
return jContentPane;
}

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