这是在Java Console中的错误提示!Exception occurred during event dispatching:java.lang.NullPointerException at mediaplayer.FrmShow.<init>(FrmShow.java:34) at mediaplayer.MediaPlayer.jMenuItem1_actionPerformed(MediaPlayer.java:237) at mediaplayer.MediaPlayer$2.actionPerformed(MediaPlayer.java:90) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.AbstractButton.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)
void jMenuItem1_actionPerformed(ActionEvent e) {
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, new Boolean(true));
Player player = null;
String mediaFile;
mediaFile="http://123.2.2.2/media/movie/test.mpg";
URL url = null;
try {
if ((url = new URL(mediaFile)) == null) {
return;
}
}
catch(Exception ee)
{}try {
player = Manager.createRealizedPlayer(url);
} catch (Exception ew) {
}
FrmShow t=new FrmShow(player,"show");
JMFDesktop desktop=new JMFDesktop(); 'Panel类
this.getContentPane() .add(desktop);
desktop.add(t);
t.show();
}
'以上程序放在Japplet的菜单事件中
package mediaplayer;
import javax.media.*;
import com.sun.media.ui.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.Vector;
import java.awt.*;
import javax.swing.JInternalFrame;class JMFrmShow extends JInternalFrame implements ControllerListener {
Player mplayer;
Component visual = null;
Component control = null;
int videoWidth = 0;
int videoHeight = 0;
int controlHeight = 30;
int insetWidth = 10;
int insetHeight = 30;
boolean firstTime = true;
public JMFrmShow(){
}
public JMFrmShow(Player player, String title) {
super(title, true, true, true, true);
getContentPane().setLayout( new BorderLayout() );
setSize(320, 10);
setLocation(50, 50);
setVisible(true);
mplayer = player;
mplayer.addControllerListener((ControllerListener) this);
mplayer.realize();
addInternalFrameListener( new InternalFrameAdapter() {
public void internalFrameClosing(InternalFrameEvent ife) {
mplayer.close();
}
} ); } public void controllerUpdate(ControllerEvent ce) {
if (ce instanceof RealizeCompleteEvent) {
mplayer.prefetch();
} else if (ce instanceof PrefetchCompleteEvent) {
if (visual != null)
return; if ((visual = mplayer.getVisualComponent()) != null) {
Dimension size = visual.getPreferredSize();
videoWidth = size.width;
videoHeight = size.height;
getContentPane().add("Center", visual);
} else
videoWidth = 320;
if ((control = mplayer.getControlPanelComponent()) != null) {
controlHeight = control.getPreferredSize().height;
getContentPane().add("South", control);
}
setSize(videoWidth + insetWidth,
videoHeight + controlHeight + insetHeight);
validate();
mplayer.start();
} else if (ce instanceof EndOfMediaEvent) {
mplayer.setMediaTime(new Time(0));
mplayer.start();
}
}
}
帮忙看看!
void jMenuItem1_actionPerformed(ActionEvent e) {
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, new Boolean(true));
Player player = null;
String mediaFile;
mediaFile="http://123.2.2.2/media/movie/test.mpg";
URL url = null;
try {
if ((url = new URL(mediaFile)) == null) {
return;
}
}
catch(Exception ee)
{}try {
player = Manager.createRealizedPlayer(url);
} catch (Exception ew) {
}
FrmShow t=new FrmShow(player,"show");
JMFDesktop desktop=new JMFDesktop(); 'Panel类
this.getContentPane() .add(desktop);
desktop.add(t);
t.show();
}
'以上程序放在Japplet的菜单事件中
package mediaplayer;
import javax.media.*;
import com.sun.media.ui.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.Vector;
import java.awt.*;
import javax.swing.JInternalFrame;class JMFrmShow extends JInternalFrame implements ControllerListener {
Player mplayer;
Component visual = null;
Component control = null;
int videoWidth = 0;
int videoHeight = 0;
int controlHeight = 30;
int insetWidth = 10;
int insetHeight = 30;
boolean firstTime = true;
public JMFrmShow(){
}
public JMFrmShow(Player player, String title) {
super(title, true, true, true, true);
getContentPane().setLayout( new BorderLayout() );
setSize(320, 10);
setLocation(50, 50);
setVisible(true);
mplayer = player;
mplayer.addControllerListener((ControllerListener) this);
mplayer.realize();
addInternalFrameListener( new InternalFrameAdapter() {
public void internalFrameClosing(InternalFrameEvent ife) {
mplayer.close();
}
} ); } public void controllerUpdate(ControllerEvent ce) {
if (ce instanceof RealizeCompleteEvent) {
mplayer.prefetch();
} else if (ce instanceof PrefetchCompleteEvent) {
if (visual != null)
return; if ((visual = mplayer.getVisualComponent()) != null) {
Dimension size = visual.getPreferredSize();
videoWidth = size.width;
videoHeight = size.height;
getContentPane().add("Center", visual);
} else
videoWidth = 320;
if ((control = mplayer.getControlPanelComponent()) != null) {
controlHeight = control.getPreferredSize().height;
getContentPane().add("South", control);
}
setSize(videoWidth + insetWidth,
videoHeight + controlHeight + insetHeight);
validate();
mplayer.start();
} else if (ce instanceof EndOfMediaEvent) {
mplayer.setMediaTime(new Time(0));
mplayer.start();
}
}
}
帮忙看看!