hier de code:
de precieze error:SPOILER
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280import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
import java.awt.Desktop;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.net.URL;
import java.net.URLConnection;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* NewJFrame.java
*
* Created on 21-mrt-2011, 16:33:15
*/
/**
*
* @author Aron
*/
public class NewJFrame extends javax.swing.JFrame {
/** Creates new form NewJFrame */
private java.io.File doelBestand;
private String url;
private URLConnection connection;
public NewJFrame() {
initComponents();
try {
doelBestand = File.createTempFile("OOP", ".temp");
} catch (IOException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
setURL(JOptionPane.showInputDialog("Voer de download URL in"));
mapopenenbutton.setEnabled(false);
}
public void setURL(String url) {
downloadURL.setText(url);
this.url = url;
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
sluitencheckbox = new javax.swing.JCheckBox();
jProgressBar1 = new javax.swing.JProgressBar();
startbutton = new javax.swing.JButton();
mapopenenbutton = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
downloadURL = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
resttijd = new javax.swing.JLabel();
directory = new javax.swing.JLabel();
snelheid = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
sluitencheckbox.setText("Dit programma sluiten nadat de download is voltooid");
sluitencheckbox.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sluitencheckboxActionPerformed(evt);
}
});
jProgressBar1.setForeground(new java.awt.Color(255, 51, 0));
startbutton.setText("Start");
startbutton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
startbuttonActionPerformed(evt);
}
});
mapopenenbutton.setText("Map openen");
mapopenenbutton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mapopenenbuttonActionPerformed(evt);
}
});
jLabel1.setText("Bezig met downloaden:");
jLabel2.setText("Resterende tijd circa:");
downloadURL.setText("jLabel3");
jLabel4.setText("Downloaden naar:");
jLabel5.setText("Overdrachtssnelheid:");
resttijd.setText("jLabel6");
snelheid.setText("jLabel8");
jLabel9.setText("seconden");
jLabel10.setText("KBps");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jProgressBar1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 522, Short.MAX_VALUE)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 334, Short.MAX_VALUE)
.addComponent(mapopenenbutton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(startbutton, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(downloadURL, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 497, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(sluitencheckbox, javax.swing.GroupLayout.PREFERRED_SIZE, 385, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(directory))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel5)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(snelheid))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(resttijd, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel9)
.addComponent(jLabel10)))
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 217, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
);
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {mapopenenbutton, startbutton});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(downloadURL)
.addGap(18, 18, 18)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(resttijd, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel9))
.addGap(4, 4, 4)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(directory))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5)
.addComponent(snelheid)
.addComponent(jLabel10))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 29, Short.MAX_VALUE)
.addComponent(sluitencheckbox)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(startbutton)
.addComponent(mapopenenbutton))
.addContainerGap())
);
pack();
}// </editor-fold>
private void sluitencheckboxActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void startbuttonActionPerformed(java.awt.event.ActionEvent evt) {
startbutton.setText("Annuleren");
try {
URL myUrl = new URL(url);
myUrl.openConnection();
} catch (MalformedURLException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
BufferedOutputStream outputStream = null;
try {
// Buffered streams zijn sneller, maar je kunt ze
// vervangen door normale input en output streams.
BufferedInputStream inputStream = new BufferedInputStream(connection.getInputStream());
outputStream = new BufferedOutputStream(
new FileOutputStream(doelBestand));
while (true) {
int b = inputStream.read();
if (b == -1 || Thread.interrupted()) {
break; // -1 betekent end-of-stream, stoppen
}
outputStream.write(b);
}
} catch(IOException ex) {
System.err.println("Probleem met downloaden van bestand.");
ex.printStackTrace(System.err);
} finally { // Altijd de streams sluiten
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException ex) { /* deze kunnen we negeren */ }
try {
if (connection != null) {
connection.getInputStream().close();
}
} catch (IOException ex) { /* deze kunnen we negeren */ }
}
}
private void mapopenenbuttonActionPerformed(java.awt.event.ActionEvent evt) {
Desktop desktop = Desktop.getDesktop();
File map = doelBestand.getParentFile();
map.isDirectory();
try {
desktop.open(map);
} catch (IOException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel directory;
private javax.swing.JLabel downloadURL;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel9;
private javax.swing.JProgressBar jProgressBar1;
private javax.swing.JButton mapopenenbutton;
private javax.swing.JLabel resttijd;
private javax.swing.JCheckBox sluitencheckbox;
private javax.swing.JLabel snelheid;
private javax.swing.JButton startbutton;
// End of variables declaration
}
Iemand enig idee hoe dit op te lossen?SPOILERException in thread "AWT-EventQueue-0" java.lang.NullPointerException
at NewJFrame.startbuttonActionPerformed(NewJFrame.java:213)
at NewJFrame.access$100(NewJFrame.java:29)
at NewJFrame$2.actionPerformed(NewJFrame.java:90)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6267)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6032)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Je hebt natuurlijk gelijk, maar ik kom er zelf niet uit.quote:Op dinsdag 29 maart 2011 14:22 schreef LompeHork het volgende:
Ik zie wat je fout doet, maar het is voor school, dus zoek het lekker zelf uit. Pauper.
Bouw zelf eerst maar eens wat en begin van scratch af.
Dit is allemaal aangeleverd in de opdracht, dit moeten we gebruiken.quote:Op dinsdag 29 maart 2011 14:23 schreef fonsoy het volgende:
Meuk van internet plukken
Hier heb ik iets aan, thanks voor de hint, nu heb ik weer een aanknopingspunt.quote:
De variable connection wordt nergens gevuld, die moet je waarschijnlijk op regel 200 vullen.
weer een stapje verder
[ Bericht 11% gewijzigd door Verbodsbord op 29-03-2011 15:00:08 ]