ola pessoal, estou tentando acessar um arquivo .txt via java web start, para edita-lo …
mas quando executo, da o seguinte erro :
Exception in thread “AWT-EventQueue-0” java.security.AccessControlException: access denied (java.io.FilePermission arquivo.txt read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at java.io.RandomAccessFile.<init>(Unknown Source)
at _escreverAA.<init>(_escreverAA.java:12)
at Acesso$1.actionPerformed(Acesso.java:23)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.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.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
segue meu codigo (quando executo pelo eclipse funciona, qunado crio o .jar e clico 2 vezes, tambem, so nao funciona na web … ) :
import java.io.*;
import javax.swing.JOptionPane;
public class _navegarAA {
private static RandomAccessFile arquivo;
public _navegarAA() {
try {
arquivo = new RandomAccessFile(new File(“arquivo.txt”), “rw”);
JOptionPane.showMessageDialog(null, “acho arquivo”, “”, JOptionPane.ERROR_MESSAGE);
} catch (FileNotFoundException e) {
JOptionPane.showMessageDialog(null, e.getMessage(), “erro 1 nao acho”, JOptionPane.ERROR_MESSAGE);
}
try {
arquivo.seek(0);
arquivo.seek(12);
JOptionPane.showMessageDialog(null, “leo arquivo”, “”, JOptionPane.ERROR_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, e.getMessage(), “erro 2 nao leo”, JOptionPane.ERROR_MESSAGE);
}
try {
arquivo.seek(12);
arquivo.writeChar(‘X’);
arquivo.seek(12);
JOptionPane.showMessageDialog(null, “navego arquivo”, “”, JOptionPane.ERROR_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, e.getMessage(), “erro 2 nao navego”, JOptionPane.ERROR_MESSAGE);
}
}
}
