Applet write file and policy file : Security Applet « Security « Java

1. Java
2. Security
3. Security Applet

Applet write file and policy file

/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */
/**
 * By default, this applet raises a security exception, unless you configure
 * your policy to allow applets from its location to write to the file
 * "writetest".
 */

import java.applet.Applet;
import java.awt.Graphics;
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class WriteFile extends Applet {
  String myFile = "writetest";

  File f = new File(myFile);

  DataOutputStream dos;

  public void init() {

    String osname = System.getProperty("os.name");
  }

  public void paint(Graphics g) {
    try {
      dos = new DataOutputStream(new BufferedOutputStream(
          new FileOutputStream(myFile), 128));
      dos.writeChars("Cats can hypnotize you when you least expect it\n");
      dos.flush();
      g.drawString("Successfully wrote to the file named " + myFile
          + " -- go take a look at it!", 10, 10);
    } catch (SecurityException e) {
      g.drawString("writeFile: caught security exception: " + e, 10, 10);
    } catch (IOException ioe) {
      g.drawString("writeFile: caught i/o exception", 10, 10);
    }
  }
}


           
       

Related examples in the same category