# Java Security Question - Applets

Cere (cere@mindspring.com)
Mon, 12 Apr 1999 13:20:44 -0700

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    From: "Cere" <cere@mindspring.com>

    To: "JDK (Net)" <java-net@java.sun.com>,

    Subject: Java Security Question - Applets

    Date: Mon, 12 Apr 1999 13:20:44 -0700

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I am just beginning to learn Java programming, and i have been working =
with JDK 1.2.
I want to eventually be able to make a telnet applet that allows you to =
telnet to places,=20
via a web page. My first 'step' in making something, dealing with =
java.net.*; has me
very frustrated. My program is a simple applet, that grabs the 'ip' =
address of the host name
you input to the applet. However, i am coming up with a Security error =
on this. And i don't
know how to get around it, or what i am doing wrong.=20

If this program doesn't work, how in the world would i be able to =
connect to a telnet=20
connection over the web ? via an applet ?

I have included my java file with this letter, so you may better assist =
me with my problem.

Thankyou for your time.

Arathena

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
I am just beginning to learn Java = programming,=20 and i have been working with JDK 1.2.
I want to eventually be able to make = a telnet=20 applet that allows you to telnet to places,
via a web page. My first 'step' in = making=20 something, dealing with java.net.*; has me
very frustrated. My program is a = simple applet,=20 that grabs the 'ip' address of the host name
you input to the applet. However, i = am coming up=20 with a Security error on this. And i don't
know how to get around it, or what i = am doing=20 wrong.
If this program doesn't work, how in = the world=20 would i be able to connect to a telnet
connection over the web ? via an = applet=20 ?
I have included my java file with = this letter,=20 so you may better assist me with my problem.
Thankyou for your time.
Arathena
------=_NextPart_001_001F_01BE84E7.45358600-- ------=_NextPart_000_001E_01BE84E7.45358600 Content-Type: application/octet-stream; name="IpAddress2.java" Content-Disposition: attachment; filename="IpAddress2.java" X-Sun-Content-Length: 1216 // Programmer: Arathena // Purpose: Applet that finds an ip address from a host // Date: 4/10/99 import java.awt.*; import java.applet.*; import java.awt.event.*; import java.net.*; /** **/ public class IpAddress2 extends Applet implements ActionListener { InetAddress Address; TextArea textarea; TextField textfield; String ip; public void init() { textfield = new TextField(20); add(textfield); textfield.addActionListener(this); textarea = new TextArea(10,40); add(textarea); } // End of init public void actionPerformed(ActionEvent e) { try { ip = textfield.getText(); System.out.println(ip); Address = InetAddress.getByName(ip); System.out.println(Address); textarea.append(Address.toString()+"\n"); textfield.setText(""); repaint(); } catch(UnknownHostException u) { String err = u.toString(); System.out.println( err ); System.out.println("Unknown host"); } catch (SecurityException s) { String err = s.toString(); System.out.println( err ); System.out.println("SECURITY ERROR - DENIED!"); } } // End of actionPerformed() } // End of IpAddress2() class ------=_NextPart_000_001E_01BE84E7.45358600--

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