//
// ************************ Security Warning! ************************
// This is a serious warning, and you need to pay attention to it.
//
// To work, this program needs you to put your ftp password into the
// code as a String. This is only appropriate on an Intranet or when
// the applet is on a page to which access is otherwise controlled.
//
// A malicious person could access the applet class file and easily
// retrieve YOUR password. Then they would have access to your ftp
// account. They could add, delete, or change files. They could even
// change the password. That would be very bad for you.
//
// Giving away your password is frequently not allowed by the terms of
// your account provider. Do NOT use this program unless you are
// authorized to pass on your ftp password, and you are able to firewall
// the ftp account or otherwise protect against intrusion. One thing
// you could do is have a very small ftp area, and only allow existing
// files to be appended (for example).
//
// Creating an applet with this program is like publishing your password
// to anyone who can access the applet class file.
//
// If you still want to proceed, it is at your own risk.
// **************************** Security Warning! ************************
// Instructions:
// 1. This file contains the applet I/O class Linlyn, and
// a sample applet, t, that uses it.
//
// 2. modify the literal strings in t.java
// to use your server, username, passwd etc.
//
// 3. compile by typing
// javac t.java
//
// 4. try running by:
// appletviewer t.java
// it will upload and retrieve a file for an applet
// (The html to run it is in this file, so t.java not t.html is OK).
//
// 5. modify t.java to be your own applet
//
// While getting started, you might want to uncomment the
// "debug" lines near the head of Linlyn.java; this will
// produce output to help in your initial configuration.
//
// if this works for you, send a note to pvdl@best.com, May 1998.
/*
This runs the Linlyn applet
*/
// a test applet to show the use of the Linlyn class
// you don't have to embed the passwd in the code - you could
// prompt for it.
//
import java.awt.*; // needed by the applet
import java.applet.*;
import java.io.*; // needed by Linlyn
import java.net.*;
import java.util.*;
public class t extends Applet {
public void init() {
try {
// upload to file
// You must replace the strings with actual values to use.
// e.g. Linlyn("microsoft.com","billg", "allmy$$$");
Linlyn u = new Linlyn("YOUR_SERVER", "USERNAME", "PASSWD");
u.upload("pub", "score.txt",
"'Just Java 1.1' is a great Java book! \n" +
"available quick and cheap from \n" +
" http://www.amazon.com/exec/obidos/ISBN%3D0137841744 " );
// download from file
// You must replace the strings with actual values to use.
Linlyn d = new Linlyn("YOUR_SERVER", "USERNAME", "PASSWD");
String s = d.download("pub", "score.txt");
// display file contents
TextArea ta = new TextArea( s, 3, 40);
add(ta);
} catch(java.io.IOException ioe) {ioe.printStackTrace();}
}
}
//////////////////////////////////////////
/// split here for Linlyn.java //
// At last! Java code to read/write files on the server from an applet!
// This is the famous Linlyn code.
//
// Use:
// compile this file, and have your applet call it as below.
//
// to upload a file:
// Linlyn ftp = new Linlyn( , , );
// ftp.upload( , , );
//
// to download a file:
// Linlyn ftp = new Linlyn( , , );
// String contents = ftp.download( , );
//
// the default is ASCII transfer, an overloaded method does bin.
//
// All parameters and return values are Strings. E.g.
// Linlyn ftp = new Linlyn( "rtfm.mit.edu", "anonymous", "linden@" );
// String contents = ftp.download(
// "/pub/usenet-by-group/comp.lang.java.programmer"
// "Java_Programmers_FAQ" );
//
// [the actual values above are not generally valid, substitute
// your own server for your first attempt, see note 1.]
//
// Notes:
// 1. Usual applet security rules apply: you can only get a file
// from the server that served the applet.
// 2. The applet server must also be an FTP server. This is NOT true
// for some ISPs, such as best.com. They have separate FTP and
// http machines. This code may work on such a setup if you put
// the classfiles into the ftp area, and in the HTML file say:
//