Class telnet

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--java.applet.Applet
                          |
                          +--telnet

public class telnet

extends java.applet.Applet

implements java.lang.Runnable, TerminalHost, StatusPeer

A telnet implementation that supports different terminal emulations.

Version:

$Id: telnet.java,v 1.21 1999/03/04 07:45:50 leo Exp $

Author:

Matthias L. Jugel, Marcus Meißner

See Also:

Serialized Form

Field Summary

protected java.lang.String	address The host address to connect to.
protected java.lang.String	emulation Emulation type (default is vt320).
protected java.util.Vector	modules Dynamically loaded modules are stored here.
java.util.Hashtable	params This Hashtable contains information retrievable by getParameter() in case the program is run as an application and the AppletStub is missing.
protected int	port The port number (default ist 23).
protected java.lang.String	proxy The proxy ip address.
protected int	proxyport The proxy port number.
protected Terminal	term The terminal emulation (dynamically loaded).
protected TelnetIO	tio The telnet io methods.

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

telnet()

Method Summary

boolean	connect() Connect to the specified host and port but don't break existing connections.
boolean	connect(java.lang.String host) Connect to the specified host and port but don't break existing connections.
boolean	connect(java.lang.String host, int prt) Connect to the specified host and port but don't break existing connections.
boolean	disconnect() Disconnect from the remote host.
java.lang.String	getAppletInfo() Retrieve the current version of the applet.
java.lang.String	getParameter(java.lang.String name) We override the Applet method getParameter() to be able to handle parameters even as application.
java.lang.String[][]	getParameterInfo() Retrieve parameter tag information.
void	init() Initialize applet.
static void	main(java.lang.String[] args) The main function is called on startup of the application.
java.lang.Object	notifyStatus(java.util.Vector status) This method is called when telnet needs to be notified of status changes.
void	run() Try to read data from the sockets and put it on the terminal.
boolean	send(java.lang.String str) Send a String to the remote host.
void	start() Upon start of the applet try to create a new connection.
void	stop() Disconnect when the applet is stopped.
boolean	writeToSocket(java.lang.String str) Send a String to the remote Host.
void	writeToUser(java.lang.String str) Send a String to the users terminal

Methods inherited from class java.applet.Applet

destroy, getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setFont, setLayout, update, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

tio

protected TelnetIO tio

The telnet io methods.

See Also:

TelnetIO

term

protected Terminal term

The terminal emulation (dynamically loaded).

See Also:

emulation, Terminal, TerminalHost

address

protected java.lang.String address

The host address to connect to. This is retrieved from the PARAM tag "address".

port

protected int port

The port number (default ist 23). This can be specified as the PARAM tag "port".

proxy

protected java.lang.String proxy

The proxy ip address. If this variable is set telnet will try to connect to this address and then send a string to tell the relay where the target host is.

See Also:

address

proxyport

protected int proxyport

The proxy port number. This is the port where the relay is expected to listen for incoming connections.

See Also:

proxy, port

emulation

protected java.lang.String emulation

Emulation type (default is vt320). This can be specified as the PARAM tag "emulation".

See Also:

term, Terminal, TerminalHost

modules

protected java.util.Vector modules

Dynamically loaded modules are stored here.

params

public java.util.Hashtable params

This Hashtable contains information retrievable by getParameter() in case the program is run as an application and the AppletStub is missing.

Constructor Detail

telnet

public telnet()

Method Detail

getAppletInfo

public java.lang.String getAppletInfo()

Retrieve the current version of the applet.

Returns:

String a string with the version information.

Overrides:

getAppletInfo in class java.applet.Applet

getParameterInfo

public java.lang.String[][] getParameterInfo()

Retrieve parameter tag information. This includes the tag information from terminal and loaded modules.

Returns:

String an array of array of string with tag information

Overrides:

getParameterInfo in class java.applet.Applet

See Also:

Applet.getParameterInfo()

getParameter

public java.lang.String getParameter(java.lang.String name)

We override the Applet method getParameter() to be able to handle parameters even as application.

Parameters:

name - The name of the queried parameter.

Returns:

the value of the parameter

Overrides:

getParameter in class java.applet.Applet

See Also:

Applet.getParameter(java.lang.String)

main

public static void main(java.lang.String[] args)

The main function is called on startup of the application.

init

public void init()

Initialize applet. This method reads the PARAM tags "address", "port" and "emulation". The emulation class is loaded dynamically. It also loads modules given as parameter "module#".

Overrides:

init in class java.applet.Applet

start

public void start()

Upon start of the applet try to create a new connection.

Overrides:

start in class java.applet.Applet

stop

public final void stop()

Disconnect when the applet is stopped.

Overrides:

stop in class java.applet.Applet

run

public void run()

Try to read data from the sockets and put it on the terminal. This is done until the thread dies or an error occurs.

Specified by:

run in interface java.lang.Runnable

connect

public boolean connect()

Connect to the specified host and port but don't break existing connections. Connects to the host and port specified in the tags.

Returns:

false if connection was unsuccessful

connect

public boolean connect(java.lang.String host)

Connect to the specified host and port but don't break existing connections. Uses the port specified in the tags or 23.

Parameters:

host - destination host address

connect

public boolean connect(java.lang.String host,
                       int prt)

Connect to the specified host and port but don't break existing connections.

Parameters:

host - destination host address

prt - destination hosts port

disconnect

public boolean disconnect()

Disconnect from the remote host.

Returns:

false if there was a problem disconnecting.

send

public boolean send(java.lang.String str)

Send a String to the remote host. Implements display.TerminalHost

Specified by:

send in interface TerminalHost

Parameters:

s - String to be sent

Returns:

true if we are connected

See Also:

TerminalHost

writeToSocket

public boolean writeToSocket(java.lang.String str)

Send a String to the remote Host.

Parameters:

str - String to be sent

Returns:

true if we are connected

See Also:

BSXModule

writeToUser

public void writeToUser(java.lang.String str)

Send a String to the users terminal

Parameters:

str - String to be displayed

Returns:

void

See Also:

BSXModule

notifyStatus

public java.lang.Object notifyStatus(java.util.Vector status)

This method is called when telnet needs to be notified of status changes.

Specified by:

notifyStatus in interface StatusPeer

Parameters:

status - Vector of status information.

Returns:

an object of the information requested.

See Also:

StatusPeer