Telnet client help

hi
i wanna build a telnet client , that simply connects to a telnet server and exceute a program ...
What should i do for getting started ???
Regards,
Asad

I recall that the O'Reilly book Java Examples in a Nutshell had a telnet client as one of the examples. If they make their example source code available at oreilly.com that would be a good place to check.

Similar Messages

  • Telnet Client fails to detect Telnet Server reboot

    Hello All,
    I have written a telnet client that establishes a telnet session with the help of org.apache.commons.net.telnet.TelnetClient to the server and it monitors a particular file. It reads the latest contents written to that file using the tail -F command . The problem I am facing is that the blocking call inputStream.read(int) does not throw an exception even when the telnet server machine reboots, but When network cable is unplugged we are getting an IOException. Due to this behavior my program fails to receive the updates from the file after a machine reboot. Even the telnetClientObject.isConnected() returns true while the machine is rebooting.
    Can you please suggest ways to rectify this issue?
    Thanks,
    Naveen

    Set a socket read timeout.

  • Telnet Client?

    Hey, brand new Mac user here, and pretty much a novice in all things computer related. I'm enrolled in a web publishing class through my university and I'm trying to get away with using iweb, however I'm not entirely sure how to publish to the universities browser. I've got one guy telling me what I need is a "telnet client" again, novice, not a clue what that means or where to locate that. Any help would be greatly appreciated.

    I'm
    not entirely sure how to publish to the universities
    browser.
    Instead of "browser" you mean "server."
    I've got one guy telling me what I need is a
    "telnet client" again
    You need an ftp client.
    Here are some tips for using iWeb with other servers:
    http://homepage.mac.com/thgewecke/iwebserver.html

  • Telnet client in Windows

    To communicate with a telnet service using java client application, sockets are used. When I type "telnet" in DOS prompt I see something like this on the console:
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    Welcome to Microsoft Telnet Client
    Telnet Client Build 5.00.99201.1
    Escape Character is 'CTRL+]'Why is it that when I run my code, the inputstream does not contain the above lines?
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            PrintWriter out = null;
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                out = new PrintWriter(socketClient.getOutputStream());
                in = socketClient.getInputStream();
                System.out.println(">>> connected!!!");
            } catch (UnknownHostException e) {
                System.err.println("Don't know about host: localhost.");
                System.exit(1);
            } catch (IOException e) {
                System.err.println("Couldn't get I/O for the connection to: localhost.");
                System.exit(1);
            try{
              out.println("telnet");
              out.println("help");
              out.flush();
              char c;
              while ( (c=(char)in.read()) > -1) {
                  System.out.println("Reply: " + c);
              out.close();
              in.close();
              socketClient.close();
            }catch(Exception e){
              e.printStackTrace();
            }When I compile and run the code... the following is produced:
    connected!!!Have I missed something?

    noah.w:
    I tried Your code, and it's worked but doesn't support my needs completely. I wrote my version of it, but it doesn't do what I want to. Could You tell me please where's my fault? Here is my code:
    import java.net.*;
    import java.io.*;
    public class kontaktor {
         private StringBuffer beolvasott_sor = new StringBuffer();
         private Socket sock = null;
         private PrintStream os = null;
         private InputStream is = null;
         public static void main(String argv[]) {
              if (argv.length != 3) {
                   System.out.println("Usage: java kontaktor IP port message");
                   System.exit(0);
              } else {
                   kontaktor kon = new kontaktor();
                   System.out.println(kon.send_msg(argv[0], Integer.parseInt(argv[1]), argv[2]));
         public kontaktor() {
         public String send_msg (String ipcim, int port, String msg) {
              try {
                   boolean szolgalatban = true;
                   sock = new Socket(ipcim, port);
                   os = new PrintStream(sock.getOutputStream(), true);
              } catch (Exception e) {
                   System.out.println("InitializeException "+e+"\n"+e.getMessage());
              try {
                   os.print(msg);
                   os.print("\r\n");
                   os.flush();
              } catch (Exception e) {
                   System.out.println("SendMsgException "+e+"\n"+e.getMessage());
              try {
                   is = sock.getInputStream();
    //               String line;
                   int i;
                   int m = 0;
                   while(m < is.available()) {
                        i = is.read();
                        if (i == 255)                {
                             int i1 = is.read();
                             int i2 = is.read();
                             tel_net(i1,i2);
                        }     else     {
                             beolvasott_sor.append((char)i);
    //                         os.flush();
                        m++;
    //               beolvasott_sor = kis.readLine();
              } catch (Exception e) {
                   System.out.println("GetAnswerException "+e+"\n"+e.getMessage());
              try {
                   os.close();
                   is.close();
                   sock.close();
              } catch (Exception e) {
                   System.out.println("CloseAllException "+e+"\n"+e.getMessage());
              return beolvasott_sor.toString().trim();
         private void tel_net(int i1, int i2){
              int i = i1;
              if (i == 253)     {
                   i = i2;
                   if (i == 1) wont(i);
                   else if (i == 24) wont(i);
                   else if (i == 31) wont(i);
                   else if (i == 35) wont(i);
                   else if (i == 36) wont(i);
                   else if (i == 39) wont(i);
         private void wont(int i) {
              try      {
                   os.write(255);
                   os.write(252);
                   os.write(i);
              }     catch (Exception e)     {
                   System.out.println(e);
    }

  • Request: Sendmail and telnet client

    Really would like sendmail as we use it at work. I am playing with exim now but 1 mta is enough to get lost in.
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    Lifted from yolinux.com:
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       HELP                      - List the SMTP commands that are supported. (Included FYI and not part of a typical dialog)
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       RCPT TO: recipient-email-address
       DATA                      - End of DATA section is punctuated with a single dot on it's own line.
       Subject: E-mail-Subject
       Text of e-mail goes here
       .                         - The single dot
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  • Having problems with a Java Telnet Client

    I'm trying to write a Telnet Client(for a mud). I've searched the forum but can't seem to find the answer to my problem. The mud sends the ANSI color codes, is there anyway to get java to interpret this, or will I have to make a parser and do all the work by hand?

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    2. All Commands start with the Interpret As Command (IAC) character, decimal 255 or hexidecimal ff.
    3. IAC DO/DONT/WILL/WONT Negotiations for a Telnet Option occurs before IAC SB/SE Subnegotiations. DON'T/WON'T is the default Telnet Network Virtual Terminal (NVT) setting for all options.
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    254 == DON'T, as is "I DON'T support xyz...."
    253 == DO, as in "I DO support xyz..."
    252 == WON'T, as in "You WON'T support abc..."
    251 == WILL, as in "You WILL support abc..."
    250 == SuBnegotiations Start (SB)
    240 == Subnegotiations End (SE)
    The above has 2 commands:
    - 255, 253, 3 == IAC DO Suppress Go Ahead
    - 255, 253, 24 == IAC DO Terminal Type
    Appropriate Responses could be:
    - 255, 251, 3, 255, 251, 24, etc....
    OR
    - 255, 252, 3, 255,252, 24, etc...
    OR
    - 255, 251, 3, 255, 252, 24, etc...
    OR
    - 255,252, 3, 255, 251,24, etc...
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  • Invoke 64 bit Telnet client via 32 bit JRE

    Hi,
    How do i invoke 64 bit Telnet client of a Win 7 OS via 32 bit JRE.
    String command = "cmd /c start cmd.exe /K \"telnet <ip-address>\"";
    Runtime.getRuntime().exec(command);
    It works fine as expected if i use 64 bit JRE.
    It throws "telnet' is not recognized as an internal or external command, operable program or batch file." while i execute via 32 bit JRE.
    but my requirement is tightly coupled with 32 bit JRE.
    is there anyway to overcome this issue?
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    Expecting your responses.
    Thanks
    Vetri

    found the solution by someway.:)
    Copy the "telnet.exe" file from C:\Windows\System32 folder to C:\Windows\SysWOW64
    Post this operation, telnet prompt got opened while it executed via 32 bit JRE even though telnet client is specific to operation system. i.e 64 bit.
    String command = "cmd /c start cmd.exe /K \"telnet <ip-address> \"";
    Runtime.getRuntime().exec(command);
    Ref : http://en.wikipedia.org/wiki/WoW64

  • Need a Telnet Client Implementation in Java

    Hi,
    I am looking for a Telnet Client Class in Java.
    Any pointers on this is appreciated.
    regards,
    jitu

    How to:
    http://forum.java.sun.com/thread.jsp?forum=31&thread=58110
    + http://www.mud.de/se/jta/ to download
    http://forum.java.sun.com/thread.jsp?forum=31&thread=177316
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    http://forum.java.sun.com/thread.jsp?forum=31&thread=179353
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  • Telnet client for Palm VIIx that uses IR port

    Hi folks
    I know the IRda port on my Windows XP-equipped IBM ThinkPad can support TCP/IP connections via PPP (I've gotten those up and running before between two laptops, even if the connection died seconds later for unknown reasons).
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  • Telnet client - multiple servers

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    National Instruments

  • Telnet Client Application using J2ME

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  • Java telnet client on windows 2000 Telnet Service

    Hi All,
    I am trying to find a java based telnet client which can connect to Windows2000 telnet Service. All the telnet client which I found are throwing somekind of TimedOutException. This is happening despite the telnet server up and running(I am able to connect it through the windows telnet client).
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  • Need Simple telnet client for N8

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    I've already tried putty (its SSH only ..sad)
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    I am using Telmu SSH/Telnet client in my n95. It is available for s60 2nd edition as well as 3rd. It is not free though, full version costs 15 EUR.
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    Does anyone know any decent telnet clients?
    latest putty 089 s^3 doesnt support telnet, any experience with older versions?
    midpSSH difficult to use with those big cursor buttons
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  • How do I connect multiple telnet clients to a telnet server in LabVIEW?

    Good afternoon,
    I'm writing a telnet server in LabView 6.1 that needs to handle multiple clients. To do this, I modified the "viserver\runvi.llb" example to use the telnet VI's from the Internet Toolkit instead of the TCP VI's. Then I changed the Open VI Reference to point to my telnet handler. Right now my handler just echoes the characters received from the client.
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    e gotten the telnet VI's to run in parallel? Not sure if they are thread-safe or not. If you have some experience with this, I have attached my llb if you think you can help.
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    Chris Norris
    Carrier Access Corp.
    [email protected]
    (303) 218-5826
    Attachments:
    CAC_Telnet_Server.llb ‏92 KB

    I don't think there's a problem with the TCP/connection portion of things. My feeling is that the problem is lurking somewhere in the timing of the application, or in the way LabVIEW task scheduling/multitasking is working compared to the way you expect it to work.
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