Connecting to a router

Hi
I want to make a program to connect to a router using Http protocol or Telnet protocol.
I tried running a command prompt on my PC and connecting to the router using telnet commands i used the Process class but i failed

Thank you in advance

Welcome to the Ranch!

java telnet leads to several Telnet libraries. Surprisingly, Apache Commons Net isn't found on the first two pages, so I thought I'd mention it explicitly.

HTTP is probably going to be more difficult as it will certainly involve a bit more complex requests. HttpClient can be a great help.

thank you Rob Spoor

how can i send multiple commands to command prompt?

I tried this code. what the error here?

this program didn't have syntax errors.

package test10;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) {
        try
        {
        String [] cmd=new String[3];
        cmd[0]="cmd";
        cmd[1]="/c";
        cmd[2]="telent 192.168.1.1 && 123 && en && 123 && config t && banner motd #hello# && exit && sh run";
        
         Process p=Runtime.getRuntime().exec(cmd);
        BufferedReader line=new BufferedReader(new InputStreamReader(p.getInputStream()));
        String st=line.readLine();
        while(st !=null)
        {
            System.out.println(st);
            st=line.readLine();
        }
        BufferedReader stdInput=new BufferedReader(new InputStreamReader(p.getInputStream()));
        BufferedReader stdError=new BufferedReader(new InputStreamReader(p.getErrorStream()));
        String error;
        while((error=stdInput.readLine()) != null)
        {
            System.out.println(error);
        }
        while((error=stdError.readLine()) != null)
        {
            System.out.println(error);
        }

}
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

}

Please don't use such a large font. I've had to remove the formatting on both of your posts already. Also, UseCodeTags from now on. See how much easier your code is to read.

Why didn't you use a Telnet library like I suggested?

Is the command-line Telnet client on your system really called "telent"?

The Windows telnet client is a GUI client that doesn't take commands on the command line; something tells me he's just using that stock client, anyway.

Does the router really accept Telnet requests?

One issue to be aware of is Don't println to a Socket, which the code is doing by using readLine.

There's a slight difference. readLine is able to handle \r, \n and \r\n as line breaks. It did (does?) have a bug that if the stream ends with a \r without a \n after it, readLine would block.

Thank you for helping me

I think i found the solution to my problem here

but i don't know how can i press the carriage return?

A carriage return is just the character '\r'. You can include that in Strings as you would any other character.