Scripting communications with telnet servers using Java

Overview 

        This article will demonstrate how to script communications with telnet servers in Java using Secure iNet Factory.

Code Example

      Download TelnetScriptEx.java

               

01 import com.jscape.inet.telnet.*; 02 03 public class TelnetScriptEx 04 { 05  public static void main(String[] args) 06  { 07  try 08  { 09  String loginPrompt = "login:"; 10  String passwordPrompt = "Password:"; 11  String shellPrompt = "#"; 12  String username = "jsmith"; 13  String password = "secret"; 14  String command = "ls –al"; 15   16  // create new Telnet instance 17  Telnet telnet = new Telnet("10.0.0.1"); 18  // create new TelnetScript instance and bind to Telnet instance 19  TelnetScript script = new TelnetScript(telnet); 20  // build task to submit username using regular expressions    21  TelnetTask loginTask = new TelnetTask("[Ll]ogin:","jsmith","[Pp]assword:");    22  loginTask.setStartPromptRegex(true); 23  loginTask.setEndPromptRegex(true);  24  // build task to submit password 25  TelnetTask passwordTask = new TelnetTask(passwordPrompt,password,shellPrompt); 26  // build task to execute command 27  TelnetTask commandTask = new TelnetTask(shellPrompt,command,shellPrompt); 28  // add all tasks to script 29  script.addTask(loginTask); 30  script.addTask(passwordTask); 31  script.addTask(commandTask); 32   33  // connect to telnet server … script is executed automatically 34  telnet.connect();  35  // wait until last task is complete 36  while(!commandTask.isComplete()) 37  { 38  Thread.sleep(500); 39  } 40  // get response of completed task 41  String response = commandTask.getResponse(); 42  // last task completed … disconnect from server 43  telnet.disconnect(); 44  } 45  catch (Exception e) 46  { 47  e.printStackTrace(); 48  } 49  } 50 } Line 1  : Necessary import statement. Line 17 : Create Telnet instance. Lines 19-27 : Create TelnetTask instances. Lines 29-31 : Add TelnetTask instances to TelnetScript instance. Line 34     : Open connection to the server. Lines 36-39 : Wait for TelnetTask instance to complete. Line 41     : Read response.