Apache Ant Telnet Task

Ant Telnet task is used to provide bidirectional text oriented communication facility. It is a network protocol. By default Apache Ant does not support it. So, we need to include a external JAR commons-net.jar file into classpath.

This task is mainly used to automate telnet session xml file.

The <telnet> element supports nested elements <read> and <write>to perform read/write operations respectively.

Apache Ant Telnet Task Attributes

Attribute	Values	Required
userid	A user id to login into server.	Yes
password	Password to login into server.	Yes
server	Server name/address.	Yes
port	the port number of the remote telnet server.	No
initialCR	send a cr after connecting.	No
timeout	set a default timeout to wait for a response.	No

Let's see some example to understand the telnet task.

Apache Ant Telnet Task Example

<project name="java-ant project" default="run">	
	<target name="run">
		<telnet userid="java" password="java123" server="localhost">
  			<read>/home/javatpoint</read>
    		<write>ls</write>
   			<read string="/home/javatpoint"/>
		</telnet>
	</target>
</project>

The above example is a simple telnet connection program which connect to localhost by mapping provided userid and password.

Time Out

<project name="java-ant project" default="run">	
	<target name="run">
		<telnet userid="java" password="******" server="localhost" timeout="20">
   			<read>/home/javatpoint</read>
   			<write echo="false">sleep 15</write>
   			<read timeout="10">/home/javatpoint</read>
		</telnet>
	</target>
</project>

During connection, we can also set connection timeout period.

Specify Port Number

<project name="java-ant project" default="run">	
	<target name="run">
		<telnet port="80" server="localhost" timeout="20">
   			<read/>
   			<write>GET / http/0.9</write>
  			<write/>
   			<read timeout="10"></HTML></read>
		</telnet>
	</target>
</project>

We can also specify port number to connect with the network running on different-different port numbers.

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