Runtime.getRuntime.exec（）

Question

I am trying to run this command-

Runtime.getRuntime().exec("telnet " + serverIP);

and nothing happens. I am not able to figure out why!

Answer 1

a) Avoid telnet, if possible, because it is so unsecure!

b) You have to pass a program name, which is "telnet", not "telnet ", and add parameters in an array "telnet", "IP", ... .

c) You have to use the whole path to telnet, because Java doesn't evaluate the PATH.

Here is a more complete overview of pitfalls with Runtime.getRuntime ().exec

Answer 2

In addition to "user unknown"s answer:

Telnet is not shiped with Windows Vista and Windows Se7en . You'll have to install it manually.

Also, since telnet communicates over TCP, you should use Sockets to do so in your program.