How to run Client socket?

[Anonymous]

HI, all
the following code has no problem in complilation,But when I try to run it, It gives me the error even if I change host 127.0.0.1
I guese there is some port problmes?
thanks in advance
import java.io.*;
import java.net.*;
public class EchoClient {
public static void main(String[] args) throws IOException {
Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try {
echoSocket = new Socket("127.0.0.1", 7000);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: taranis.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection to: taranis.");
System.exit(1);
}
BufferedReader stdIn = new BufferedReader(
new InputStreamReader(System.in));
String userInput;
while ((userInput = stdIn.readLine()) != null) {
out.println(userInput);
System.out.println("echo: " + in.readLine());
}
out.close();
in.close();
stdIn.close();
echoSocket.close();
}
}

C:\java\NETWORK>java EchoClient
Couldn't get I/O for the connection to: taranis.

[Anonymous]

HI, all
ignore the previous question ! I got it
Sorry I forget to run the serversock first
thanks