When network testing, it is useful to have a client program that connects to a TCP/IP server and gets an echo of a text string that you send to the server:
import java.net.*;import java.io.*;import java.util.*;class SocketEcho01{ public static void main(String[] args){ String server = "www.yourFavoriteServer.com"; int port = 7; try{ Socket socket = new Socket(server,port);//Get socket //Get input and output streams from socket. BufferedReader inputStream = new BufferedReader(new InputStreamReader( socket.getInputStream())); PrintWriter outputStream = new PrintWriter(new OutputStreamWriter( socket.getOutputStream()),true); outputStream.println("This is an echo test");//send System.out.println(inputStream.readLine());//receive socket.close(); }//end try catch(UnknownHostException e){ System.out.println(e); System.out.println( "Connection Failure. Are you online?"); }//end catch UnknownHostException catch(IOException e){System.out.println(e);} }//end main}//end class SocketEcho01Edit your favorite Web server name into the String named server, and the program should display:
This is an echo test. If you receive another message, you should try another server.
