Network Programming, TCP/IP Echo Client

Network Programming, TCP/IP Echo Client

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*;import*;import java.util.*;class SocketEcho01{	public static void main(String[] args){		String server = "";		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 SocketEcho01

Edit 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.

See also  Essential Measures for Safeguarding Your Digital Data

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist