Network Programming with Java Sockets

19-NetworkProgramming/Echo-TCP/Client.java

@@ -0,0 +1,31 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.util.Scanner;
+
+public class Client {
+    public static void main(String[] args) {
+        try(Socket socket = new Socket("localhost",5000)){
+            BufferedReader iStream = new BufferedReader(new InputStreamReader(socket.getInputStream()));
+            PrintWriter oStream = new PrintWriter(socket.getOutputStream(),true);
+            Scanner scanner = new Scanner(System.in);
+
+            while(true){
+                System.out.print("input> ");
+                String message = scanner.nextLine();
+
+                oStream.println(message);
+                if(message.equalsIgnoreCase("exit")){
+                    String response = iStream.readLine();
+                    System.out.println(response);
+                    break;
+                }
+            }
+
+        }catch (Exception e){
+            System.out.println("error: "+e.getMessage());
+        }
+    }
+}

19-NetworkProgramming/Echo-TCP/Server.java

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+import java.io.*;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class Server {
+    public static void main(String[] args) {
+        try(ServerSocket serverSocket = new ServerSocket(5000)){
+            System.out.println("listening to port:5000");
+            Socket clientSocket = serverSocket.accept();
+            System.out.println(clientSocket+" connected.");
+            BufferedReader iStream = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+            PrintWriter oStream = new PrintWriter(clientSocket.getOutputStream(),true);
+
+            while (true){
+                String message = iStream.readLine();
+                System.out.println("client: "+message);
+                if(message.equalsIgnoreCase("exit")){
+                    oStream.println("connection closed.");
+                    System.out.println("connection closed.");
+                    break;
+                }
+            }
+
+        } catch (Exception e){
+            System.out.println("error: "+e.getMessage());
+        }
+    }
+}