Sockets -- EchoSockets

Author: begandroide

README.md

@@ -0,0 +1,42 @@
+
+import java.io.*;
+import java.net.*;
+
+public class EchoClient {
+    public static void main(String[] args) throws IOException {
+        
+        if (args.length != 2) {
+            System.err.println(
+                "Usage: java EchoClient <host_name> <port_number>");
+            System.exit(1);
+        }
+
+        String hostName = args[0];
+        int portNumber = Integer.parseInt(args[1]);
+
+        try (
+            Socket echoSocket = new Socket(hostName, portNumber);
+            PrintWriter out =
+                new PrintWriter(echoSocket.getOutputStream(), true);
+            BufferedReader in =
+                new BufferedReader(
+                    new InputStreamReader(echoSocket.getInputStream()));
+            BufferedReader stdIn =
+                new BufferedReader(
+                    new InputStreamReader(System.in))
+        ) {
+            String userInput;
+            while ((userInput = stdIn.readLine()) != null) {
+                out.println(userInput);
+                System.out.println("echo: " + in.readLine());
+            }
+        } catch (UnknownHostException e) {
+            System.err.println("Don't know about host " + hostName);
+            System.exit(1);
+        } catch (IOException e) {
+            System.err.println("Couldn't get I/O for the connection to " +
+                hostName);
+            System.exit(1);
+        } 
+    }
+}

Sockets/EchoClient.class

@@ -0,0 +1,39 @@
+
+import java.net.*;
+import java.io.*;
+
+public class EchoServer {
+    public static void main(String[] args) throws IOException {
+        
+        if (args.length != 1) {
+            System.err.println("Usage: java EchoServer <port_number>");
+            System.exit(1);
+        }
+        
+        int portNumber = Integer.parseInt(args[0]);
+        
+        try (
+            ServerSocket serverSocket =
+                new ServerSocket(Integer.parseInt(args[0]));
+            Socket clientSocket = serverSocket.accept();     
+            PrintWriter out =
+                new PrintWriter(clientSocket.getOutputStream(), true);                   
+            BufferedReader in = new BufferedReader(
+                new InputStreamReader(clientSocket.getInputStream()));
+        ) {
+            String inputLine;
+            while ((inputLine = in.readLine()) != null) {
+                System.out.println(inputLine);
+                if(inputLine == "Hola"){
+                    
+                    inputLine.replace('o', 'a');
+                }
+                out.println(inputLine);
+            }
+        } catch (IOException e) {
+            System.out.println("Exception caught when trying to listen on port "
+                + portNumber + " or listening for a connection");
+            System.out.println(e.getMessage());
+        }
+    }
+}