From 3e141a913a4805ff3b22403e644b2f1517e68c80 Mon Sep 17 00:00:00 2001
From: Tobias Jordine <jordine@hdm-stuttgart.de>
Date: Thu, 26 May 2022 17:18:00 +0200
Subject: [PATCH] added client server demo
---
src/main/java/EchoServer.java | 44 +++++++++++++++++++++++++++++++
src/main/java/GreetClient.java | 47 ++++++++++++++++++++++++++++++++++
2 files changed, 91 insertions(+)
create mode 100644 src/main/java/EchoServer.java
create mode 100644 src/main/java/GreetClient.java
diff --git a/src/main/java/EchoServer.java b/src/main/java/EchoServer.java
new file mode 100644
index 0000000..0cd7922
--- /dev/null
+++ b/src/main/java/EchoServer.java
@@ -0,0 +1,44 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+// Adapted from https://www.baeldung.com/a-guide-to-java-sockets
+public class EchoServer {
+
+ private ServerSocket serverSocket;
+ private Socket clientSocket;
+ private PrintWriter out;
+ private BufferedReader in;
+
+ public void start(int port) throws IOException {
+ serverSocket = new ServerSocket(port);
+ clientSocket = serverSocket.accept();
+ out = new PrintWriter(clientSocket.getOutputStream(), true);
+ in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+
+ String inputLine;
+ while ((inputLine = in.readLine()) != null) {
+ if (".".equals(inputLine)) {
+ out.println("good bye");
+ break;
+ }
+ out.println(inputLine.toUpperCase());
+ }
+ }
+
+ public void stop() throws IOException {
+ in.close();
+ out.close();
+ clientSocket.close();
+ serverSocket.close();
+ }
+
+ public static void main(String[] args) throws IOException {
+ EchoServer server=new EchoServer();
+ server.start(9191);
+ }
+
+}
diff --git a/src/main/java/GreetClient.java b/src/main/java/GreetClient.java
new file mode 100644
index 0000000..f3c76ce
--- /dev/null
+++ b/src/main/java/GreetClient.java
@@ -0,0 +1,47 @@
+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 GreetClient {
+ private Socket clientSocket;
+ private PrintWriter out;
+ private BufferedReader in;
+
+ public void startConnection(String ip, int port) throws IOException {
+ clientSocket = new Socket(ip, port);
+ out = new PrintWriter(clientSocket.getOutputStream(), true);
+ in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+ }
+
+ public String sendMessage(String msg) throws IOException {
+ out.println(msg);
+ String resp = in.readLine();
+ return resp;
+ }
+
+ public void stopConnection() throws IOException {
+ in.close();
+ out.close();
+ clientSocket.close();
+ }
+
+ public static void main(String[] args) throws IOException {
+ GreetClient client = new GreetClient();
+ Scanner in = new Scanner(System.in);
+ client.startConnection("127.0.0.1", 9191);
+ while (true){
+ String text = in.nextLine();
+ String response = client.sendMessage(text);
+ System.out.println("Server Response: " + response);
+
+ if (text.equals(".")){
+ break;
+ }
+ }
+
+ client.stopConnection();
+ }
+}
\ No newline at end of file
--
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