init

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_18" project-jdk-name="17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/sockets-java.iml" filepath="$PROJECT_DIR$/.idea/sockets-java.iml" />
+    </modules>
+  </component>
+</project>

.idea/sockets-java.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

client/Client.java

@@ -0,0 +1,15 @@
+public class Client {
+  public static void main(String[]args){
+    System.out.println("hello from Client");
+    ClientObject client = new ClientObject();
+    client.startConnection("localhost", 10069);
+    String answer = client.sendMessage("Hallo from the other side!");
+
+    System.out.println("-----------------------------------");
+    System.out.printf("\t%s\t", answer);
+    System.out.println("-----------------------------------");
+
+    client.stopConnection();
+  }
+  
+}

client/ClientObject.java

@@ -0,0 +1,42 @@
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.Socket;
+
+public class ClientObject{
+    private Socket clientSocket;
+    private PrintWriter out;
+    private BufferedReader in;
+
+    public void startConnection(String ip, int port) {
+        try{
+            clientSocket = new Socket(ip, port);
+            out = new PrintWriter(clientSocket.getOutputStream(), true);
+            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+        }catch(Exception e){
+            System.out.println("Error starting client connection");
+            System.out.println(e);
+        }
+    }
+
+    public String sendMessage(String msg) {
+        out.println(msg);
+        String resp = "";
+        try{
+           resp = in.readLine();
+        }catch(Exception e){
+            System.out.println("Error reading message");
+        }
+        return resp;
+    }
+
+    public void stopConnection() {
+        try{
+            in.close();
+            out.close();
+            clientSocket.close();
+        }catch(Exception e){
+            System.out.println("Error closing connection");
+        }
+    }
+}

server/Server.java

@@ -0,0 +1,13 @@
+package server;
+
+public class Server {
+
+    public static void main(String[] args) {
+        System.out.println("Hello from Server");
+    
+    
+        Service s = new Service();
+        s.start(10069);
+
+    }
+}

server/Service.java

@@ -0,0 +1,48 @@
+package server;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class Service {
+
+
+    private ServerSocket serverSocket;
+    private Socket clientSocket;
+    private PrintWriter out;
+    private BufferedReader in;
+
+    public void start(int port) {
+        try{
+            serverSocket = new ServerSocket(port);
+        clientSocket = serverSocket.accept();
+        out = new PrintWriter(clientSocket.getOutputStream(), true);
+        in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+        String greeting = in.readLine();
+            if ("Hallo from the other side!".equals(greeting)) {
+                out.println("hello client");
+            }
+            else {
+                out.println("unrecognised greeting");
+            }
+        }catch(Exception e){
+            System.out.println("Error starting");
+            System.out.println(e);
+        }
+    }
+
+    public void stop() {
+        try{
+            in.close();
+            out.close();
+            clientSocket.close();
+            serverSocket.close();
+        }catch(Exception e){
+            System.out.println("Error stopping");
+            System.out.println(e);
+        }
+    }
+    
+}