praktikum3

client/src/main/java/org/example/demo/praktikum3/ChatWindow.java

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+package org.example.demo.praktikum3;
+
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+
+public class ChatWindow extends JFrame {
+    private JTextArea textArea;
+    private MessageReceiver receiver;
+
+    private JPanel inputPanel;
+    private JTextField messageInput;
+    private JButton messageSubmit;
+    private MessageSender sender;
+
+    public ChatWindow(MessageReceiver receiver, MessageSender sender) {
+        textArea = new JTextArea();
+        this.add(BorderLayout.NORTH, textArea);
+        receiver.setText(textArea);
+
+        inputPanel = new JPanel();
+        inputPanel.setLayout(new FlowLayout());
+        this.add(BorderLayout.SOUTH, inputPanel);
+
+        messageInput = new JTextField(20);
+        inputPanel.add(messageInput);
+
+        messageSubmit = new JButton("Submit");
+        messageSubmit.addActionListener(e -> {
+            sender.sendMessage(messageInput.getText());
+        });
+        inputPanel.add(messageSubmit);
+
+        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    }
+}

client/src/main/java/org/example/demo/praktikum3/Client.java

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+package org.example.demo.praktikum3;
+
+import java.util.Properties;
+import javax.naming.Context;
+import javax.naming.InitialContext;
+import javax.naming.NamingException;
+import jakarta.jms.ConnectionFactory;
+import jakarta.jms.Topic;
+
+public class Client {
+    private int id;
+
+    public Client(int id) {
+        this.id = id;
+
+        Properties props = new Properties();
+        props.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.wildfly.naming.client.WildFlyInitialContextFactory");
+        props.setProperty(Context.PROVIDER_URL, "http-remoting://127.0.0.1:8080");
+
+        try {
+            InitialContext context = new InitialContext(props);
+            ConnectionFactory cf = (ConnectionFactory) context.lookup("jms/RemoteConnectionFactory");
+            Topic topic = (Topic) context.lookup("jms/topic/Praktikum3Topic");
+
+            var sender = new MessageSender(topic, cf, "Sender " + this.id + ": ");
+            var receiver = new MessageReceiver(topic, cf, null);
+            var win = new ChatWindow(receiver, sender);
+
+            win.setVisible(true);
+            win.setTitle("Chat - Sender " + this.id);
+            receiver.start();
+        } catch (NamingException e) {
+            e.printStackTrace();
+        }
+    }
+}

client/src/main/java/org/example/demo/praktikum3/Client1.java

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+package org.example.demo.praktikum3;
+
+public class Client1 {
+    public static void main(String[] args) {
+        new Client(1);
+    }
+}

client/src/main/java/org/example/demo/praktikum3/Client2.java

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+package org.example.demo.praktikum3;
+
+public class Client2 {
+    public static void main(String[] args) {
+        new Client(2);
+    }
+}

client/src/main/java/org/example/demo/praktikum3/MessageReceiver.java

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+package org.example.demo.praktikum3;
+
+import javax.swing.JTextArea;
+import javax.swing.SwingUtilities;
+import jakarta.jms.ConnectionFactory;
+import jakarta.jms.JMSConsumer;
+import jakarta.jms.JMSContext;
+import jakarta.jms.Topic;
+
+public class MessageReceiver extends Thread {
+    private JTextArea text;
+    private Topic topic;
+    private ConnectionFactory cf;
+
+    public MessageReceiver(Topic topic, ConnectionFactory cf, JTextArea text) {
+        this.text = text;
+        this.topic = topic;
+        this.cf = cf;
+    }
+
+    public JTextArea getText() {
+        return text;
+    }
+
+    public void setText(JTextArea text) {
+        this.text = text;
+    }
+
+    public void run() {
+        try (JMSContext context = cf.createContext("guest", "guest")) {
+            JMSConsumer consumer = context.createConsumer(topic);
+            while (true) {
+                String message = consumer.receiveBody(String.class);
+                if (message != null) {
+                    SwingUtilities.invokeLater(() -> text.append(message + "\n"));
+                }
+            }
+        }
+    }
+}

client/src/main/java/org/example/demo/praktikum3/MessageSender.java

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+package org.example.demo.praktikum3;
+
+import jakarta.jms.ConnectionFactory;
+import jakarta.jms.JMSContext;
+import jakarta.jms.JMSProducer;
+import jakarta.jms.TextMessage;
+import jakarta.jms.Topic;
+
+public class MessageSender {
+    private String prefix;
+    private Topic topic;
+    private ConnectionFactory cf;
+
+    public MessageSender(Topic topic, ConnectionFactory cf, String prefix) {
+        this.topic = topic;
+        this.cf = cf;
+        this.prefix = prefix;
+    }
+
+    public void sendMessage(String msg) {
+        var text = prefix + msg;
+
+        try (JMSContext context = cf.createContext("guest", "guest")) {
+            JMSProducer producer = context.createProducer();
+            TextMessage message = context.createTextMessage(text);
+            producer.send(topic, message);
+            System.out.println("Message '"+text+"' sent successfully.");
+        }
+        catch (Exception e) {
+            System.out.println("Message '"+text+"' couldn't be sent: " + e);
+        }
+    }
+}