Merge branch 'main' of https://gitlab.cs.hs-fulda.de/fdai7332/java-chat

src/main/java/ChatClient.java

@@ -2,24 +2,26 @@ import javax.swing.*;
 import java.awt.*;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
-import java.io.IOException;
+import java.io.*;
 import java.net.Socket;
 
 public class ChatClient extends JFrame implements KeyListener {
     private String address;
-    private int port;
+    private String connectionFailedMessage;
     private Socket connectionToServer;
+    private BufferedReader fromServerReader;
+    private PrintWriter toServerWriter;
 
     // GUI
     private JTextArea outputTextArea;
     private JTextField inputTextField;
+    private JScrollPane outputScrollPane;
 
-    public ChatClient(int port) {
+    public ChatClient() {
         super("Chat");
-        this.port = port;
         address = JOptionPane.showInputDialog("bitte IP-Adresse");
-        
-        if (address != null) {
+        if (null != address) {
+            connectionFailedMessage = "Verbindung zum Server " + (address.isEmpty() ? "" : ("\"" + address + "\"")) + " fehlgeschlagen.";
             receiveMessages();
         }
     }
@@ -29,23 +31,56 @@ public class ChatClient extends JFrame implements KeyListener {
         outputTextArea.setEditable(false);
         outputTextArea.setBorder(BorderFactory.createTitledBorder("Chat"));
 
+        outputScrollPane = new JScrollPane(outputTextArea);
+
         inputTextField = new JTextField();
         inputTextField.setBorder(BorderFactory.createTitledBorder("Nachricht eingeben"));
         inputTextField.addKeyListener(this);
 
-        add(outputTextArea, BorderLayout.CENTER);
+        add(outputScrollPane, BorderLayout.CENTER);
         add(inputTextField, BorderLayout.SOUTH);
 
         setVisible(true);
-        setSize(800, 600);
+        setSize(Constants.WINDOW_WIDTH, Constants.WINDOW_HEIGHT);
         setDefaultCloseOperation(EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
     }
     private void receiveMessages() {
         try {
-            connectionToServer = new Socket(address, port);
+            connectionToServer = new Socket(address, Constants.PORT);
+            fromServerReader   = new BufferedReader(new InputStreamReader(connectionToServer.getInputStream()));
+            toServerWriter     = new PrintWriter(new OutputStreamWriter(connectionToServer.getOutputStream()));
+
             initGui();
-        } catch (Exception e) {
-            JOptionPane.showMessageDialog(null, "Verbindung zum Server \"" + address + "\" fehlgeschlagen.");
+
+            while (true) {
+                String message = fromServerReader.readLine();
+                outputTextArea.append(message + "\n");
+                outputScrollPane.getVerticalScrollBar().setValue(outputScrollPane.getVerticalScrollBar().getMaximum());
+            }
+        } catch (IOException e) {
+            JOptionPane.showMessageDialog(null, connectionFailedMessage);
+            dispose();
+        } finally {
+            if (null != connectionToServer) {
+                try {
+                    connectionToServer.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            if (null != fromServerReader) {
+                try {
+                    fromServerReader.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            if(null != toServerWriter) {
+                toServerWriter.close();
+            }
         }
     }
 
@@ -59,7 +94,8 @@ public class ChatClient extends JFrame implements KeyListener {
         if (e.getKeyCode() == KeyEvent.VK_ENTER) {
             String message = inputTextField.getText();
             if (!message.isEmpty()) {
-                // Senden die Nachricht an Server, wenn der erstellt wird
+                toServerWriter.println(message);
+                toServerWriter.flush();
                 inputTextField.setText("");
             }
         }
@@ -71,6 +107,6 @@ public class ChatClient extends JFrame implements KeyListener {
     }
 
     public static void main(String[] args) {
-        new ChatClient(3141);
+        new ChatClient();
     }
 }

src/main/java/Constants.java

@@ -0,0 +1,5 @@
+public class Constants {
+    public static final int WINDOW_WIDTH  = 800;
+    public static final int WINDOW_HEIGHT = 600;
+    public static final int PORT          = 3141;
+}