assignment for socket programming.

Author: Gokul2003g

Records/21CYS/CB.EN.U4CYS21018/assignment/12-06-cbenu4cys21018-gokul/Main.java

@@ -0,0 +1,93 @@
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+public class Main {
+
+  abstract static class FileTransfer {
+
+    void sendFile(String fileName) {
+      // Default implementation for sending a file
+      System.out.println("Sending file: " + fileName);
+    }
+
+    abstract void saveFile(byte[] fileData, String fileName);
+  }
+
+  public interface FileTransferListener {
+    void onFileSent(String fileName);
+    void onFileSaved(String fileName);
+  }
+
+  public static class FileTransferClient extends FileTransfer implements FileTransferListener {
+
+    void sendFile(String fileName) {
+      // Custom implementation for sending a file using socket programming
+      System.out.println("Sending file over the network: " + fileName);
+    }
+
+    public void onFileSaved(String fileName) {
+      System.out.println("File saved on the client side: " + fileName);
+    }
+
+    public void onFileSent(String fileName) {
+      System.out.println("File sent from the client side: " + fileName);
+    }
+
+    void saveFile(byte[] fileData, String fileName) {
+      // Not applicable for the client side
+    }
+  }
+
+  public static class FileTransferServer extends FileTransfer implements FileTransferListener {
+
+    @Override
+    void saveFile(byte[] fileData, String fileName) {
+      try {
+        FileOutputStream fileOutputStream = new FileOutputStream(fileName);
+        fileOutputStream.write(fileData);
+        fileOutputStream.close();
+      } catch (IOException e) {
+        System.out.println("Failed to save file: " + fileName);
+        return;
+      }
+
+      onFileSaved(fileName);
+    }
+
+    void sendFile(String fileName) {
+      // Not applicable for the server side
+    }
+
+    public void onFileSaved(String fileName) {
+      System.out.println("File saved on the server side: " + fileName);
+    }
+
+    public void onFileSent(String fileName) {
+      System.out.println("File sent from the server side: " + fileName);
+    }
+
+    void start() {
+      // Server initialization and listening for incoming file transfers
+      System.out.println("Server started. Listening for incoming file transfers.");
+    }
+  }
+
+  public static void main(String[] args) {
+    FileTransferClient client = new FileTransferClient();
+    FileTransferServer server = new FileTransferServer();
+    
+    // Start the server to listen for incoming file transfers
+    server.start();
+
+    // Demonstrate sending a file from the client to the server
+    client.sendFile("file.txt");
+
+    // Demonstrate saving a file on the server
+    byte[] fileData = "This has been overwritten from here".getBytes();
+    server.saveFile(fileData, "file.txt");
+    
+    // print the contents of the file from server side
+    System.out.println("File contents on the server side: " + new String(fileData));
+    
+  }
+}