Java sending and receiving file (byte[]) over sockets

Java sending and receiving file (byte[]) over sockets

To send and receive a file as a byte array over sockets in Java, you can follow these steps. In this example, I'll demonstrate how to send a file from the client to the server. You can adapt the code for your specific needs.

Server (Receiver):

import java.io.*; import java.net.*; public class Server { public static void main(String[] args) { try (ServerSocket serverSocket = new ServerSocket(12345)) { System.out.println("Server is waiting for a connection..."); Socket clientSocket = serverSocket.accept(); System.out.println("Connection established with " + clientSocket.getInetAddress()); InputStream inputStream = clientSocket.getInputStream(); FileOutputStream fileOutputStream = new FileOutputStream("received_file.txt"); byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = inputStream.read(buffer)) != -1) { fileOutputStream.write(buffer, 0, bytesRead); } System.out.println("File received successfully."); fileOutputStream.close(); inputStream.close(); clientSocket.close(); } catch (IOException e) { e.printStackTrace(); } } }

Client (Sender):

import java.io.*; import java.net.*; public class Client { public static void main(String[] args) { try (Socket socket = new Socket("localhost", 12345)) { System.out.println("Connected to server."); File fileToSend = new File("file_to_send.txt"); FileInputStream fileInputStream = new FileInputStream(fileToSend); OutputStream outputStream = socket.getOutputStream(); byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = fileInputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, bytesRead); } System.out.println("File sent successfully."); outputStream.close(); fileInputStream.close(); } catch (IOException e) { e.printStackTrace(); } } }

In this example:

  1. The server waits for a connection on port 12345 and accepts it when a client connects.

  2. The client connects to the server using the server's IP address and port number.

  3. The client reads a file (file_to_send.txt) and sends it as a byte array to the server.

  4. The server receives the byte array and writes it to a file (received_file.txt).

  5. Both client and server close their streams and sockets when they are done.

Remember to replace "localhost" with the server's actual IP address if the server is running on a different machine.

This is a basic example, and in practice, you may want to add error handling, file existence checks, and more robust communication protocols for handling different file types and scenarios.

More Tags

navbar youtube-data-api e-commerce apache-poi stripe-payments recode signal-handling grpc-java linux-mint project-reference

More Java Questions

More Biology Calculators

More Genetics Calculators

More General chemistry Calculators

More Livestock Calculators