In Java, you can establish a TCP connection and write data to a network socket using the Socket and OutputStream classes. This is commonly done when implementing network communication applications, such as client-server systems or network protocols.

Below is an example code that demonstrates how to write to a network socket using the TCP protocol in Java:

import java.io.*;
import java.net.*;

public class TCPClient {

    public static void main(String[] args) {
        String serverHostname = "example.com";
        int serverPort = 1234;

        try {
            // Connect to the server
            Socket socket = new Socket(serverHostname, serverPort);

            // Get the output stream
            OutputStream outputStream = socket.getOutputStream();

            // Create a writer to write data to the stream
            PrintWriter writer = new PrintWriter(outputStream, true);

            // Write data to the socket
            String message = "Hello, server!";
            writer.println(message);

            // Close the writer and socket
            writer.close();
            socket.close();
        } catch (UnknownHostException e) {
            System.err.println("Error: Unknown host " + serverHostname);
        } catch (IOException e) {
            System.err.println("Error: I/O exception occurred");
        }
    }
}

In the code above, we first specify the server hostname and port number that we want to connect to. Then, we create a Socket object by providing the server’s hostname and port. We obtain the output stream from the socket using the getOutputStream() method.

To write data to the socket, we create a PrintWriter object and pass the output stream to its constructor. The println() method is then used to write the data to the socket. Finally, we close the writer and socket to release resources.

Remember to replace example.com with the actual hostname of the server you want to connect to, and 1234 with the appropriate port number.

By following the above example, you can easily write data to a network socket using TCP protocol in Java. This can be utilized in various network communication scenarios, enabling seamless data exchange between client and server systems.

#TCPProtocol #JavaNetworkCommunication