What are some examples of Java socket programming?

What are some examples of Java socket programming?

Java socket programming allows communication between applications over a network. Here are a few examples: 1. A simple client-server application where the client sends a message to the server and receives a response. 2. A chat application where multiple clients can connect to a server and exchange messages. 3. A file transfer application that allows clients to upload and download files from a server.

Can you show me a simple client-server example?

Sure! Here's a basic example:

Server Code:

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

public class SimpleServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(1234);
        System.out.println("Server is listening on port 1234...");
        Socket socket = serverSocket.accept();
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println("Received: " + inputLine);
            out.println("Echo: " + inputLine);
        }
        socket.close();
        serverSocket.close();
    }
}

Client Code:

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

public class SimpleClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 1234);
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        out.println("Hello, Server!");
        System.out.println(in.readLine());
        socket.close();
    }
}

This code sets up a server that listens for connections and echoes back any messages it receives.

What about a chat application example?

For a chat application, you would typically have a server that handles multiple clients. Each client can send messages to the server, which then broadcasts them to all connected clients. Would you like to see a code example for that?