Class SimpleHttpServer

Java/Simple-http-server/SimpleHttpServer.java:11–41

import java.nio.file.Path;

public class SimpleHttpServer {
    public static void main(String[] args) throws IOException {
        int port = 8080;
        HttpServer server = HttpServer.create(new InetSocketAddress(port), 0);
        server.createContext("/", new FileHandler());
        server.setExecutor(null);
        server.start();
        System.out.println("Server started on port " + port);
    }

    static class FileHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            Path filePath = Path.of("index.html");
            if (!Files.exists(filePath)) {
                String response = "404 Not Found";
                exchange.sendResponseHeaders(404, response.length());
                try (OutputStream os = exchange.getResponseBody()) {
                    os.write(response.getBytes());
                }
                return;
            }

            byte[] fileBytes = Files.readAllBytes(filePath);
            exchange.sendResponseHeaders(200, fileBytes.length);
            try (OutputStream os = exchange.getResponseBody()) {
                os.write(fileBytes);
            }
        }
    }
}