SimpleHttpServer.java

import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpExchange
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
public class SimpleHttpServer
{
    public static void main(String[] args) throws IOException {
            HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
            server.createContext("/", new RootHandler());
            server.start();
    }

    static class RootHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            String response = "Hello, World!";
            exchange.sendResponseHeaders(200, response.length());
            exchange.getResponseHeaders().add("content-type", "application/json");
            try (OutputStream os = exchange.getResponseBody()) {
                os.write(response.getBytes());}}}
}