The build-in, simplest HTTP server in Java,

simplest-http-server-in-java.java

package me.imlc.demos;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;

public class JavaHttpServer {

  public static void main(String[] args) throws IOException {
    HttpServer server = HttpServer.create(new InetSocketAddress(8080), 0);
    server.createContext("/hello", new HttpHandler() {
      @Override
      public void handle(HttpExchange exchange) throws IOException {
        String resp = "Hello, world!";
        exchange.sendResponseHeaders(200, resp.length());
        OutputStream os = exchange.getResponseBody();
        os.write(resp.getBytes());
        os.close();
      }
    });
    server.setExecutor(null);
    server.start();
  }

}