Java 最小的 WebServer

无意间发现 jdk 里是有 HttpServer 的。
于是乎 Java 在浏览器里输出 Hello World 的最小实现。

import  com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;

 public class App {
    public static void main(String[] args) {
        try {
            HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
			server.createContext("/", (exchange) -> {
				  String response = "Hello World!";
				  exchange.sendResponseHeaders(200, response.length());
				  OutputStream os = exchange.getResponseBody();
				  os.write(response.getBytes());
				  os.close();
			});
			server.setExecutor(null); // creates a default executor
			server.start();
			System.out.println("start");
		} catch (IOException e) {
				  e.printStackTrace();
		}
    }
}