JEP 408 - com.sun.net.HttpServer Sınıfı

Giriş

Şu satırı dahil ederiz

import com.sun.net.httpserver.HttpServer;

Açıklaması şöyle

JEP 408 is an enhancement proposal introducing a new feature in #Java 18: a simple HTTP server that is easy to use and requires no external dependencies. This server is designed to be lightweight, easy to configure, and capable of serving static content and dynamic content generated by a Java program.

The new Java Simple Web Server is based on the existing HttpServer class, but it simplifies creating and configuring an HTTP server. It provides a default configuration that is suitable for many use cases, but it also allows for customization through a simple #API.

constructor

Şöyle yaparız

HttpServer server = HttpServer.create(new InetSocketAddress("localhost", 80), 0);

createContext metodu - path
Örnek

Şöyle yaparız. setHandler() metodunu çağırmak gerekir.

server.createContext("/");
server.start();

createContext metodu - path + Handler

Örnek

Şöyle yaparız

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

public static void main(String[] args) throws Exception {
  HttpServer server = HttpServer.create(new InetSocketAddress(3000), 0);
  server.createContext("/", new MyHandler());
  server.setExecutor(Executors.newCachedThreadPool());
  server.start();
}

static class MyHandler implements HttpHandler {
  @Override
  public void handle(HttpExchange t) throws IOException {
    String response = "Hello world!";
    t.sendResponseHeaders(200, response.length());
    OutputStream os = t.getResponseBody();
    os.write(response.getBytes());
    os.close();
  }
}

setExecutor metodu

Örnek

Şöyle yaparız. Burada Executors.newCachedThreadPool() ile sınırsız sayıda thread kullanılıyor

server.setExecutor(Executors.newCachedThreadPool());

Örnek

Şöyle yaparız. Burada Executors.newVirtualThreadPerTaskExecutor() ile Project Loom'a ait Virtual Threads kullanılıyor.

public static void main(String[] args) throws Exception {
  HttpServer server = HttpServer.create(new InetSocketAddress(3000), 0);
  server.createContext("/", new MyHandler());
  server.setExecutor(Executors.newVirtualThreadPerTaskExecutor());
  server.start();
}

static class MyHandler implements HttpHandler {
  @Override
  public void handle(HttpExchange t) throws IOException {
    String response = "Hello world!";
    t.sendResponseHeaders(200, response.length());
    OutputStream os = t.getResponseBody();
    os.write(response.getBytes());
    os.close();
  }
}

setHandler metodu

Örnekler yukarıda

start metodu

Örnek
Şöyle yaparız

server.start();