Java class for embedded HTTP server in Swing app

If you're not using Java 6, then I would certainly recommend Jetty. That works very well and has a decent programming interface.

Since Java 6, the JDK contains a simple HTTP server implementation.

Example usage:

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Executors;

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

public class HttpServerDemo {
  public static void main(String[] args) throws IOException {
    InetSocketAddress addr = new InetSocketAddress(8080);
    HttpServer server = HttpServer.create(addr, 0);

    server.createContext("/", new MyHandler());
    server.setExecutor(Executors.newCachedThreadPool());
    server.start();
    System.out.println("Server is listening on port 8080" );
  }
}

class MyHandler implements HttpHandler {
  public void handle(HttpExchange exchange) throws IOException {
    String requestMethod = exchange.getRequestMethod();
    if (requestMethod.equalsIgnoreCase("GET")) {
      Headers responseHeaders = exchange.getResponseHeaders();
      responseHeaders.set("Content-Type", "text/plain");
      exchange.sendResponseHeaders(200, 0);

      OutputStream responseBody = exchange.getResponseBody();
      Headers requestHeaders = exchange.getRequestHeaders();
      Set<String> keySet = requestHeaders.keySet();
      Iterator<String> iter = keySet.iterator();
      while (iter.hasNext()) {
        String key = iter.next();
        List values = requestHeaders.get(key);
        String s = key + " = " + values.toString() + "\n";
        responseBody.write(s.getBytes());
      }
      responseBody.close();
    }
  }
}

Or you can use Jetty for that purpose. It’s quite lightweight and perfectly fits this purpose.

You can use jetty as embedded server, its fairly light weight. Other option is check this out for a simple java class to handle http requests http://java.sun.com/developer/technicalArticles/Networking/Webserver/.

Other way is in Java 6 you can use com.sun.net.httpserver.HttpServer

Sun embedded web server is useful, but com.sun.net package could be dropped without notice. A better alternative are

• http://tjws.sourceforge.net/ 100kb very small and jdk 1.6-aware
• http://winstone.sourceforge.net/ bigger but a good shot
• http://www.eclipse.org/jetty/ Jetty, very good in developement, support SPDY and websocket