Control.java

package bastide.pi.bbq;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.PinMode;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.RaspiPin;

/**
 * Servlet implementation class Control
 */
@WebServlet("/Control")
public class Control extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Control() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * simple processing of the status flag for the servlet
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String param = request.getParameter("status");
		
		if(param!=null && !param.isEmpty()){
			boolean status = Boolean.parseBoolean(param);
			
			final GpioController gpio = GpioFactory.getInstance();
			// RaspiPin.GPIO_23);

	        final GpioPinDigitalOutput pin = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_23, "MyLED", PinState.HIGH);
	        
			gpio.setMode(PinMode.DIGITAL_OUTPUT, pin);
	        
	        System.out.println("--> GPIO state should be: " + status);
		}
	}

}