SNSPusher.java

package kr.ac.kaist.resl.lilliput.core;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

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

import kr.ac.kaist.resl.lilliput.util.MongoHelper;

import org.apache.commons.io.IOUtils;

import com.restfb.DefaultFacebookClient;
import com.restfb.FacebookClient;
import com.restfb.Parameter;
import com.restfb.types.FacebookType;

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

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		String epc = (String)request.getParameter("epc");
		String message = (String)request.getParameter("message");

		pushToFacebook(epc,message);		
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}
	
	public void pushToFacebook(String epc, String message)
	{
		try
		{		
			MongoHelper mHelper = new MongoHelper();
			//epc�� fid�� ã�Ƽ� 
			String fid = mHelper.getFacebookID(epc);
			
			URL url = new URL("https://graph.facebook.com/oauth/access_token?client_id=136511403124173&client_secret=6d2d602142b59b0df5738c7a151c66cf&grant_type=client_credentials");
			URLConnection con = url.openConnection();
			InputStream in = con.getInputStream();
			String encoding = con.getContentEncoding();
			encoding = encoding == null ? "UTF-8" : encoding;
			String body = IOUtils.toString(in, encoding);
			String[] tokens = body.split("=");		
			String accessToken = mHelper.getAccessToken(epc);	
			
			FacebookClient facebookClient = new DefaultFacebookClient(accessToken);
			
			facebookClient.publish(fid + "/feed", FacebookType.class, Parameter.with("message", message ));
			return;
		}
		catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return;
	}
}