Login Example Gae

logingae

package br.faccamp.servlets;

import java.io.IOException;

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

import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

@SuppressWarnings("serial")
public class LoginServlet extends HttpServlet {
	public void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
 
		UserService userService = UserServiceFactory.getUserService();
		User user = userService.getCurrentUser();
 
		resp.setContentType("text/html");
		resp.getWriter().println("<h2>GAE - Integrating Google user account</h2>");
 
		if (user != null) {
 
			resp.getWriter().println("Welcome, " + user.getNickname());
			resp.getWriter().println(
				"<a href='"
					+ userService.createLogoutURL(req.getRequestURI())
					+ "'> LogOut </a>");
 
		} else {
 
			resp.getWriter().println(
				"Please <a href='"
					+ userService.createLoginURL(req.getRequestURI())
					+ "'> LogIn </a>");
 
		}
	}
}