SignGuestbookServlet.java

/**
 * Copyright 2016 Google Inc.
 *
 * <p>Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */

//[START all]
package com.example.guestbook;

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

import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//[START all]
public class SignGuestbookServlet extends HttpServlet {
  // Process the HTTP POST of the form
  @Override
  public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
    Greeting greeting;

    UserService userService = UserServiceFactory.getUserService();
    User user = userService.getCurrentUser(); // Find out who the user is.

    String guestbookName = req.getParameter("guestbookName");
    String content = req.getParameter("content");
    if (user != null) {
      greeting = new Greeting(guestbookName, content, user.getUserId(), user.getEmail());
    } else {
      greeting = new Greeting(guestbookName, content);
    }

    greeting.save();

    resp.sendRedirect("/guestbook.jsp?guestbookName=" + guestbookName);
  }
}
//[END all]