/
UpdateBookServlet.java
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/
UpdateBookServlet.java
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/* Copyright 2016 Google Inc.
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
package com.example.getstarted.basicactions;
import com.example.getstarted.daos.BookDao;
import com.example.getstarted.objects.Book;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
// [START example]
@SuppressWarnings("serial")
public class UpdateBookServlet extends HttpServlet {
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
IOException {
BookDao dao = (BookDao) this.getServletContext().getAttribute("dao");
try {
Book book = dao.readBook(Long.decode(req.getParameter("id")));
req.setAttribute("book", book);
req.setAttribute("action", "Edit");
req.setAttribute("destination", "update");
req.setAttribute("page", "form");
req.getRequestDispatcher("/base.jsp").forward(req, resp);
} catch (Exception e) {
throw new ServletException("Error loading book for editing", e);
}
}
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
IOException {
BookDao dao = (BookDao) this.getServletContext().getAttribute("dao");
try {
// [START bookBuilder]
Book book = new Book.Builder()
.author(req.getParameter("author"))
.description(req.getParameter("description"))
.id(Long.decode(req.getParameter("id")))
.publishedDate(req.getParameter("publishedDate"))
.title(req.getParameter("title"))
.build();
// [END bookBuilder]
dao.updateBook(book);
resp.sendRedirect("/read?id=" + req.getParameter("id"));
} catch (Exception e) {
throw new ServletException("Error updating book", e);
}
}
}
// [END example]