Java tutorial
/* * Copyright 2005-2008 the original author or authors. * * 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.opencredo.portlet; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import javax.portlet.ActionRequest; import javax.portlet.ActionResponse; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.propertyeditors.CustomDateEditor; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.validation.BindingResult; import org.springframework.web.bind.annotation.InitBinder; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.SessionAttributes; import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor; import org.springframework.web.portlet.bind.PortletRequestDataBinder; import org.springframework.web.portlet.util.PortletUtils; import com.opencredo.domain.Book; import com.opencredo.domain.BookValidator; import com.opencredo.service.BookService; @Controller("bookController") @RequestMapping("VIEW") @SessionAttributes("book") public class BooksController { private BookValidator bookValidator = new BookValidator(); private BookService bookService; @Autowired public BooksController(@Qualifier("bookService") BookService bookService) { this.bookService = bookService; } // setup binder for adding/editing books @InitBinder protected void initBinder(PortletRequestDataBinder binder) { SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy", Locale.US); binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true)); binder.registerCustomEditor(byte[].class, new ByteArrayMultipartFileEditor()); binder.setAllowedFields( new String[] { "author", "title", "description", "availability", "count", "website", "coverPng" }); } // default: show list of books @RequestMapping public String listBooks(Model model) { model.addAttribute("books", bookService.getAllBooks()); return "books"; } // view details of a book @RequestMapping(params = "action=viewBook") public String viewBook(@RequestParam("book") Integer id, Model model) { model.addAttribute("book", bookService.getBook(id)); return "bookView"; } // increment/decrement book count @RequestMapping(params = "action=incrementBook") public void incrementBook(ActionResponse response, @RequestParam("book") Integer id, @RequestParam("increment") Integer increment) { Book book = bookService.getBook(id); book.incrementCount(increment); bookService.saveBook(book); } // delete a book @RequestMapping(params = "action=deleteBook") public void deleteBook(ActionResponse response, @RequestParam("book") Integer id) { bookService.deleteBook(id); } // redirect to book website @RequestMapping(params = "action=redirectBook") public void redirectToBookWebsite(ActionResponse response, @RequestParam("book") Integer id) throws IOException { Book book = bookService.getBook(id); if (book != null && book.getWebsite() != null) { response.sendRedirect(book.getWebsite().toString()); } } // add a book @RequestMapping(params = "action=addBook") // render phase public String showAddBookForm(Model model) { if (!model.containsAttribute("book")) { model.addAttribute("book", new Book()); model.addAttribute("page", 0); } return "bookAdd"; } @RequestMapping(params = "action=addBook") // action phase public void submitAddBookFormPage(ActionRequest request, ActionResponse response, @ModelAttribute("book") Book book, BindingResult result, @RequestParam("_page") int currentPage, Model model) { if (request.getParameter("_cancel") != null) { } else if (request.getParameter("_finish") != null) { bookValidator.validate(book, result); if (result.hasErrors()) { model.addAttribute("page", currentPage); response.setRenderParameter("action", "addBook"); } else { bookService.addBook(book); } } else { switch (currentPage) { case 0: bookValidator.validateAuthor(book, result); break; case 1: bookValidator.validateTitle(book, result); break; case 2: bookValidator.validateDescription(book, result); break; case 3: bookValidator.validateAvailability(book, result); break; case 4: bookValidator.validateCount(book, result); break; case 5: bookValidator.validateWebsite(book, result); break; case 6: bookValidator.validateCoverPng(book, result); break; default: ; } int targetPage = result.hasErrors() ? currentPage : PortletUtils.getTargetPage(request, "_target", currentPage); model.addAttribute("page", targetPage); response.setRenderParameter("action", "addBook"); } } // edit a book @RequestMapping(params = "action=editBook") // render phase public String showEditBookForm(@RequestParam("book") Integer id, Model model) { if (!model.containsAttribute("book")) { model.addAttribute("book", bookService.getBook(id)); } return "bookEdit"; } @RequestMapping(params = "action=editBook") // action phase public void submitEditBookForm(ActionRequest request, ActionResponse response, @ModelAttribute("book") Book book, BindingResult result) { bookValidator.validate(book, result); if (result.hasErrors()) { response.setRenderParameter("action", "editBook"); response.setRenderParameter("book", book.getKey().toString()); } else { bookService.saveBook(book); response.setRenderParameter("action", "viewBook"); response.setRenderParameter("book", book.getKey().toString()); } } }