Java tutorial
/** * Copyright (C) 2011 JTalks.org Team * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ package org.jtalks.jcommune.web.controller; import org.joda.time.DateTime; import org.jtalks.jcommune.model.entity.JCUser; import org.jtalks.jcommune.plugin.api.exceptions.NotFoundException; import org.jtalks.jcommune.service.UserService; import org.jtalks.jcommune.service.exceptions.ImageProcessException; import org.jtalks.jcommune.web.util.ImageControllerUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.context.MessageSource; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Date; import java.util.HashMap; import java.util.Map; import java.util.concurrent.TimeUnit; import static org.apache.commons.lang3.ObjectUtils.defaultIfNull; /** * Controller for processing avatar related request. * * @author Alexandre Teterin * @author Anuar Nurmakanov * @author Andrei Alikov */ @Controller public class AvatarController extends ImageUploadController { private UserService userService; private ImageControllerUtils avatarControllerUtils; /** * Constructor for controller instantiating, dependencies injected via autowiring. * * @param userService to manipulate user-related data * @param avatarControllerUtils utility object for image-related functions * @param messageSource to resolve locale-dependent messages */ @Autowired public AvatarController(UserService userService, @Qualifier("avatarControllerUtils") ImageControllerUtils avatarControllerUtils, MessageSource messageSource) { super(messageSource); this.userService = userService; this.avatarControllerUtils = avatarControllerUtils; } /** * Process avatar file from request and return avatar preview in response. * Used for IE, Opera specific request processing. * * @param file file, that contains uploaded image * @return ResponseEntity * @throws IOException defined in the JsonFactory implementation, * caller must implement exception processing * @throws ImageProcessException if error occurred while image processing */ @RequestMapping(value = "/users/IFrameAvatarpreview", method = RequestMethod.POST) @ResponseBody public ResponseEntity<String> uploadAvatar(@RequestParam(value = "qqfile") MultipartFile file) throws IOException, ImageProcessException { return createPreviewOfImage(file, avatarControllerUtils); } /** * Process avatar file from request and return avatar preview in response. * Used for FF, Chrome specific request processing * * @param bytes input avatar data * @param response servlet response * @return response content * @throws ImageProcessException if error occurred while image processing */ @RequestMapping(value = "/users/XHRavatarpreview", method = RequestMethod.POST) @ResponseBody public Map<String, String> uploadAvatar(@RequestBody byte[] bytes, HttpServletResponse response) throws ImageProcessException { return createPreviewOfImage(bytes, response, avatarControllerUtils); } /** * Write user avatar in response for rendering it on html pages. * * @param request servlet request * @param response servlet response * @param id user database identifier * @throws NotFoundException if user with given encodedUsername not found * @throws IOException throws if an output exception occurred */ @RequestMapping(value = "/users/{id}/avatar", method = RequestMethod.GET) public void renderAvatar(HttpServletRequest request, HttpServletResponse response, @PathVariable Long id) throws NotFoundException, IOException { JCUser user = userService.get(id); Date ifModifiedDate = super.getIfModifiedSinceDate(request.getHeader(IF_MODIFIED_SINCE_HEADER)); // using 0 unix time if avatar has never changed (the date is null). It's easier to work with something // non-null than to check for null all the time. DateTime avatarLastModificationTime = defaultIfNull(user.getAvatarLastModificationTime(), new DateTime(0)); // if-modified-since header doesn't include milliseconds, so if it floors the value (millis = 0), then // actual modification date will always be after the if-modified-since and we'll always be returning avatar avatarLastModificationTime = avatarLastModificationTime.withMillisOfSecond(0); if (avatarLastModificationTime.isAfter(ifModifiedDate.getTime())) { byte[] avatar = user.getAvatar(); response.setContentType("image/jpeg"); response.setContentLength(avatar.length); response.getOutputStream().write(avatar); } else { response.setStatus(HttpServletResponse.SC_NOT_MODIFIED); } setupAvatarHeaders(response, new Date(avatarLastModificationTime.getMillis())); } /** * Prepare response with default user avatar * * @return JSON string with default user avatar * @throws ImageProcessException due to common avatar processing error * @throws IOException defined in the JsonFactory implementation, caller must implement exception * processing */ @RequestMapping(value = "/defaultAvatar", method = RequestMethod.GET) @ResponseBody public String getDefaultAvatar() throws ImageProcessException, IOException { Map<String, String> responseContent = new HashMap<>(); avatarControllerUtils.prepareNormalResponse(avatarControllerUtils.getDefaultImage(), responseContent); return avatarControllerUtils.getResponceJSONString(responseContent); } }