图书销售系统

package com.atguigu.web_bookstore.util; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.URLDecoder; import java.net.URLEncoder; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.UUID; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.fileupload.util.Streams; import com.atguigu.web_bookstore.bean.Book; import com.atguigu.web_bookstore.bean.Cart; import com.atguigu.web_bookstore.bean.User; /* * Web层处理的工具类 */ public class WebUtils { /** * 将请求中的请求参数数据封装到指定类型的对象中, 并返回 * * @param request * @param beanClass * @return */ public static <T> T request2Bean(HttpServletRequest request, Class<T> beanClass) { T t = null; try { t = beanClass.newInstance(); // 从request中取出所有请求参数(名和值),设置到t对象的对应属性中 Map<String, Object> map = request.getParameterMap(); for (String name : map.keySet()) { Object value = map.get(name); BeanUtils.copyProperty(t, name, value); } if (request.getParameter("id") == null) {// 如果请求参数没有携带id // 给对象设置一个UUID工具类产生的一个36位随机值 BeanUtils.copyProperty(t, "id", UUID.randomUUID().toString()); } } catch (Exception e) { e.printStackTrace(); } return t; } /** * 转发请求到/result.jsp页面, 显示指定的提示信息 * * @param request * @param response * @param message * @throws ServletException * @throws IOException */ public static void forwordMessageUI(HttpServletRequest request, HttpServletResponse response, String message) throws ServletException, IOException { request.setAttribute("message", message); request.getRequestDispatcher("/result.jsp").forward(request, response); } /** * 转发请求到指定路径, 并保存指定的请求域属性 * * @param request * @param response * @param path * @param name * @param value * @throws ServletException * @throws IOException */ public static void forword(HttpServletRequest request, HttpServletResponse response, String path, String name, Object value) throws ServletException, IOException { request.setAttribute(name, value); request.getRequestDispatcher(path).forward(request, response); } /** * 检查用户是否登陆 * @param request * @param response * @return */ public static User checkUser(HttpServletRequest request, HttpServletResponse response) { User user = null; user = (User) request.getSession().getAttribute("user"); if (user == null) { Cookie[] cookies = request.getCookies(); if (cookies != null && cookies.length > 0) { for (Cookie c : cookies) { String name = c.getName(); if ("user".equals(name)) { String value = c.getValue(); String[] namePassword = value.split(","); user = new User(namePassword[0], namePassword[1], namePassword[2], null); request.getSession().setAttribute("user", user); break; } } } } return user; } /** * 登陆 * @param request * @param response * @param user * @param auto */ public static void login(HttpServletRequest request, HttpServletResponse response, User user, boolean auto) { HttpSession session = request.getSession(); session.setAttribute("user", user); if (auto) { Cookie c = new Cookie("user", user.getId() + "," + user.getUsername() + "," + user.getPassword()); c.setMaxAge(60 * 60 * 24 * 30); c.setPath("/"); response.addCookie(c); } } /** * 登出 * @param request * @param response */ public static void logout(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(); session.removeAttribute("user"); Cookie c = new Cookie("user", ""); c.setMaxAge(0); c.setPath("/"); response.addCookie(c); } /** * 添加到浏览历史 * @param request * @param response * @param book */ public static void addToHistory(HttpServletRequest request, HttpServletResponse response, Book book) { // cookie的key是由bookName_currentTime // book.jsp?book=JavaWeb // 获取cookie Cookie[] cs = request.getCookies(); int count = 0; Cookie deleteCookie = null; // 删除其中的一个cookie if (cs != null && cs.length > 0) { for (int i = 0; i < cs.length; i++) { String name = cs[i].getName(); if(name.startsWith("book_")) { if (name.startsWith("book_" + book.getId())) { cs[i].setMaxAge(0); response.addCookie(cs[i]); break; } else { count++; if(deleteCookie==null) { deleteCookie = cs[i]; } } } } if (count == 4) { // 将cookie数组中的第一个删除 deleteCookie.setMaxAge(0); response.addCookie(deleteCookie); } } try { Cookie c = new Cookie("book_" + book.getId(), URLEncoder.encode(book.getName(), "utf-8")); c.setMaxAge(60 * 60 * 24 * 30); response.addCookie(c); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 得到浏览过的所有图书 * @param request * @return */ public static List<Map<String, String>> getHistoryBooks(HttpServletRequest request) { List<Map<String, String>> list = new ArrayList<Map<String, String>>(); Cookie[] cs = request.getCookies(); if(cs!=null && cs.length>0) { for(int i=cs.length-1;i>=0;i--) { Cookie c = cs[i]; String cName = c.getName(); if(cName.startsWith("book_")) { String id = cName.substring(cName.indexOf("_")+1); String name = URLDecoder.decode(c.getValue()); Map<String, String> map = new HashMap<>(); map.put("id", id); map.put("name", name); list.add(map); } } } return list; } /** * 清空浏览历史 * @param request * @param resp */ public static void clearHistory(HttpServletRequest request, HttpServletResponse resp) { Cookie[] cs = request.getCookies(); if(cs!=null && cs.length>0) { for(int i=cs.length-1;i>=0;i--) { Cookie c = cs[i]; String cName = c.getName(); if(cName.startsWith("book_")) { c.setMaxAge(0); resp.addCookie(c); } } } } public static Cart getCart(HttpServletRequest request) { HttpSession session = request.getSession(); Cart cart = (Cart) session.getAttribute("CART"); if(cart==null) { cart = new Cart(); session.setAttribute("CART", cart); } return cart; } /* * 生成订单号,订单号的组成 两位年+两位月+两位日+两位小时+当天的订单总数 如:11071012100 * * @param count * * @return */ public static String buildOrderid(long count) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyMMddHH");// 2011-07-10 StringBuilder out = new StringBuilder(dateFormat.format(new Date())); int length = 15; int countLength = String.valueOf(out).length(); int zeroLength = length - countLength; for (int i = 0; i < zeroLength; i++) { out.append(0); } out.append(count); return out.toString(); } /** * 上传图书图片 * @param request * @return */ public static Book uploadBook(HttpServletRequest request) { Book book = new Book(); String id = UUID.randomUUID().toString(); book.