How to imitate Tmall online Mall by Java

Editor to share with you how to achieve Java to imitate Tmall online mall, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

I. brief introduction of the project

Features:

Front desk:

* user module

* Classification module

* Product module

* Shopping cart module

* order module

Background:

* Manager module

* Classification management module

* Commodity management module

* order module

II. Project operation

Environment configuration: Jdk1.8 + Tomcat8.5 + mysql + Eclispe (both supported by IntelliJ IDEA,Eclispe,MyEclispe,Sts)

Project technology: JSP + C3P0 + Servlert + html+ css + JavaScript + JQuery + Ajax + Fileupload and so on.

Basic information operation code: basic information operation: public abstract class BaseBackServlet extends HttpServlet {/ * add * / public abstract String add (HttpServletRequest request, HttpServletResponse response, Page page); / * delete * / public abstract String delete (HttpServletRequest request, HttpServletResponse response, Page page); / * update * / public abstract String update (HttpServletRequest request, HttpServletResponse response, Page page); / * modify * / public abstract String edit (HttpServletRequest request, HttpServletResponse response, Page page) / * display * / public abstract String list (HttpServletRequest request, HttpServletResponse response, Page page); protected CategoryDAO categoryDAO = new CategoryDAO (); protected OrderDAO orderDAO = new OrderDAO (); protected OrderItemDAO orderItemDAO = new OrderItemDAO (); protected ProductDAO productDAO = new ProductDAO (); protected ProductImageDAO productImageDAO = new ProductImageDAO (); protected PropertyDAO propertyDAO = new PropertyDAO (); protected PropertyValueDAO propertyValueDAO = new PropertyValueDAO (); protected ReviewDAO reviewDAO = new ReviewDAO (); protected UserDAO userDAO = new UserDAO () Override protected void service (HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {try {/ * get paging information * / int start = 0; int count = 5; try {start = Integer.parseInt (req.getParameter ("page.start")); count = Integer.parseInt (req.getParameter ("page.count")) } catch (Exception e) {} Page page = new Page (start, count); / * with reflection, call the corresponding method * / String method = (String) req.getAttribute ("method"); Method m = this.getClass () .getMethod (method, HttpServletRequest.class, HttpServletResponse.class, Page.class) String redirect = m.invoke (this, req, resp, page). ToString (); / * make the corresponding client or server jump according to the returned value of the method, or output only the string * / if (redirect.startsWith ("@")) {resp.sendRedirect (redirect.substring (1)) } else if (redirect.startsWith ("%")) {resp.getWriter (). Print (redirect.substring (1));} else {req.getRequestDispatcher (redirect) .forward (req, resp);}} catch (NoSuchMethodException e) {e.printStackTrace ();} catch (IllegalAccessException e) {e.printStackTrace () } catch (InvocationTargetException e) {e.printStackTrace ();}} public InputStream parseUpload (HttpServletRequest request, Map params) {InputStream is = null; try {DiskFileItemFactory factory = new DiskFileItemFactory (); ServletFileUpload upload = new ServletFileUpload (factory); / / set the file size limit to 10m factory.setSizeThreshold (1024 * 1024) List items = upload.parseRequest (request); Iterator iter = items.iterator (); while (iter.hasNext ()) {FileItem item = (FileItem) iter.next (); if (! item.isFormField ()) {/ / get the input stream is = item.getInputStream () of the uploaded file } else {String paramName = item.getFieldName (); String paramValue = item.getString (); paramValue = new String (paramValue.getBytes ("ISO-8859-1"), "UTF-8"); params.put (paramName, paramValue) } catch (FileUploadException e) {e.printStackTrace ();} catch (UnsupportedEncodingException e) {e.printStackTrace ();} catch (IOException e) {e.printStackTrace ();} return is }} user information operation code: user information operation: public class UserServlet extends BaseBackServlet {@ Override public String add (HttpServletRequest request, HttpServletResponse response, Page page) {System.out.println ("UserServlet add method called"); return null;} @ Override public String delete (HttpServletRequest request, HttpServletResponse response, Page page) {System.out.println ("UserServlet delete method called") Int id = Integer.parseInt (request.getParameter ("id")); userDAO.delete (id); return "@ admin_user_list";} @ Override public String update (HttpServletRequest request, HttpServletResponse response, Page page) {System.out.println ("UserServlet update method called"); Map params = new HashMap (); InputStream is = super.parseUpload (request, params); System.out.println (params) Int id = Integer.parseInt (params.get ("id")); String password = params.get ("password"); User user = userDAO.get (id); user.setPassword (password); userDAO.update (user); return "@ admin_user_list";} @ Override public String edit (HttpServletRequest request, HttpServletResponse response, Page page) {System.out.println ("UserServlet edit method called") Int id = Integer.parseInt (request.getParameter ("id")); User u = userDAO.get (id); request.setAttribute ("u", u); return "admin/editUser.jsp";} @ Override public String list (HttpServletRequest request, HttpServletResponse response, Page page) {System.out.println ("UserServlet list method called"); List us = userDAO.list (page.getStart (), page.getCount ()) Int total = userDAO.getTotal (); page.setTotal (total); request.setAttribute ("us", us); request.setAttribute ("page", page); return "admin/listUser.jsp";}} these are all the contents of the article "how Java can imitate Tmall online Mall". 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