基于JavaWeb的网上电子商城管理系统源码(MVC开发毕设项目).zip

package com.xmut.estore.servlet; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.xmut.estore.domain.ShoppingCart; import com.xmut.estore.web.EStoreWebUtils; import com.xmut.estore.service.UserService; import com.xmut.estore.domain.Account; import com.xmut.estore.domain.ShoppingCartItem; import com.xmut.estore.domain.User; import com.xmut.estore.service.AccountService; import com.xmut.estore.web.EStoreWebUtils; import com.google.gson.Gson; import com.xmut.estore.domain.Computer; import com.xmut.estore.service.ComputerService; import com.xmut.estore.web.CriteriaComputer; import com.xmut.estore.web.Page; public class ComputerServlet extends HttpServlet { private ComputerService computerService = new ComputerService(); private UserService userService = new UserService(); private AccountService accountService = new AccountService(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } //method反射机制调用方法 @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String methodName = request.getParameter("method"); try { // 利用反射获取方法 Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class,HttpServletResponse.class); // 执行相应的方法 method.setAccessible(true); method.invoke(this, request,response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } protected void cash(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 简单验证: 验证表单域的值是否符合基本的规范: 是否为空, 是否可以转为 int 类型, 是否是一个 email. 不需要进行查询 //数据库或调用任何的业务方法. String username = request.getParameter("username"); String accountId = request.getParameter("accountId"); StringBuffer errors = validateFormField(username, accountId); //表单验证通过。 if(errors.toString().equals("")){ errors = validateUser(username, accountId); //用户名和账号验证通过 if(errors.toString().equals("")){ errors = validateComputerStoreNumber(request); //库存验证通过 if(errors.toString().equals("")){ errors = validateBalance(request, accountId); } } } if(!errors.toString().equals("")){ request.setAttribute("errors", errors); request.getRequestDispatcher("/WEB-INF/pages/cash.jsp").forward(request, response); return; } //验证通过执行具体的逻辑操作 computerService.cash(EStoreWebUtils.getShoppingCart(request), username, accountId); response.sendRedirect(request.getContextPath() + "/success.jsp"); } //验证余额是否充足 public StringBuffer validateBalance(HttpServletRequest request, String accountId){ StringBuffer errors = new StringBuffer(""); ShoppingCart cart = EStoreWebUtils.getShoppingCart(request); Account account = accountService.getAccount(Integer.parseInt(accountId)); if(cart.getTotalMoney() > account.getBalance()){ errors.append("余额不足!"); } return errors; } //验证库存是否充足 public StringBuffer validateComputerStoreNumber(HttpServletRequest request){ StringBuffer errors = new StringBuffer(""); ShoppingCart cart = EStoreWebUtils.getShoppingCart(request); for(ShoppingCartItem sci: cart.getItems()){ int quantity = sci.getQuantity(); int storeNumber = computerService.getComputer(sci.getComputer().getId()).getStoreNumber(); if(quantity > storeNumber){ errors.append(sci.getComputer().getBrand()+sci.getComputer().getModel() + "库存不足<br>"); } } return errors; } //验证用户名和账号是否匹配 public StringBuffer validateUser(String username, String accountId){ boolean flag = false; User user = userService.getUserByUserName(username); if(user != null){ int accountId2 = user.getAccountId(); if(accountId.trim().equals("" + accountId2)){ flag = true; } } StringBuffer errors2 = new StringBuffer(""); if(!flag){ errors2.append("用户名和账号不匹配"); } return errors2; } //验证表单域是否符合基本的规则: 是否为空. public StringBuffer validateFormField(String username, String accountId){ StringBuffer errors = new StringBuffer(""); if(username == null || username.trim().equals("")){ errors.append("用户名不能为空<br>"); } if(accountId == null || accountId.trim().equals("")){ errors.append("账号不能为空"); } return errors; } protected void updateItemQuantity(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //4. 在 updateItemQuantity 方法中, 获取 quanity, id, 再获取购物车对象, 调用 service 的方法做修改 String idStr = request.getParameter("id"); String quantityStr = request.getParameter("quantity"); ShoppingCart sc = EStoreWebUtils.getShoppingCart(request); int id = -1; int quantity = -1; try { id = Integer.parseInt(idStr); quantity = Integer.parseInt(quantityStr); } catch (Exception e) {} if(id > 0 && quantity > 0) computerService.updateItemQuantity(sc, id, quantity); //5. 传回 JSON 数据: computerNumber:xx, totalMoney Map<String, Object> result = new HashMap<String, Object>(); result.put("computerNumber", sc.getComputerNumber()); result.put("totalMoney", sc.getTotalMoney()); Gson gson = new Gson(); String jsonStr = gson.toJson(result); response.setContentType("text/javascript"); response.getWriter().print(jsonStr); } protected void remove(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String idStr = request.getParameter("id"); int id = -1; boolean flag = false; try { id = Integer.parseInt(idStr); } catch (Exception e) {} ShoppingCart sc = EStoreWebUtils.getShoppingCart(request); computerService.removeItemFromShoppingCart(sc, id); if(sc.isEmpty()){ request.getRequestDispatcher("/WEB-INF/pages/emptycart.jsp").forward(request, response); return; } request.getRequestDispatcher("/WEB-INF/pages/cart.jsp").forward(request, response); } protected void clear(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ShoppingCart sCart = EStoreWebUtils.getShoppingCart(request); computerService.clearShoppingCart(sCart); request.getRequestDispatcher("/WEB-INF/pages/emptycart.jsp").forward(request, response); } //跳转页面 protected void forwardPage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String page = request.getParameter("page"); request.getRequestDispatcher("/WEB-INF/pages/" + page + ".jsp").forward(request, response); } //添加到购物车 protected void addToCart(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 获取商品的 id String idStr = request.getParameter("id"); int id = -1; boolean flag = false; try { id = Integer.parseInt(idStr); } catch (Exception e) {} if(id > 0){ //2. 获取购物车对象 ShoppingCart sc = EStoreWebUtils.getShoppingCart(request); //3. 调用 ComputerService 的 addToCart() 方法把商品放到购物车中 flag = computerService.addToCart(id, sc); } if(flag){ //4. 直接调用 getComputers() 方法. getComputers(request, re