1.Ajax验证用户名

1.程序框架图

2.修改MemberServlet

    //根据注册名判断数据库中是否存在并返回json格式的结果public void isExistName(HttpServletRequest req, HttpServletResponse resp) throws IOException {//获取用户名String username = req.getParameter("username");//判断是否存在boolean res = memberService.isExistsUsername(username);//返回json格式，使用map形式Map<String, Boolean> map = new HashMap<>();map.put("isExist", res);//转换成json格式Gson gson = new Gson();String json = gson.toJson(map);resp.getWriter().write(json);}

3.修改login.jsp

            //绑定失去焦点事件$("#username").blur(function () {//获取信息，并向后端发送ajax请求var username = $(this).val();$.getJSON("memberServlet",{"action": "isExistName","username": username},function (data, status, xhr) {//根据是否存在显示信息if (data.isExist) {$("span.errorMsg").text("用户名已存在！");} else {$("span.errorMsg").text("用户名可用！");}})})

4.结果展示

2.Ajax判断验证码是否输入正确

1.修改MemberServlet

    //根据验证码判断是否正确，返回json格式的结果public void judgementCodeText(HttpServletRequest req, HttpServletResponse resp) throws IOException {//获取验证码String codeText = req.getParameter("codeText");//获取验证码HttpSession session = req.getSession();Object kaptchaSessionKey = session.getAttribute(KAPTCHA_SESSION_KEY);boolean res = false;if (kaptchaSessionKey != null && ((String) kaptchaSessionKey).equalsIgnoreCase(codeText)) {res = true;}//将信息保存在map中并以json格式返回Map<String, Object> map = new HashMap<>();map.put("judgementCodeText", res);Gson gson = new Gson();String json = gson.toJson(map);resp.getWriter().write(json);}

2.修改login.jsp

            //验证码绑定失去焦点事件$("#code").blur(function () {var codeText = $(this).val();//发送Ajax请求$.getJSON("memberServlet",{"action": "judgementCodeText","codeText": codeText},function (data, status, xhr) {//根据是否存在显示信息if (data.judgementCodeText) {$("span.errorMsg").text("验证码正确！");} else {$("span.errorMsg").text("验证码错误！");}})})

3.结果展示

3.Ajax添加购物车

1.程序框架图

2.修改CartServlet

    //根据物品信息添加到购物车，并以json格式返回数据public void addItemByAjax(HttpServletRequest req, HttpServletResponse resp) throws IOException {//获取前端物品信息Integer cartItemId = DataUtils.parseInt(req.getParameter("cartItemId"), -1);String cartItemName = req.getParameter("cartItemName");BigDecimal cartItemPrice = new BigDecimal(req.getParameter("cartItemPrice"));//计算剩余数据项Integer cartItemCount = 1;BigDecimal cartItemTotalPrice = null;//获取sessionHttpSession session = req.getSession();//获取存放物品信息的mapHashMap<Integer, CartItem> cart = (HashMap<Integer, CartItem>) session.getAttribute("Cart");if (cart == null || cart.isEmpty()) { //如果map是空的或者没有数据HashMap<Integer, CartItem> CartItemHashMap = new HashMap<>();//只有一件，总价格就是一件的价格cartItemTotalPrice = cartItemPrice;//封装到bean中CartItem cartItem = new CartItem(cartItemId, cartItemName, cartItemPrice, cartItemCount, cartItemTotalPrice);CartItemHashMap.put(cartItemId, cartItem);session.setAttribute("Cart", CartItemHashMap);session.setAttribute("totalNum", cartItemCount);session.setAttribute("allPrice", cartItemPrice);} else {//只要map里包含了同样的id则数量加一if (cart.containsKey(cartItemId)) {cartItemCount = cart.get(cartItemId).getCount() + 1;}//计算总价格cartItemTotalPrice = cartItemPrice.multiply(new BigDecimal(cartItemCount));//封装到bean中CartItem cartItem = new CartItem(cartItemId, cartItemName, cartItemPrice, cartItemCount, cartItemTotalPrice);cart.put(cartItemId, cartItem);//重新计算总价和商品数量，并放到session中CartItem.calTotalNumAndPrice(cart, session);}//将totalNum以json的形式返回Map<String, Object> map = new HashMap<>();map.put("cartTotalCount", (Integer) session.getAttribute("totalNum"));Gson gson = new Gson();String json = gson.toJson(map);resp.getWriter().write(json);}

2.修改index.jsp

3.解决问题—未登录直接添加购物车，ajax请求无法重定向到登录页面

1.解决方案

2.编写WebUtils判断是否是ajax请求

package com.sxs.furns.utils;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** @author 孙显圣* @version 1.0*/
public class WebUtils {//判断是否是ajax请求public static boolean isAjaxRequest(HttpServletRequest request, HttpServletResponse response) {return "XMLHttpRequest".equals(request.getHeader("X-Requested-With"));}
}

3.修改MemberAuthorization（过滤器）

package com.sxs.furns.filter;import com.google.gson.Gson;
import com.sxs.furns.utils.WebUtils;import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;/*** 普通权限认证* @author 孙显圣* @version 1.0*/
public class MemberAuthorization implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpSession session = ((HttpServletRequest) servletRequest).getSession();//进行普通权限认证Object username = session.getAttribute("username");Object admin = session.getAttribute("admin");if (username != null || admin != null) {//放行filterChain.doFilter(servletRequest, servletResponse);} else {//如果不是ajax请求就正常执行if (!WebUtils.isAjaxRequest((HttpServletRequest) servletRequest, (HttpServletResponse) servletResponse)){//重定向到用户登录界面((HttpServletResponse) servletResponse).sendRedirect("/jiaju_mail/views/member/login.jsp");}//如果是ajax请求，就返回一个url,以json形式Map<String, Object> map = new HashMap<>();map.put("url", "views/member/login.jsp");String json = new Gson().toJson(map);servletResponse.getWriter().write(json);}}@Overridepublic void destroy() {}
}

4.修改index.jsp

4.结果展示

1.未登录添加购物车，跳转到登录页面

2.登录之后添加购物车，ajax局部刷新

4.上传更新家居图片

1.需求分析

2.程序框架图

3.修改FurnServlet

    /*** 读取表单信息，进行修改** @param req* @param resp*/public void updateFurn(HttpServletRequest req, HttpServletResponse resp) throws IOException {//判断是否为文件类型的表单if (ServletFileUpload.isMultipartContent(req)) {//构建一个解析上传文件数据的工具对象DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();//将这个对象给servletFileUpload，创建一个实例ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);//解决文件乱码servletFileUpload.setHeaderEncoding("utf-8");try {//获取文件项列表List<FileItem> list = servletFileUpload.parseRequest(req);Furn furn = new Furn();//ArrayList存储所有的普通表单字段ArrayList<String> furnItems = new ArrayList<>();//遍历文件项，判断是一个文件还是普通表单字段，做出不同的处理for (FileItem fileItem : list) {//普通表单字段处理if (fileItem.isFormField()) {//获取普通表单字段，添加到ArrayList中String furnItem = fileItem.getString("utf-8");furnItems.add(furnItem);} else {//文件项处理//获取文件名，对名字进行处理，防止重名String name = UUID.randomUUID() + "_" + System.currentTimeMillis() + fileItem.getName();//创建将来要存放的目录，这里不加/也会被认为是上下文路径，跟地址栏无关，但是建议加上String filePath = "/assets/images/product-image/";//获取真实路径String realPath = super.getServletContext().getRealPath(filePath);//判断是否有这个目录，如果没有再创建File file = new File(realPath);if (!file.exists()) {file.mkdirs();}//将文件拷贝到刚才创建的目录下String fileFullPath = realPath + name;fileItem.write(new File(fileFullPath));//设置furn的imgPathString imgPath = "assets/images/product-image/" + name;furn.setImgPath(imgPath);if (fileItem.getName() == null || "".equals(fileItem.getName())) {//如果没有修改图片，则路径不变//从数据库中查询该id对应的imgPath//就这里查出来的结果跟数据库的imgPath结果不一致Furn rawFurn = furnService.queryFurnById(DataUtils.parseInt(furnItems.get(0), 0));imgPath = rawFurn.getImgPath();}furn.setImgPath(imgPath);}}//将普通订单项结果放到furn中furn.setId(DataUtils.parseInt(furnItems.get(0), 0));furn.setName(furnItems.get(1));furn.setMaker(furnItems.get(2));furn.setPrice(new BigDecimal(furnItems.get(3)));furn.setSales(DataUtils.parseInt(furnItems.get(4), 0));furn.setStock(DataUtils.parseInt(furnItems.get(5), 0));//获取pageNoString pageNo = req.getParameter("pageNo");//执行更新操作if (furnService.updateFurn(furn)) {//更新成功则重定向到展示页面resp.sendRedirect(super.getServletContext().getContextPath() + "/manage/furnServlet?action=page&pageNo=" + pageNo);} else {System.out.println("更新失败");}} catch (FileUploadException e) {throw new RuntimeException(e);} catch (Exception e) {throw new RuntimeException(e);}}}

4.修改furn_update.jsp

1.样式

    <style type="text/css">/* 整体表格样式 */.table-content table {width: 100%;border-collapse: collapse;margin: 20px 0;font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);}.table-content th,.table-content td {text-align: left;padding: 12px;border-bottom: 1px solid #ddd;}.table-content th {background: linear-gradient(120deg, #006c70, #00b2a9);color: #ffffff;text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);}.table-content tr:hover {background-color: #f5f5f5;}/* 上传文件部分的样式 */.table-content .product-thumbnail {display: flex;flex-direction: column;align-items: center;position: relative;margin: 20px auto;}.table-content input[type="file"] {width: 200px;height: 200px;opacity: 0;position: absolute;cursor: pointer;z-index: 2; /* 确保文件输入位于图片上方 */}.table-content img {border-radius: 50%;width: 150px;height: 150px;object-fit: cover; /* 确保图片不会失真 */border: 2px solid #009688; /* 图片边框颜色与表头一致 */box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); /* 轻微的阴影效果 */}/* 自定义文件上传提示样式 */.product-thumbnail::before {content: '点击或拖拽上传图片';position: absolute;width: 200px;height: 200px;background-color: rgba(0, 150, 136, 0.9);color: white;display: flex;justify-content: center;align-items: center;text-align: center;border-radius: 50%;font-size: 16px;transition: all 0.3s ease;opacity: 0;z-index: 1;font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;font-weight: 600;box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);}.product-thumbnail:hover::before {opacity: 1;}/* 调整提交按钮样式 */.table-content input[type="submit"] {background: linear-gradient(120deg, #31B0D5, #2196F3);color: white;padding: 10px 20px;border: none;border-radius: 5px;transition: background-color 0.3s ease;cursor: pointer;font-size: 16px;text-transform: uppercase;letter-spacing: 1px;box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);}.table-content input[type="submit"]:hover {background-color: #2196F3;}/* 响应式设计 */@media (max-width: 768px) {.product-thumbnail {width: 150px;height: 150px;}.product-thumbnail input[type="file"] {width: 150px;height: 150px;}.product-thumbnail img {width: 150px;height: 150px;}.product-thumbnail::before {width: 150px;height: 150px;font-size: 14px;}.table-content input[type="submit"] {padding: 8px 16px;}}</style><script type="text/javascript">function prev(event) {//获取展示图片的区域var img = document.getElementById("prevView");//获取文件对象var file = event.files[0];//获取文件阅读器： Js的一个类，直接使用即可var reader = new FileReader();reader.readAsDataURL(file);reader.onload = function () {//给img的src设置图片urlimg.setAttribute("src", this.result);}}</script>

2.修改form的enctype

3.修改td

5.解决bug，写sql的时候注意映射，映射，映射!!!（卡了2个小时才发现，醉了）

6.结果展示

1.点击上传图片

2.查看效果

3.点击修改家居，回到原页面

5.上传添加家居图片

1.修改FurnServlet

    /*** 添加家居并重新获取家居信息，重定向到furn_manage.jsp** @param req* @param resp*/public void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException, InvocationTargetException, IllegalAccessException {//判断是否为文件类型的表单if (ServletFileUpload.isMultipartContent(req)) {//构建一个解析上传文件数据的工具对象DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();//将这个对象给servletFileUpload，创建一个实例ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);//解决文件乱码servletFileUpload.setHeaderEncoding("utf-8");try {//获取文件项列表List<FileItem> list = servletFileUpload.parseRequest(req);Furn furn = new Furn();//ArrayList存储所有的普通表单字段ArrayList<String> furnItems = new ArrayList<>();//遍历文件项，判断是一个文件还是普通表单字段，做出不同的处理for (FileItem fileItem : list) {//普通表单字段处理if (fileItem.isFormField()) {//获取普通表单字段，添加到ArrayList中String furnItem = fileItem.getString("utf-8");furnItems.add(furnItem);} else {//文件项处理//获取文件名，对名字进行处理，防止重名String name = UUID.randomUUID() + "_" + System.currentTimeMillis() + fileItem.getName();//创建将来要存放的目录，这里不加/也会被认为是上下文路径，跟地址栏无关，但是建议加上String filePath = "/assets/images/product-image/";//获取真实路径String realPath = super.getServletContext().getRealPath(filePath);//判断是否有这个目录，如果没有再创建File file = new File(realPath);if (!file.exists()) {file.mkdirs();}//将文件拷贝到刚才创建的目录下String fileFullPath = realPath + name;fileItem.write(new File(fileFullPath));//设置furn的imgPathString imgPath = "assets/images/product-image/" + name;furn.setImgPath(imgPath);if (fileItem.getName() == null || "".equals(fileItem.getName())) {//如果没有修改图片，则路径设置默认的imgPath = "assets/images/product-image/default.jpg";}furn.setImgPath(imgPath);}}//将普通订单项结果放到furn中furn.setName(furnItems.get(0));furn.setMaker(furnItems.get(1));furn.setPrice(new BigDecimal(furnItems.get(2)));furn.setSales(DataUtils.parseInt(furnItems.get(3), 0));furn.setStock(DataUtils.parseInt(furnItems.get(4), 0));//获取pageNoString pageNo = req.getParameter("pageNo");//插入到数据库if (furnService.add(furn)) {//插入成功则重定向到家居显示的servletresp.sendRedirect(super.getServletContext().getContextPath() + "/manage/furnServlet?action=page&pageNo=" + pageNo);} else {System.out.println("插入失败");}} catch (FileUploadException e) {throw new RuntimeException(e);} catch (Exception e) {throw new RuntimeException(e);}}}

2.修改furn_add.jsp

1.前端样式与前面一样

2.修改form的enctype

3.修改td

3.结果展示

1.准备添加家居

2.效果展示

3.添加之后