书城武林秘籍第二部~看完第一层懂的进！
设计页面
由于本人的欣赏水平不高，更重要是技术有限，对web的理解浅薄没办法做花里胡哨（其实我挺喜欢花里胡哨，只是最近事情太多吧，后边我会时间来修改这些）。这里就展示主界面jsp
**<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>骚磊专业书城书城首页</title>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
<Script type="text/javascript">
$(function () {
// 给加入购物车按钮绑定单击事件
$("button.addToCart").click(function () {
/**
* 在事件响应的function函数 中，有一个this对象，这个this对象，是当前正在响应事件的dom对象
* @type {jQuery}
*/
var bookId = $(this).attr("bookId");
// location.href = "http://localhost:8080/book/cartServlet?action=addItem&id=" + bookId;
// 发ajax请求，添加商品到购物车
$.getJSON("http://localhost:8080/book/cartServlet","action=ajaxAddItem&id=" + bookId,function (data) {
$("#cartTotalCount").text("您的购物车中有 " + data.totalCount + " 件商品");
$("#cartLastName").text(data.lastName);
})
});
});
</Script>
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="static/img/logo1.gif" >
<span class="wel_word"> 网上书城</span>
<div>
<%--如果用户还没有登录，显示 【登录 和注册的菜单】 --%>
<c:if test="${empty sessionScope.user}">
<a href="pages/user/login.jsp">登录</a> |
<a href="pages/user/regist.jsp">注册</a>
</c:if>
<%--如果已经登录，则显示 登录 成功之后的用户信息。--%>
<c:if test="${not empty sessionScope.user}">
<span>欢迎<span class="um_span">${sessionScope.user.username}</span>光临尚硅谷书城</span>
<a href="pages/order/order.jsp">我的订单</a>
<a href="userServlet?action=logout">注销</a>
</c:if>
<a href="pages/cart/cart.jsp">购物车</a>
<a href="pages/manager/manager.jsp">后台管理</a>
</div>
</div>
<div id="main">
<div id="book">
<div class="book_cond">
<form action="client/bookServlet" method="get">
<input type="hidden" name="action" value="pageByPrice">
价格：<input id="min" type="text" name="min" value="${param.min}"> 元 -
<input id="max" type="text" name="max" value="${param.max}"> 元
<input type="submit" value="查询" />
</form>
</div>
<div style="text-align: center">
<c:if test="${empty sessionScope.cart.items}">
<%--购物车为空的输出--%>
<span id="cartTotalCount"> </span>
<div>
<span style="color: red" id="cartLastName">当前购物车为空</span>
</div>
</c:if>
<c:if test="${not empty sessionScope.cart.items}">
<%--购物车非空的输出--%>
<span id="cartTotalCount">您的购物车中有 ${sessionScope.cart.totalCount} 件商品</span>
<div>
您刚刚将<span style="color: red" id="cartLastName">${sessionScope.lastName}</span>加入到了购物车中
</div>
</c:if>
</div>
<c:forEach items="${requestScope.page.items}" var="book">
<div class="b_list">
<div class="img_div">
<img class="book_img" alt="" src="${book.imgPath}" />
</div>
<div class="book_info">
<div class="book_name">
<span class="sp1">书名:</span>
<span class="sp2">${book.name}</span>
</div>
<div class="book_author">
<span class="sp1">作者:</span>
<span class="sp2">${book.author}</span>
</div>
<div class="book_price">
<span class="sp1">价格:</span>
<span class="sp2">￥${book.price}</span>
</div>
<div class="book_sales">
<span class="sp1">销量:</span>
<span class="sp2">${book.sales}</span>
</div>
<div class="book_amount">
<span class="sp1">库存:</span>
<span class="sp2">${book.stock}</span>
</div>
<div class="book_add">
<button bookId="${book.id}" class="addToCart">加入购物车</button>
</div>
</div>
</div>
</c:forEach>
</div>
<%--静态包含分页条--%>
<%@include file="/pages/common/page_nav.jsp"%>
</div>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
</body>
</html>**
完成登录注册功能
一般我们的登录界面都是login.jsp,再有了界面之后我们编写servlet，这里笔者定义为UserServlet(这里封装的有一额BaseServlet，都是继承，路径不在分析，建议csdn或者百度搜索怎么配置，不在详细去写)
BaseServlet
public abstract class BaseServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 解决post请求中文乱码问题
// 一定要在获取请求参数之前调用才有效
req.setCharacterEncoding("UTF-8");
// 解决响应的中文乱码
resp.setContentType("text/html; charset=UTF-8");
String action = req.getParameter("action");
try {
// 获取action业务鉴别字符串，获取相应的业务 方法反射对象
Method method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
// System.out.println(method);
// 调用目标业务 方法
method.invoke(this, req, resp);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);// 把异常抛给Filter过滤器
}
}
}
UserSerlvet(这里我把所有的功能都贴出来不在单拉出来)
public class UserServlet extends BaseServlet {
private UserService userService = new UserServiceImpl();
protected void ajaxExistsUsername(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 获取请求的参数username
String username = req.getParameter("username");
// 调用userService.existsUsername();
boolean existsUsername = userService.existsUsername(username);
// 把返回的结果封装成为map对象
Map<String,Object> resultMap = new HashMap<>();
resultMap.put("existsUsername",existsUsername);
Gson gson = new Gson();
String json = gson.toJson(resultMap);
resp.getWriter().write(json);
}
/**
* 注销
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void logout(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、销毁Session中用户登录的信息（或者销毁Session）
req.getSession().invalidate();
// 2、重定向到首页（或登录页面）。
resp.sendRedirect(req.getContextPath());
}
/**
* 处理登录的功能
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数
String username = req.getParameter("username");
String password = req.getParameter("password");
// 调用 userService.login()登录处理业务
User loginUser = userService.login(new User(null, username, password, null));
// 如果等于null,说明登录 失败!
if (loginUser == null) {
// 把错误信息，和回显的表单项信息，保存到Request域中
req.setAttribute("msg", "用户或密码错误！");
req.setAttribute("username", username);
// 跳回登录页面
req.getRequestDispatcher("/pages/user/login.jsp").forward(req, resp);
} else {
// 登录 成功
// 保存用户登录的信息到Session域中
req.getSession().setAttribute("user", loginUser);
//跳到成功页面login_success.html
req.getRequestDispatcher("/pages/user/login_success.jsp").forward(req, resp);
}
}
/**
* 处理注册的功能
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 获取Session中的验证码
String token = (String) req.getSession().getAttribute(KAPTCHA_SESSION_KEY);
// 删除 Session中的验证码
req.getSession().removeAttribute(KAPTCHA_SESSION_KEY);
// 1、获取请求的参数
String username = req.getParameter("username");
String password = req.getParameter("password");
String email = req.getParameter("email");
String code = req.getParameter("code");
User user = WebUtils.copyParamToBean(req.getParameterMap(), new User());
// 2、检查 验证码是否正确 === 写死,要求验证码为:abcde
if (token!=null && token.equalsIgnoreCase(code)) {
// 3、检查 用户名是否可用
if (userService.existsUsername(username)) {
System.out.println("用户名[" + username + "]已存在!");
// 把回显信息，保存到Request域中
req.setAttribute("msg", "用户名已存在！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
// 跳回注册页面
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
} else {
// 可用
// 调用Sservice保存到数据库
userService.registUser(new User(null, username, password, email));
//
// 跳到注册成功页面 regist_success.jsp
req.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req, resp);
}
} else {
// 把回显信息，保存到Request域中
req.setAttribute("msg", "验证码错误！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
System.out.println("验证码[" + code + "]错误");
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
}
}
}
RegistServlet
public class RegistServlet extends HttpServlet {
private UserService userService = new UserServiceImpl();
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数
String username = req.getParameter("username");
String password = req.getParameter("password");
String email = req.getParameter("email");
String code = req.getParameter("code");
// 2、检查 验证码是否正确 === 写死,要求验证码为:abcde
if ("abcde".equalsIgnoreCase(code)) {
// 3、检查 用户名是否可用
if (userService.existsUsername(username)) {
System.out.println("用户名[" + username + "]已存在!");
// 把回显信息，保存到Request域中
req.setAttribute("msg", "用户名已存在！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
// 跳回注册页面
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
} else {
// 可用
// 调用Sservice保存到数据库
userService.registUser(new User(null, username, password, email));
//
// 跳到注册成功页面 regist_success.jsp
req.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req, resp);
}
} else {
// 把回显信息，保存到Request域中
req.setAttribute("msg", "验证码错误！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
System.out.println("验证码[" + code + "]错误");
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
}
}
}
我想了想还是给大家录个视频算了，地址在这里，大家可以跟着一起敲一遍~书城视频