UserServlet.java

package com.aff.bookstore.servlet;

import java.io.IOException;

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.aff.bookstore.domain.User;

import com.aff.bookstore.service.UserService;

@WebServlet("/userServlet")

public class UserServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private UserService userService  =  new UserService();

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // 获取username 请求参数的值

        String username =  request.getParameter("username");

        // 调用UserService 的 getUser(username) 获取 User对象， 要求 trade 是被装配好的 ， 而且

        // 每一个trade 对象的items

                User user = userService.getUserWithTrades(username);

                // 把User 对象方法放reuest 中

                if (user == null) {

                    response.sendRedirect(request.getServletPath()+"errror-1.jsp");

                    return;

                }

                request.setAttribute("user", user);

                // 转发页面到/WEB-INF/pages/trades.jsp

                request.getRequestDispatcher("/WEB-INF/pages/trades.jsp").forward(request, response);;

    }

}

users.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ include file="/commons/common.jsp" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

            <center>

            <br><br>

            <form action="userServlet" method="post">

                    username: <input type="text" name="username"/>

                                     <input type="submit" value="Submit">

            </form>

            </center>

</body>

</html>

trades.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ include file="/commons/common.jsp" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

        <center>

        <br><br>

        <h3>User: ${user.username}</h3>

        <br><br>

        <table>

        <c:forEach  items="${user.trades }" var="trade">

        <tr>

        <td>

            <table border="1" cellpadding="10" cellspacing="0">

                    <tr>

                            <td colspan="3">TradeTime:${trade.tradeTime }</td>

                    </tr>

                    <c:forEach items="${trade.items }" var="item">

                    <tr>

                            <td>${item.book.title }</td>

                            <td>${item.book.price }</td>

                            <td>${item.quantity }</td>

                    </tr>

                    </c:forEach>

        </table>

        <br>

        </td>

        </tr>

        </c:forEach>

        </table>

        </center>

</body>

</html>

TradeDAOImpl.java
package com.aff.bookstore.dao.impl;

import java.util.LinkedHashSet;

import java.util.Set;

import com.aff.bookstore.dao.TradeDAO;

import com.aff.bookstore.domain.Trade;

public class TradeDAOImpl extends BaseDAO<Trade> implements TradeDAO {

    @Override

    public void insert(Trade trade) {

        String sql = "insert into trade(userid,tradetime)  values(?,?)";

        long tradeId = insert(sql, trade.getUserId(),trade.getTradeTime());

        trade.setTradeId((int)tradeId);

    }

    @Override

    public Set<Trade> getTradesWithUserId(Integer userId) {

        String sql = "select  tradeId,userId, tradeTime from trade where userId = ? order by  tradeTime desc";

        return new LinkedHashSet<>(queryForList(sql, userId));

    }



}

 效果如下

解决相对路径问题：

common.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<base href="${pageContext.request.scheme }://${pageContext.request.serverName }:${pageContext.request.serverPort }${pageContext.request.contextPath}/">

在需要的jsp中添加<%@ include file="/commons/common.jsp" %>

如下：empty.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ include file="/commons/common.jsp" %>  

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <h4>您的购物车为空</h4>

    <a href="index.jsp">继续购物</a>

</body>

</html>

整个目录

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