JAVAEE中用Session简单实现购物车功能示例代码

2024-07-13 10:04:56

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Session简单实现购物车功能

这个小程序主要就3个页面，一个商品列表页面(HomeServlet)，一个是提示加入购物车页面(AddCartTipServlet)，一个是显示购物车清单页面(ShowCartServlet)。

HomeServlet页面：

@WebServlet({ "/HomeServlet", "/home" })public class HomeServlet extends HttpServlet {  private static final long serialVersionUID = 1L;  public HomeServlet() {    super();  }  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    request.setCharacterEncoding("utf-8");    response.setContentType("text/html;charset=utf-8");    PrintWriter out = response.getWriter();    out.print("<h2>书单</h2><hr/><br/>");    out.print("人类简史<a href='"+request.getContextPath()+"/addCartTip?id=1'>加入购物车</a><br/>");    out.print("未来简史<a href='"+request.getContextPath()+"/addCartTip?id=2'>加入购物车</a><br/>");    out.print("世界简史<a href='"+request.getContextPath()+"/addCartTip?id=3'>加入购物车</a><br/>");    out.print("时间简史<a href='"+request.getContextPath()+"/addCartTip?id=4'>加入购物车</a><br/>");    out.print("<a href='"+request.getContextPath()+"/show/cart'>查看购物车</a><br/>");  }  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    doGet(request, response);  }}

AddCartTipServlet页面：

@WebServlet({ "/AddCartTipsServlet", "/addCartTip" })public class AddCartTipsServlet extends HttpServlet {  private static final long serialVersionUID = 1L;  public AddCartTipsServlet() {    super();  }  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    request.setCharacterEncoding("utf-8");    response.setContentType("text/html;charset=utf-8");    HttpSession session = request.getSession();    List<String> list = (List<String>) session.getAttribute("cart");    if(list==null){      list=new ArrayList<>();    }    String id = request.getParameter("id");    list.add(id);    session.setAttribute("cart", list);    System.out.println(list.toString());    response.getWriter().println("已加入购物车<br/>"        + "<a href='"+request.getContextPath()+"/home'>继续购物</a><br/>"        + "<a href='"+request.getContextPath()+"/show/cart'>查看购物车</a><br/>");  }  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    doGet(request, response);  }}

ShowCartSevlet页面

@WebServlet({ "/ShowCartServlet", "/show/cart" })public class ShowCartServlet extends HttpServlet {  private static final long serialVersionUID = 1L;  public ShowCartServlet() {    super();  }  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    request.setCharacterEncoding("utf-8");    response.setContentType("text/html;charset=utf-8");    PrintWriter out = response.getWriter();    List<String> list = (List<String>)request.getSession().getAttribute("cart");    if(list!=null){         out.print("你的购物清单：<br/>");      for (String string : list) {        out.println(DBUtils.findById(string)+"<br/>");      }      out.println("<br/><a href='"+request.getContextPath()+"/home'>继续购物</a><br/>");    }else{      out.println("你还没有将商品添加到购物车<br/>"          + "<a href='"+request.getContextPath()+"/home'>返回商品列表</a><br/>");    }  }  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    doGet(request, response);  }}

DBUtils：存储着商品信息

public class DBUtils {  private static Map<String,String> map = new HashMap<>();  static{    map.put("1", "人类简史");    map.put("2", "未来简史");    map.put("3", "世界简史");    map.put("4", "时间简史");  }  public static String findById(String id){    return map.get(id);  }}

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