JAVAEE中用Session简单实现购物车功能示例代码

Session简单实现购物车功能

目前创新互联已为近1000家的企业提供了网站建设、域名、虚拟主机网站托管运营、企业网站设计、梨树网站维护等服务,公司将坚持客户导向、应用为本的策略,正道将秉承"和谐、参与、激情"的文化,与客户和合作伙伴齐心协力一起成长,共同发展。

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("

书单



"); out.print("人类简史加入购物车
"); out.print("未来简史加入购物车
"); out.print("世界简史加入购物车
"); out.print("时间简史加入购物车
"); out.print("查看购物车
"); } 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 list = (List) 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
" + "继续购物
" + "查看购物车
"); } 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 list = (List)request.getSession().getAttribute("cart");
    if(list!=null){   
      out.print("你的购物清单:
"); for (String string : list) { out.println(DBUtils.findById(string)+"
"); } out.println("
继续购物
"); }else{ out.println("你还没有将商品添加到购物车
" + "返回商品列表
"); } } 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 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);
  }

}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。


新闻标题:JAVAEE中用Session简单实现购物车功能示例代码
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