{"id":1277,"date":"2026-01-09T14:22:38","date_gmt":"2026-01-09T06:22:38","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=1277"},"modified":"2026-01-09T14:22:38","modified_gmt":"2026-01-09T06:22:38","slug":"javaweb%e7%a8%8b%e5%ba%8f%e8%ae%be%e8%ae%a1%e4%b9%8bjsp%e5%ae%9e%e7%8e%b0%e8%b4%ad%e7%89%a9%e8%bd%a6%e5%8a%9f%e8%83%bd%e5%85%a8%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2026\/01\/09\/javaweb%e7%a8%8b%e5%ba%8f%e8%ae%be%e8%ae%a1%e4%b9%8bjsp%e5%ae%9e%e7%8e%b0%e8%b4%ad%e7%89%a9%e8%bd%a6%e5%8a%9f%e8%83%bd%e5%85%a8%e8%bf%87%e7%a8%8b\/","title":{"rendered":"JavaWeb\u7a0b\u5e8f\u8bbe\u8ba1\u4e4bJSP\u5b9e\u73b0\u8d2d\u7269\u8f66\u529f\u80fd\u5168\u8fc7\u7a0b"},"content":{"rendered":"\n

\u4e0b\u9762\u6211\u7ed9\u4f60\u4e00\u4efd**\u300aJavaWeb \u7a0b\u5e8f\u8bbe\u8ba1\uff1a\u4f7f\u7528 JSP \u5b9e\u73b0\u8d2d\u7269\u8f66\u529f\u80fd\u7684\u5b8c\u6574\u5168\u8fc7\u7a0b\u8bb2\u89e3\u300b\uff0c\u4ece<\/strong>\u539f\u7406 \u2192 \u8bbe\u8ba1 \u2192 \u6838\u5fc3\u4ee3\u7801 \u2192 \u8fd0\u884c\u6d41\u7a0b**\u4e00\u6b65\u4e00\u6b65\u6765\uff0c\u9002\u5408\u8bfe\u7a0b\u8bbe\u8ba1 \/ \u5b9e\u8bad \/ \u8003\u8bd5 \/ \u81ea\u5b66\u4f7f\u7528\u3002<\/p>\n\n\n\n

\n\n\n\n

\u4e00\u3001\u8d2d\u7269\u8f66\u529f\u80fd\u6574\u4f53\u601d\u8def<\/h1>\n\n\n\n

\u5728 JavaWeb\uff08JSP + Servlet\uff09\u4e2d\uff0c\u5b9e\u73b0\u8d2d\u7269\u8f66\u901a\u5e38\u9075\u5faa\u4ee5\u4e0b\u601d\u8def\uff1a<\/p>\n\n\n\n

\u6838\u5fc3\u601d\u60f3<\/h3>\n\n\n\n
\n

\u8d2d\u7269\u8f66\u6570\u636e\u5b58\u653e\u5728 Session \u4e2d<\/strong><\/p>\n<\/blockquote>\n\n\n\n

\u539f\u56e0\uff1a<\/p>\n\n\n\n

    \n
  • Session \u5c5e\u4e8e\u67d0\u4e2a\u7528\u6237<\/li>\n\n\n\n
  • \u6d4f\u89c8\u5668\u5173\u95ed\u524d\u90fd\u6709\u6548<\/li>\n\n\n\n
  • \u4e0d\u4f9d\u8d56\u6570\u636e\u5e93\uff0c\u7b80\u5355\u6613\u5b9e\u73b0<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n

    \u8d2d\u7269\u8f66\u5305\u542b\u7684\u57fa\u672c\u529f\u80fd<\/h2>\n\n\n\n
      \n
    1. \u5546\u54c1\u5217\u8868\u5c55\u793a<\/li>\n\n\n\n
    2. \u6dfb\u52a0\u5546\u54c1\u5230\u8d2d\u7269\u8f66<\/li>\n\n\n\n
    3. \u67e5\u770b\u8d2d\u7269\u8f66<\/li>\n\n\n\n
    4. \u4fee\u6539\u5546\u54c1\u6570\u91cf<\/li>\n\n\n\n
    5. \u5220\u9664\u5546\u54c1<\/li>\n\n\n\n
    6. \u8ba1\u7b97\u603b\u4ef7<\/li>\n<\/ol>\n\n\n\n
      \n\n\n\n

      \u4e8c\u3001\u9879\u76ee\u7ed3\u6784\u8bbe\u8ba1\uff08\u7ecf\u5178 JavaWeb\uff09<\/h1>\n\n\n
      \nShoppingCart\/\n\u2502\n\u251c\u2500\u2500 src\/\n\u2502   \u251c\u2500\u2500 entity\/\n\u2502   \u2502   \u2514\u2500\u2500 Product.java\n\u2502   \u251c\u2500\u2500 servlet\/\n\u2502   \u2502   \u2514\u2500\u2500 CartServlet.java\n\u2502\n\u251c\u2500\u2500 WebContent\/\n\u2502   \u251c\u2500\u2500 product.jsp\n\u2502   \u251c\u2500\u2500 cart.jsp\n\u2502   \u2514\u2500\u2500 index.jsp\n\u2502\n\u2514\u2500\u2500 web.xml\n\n<\/pre><\/div>\n\n\n
      \n\n\n\n
      \u4e09\u3001\u5b9e\u4f53\u7c7b\u8bbe\u8ba1\uff08Product\uff09<\/h1>\n\n\n\n
      \u8d2d\u7269\u8f66\u4e2d\u5b58\u50a8\u7684\u662f \u5546\u54c1\u5bf9\u8c61 + \u6570\u91cf<\/strong><\/p>\n\n\n
      \npackage entity;\n\npublic class Product {\n    private int id;\n    private String name;\n    private double price;\n    private int quantity;\n\n    public Product(int id, String name, double price, int quantity) {\n        this.id = id;\n        this.name = name;\n        this.price = price;\n        this.quantity = quantity;\n    }\n\n    \/\/ getter \/ setter \u7701\u7565\n}\n\n<\/pre><\/div>\n\n\n
      \n\n\n\n
      \u56db\u3001\u5546\u54c1\u5c55\u793a\u9875\u9762\uff08product.jsp\uff09<\/h1>\n\n\n\n
      \u7528\u4e8e\u663e\u793a\u5546\u54c1\u5217\u8868\u5e76\u63d0\u4f9b\u300c\u52a0\u5165\u8d2d\u7269\u8f66\u300d\u6309\u94ae\u3002<\/p>\n\n\n
      \n&lt;%@ page contentType="text\/html;charset=UTF-8" %>\n&lt;html>\n&lt;head>\n    &lt;title>\u5546\u54c1\u5217\u8868&lt;\/title>\n&lt;\/head>\n&lt;body>\n&lt;h2>\u5546\u54c1\u5217\u8868&lt;\/h2>\n\n&lt;table border="1">\n    &lt;tr>\n        &lt;th>\u7f16\u53f7&lt;\/th>\n        &lt;th>\u540d\u79f0&lt;\/th>\n        &lt;th>\u4ef7\u683c&lt;\/th>\n        &lt;th>\u64cd\u4f5c&lt;\/th>\n    &lt;\/tr>\n\n    &lt;tr>\n        &lt;td>1&lt;\/td>\n        &lt;td>Java \u7f16\u7a0b\u601d\u60f3&lt;\/td>\n        &lt;td>88&lt;\/td>\n        &lt;td>\n            &lt;a href="CartServlet?action=add&amp;id=1&amp;name=Java\u7f16\u7a0b\u601d\u60f3&amp;price=88">\n                \u52a0\u5165\u8d2d\u7269\u8f66\n            &lt;\/a>\n        &lt;\/td>\n    &lt;\/tr>\n\n    &lt;tr>\n        &lt;td>2&lt;\/td>\n        &lt;td>Spring \u5b9e\u6218&lt;\/td>\n        &lt;td>99&lt;\/td>\n        &lt;td>\n            &lt;a href="CartServlet?action=add&amp;id=2&amp;name=Spring\u5b9e\u6218&amp;price=99">\n                \u52a0\u5165\u8d2d\u7269\u8f66\n            &lt;\/a>\n        &lt;\/td>\n    &lt;\/tr>\n&lt;\/table>\n\n&lt;a href="cart.jsp">\u67e5\u770b\u8d2d\u7269\u8f66&lt;\/a>\n&lt;\/body>\n&lt;\/html>\n\n<\/pre><\/div>\n\n\n
      \n\n\n\n
      \u4e94\u3001\u6838\u5fc3\u63a7\u5236\u5668\uff08CartServlet\uff09<\/h1>\n\n\n\n
      Servlet \u662f\u8d2d\u7269\u8f66\u7684\u201c\u5927\u8111\u201d<\/strong><\/p>\n\n\n\n
      1\ufe0f\u20e3 \u5904\u7406\u903b\u8f91\u8bf4\u660e<\/h2>\n\n\n\n
      action<\/th>\u529f\u80fd<\/th><\/tr><\/thead>
      add<\/td>\u6dfb\u52a0\u5546\u54c1<\/td><\/tr>
      remove<\/td>\u5220\u9664\u5546\u54c1<\/td><\/tr>
      clear<\/td>\u6e05\u7a7a\u8d2d\u7269\u8f66<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \n\n\n\n
      2\ufe0f\u20e3 CartServlet \u4ee3\u7801<\/h2>\n\n\n
      \n@WebServlet("\/CartServlet")\npublic class CartServlet extends HttpServlet {\n\n    protected void doGet(HttpServletRequest request, HttpServletResponse response)\n            throws ServletException, IOException {\n\n        HttpSession session = request.getSession();\n        Map&lt;Integer, Product> cart =\n                (Map&lt;Integer, Product>) session.getAttribute("cart");\n\n        if (cart == null) {\n            cart = new HashMap&lt;>();\n        }\n\n        String action = request.getParameter("action");\n\n        if ("add".equals(action)) {\n            int id = Integer.parseInt(request.getParameter("id"));\n            String name = request.getParameter("name");\n            double price = Double.parseDouble(request.getParameter("price"));\n\n            if (cart.containsKey(id)) {\n                Product p = cart.get(id);\n                p.setQuantity(p.getQuantity() + 1);\n            } else {\n                cart.put(id, new Product(id, name, price, 1));\n            }\n        }\n\n        if ("remove".equals(action)) {\n            int id = Integer.parseInt(request.getParameter("id"));\n            cart.remove(id);\n        }\n\n        if ("clear".equals(action)) {\n            cart.clear();\n        }\n\n        session.setAttribute("cart", cart);\n        response.sendRedirect("cart.jsp");\n    }\n}\n\n<\/pre><\/div>\n\n\n
      \n\n\n\n
      \u516d\u3001\u8d2d\u7269\u8f66\u9875\u9762\uff08cart.jsp\uff09<\/h1>\n\n\n\n
      \u5c55\u793a\u8d2d\u7269\u8f66\u5185\u5bb9\u3001\u603b\u4ef7\u3001\u5220\u9664\u64cd\u4f5c\u3002<\/p>\n\n\n
      \n&lt;%@ page contentType="text\/html;charset=UTF-8" %>\n&lt;%@ page import="java.util.*, entity.Product" %>\n\n&lt;html>\n&lt;head>\n    &lt;title>\u8d2d\u7269\u8f66&lt;\/title>\n&lt;\/head>\n&lt;body>\n&lt;h2>\u8d2d\u7269\u8f66&lt;\/h2>\n\n&lt;table border="1">\n    &lt;tr>\n        &lt;th>\u5546\u54c1\u540d&lt;\/th>\n        &lt;th>\u5355\u4ef7&lt;\/th>\n        &lt;th>\u6570\u91cf&lt;\/th>\n        &lt;th>\u5c0f\u8ba1&lt;\/th>\n        &lt;th>\u64cd\u4f5c&lt;\/th>\n    &lt;\/tr>\n\n&lt;%\n    Map&lt;Integer, Product> cart =\n        (Map&lt;Integer, Product>) session.getAttribute("cart");\n\n    double total = 0;\n\n    if (cart != null) {\n        for (Product p : cart.values()) {\n            double subtotal = p.getPrice() * p.getQuantity();\n            total += subtotal;\n%>\n    &lt;tr>\n        &lt;td>&lt;%=p.getName()%>&lt;\/td>\n        &lt;td>&lt;%=p.getPrice()%>&lt;\/td>\n        &lt;td>&lt;%=p.getQuantity()%>&lt;\/td>\n        &lt;td>&lt;%=subtotal%>&lt;\/td>\n        &lt;td>\n            &lt;a href="CartServlet?action=remove&amp;id=&lt;%=p.getId()%>">\u5220\u9664&lt;\/a>\n        &lt;\/td>\n    &lt;\/tr>\n&lt;%\n        }\n    }\n%>\n&lt;\/table>\n\n&lt;h3>\u603b\u4ef7\uff1a&lt;%=total%>&lt;\/h3>\n\n&lt;a href="CartServlet?action=clear">\u6e05\u7a7a\u8d2d\u7269\u8f66&lt;\/a>\n&lt;br>\n&lt;a href="product.jsp">\u7ee7\u7eed\u8d2d\u7269&lt;\/a>\n&lt;\/body>\n&lt;\/html>\n\n<\/pre><\/div>\n\n\n
      \n\n\n\n
      \u4e03\u3001\u8fd0\u884c\u6d41\u7a0b\u603b\u7ed3\uff08\u8003\u8bd5\u5fc5\u80cc\uff09<\/h1>\n\n\n\n
        \n
      1. \u7528\u6237\u8bbf\u95ee\u5546\u54c1\u9875\u9762<\/li>\n\n\n\n
      2. \u70b9\u51fb\u300c\u52a0\u5165\u8d2d\u7269\u8f66\u300d<\/li>\n\n\n\n
      3. \u8bf7\u6c42\u53d1\u9001\u5230 Servlet<\/li>\n\n\n\n
      4. Servlet \u4ece Session \u53d6\u8d2d\u7269\u8f66<\/li>\n\n\n\n
      5. \u6dfb\u52a0\/\u4fee\u6539\u5546\u54c1<\/li>\n\n\n\n
      6. \u8fd4\u56de\u8d2d\u7269\u8f66\u9875\u9762<\/li>\n\n\n\n
      7. JSP \u5c55\u793a Session \u4e2d\u7684\u6570\u636e<\/li>\n<\/ol>\n\n\n\n
        \n\n\n\n
        \u516b\u3001\u5e38\u89c1\u9762\u8bd5 \/ \u5b9e\u8bad\u95ee\u9898<\/h1>\n\n\n\n
        Q1\uff1a\u4e3a\u4ec0\u4e48\u4f7f\u7528 Session\uff1f<\/h3>\n\n\n\n
        \u2714 \u56e0\u4e3a Session \u80fd\u533a\u5206\u4e0d\u540c\u7528\u6237\u7684\u8d2d\u7269\u6570\u636e<\/p>\n\n\n\n
        Q2\uff1a\u8d2d\u7269\u8f66\u6570\u636e\u4ec0\u4e48\u65f6\u5019\u9500\u6bc1\uff1f<\/h3>\n\n\n\n
        \u2714 Session \u5931\u6548\uff08\u6d4f\u89c8\u5668\u5173\u95ed \/ \u8d85\u65f6\uff09<\/p>\n\n\n\n
        Q3\uff1a\u771f\u5b9e\u9879\u76ee\u4e2d\u4f1a\u8fd9\u6837\u505a\u5417\uff1f<\/h3>\n\n\n\n
        \u2714 \u5c0f\u9879\u76ee \/ \u6559\u5b66
        \u2718 \u5b9e\u9645\u9879\u76ee\u4f1a\u5b58\u6570\u636e\u5e93 + Redis<\/p>\n\n\n\n
        \n\n\n\n
        \u4e5d\u3001\u53ef\u6269\u5c55\u529f\u80fd\uff08\u52a0\u5206\u9879\uff09<\/h1>\n\n\n\n