jsp菜单树

<%@ page import="java.util.List" %>
<%@ page import="com.example.MenuItem" %>

<%!
    class MenuItem {
        String name;
        List<MenuItem> children;

        MenuItem(String name, List<MenuItem> children) {
            this.name = name;
            this.children = children;
        }
    }

    MenuItem buildMenu() {
        // 这里可以根据业务逻辑动态生成菜单
        MenuItem item1 = new MenuItem("Home", null);
        MenuItem item2 = new MenuItem("Products", List.of(
            new MenuItem("Electronics", null),
            new MenuItem("Clothing", null)
        ));
        return new MenuItem("Root", List.of(item1, item2));
    }
%>

<%
    MenuItem root = buildMenu();
%>

<ul>
    <% printMenu(root); %>
</ul>

<%!
    void printMenu(MenuItem item) {
        if (item != null) {
%>
            <li><%= item.name %>
                <% if (item.children != null && !item.children.isEmpty()) { %>
                    <ul>
                        <% for (MenuItem child : item.children) { %>
                            <%= printMenu(child); %>
                        <% } %>
                    </ul>
                <% } %>
            </li>
<%
        }
    }
%>