基于java社区疫情防控管理系统设计与实现(源码+lw+部署文档+讲解等)

    @WebServlet("/login")
    public class LoginServlet extends HttpServlet {
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
    
        // 根据用户数据库验证用户名和密码
        if (isValidUser(username, password)) {
            //登陆成功
            request.getSession().setAttribute("username", username);
            response.sendRedirect("dashboard.jsp"); // Redirect to the dashboard or another secure page
        } else {
            // 登录失败
            response.sendRedirect("login.jsp?error=true");
        }
    }
    
    private boolean isValidUser(String username, String password) {
        // 实现逻辑来验证用户(例如，检查数据库）
        // 如果用户有效则返回true，否则返回false
        //这是一个基本示例
        return "demo".equals(username) && "password123".equals(password);
    }
    }
    @WebServlet("/logout")
    public class LogoutServlet extends HttpServlet {
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 使会话失效以注销用户
        request.getSession().invalidate();
        response.sendRedirect("login.jsp");
    }
    }
    @WebServlet("/dashboard")
    public class DashboardServlet extends HttpServlet {
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 检查用户是否通过认证
        if (request.getSession().getAttribute("username") == null) {
            response.sendRedirect("login.jsp");
            return;
        }
    
        // 显示仪表板
        // 您的安全页面逻辑在这里
        response.getWriter().println("Welcome to the dashboard, " + request.getSession().getAttribute("username"));
    }
    }
    @WebServlet("/dashboard")
    public class DashboardServlet extends HttpServlet {
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 检查用户是否通过认证
        if (request.getSession().getAttribute("username") == null) {
            response.sendRedirect("login.jsp");
            return;
        }
    
        // 显示仪表板
        // 安全页面逻辑在这里
        response.getWriter().println("Welcome to the dashboard, " + request.getSession().getAttribute("username"));
    }
    }