在 java servlet 中获取 Cookie

Question

我在使用 servlet 创建 cookie 并存储到另一个页面时遇到问题。 我没有创建 JSESSIONID，我只是创建名称， 但是为什么刷新页面时JSESSIONID总是自动创建 请帮帮我

enter image description here

    public class ControllerHelper extends HelperBase {
private static final long serialVersionUID = 1L;

public ControllerHelper(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

        super(request, response);
    }


public void doGet(String address) throws ServletException, IOException {
    request.getSession().setAttribute("helper", this);
    PrintWriter out = response.getWriter();
    Cookie[] ck=request.getCookies();
    response.setContentType("text/html");
    if(ck!=null) {

        String name=ck[1].getValue();
          if(!name.equals("")||name!=null){  
              out.print("<b>Welcome to Profile</b>");  
              out.print("<br>Welcome, "+name);  
          }  

        request.setAttribute("stts_log", "Login");
        request.setAttribute("sess", name);
        request.setAttribute("btn_modal", "exambutton");
        request.setAttribute("btn_href", "#");

    }else {
        request.setAttribute("sess", "");
        request.setAttribute("stts_log", "Logout");
        request.setAttribute("btn_modal", "");
        request.setAttribute("btn_href", "logout");
    }

    request.getRequestDispatcher("/view/header.jsp").include(request, response);
    request.getRequestDispatcher("/view/"+address).include(request, response);
    request.getRequestDispatcher("/view/footer.jsp").include(request,response);
}

Answer 1

为什么刷新页面时JSESSIONID总是自动创建

因为 request.getSession().setAttribute("helper", this); 创建了您的 sessionid（JSESSIONID 是一个会话跟踪 cookie）。