servlet:
。
HttpSession session=request.getSession(true);
session.setAttribute("studentBean",studentBean );
JSP页面:
Student student=null;
student=(Student)session.getAttribute("studentBean");
一直报空指针异常??? 啥情况
。
HttpSession session=request.getSession(true);
session.setAttribute("studentBean",studentBean );
JSP页面:
Student student=null;
student=(Student)session.getAttribute("studentBean");
一直报空指针异常??? 啥情况
时studentBean没有值导致报空指针异常
。
HttpSession session=request.getSession(true); //这里是唯一会出现异常地方 如果request是空
session.setAttribute("studentBean",studentBean );
JSP页面:
Student student=null;
student=(Student)session.getAttribute("studentBean");
一直报空指针异常??? 啥情况
request.getSession().setAttribute("studentBean",studentBean );
jsp中这样获取:
request.getSession().getAttribute("studentBean",studentBean );
request.getSession().setAttribute("studentBean",studentBean );
jsp中这样获取:
request.getSession().getAttribute("studentBean");
RequestDispatcher dispatcher = request.getRequestDispatcher("StudentMain.jsp");
dispatcher.forward(request, response);