User user = new User();
session.setAttribute("user", user);
response.sendRedirect("loginok.jsp");下面是loginok.jsp User user = (User)session.getAttribute("user");
String username = null;
username = user.getUsername();空指针异常,为什么,user对象没有传过来?我用string试验时session传过来了,为什么user就会为空
session.setAttribute("user", user);
//user 还只是一个空对象,要对其赋值才行。、
User user = new User();
session.setAttribute("user", user);
user.setUsername("xxxxxx");
http://bbs.quanlaila.com/thread-2611-1-1.html
User user = new User();
session.setAttribute("user", user);
response.sendRedirect("loginok.jsp");你这个对象里面完全没对象 怎么可能去得到username