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//存在,把USER放到session中转向主页
HttpSession session = request.getSession();
session.setAttribute("username", username);
request.getRequestDispatcher("/index.jsp").forward(request, response);
//从session中删除user
HttpSession session =request.getSession();
session.removeAttribute("username");
//转向主页
request.getRequestDispatcher("/index.jsp").forward(request, response);
//判断当前用户是否登录
String loginuser = (String) request.getSession().getAttribute("username");
if (loginuser != null && loginuser.equals(username)) {
//当前登录用户已经存在,不能重复登录
request.setAttribute("message", "当前用户已经登录,不能重复登录");
request.getRequestDispatcher("/message.jsp").forward(request, response);
return;
}