writer.write("登陆失败");
ServletContext servletContext = DoLogin.this.getServletContext();
if (servletContext==null) {
System.out.println("111 "+"servletContext");
}
final RequestDispatcher requestDispatcher = servletContext.getRequestDispatcher("/servlet/Login");
if (requestDispatcher==null) {
System.out.println("222 "+"requestDispatcher");
}
Timer timer = new Timer();
timer.schedule(new TimerTask() {
public void run() {
try {
System.out.println("hehe="+Thread.currentThread().getName());
if (request==null) {
System.out.println("333 "+"request");
}
if (response==null) {
System.out.println("444 "+"response");
}
requestDispatcher.forward(request, response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, 2000);// 设定指定的时间time,此处为2000毫秒
我就想问问,为什么报null指针,这行:requestDispatcher.forward(request, response);