response.sendRedirect()跳转失败
http://localhost:8080//ServletLoginDemo/login.jsp页面输入登录后,跳转到http://servletlogindemo/login_success.jsp
为什么 response.sendRedirect(request.getContextPath()+"/login_success.jsp"); 得不到正确的:http://localhost:8080//ServletLoginDemo/login_success.jsp