servlet后台alert提示至前端

			response.setContentType("text/html;charset=utf-8");
			PrintWriter out = response.getWriter();
			out.print("<script type='text/javascript'>alert('验证码输入错误!')</script>");
			out.print("<script type='text/javascript'>location.href='Admin/AdminLogin.jsp'</script>");
			out.flush();
			out.close();