1，后台三种跳转页面的方式
1，response.sendRedirest("/home/login.html");
2, PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<script>");
out.println("top.location.href = '/home/login.html'");
out.println("</script>");
out.println("</html>");
System.out.println( out);
3,PrintWriter out = response.getWriter();
out.println("<script>top.location.href = '/home/login.html'</script>");
