controller中,返回原来页面,加入info
adminService.publishActivity(activity);
ModelAndView modelAndView = new ModelAndView("/admin/activity_publish");
modelAndView.addObject("info", "success");
return modelAndView;
jsp中
<%
if ((String)request.getAttribute("info") == "success") { %>
<script>
alert("添加活动成功!");
</script>
<%}%>