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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>
<%}%>