1.mysql 删除语句使用别名时出错，还需要在DELETE FROM之间添加别名
DELETE 别名 FROM 表名称 别名 WHERE 列名称 = 值
2.session过期跳转到登录页面并跳出iframe
<script type="text/javascript">
if (window != top) {
top.location.href = location.href;
}
</script>
或者filter中
java.io.PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<script>");
out.println("window.open ('/portal.jsp','_top')");
out.println("</script>");
out.println("</html>");
return;
3.HttpMessageNotReadableException 异常解决
InvalidFormatException: Can not deserialize value of type java.util.Date
解决办法：https://blog.csdn.net/tiankongzhichenglyf/article/details/90599109