null, message from server: "Host 'PC-20130201IBXI' is blocked because of many connection errors; un
忽然一天，資料庫連線拋了異常：null, message from server: "Host 'PC-20130201IBXI' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'"。
話說是同一IP短時間內連線資料庫太多二致，記得以前也出現過這種錯，解決辦法記下（windows機器）：
命令：net start mysql
命令：cd D:\Tools\MySQL5.5.25\bin
命令：mysql -hlocalhost -uroot -p
命令：flush hosts
重啟mysql，
重啟tomcat
成功
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