原因是：遠程服務器不允許你的java程序訪問它的數據庫。所以，我們要對遠程服務器進行設置，使它允許你進行連接。
解決步驟
1、打開mysql控制台，輸入：use mysql;
2、輸入：show tables;
3、輸入：select host from user;
4、輸入：update user set host ='%' where user ='root';
5、重啟服務就可以連上了
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