數據庫無法連接（JDBC）
用戶名密碼正確，但是一直報錯：Connection timed out
後來知道了原因：我用的是BAE提供的雲mysql數據庫，對訪問的IP有限制 ，所以在本機上無法連接。
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Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: java.net.ConnectException: Connection timed out: connect
STACKTRACE:
java.net.SocketException: java.net.ConnectException: Connection timed out: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2641)
at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at com.fei.keyword.util.JDBCUtil.<init>(JDBCUtil.java:36)
at com.fei.keyword.util.JDBCUtil.main(JDBCUtil.java:15)
** END NESTED EXCEPTION **
Last packet sent to the server was 684 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2707)
at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at com.fei.keyword.util.JDBCUtil.<init>(JDBCUtil.java:36)
at com.fei.keyword.util.JDBCUtil.main(JDBCUtil.java:15)
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