mysql的連接錯誤，在網上查找到是編碼不匹配的原因，
直接在連接的URL后加上?useUnicode=true&characterEncoding=utf8就可以了
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Exception in thread "main" java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
Unknown character set index for field '255' received from server.
【java報錯】Unknown character set index for field '224' received from server.
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
右鍵tomcat找不到項目：There are no resources that can be added or removed from the server.
java.io.EOFException: Can not read response from server. Expected to read 4 bytes,
docker自制jar包鏡像運行容器報（The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.）
tomcat鏈接mysql時超時報錯java.io.EOFException: Can not read response from server. Expected to read 4 bytes,
skip-character-set-client-handshake 與 character-set-client-handshake
數據庫連接超時Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.