Unknown initial character set index '255' received from server. Initial client character set can be
原因是MySQL版本高，mysql的jar版本低造成mysql與jar的編碼錯亂引起的，我的MYSQL版本是8.0.11 首先把修改項目連接mysql的url，在最後加上 ?useUnicode=true&characterEncoding=utf8 然後修改Mysql的jar包的版本： 把5.0.4修改爲5.1.46或者更高版本：
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- 1. Unknown initial character set index ‘255‘ received from server. Initial client character set can be
- 2. Unknown initial character set index '255' received from server. Initial client character set can be
- 3. Unknown initial character set index '255' received from server. Initial client character 解決方法
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- 5. Unknown initial character set index '255' received from server
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- 8. Exception in thread 「main「 java.sql.SQLException: Unknown initial character set index ‘255‘ received
- 9. mysql問題，Unknown initial character set index '45' received from server
- 10. Java Web 鏈接MySQL Unknown character set index for field '255' received from server.