概述
20-Aug-2021 17:59:15.065 严重 [Druid-ConnectionPool-Create-1942040900] com.alibaba.druid.pool.DruidDataSource.error create connection SQLException, url: jdbc:mysql://localhost:3306/book, errorCode 0, state S1000
java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
方法一：由于版本各种问题，字符集不统一，在连接数据库的URL指定字符集
url=jdbc:mysql://localhost:3306/book?characterEncoding=UTF-8
方法二：
发生这个错误的时候，一个可能是mysql jar包连接数据库的版本过低，字符集发生改变，换个高版本的mysql-connector-java
最后
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