mysql默认服务器时区问题:修改jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8为
jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
字面意思 mysqljdbc . driver。这是被弃用的。新的驱动类是“com.mysql.cjdbc.driver”。驱动程序通过SPI自动注册，而手动加载类通常是不必要的。
那么我只需要把 com.mysql.jdbc.Driver 改为com.mysql.cj.jdbc.Driver 即可
java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time
从错误上看应该是时区的错误，因此只需要设置为你当前系统时区即可
static final String DB_URL="jdbc:mysql://localhost:3306/csm"+"?serverTimezone=GMT%2B8";
加上?serverTimezone=GMT%2B8" 即可 GMT%2B8代表： 东八区
GMT%2B8代表是东八区
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