Caused by: java.lang.RuntimeException: java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
	at com.baomidou.mybatisplus.generator.config.DataSourceConfig.getConn(DataSourceConfig.java:206)
	at com.baomidou.mybatisplus.generator.config.querys.DecoratorDbQuery.<init>(DecoratorDbQuery.java:58)
	at com.baomidou.mybatisplus.generator.IDatabaseQuery$DefaultDatabaseQuery.<init>(IDatabaseQuery.java:97)
	at com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder.getTableInfoList(ConfigBuilder.java:139)
	at com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine.batchOutput(AbstractTemplateEngine.java:226)

解决：

private static String DATA_BASE_URL = "jdbc:mysql://127.0.0.1:3306/excel-data?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC";
    private static String DATA_BASE_USERNAME = "root";
    private static String DATA_BASE_PASSWORD = "root";

1.在连接字符串后面加上?serverTimezone=UTC

其中UTC是统一标准世界时间。

2.useUnicode=true&characterEncoding=UTF-8，这个是解决中文乱码输入问题