报错信息
这个意思是SpringBoot中已经有一个名称相同的Bean，并且不允许重写这个Bean
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APPLICATION FAILED TO START
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Description:
The bean 'dataSource', defined in class path resource [org/apache/shardingsphere/shardingjdbc/spring/boot/SpringBootConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class] and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
解决方法
在application.properties中添加如下配置：允许重写重复的Bean并覆盖掉上一个Bean
spring.main.allow-bean-definition-overriding=true