idea springboot报错 Access denied for user ''@'localhost' (using password: NO)

在使用springboot链接数据库时报了如下错误

java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)

	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)

之后发现,原来是idea自动提示的配置文件错误,一开始是这样的

spring:
  datasource:
    data-username: root
    data-password: 123456
    # 如果时区报错就需要添加 serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

改成这样就ok

spring:
  datasource:
    username: root
    password: 123456
    # 如果时区报错就需要添加 serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

如果还报错可能是springboot或者mysql版本问题,我的springboot为2.2.0版本,mysql为8.0版本