问题描述：
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
项目的/src/main/resources/application.properties的文件内容如下：
mybatis.config-locations=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:dao/*.xml
mybatis.type-aliases-package=com.pblog.domain
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/pblog?useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.username =root
spring.datasource.password =Root
出错原因：spring.datasource.password =Root （密码Root后面多了一个空格）。