报错Failed to configure a DataSource: ‘url‘ attribute is not specified and no embedded

错误原因：
mysql的配置的yaml文件里内容写错了。
解决办法：
改为正确的配置信息

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/fmmall2?characterEncoding=utf-8&useUnicode=true
    username: root
    password: 123456