一、問題描述：

　　1、使用的SpringBoot版本為2.2.2RELEASE

<spring-boot.version>2.2.2.RELEASE</spring-boot.version>

　　2、引入mysql驅動的依賴時，預設版本為8.0.18

<version>8.0.18</version>

　　3、在配置檔案中對資料庫的配置：

datasource:
  driver-class-name: com.mysql.cj.jdbc.Driver
  url: jdbc:mysql://localhost/shop?useUnicode=true&characterEncoding=UTF-8
  username: root
  password: '123456'
 

二、測試報錯

　　org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: The server time zone value '�й���׼ʱ��' 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.

　　Caused by: java.sql.SQLException: The server time zone value '�й���׼ʱ��' 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.

報錯的原因為：'伺服器時區值'�й���׼ʱ��' 無法識別或表示多個時區。如果要利用時區支援，必須配置伺服器或JDBC驅動程式（通過serverTimezone配置屬性）以使用更具體的時區值。

　　Mysql預設使用的是美國時間，比中國早8個小時

三、解決方法

　　在datasource的url中最後再加上serverTimezone屬性serverTimezone=UTC或者serverTimezone=GMT%2B8

datasource:
  driver-class-name: com.mysql.cj.jdbc.Driver
  url: jdbc:mysql://localhost/shop?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
  username: root
  password: '123456'