问题 ：连接MySQL数据库时抛出异常信息： com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Public Key Retrieval is not allowed
一开始aplication.yml配置如下所示：
spring:
application:
name: service-provider-sentinel9999
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/gwmdb?useSSL=false&useUnicode=true&characterEncoding=UTF-8
username: root
password: root
后来找了一些解决方案，发现是MySQL 8.0版本导致的问题，需要在后面加 allowPublicKeyRetrieval=true，如下所示：
spring:
application:
name: service-provider-sentinel9999
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/gwmdb?useSSL=false&useUnicode=true&characterEncoding=UTF-8&allowPublicKeyRetrieval=true
username: root
password: root
然后重新启动服务即可！
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