• 先看这篇文章，如何生成加密后的密码及秘钥：https://github.com/alibaba/druid/wiki/%E4%BD%BF%E7%94%A8ConfigFilter
• 配置

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
# 加密后的密码（原密码 123456）
spring.datasource.password=WVMjPhfXQrIsWRo0/RCqAVvYtTU9WNVToKJohb8AlUmHwnV6vwFL+FM2CNFDMJwGHW1iCmyaUlF+sgvFdogqEA==
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# 公钥
publickey=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIiwHpFrDijV+GzwRTzWJk8D3j3jFfhsMFJ/7k1NTvBuLgL+TdIHgaMNOIEjHpXzuvX38J3FtOK8hLrySncVGOMCAwEAAQ==
# 配置 connection-properties，启用加密，配置公钥。
spring.datasource.druid.connection-properties=config.decrypt=true;config.decrypt.key=${publickey}
# 启动ConfigFilter
spring.datasource.druid.filter.config.enabled=true