1．cmd进入druid-***.jar目录
2．输入命令行：
java -cp druid-1.0.16.jar com.alibaba.druid.filter.config.ConfigTools you_password
3．输出：
privateKey:MIIBVgIBADANBgkqhkiG9w0BAQEFAASCAUAwggE8AgEAAkEA6+4avFnQKP+O7bu5YnxWoOZjv3no4aFV558HTPDoXs6EGD0HP7RzzhGPOKmpLQ1BbA5viSht+aDdaxXp6SvtMQIDAQABAkAeQt4fBo4SlCTrDUcMANLDtIlax/I87oqsONOg5M2JS0jNSbZuAXDv7/YEGEtMKuIESBZh7pvVG8FV531/fyOZAiEA+POkE+QwVbUfGyeugR6IGvnt4yeOwkC3bUoATScsN98CIQDynBXC8YngDNwZ62QPX+ONpqCel6g8NO9VKC+ETaS87wIhAKRouxZL38PqfqV/WlZ5ZGd0YS9gA360IK8zbOmHEkO/AiEAsES3iuvzQNYXFL3x9Tm2GzT1fkSx9wx+12BbJcVD7AECIQCD3Tv9S+AgRhQoNcuaSDNluVrL/B/wOmJRLqaOVJLQGg== publicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAOvuGrxZ0Cj/ju27uWJ8VqDmY7956OGhVeefB0zw6F7OhBg9Bz+0c84RjzipqS0NQWwOb4kobfmg3WsV6ekr7TECAwEAAQ== password:PNak4Yui0+2Ft6JSoKBsgNPl+A033rdLhFw+L0np1o+HDRrCo9VkCuiiXviEMYwUgpHZUFxb2FpE0YmSguuRww==
4．配置数据源
spring.datasource.druid.password: ${password}
spring.datasource.druid.connectionProperties:config.decrypt.key=${publicKey}
5．教程：
https://github.com/alibaba/druid/wiki/%E4%BD%BF%E7%94%A8ConfigFilter
原文：https://www.cnblogs.com/daihu/p/14989324.html