进入到druid-1.0.27.jar文件下载的目录，执行以下操作
java -cp druid-1.0.27.jar com.alibaba.druid.filter.config.ConfigTools you_password
下面是例子
java -cp druid-1.0.27.jar com.alibaba.druid.filter.config.ConfigTools 123456
回车之后得到下面的数据
私钥
privateKey:MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEAovl027wL8dFaWuTeIsVXS
LYxKEjKwCLZlWiYq26cVPpINih1BWPSdQ5y5JzlcEeYKdLhmFjIbtEW44+zYfzOgwIDAQABAkBL0PDkK
B8GZ/Y4wq/0TQnF8bv8maB4sb23G+mqFtLzVJrE3qX+3VU5MO0Ac43krZ6N3XZ6Sg6O8M3LijNMj1MBA
iEA8xasZ0e72aUWEBjNDYDmqPyb1MouZ7d4rW1vEYBR6dMCIQCroXRN+uQO7M2trv1VjGbiuF2jeoeKf
XJeV1yg4mJqkQIgbPMjkCKhefm4urwy4zN7rg+R1DxNsiSUDL64ghKOJAsCIQCUEwHi3VixP8Db3iOXE
UEazfGLv4T9COoJVtoFvAso4QIhAKgbsS66Gl8iLI8QkXyAG0oYam/KDBi4sQDrVBuaeKuu
公钥
publicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKL5dNu8C/HRWlrk3iLFV0i2MShIysAi2ZVomK
tunFT6SDYodQVj0nUOcuSc5XBHmCnS4ZhYyG7RFuOPs2H8zoMCAwEAAQ==
加密后的密码
password:cRMYiJ6jH6BKIJAiu/NU54Z15wJdn3qcbdNL4gkICwgMdjvN0QyHs6+6a55Wynh3Prxr10V
2t96oQI1gXXhVRQ==
配置数据源，提示Druid数据源需要对数据库密码进行解密。
在application.properties文件中
spring.datasource.password=加密后的密码
spring.datasource.publickey=公钥
配置参数，让ConfigFilter解密密码
可以在配置文件application.properties中指定config.decrypt=true
在DruidDBConfig.java中进行调用ConfigTools.decrypt(publicKey, password)进行解密
