1.首先，添加jasypt依赖

    <dependency>
      <groupId>com.github.ulisesbocchio</groupId>
      <artifactId>jasypt-spring-boot-starter</artifactId>
      <version>2.1.0</version>
    </dependency>

2.然后win+r，cmd调出窗口，添加加密指令

java -cp E:\Softeare\apache-maven-3.6.0\repository\org\jasypt\jasypt\1.9.2\jasypt-1.9.2.jar org.jasypt.intf.cli.JasyptPBEStringEncryptionCLI input="root" password=123456 algorithm=PBEWithMD5AndDES

3.在yml文件中添加jasypt密钥

jasypt:
  encryptor:
    password: 123456

4.将数据库密码修改成ENC(fBKD1fUlxJhw4PqWuh5oQQ==)（fBKD1fUlxJhw4PqWuh5oQQ==是加密后的密码），添加ENC()可以自动解密。

  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url:
    username: ${DATASOURCE_USERNAME}
    password: ENC(fBKD1fUlxJhw4PqWuh5oQQ==)