//get the key by other interface
String SecValue = keyVaultService.getSecretValue("secret-hk01-eas-s-giw-aes02");
//use the key to decrypt the encrypt string
SymmetricCrypto aes = new SymmetricCrypto(SymmetricAlgorithm.AES,SecValue.getBytes());
String claimant_de = aes.decryptStr(claimant, CharsetUtil.CHARSET_UTF_8);
String diagnosisDesc_de = aes.decryptStr(diagnosisDesc, CharsetUtil.CHARSET_UTF_8);
System.out.println(claimant_de);
System.out.println(diagnosisDesc_de);
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.3.2</version>
</dependency>