AOP implementation of return value decryption

Question

demand：Decryption of database query results with AOP MybatisPlus Return results,for example：List

I customize an annotation to intercept annotated methods, But I intercepted the method and got that the return type is List,How can I get the VO type in the list

@Component
@Aspect
@Order
public class DecryptrResultAspect {

    @Pointcut("@annotation(com.sgcc.hr.recruit.graduate.common.utils.NeedDncryptResult)")
    public void rsaDecodeSecurityParameterAspect() {
    }


    @After("rsaDecodeSecurityParameterAspect()")
    public void decode(JoinPoint joinPoint) {
        try {
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();
            Class returnType = signature.getReturnType();
            System.out.println(returnType);
            // output interface java.util.List

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}