klist -kt  dl.keytab

<dependency>
            <groupId>org.apache.kerby</groupId>
            <artifactId>kerb-client</artifactId>
            <version>2.0.1</version>
        </dependency>

 Keytab keytab = Keytab.loadKeytab(new File("D:\\dl.keytab"));
        keytab.getPrincipals().forEach(entry -> {
            System.out.println("Principal: " + entry.getName());
        });