如何使用Spring Boot连接外部/在线LDAP服务器？

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-ldap</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.ldap</groupId>
        <artifactId>spring-ldap-core</artifactId>
    </dependency>
</dependencies>

spring.ldap.urls=ldap://ldap.example.com:389
spring.ldap.base=dc=example,dc=com
spring.ldap.username=cn=admin,dc=example,dc=com
spring.ldap.password=adminpassword

@Entity
public class User {
    @Id
    private String username;
    private String fullName;
    // 其他属性和getter/setter方法
}

public interface UserRepository extends LdapRepository<User> {
    User findByUsername(String username);
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    public User getUserByUsername(String username) {
        return userRepository.findByUsername(username);
    }
}