向实体对象注入服务

@Entity
@Configurable(autowire=Autowire.BY_TYPE)
@Table(name="WARD")
public class Ward {

@Column(name = "HOSPITAL_ID")
private Long hospitalId;

@Transient
@Autowired
private HospitalService hospitalService;

public Long getHospitalId() {
    return hospitalId;
}

public void setHospitalId(Long hospitalId) {
    this.hospitalId = hospitalId;
}

@PreUpdate
@PrePersist
private void preUpdatePersist(){
    if(hospitalId == null && hospitalService != null)
        hospitalId = hospitalService.getSelectedHospital().getId();
}}