我不想公开我的模型类(jpa实体),而是使用不同的数据传输对象(DTO)来公开其属性的不同子集。
这个想法是DTO CrudRepository <-> JpaRepository <-> entities
,我希望通过Spring Data REST公开DTO CrudRepository
。
示例:
实体:
@Entity
@Table(name = "groups")
public class Group {
private Long id;
private String name;
private Set<User> users;
// other attributes
@Id
@GeneratedValue
@Column(name = "group_id")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name = "name", nullable = false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany(mappedBy = "group")
public Set<User> getUsers() {
return users;
}
public void setUsers(Set<User> users) {
this.users = users;
}
// other getters and setters
}
JpaRepository:
@RepositoryRestResource(exported = false)
public interface GroupDao extends JpaRepository<Group, Long> {
}
DTO:
public class GroupWithoutRelationsDto {
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@NotBlank
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
DTO CrudRepository:
public interface GroupDtoDao extends CrudRepository<GroupWithoutRelationsDto, Long> {
}
实现:
@Repository
public class GroupDtoDaoImpl extends GenericDtoDao<GroupWithoutRelationsDto, Group, Long> implements GroupDtoDao {
@Autowired
private GroupDao groupDao;
@Override
protected CrudRepository<Group, Long> getModelDao() {
return groupDao;
}
@Override
protected <S extends GroupWithoutRelationsDto> Long getDtoId(S dto) {
return dto.getId();
}
@Override
protected Long getModelId(Group model) {
return model.getId();
}
@Override
protected <S extends GroupWithoutRelationsDto> S modelToDto(Group model, S dto) {
dto.setId(model.getId());
dto.setName(model.getName());
return dto;
}
@Override
protected <S extends GroupWithoutRelationsDto> Group dtoToModel(S dto, Group model) {
model.setId(dto.getId());
model.setName(dto.getName());
return model;
}
@Override
protected Group newModel() {
return new Group();
}
@Override
protected GroupWithoutRelationsDto newDto() {
return new GroupWithoutRelationsDto();
}
}
GenericDtoDao:
@NoRepositoryBean
public abstract class GenericDtoDao<D, M, ID extends Serializable> implements CrudRepository<D, ID> {
protected abstract CrudRepository<M, ID> getModelDao();
protected abstract <S extends D> ID getDtoId(S dto);
protected abstract ID getModelId(M model);
protected abstract <S extends D> S modelToDto(M model, S dto);
protected abstract <S extends D> M dtoToModel(S dto, M model);
protected abstract M newModel();
protected abstract D newDto();
@Override
public D findOne(ID id) {
return modelToDto(getModelDao().findOne(id), newDto());
}
@Override
public <S extends D> S save(S entity) {
Assert.notNull(entity, "The entity must not be null!");
if (getDtoId(entity) == null) {
return create(entity);
}
return update(entity);
}
protected <S extends D> S create(S entity) {
Assert.notNull(entity, "The entity must not be null!");
if (getDtoId(entity) != null) {
Assert.isTrue(!exists(getDtoId(entity)), "The entity ID must be null or not exist!");
}
return modelToDto(getModelDao().save(dtoToModel(entity, newModel())), entity);
}
protected <S extends D> S update(S entity) {
Assert.notNull(entity, "The entity must not be null!");
M model = getModelDao().findOne(getDtoId(entity));
Assert.notNull(model, "The entity must exist!");
return modelToDto(getModelDao().save(dtoToModel(entity, model)), entity);
}
// other CrudRepository methods
}
在这个例子中,我想用Spring数据REST公开GroupDtoDao。
在其他bean中我可以自动装配GroupDao和GroupDtoDao,因此两者都由Spring的上下文管理。如果我不用GroupDao
注释@RepositoryRestResource(exported = false)
,那么JpaRepository将作为REST服务公开,所以我认为Spring数据REST配置得很好。
如何告诉它公开我的自定义CrudRepository?
答案 0 :(得分:2)
有a JIRA issue来澄清如何做到这一点。
目前,SDR团队表示“我们通常建议只使用Jackson mixins来连接自定义序列化程序,自定义输出等。有关示例,请参阅Spring RESTBucks。”