我认为没有办法将通用类提供给注解。它应该是编译时常量。
但这怎么样?(大量代码,完整示例)。
Spring基础
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
实体
@MappedSuperclass
@Data
@NoArgsConstructor
@AllArgsConstructor
public abstract class BaseEntity {
@Id
@Column(name = "id")
private Integer id;
@Column(name = "created_at")
private Date createdAt;
}
@Entity
@Table(name = "user")
@Data
@NoArgsConstructor
@AllArgsConstructor
@EqualsAndHashCode(callSuper = true)
public class User extends BaseEntity {
@Column(name = "username")
private String userName;
}
@Entity
@Table(name = "another_user")
@Data
@NoArgsConstructor
@AllArgsConstructor
@EqualsAndHashCode(callSuper = true)
public class AnotherUser extends BaseEntity {
@Column(name = "another_username")
private String anotherUserName;
}
控制器
public abstract class BaseEntityController<T extends BaseEntity> {
private final BaseEntityRepository<T> repository;
@Autowired
protected BaseEntityController(BaseEntityRepository<T> repository) {
this.repository = repository;
}
@GetMapping(value = "/index")
public Page<T> index(Predicate predicate, Pageable pageable) {
return repository.findAll(predicate, pageable);
}
}
@RestController
@RequestMapping("/user")
public class UserController extends BaseEntityController<User> {
protected UserController(BaseEntityRepository<User> repository) {
super(repository);
}
@Override
public Page<User> index(@QuerydslPredicate(root = User.class) Predicate predicate, Pageable pageable) {
return super.index(predicate, pageable);
}
}
@RestController
@RequestMapping("/anotheruser")
public class AnotherUserController extends BaseEntityController<User> {
protected AnotherUserController(BaseEntityRepository<User> repository) {
super(repository);
}
@Override
public Page<User> index(@QuerydslPredicate(root = AnotherUser.class) Predicate predicate, Pageable pageable) {
return super.index(predicate, pageable);
}
}
仓库
@NoRepositoryBean
public interface BaseEntityRepository<T extends BaseEntity> extends CrudRepository<T, Integer>, QuerydslPredicateExecutor<T> {
}
@Repository
public interface UserEntityRepository extends BaseEntityRepository<User> {
}
@Repository
public interface AnotherUserEntityRepository extends BaseEntityRepository<AnotherUser> {
}
它尽可能地工作并抽象化。但是,您仍需要为每个@Entity
生成额外的@Controller
和@Repository
类。虽然它们将大多为空桩,但我认为您无法完全欺骗@Querydsl或Spring Data以正确使用泛型。