java - 如何对非实体的对象进行分页？

Question

我正在尝试进行分页，与@RepositoryRestResource的选项非常相似但仅限于非实体的对象。

代码:

public class FloorplanDevice {

private String FloorplanName;
private Long FloorplanId;

private Long DeviceId;
private String DeviceName;
private String macAddress;
private Long groupId;
private LocatableType deviceType;

public String getFloorplanName() {
    return FloorplanName;
}

public void setFloorplanName(String floorplanName) {
    FloorplanName = floorplanName;
}

public Long getFloorplanId() {
    return FloorplanId;
}

public void setFloorplanId(Long floorplanId) {
    FloorplanId = floorplanId;
}

public Long getDeviceId() {
    return DeviceId;
}

public void setDeviceId(Long deviceId) {
    DeviceId = deviceId;
}

public String getDeviceName() {
    return DeviceName;
}

public void setDeviceName(String deviceName) {
    DeviceName = deviceName;
}

public String getMacAddress() {
    return macAddress;
}

public void setMacAddress(String macAddress) {
    this.macAddress = macAddress;
}

public Long getGroupId() {
    return groupId;
}

public void setGroupId(Long groupId) {
    this.groupId = groupId;
}

public LocatableType getDeviceType() {
    return deviceType;
}

public void setDeviceType(LocatableType deviceType) {
    this.deviceType = deviceType;
}

public FloorplanDevice() {
}

public FloorplanDevice(String floorplanName, Long floorplanId, Long deviceId, String deviceName, String macAddress, Long groupId, LocatableType deviceType) {
    FloorplanName = floorplanName;
    FloorplanId = floorplanId;
    DeviceId = deviceId;
    DeviceName = deviceName;
    this.macAddress = macAddress;
    this.groupId = groupId;
    this.deviceType = deviceType;
  }
}

此对象没有存储库，但它有 Controller :

   @RequestMapping(
      path = arrayOf("/floorplanDevice/{groupId}", "/floorplanDevice/{groupId}/"),
      method = arrayOf(RequestMethod.GET))
 open fun getFloorplanDevice(@PathVariable("groupId") groupId: Long): ResponseEntity<*>{

var floorplanDevice= floorplanService.getFloorplanDevice(groupId)
return ResponseEntity(floorplanDevice, HttpStatus.OK)

 }

那么如何使用页码和大小对该对象进行分页(如果也可以排序)？

我正在使用java Spring

谢谢

Answer 1

尝试这样的事情:

public Page<FloorplanDevice> getFloorplanDevice(@PathVariable("groupId") Long groupId, 
            @PageableDefault Pageable pageable)
    List<FloorplanDevice> list = floorplanService.getFloorplanDevice(groupId);

    MutableSortDefinition sort = pageable.getSort() != null ?
            StreamSupport.stream(pageable.getSort().spliterator(), false)
                .findFirst()
                .map(it -> new MutableSortDefinition(it.getProperty(), it.isIgnoreCase(), it.isAscending()))
                .orElse(null)
            : null;

    PagedListHolder<FloorplanDevice> pageHolder = new PagedListHolder<>(list, sort);
    pageHolder.setPage(pageable.getPageNumber());
    pageHolder.setPageSize(pageable.getPageSize());
    pageHolder.resort();

    List<FloorplanDevice> content = pageHolder.getPageList();
    Page<FloorplanDevice> page = new PageImpl<>(content, pageable, list.size());

    return page;
}