PagingAndSortingRepository - 自定义可分页响应结构 [英] PagingAndSortingRepository - custom pageable response structure

问题描述

有没有办法简化从这个控制器返回的结构:

Is there a way to simplify the structure returned from this controller:

@GetMapping
public Iterable<Task> getAll(@PathParam("page") int page) {
    Pageable pageable = PageRequest.of(page, 3);

    return taskRepository.findAll(pageable);
}

现在响应的正文如下:

localhost:8080/api/task?page=2

{
    "content": [
        ...
    ],
    "pageable": {
        "sort": {
            "sorted": false,
            "unsorted": true,
            "empty": true
        },
        "offset": 6,
        "pageSize": 3,
        "pageNumber": 2,
        "paged": true,
        "unpaged": false
    },
    "totalElements": 19,
    "last": false,
    "totalPages": 7,
    "number": 2,
    "size": 3,
    "sort": {
        "sorted": false,
        "unsorted": true,
        "empty": true
    },
    "numberOfElements": 3,
    "first": false,
    "empty": false
}

有什么办法可以精简这些数据吗?如果我现在对排序不感兴趣，只想返回这样的东西怎么办:

Is there any way to strip down on this data? What if I am not interested in sorting right now and only want to return something like this:

{
    "content": [
        ...
    ],
    "pageable": {
        "pageSize": 3,
        "pageNumber": 2,
        "totalElements": 19,
    },
}

所以当前的响应有太多我并不真正需要的属性.实现这一目标的好方法是什么?如果我想自定义这么多，我应该完全不同吗?

So the current response just has too many properties I don't really need. What is a good way to achieve this? Should I be doing this completely differently if I want to customize it so much?

推荐答案

另一种方法是根据需要创建自定义页面类并从数据创建并返回

Another way is to create a custom page class as you want and create from your data and return

@Data
public class CustomPage<T> {
  List<T> content;
  CustomPageable pageable;

  public CustomPage(Page<T> page) {
    this.content = page.getContent();
    this.pageable = new CustomPageable(page.getPageable().getPageNumber(),
        page.getPageable().getPageSize(), page.getTotalElements());
  }

  @Data
  class CustomPageable {
    int pageNumber;
    int pageSize;
    long totalElements;

    public CustomPageable(int pageNumber, int pageSize, long totalElements) {

      this.pageNumber = pageNumber;
      this.pageSize = pageSize;
      this.totalElements = totalElements;
    }
  }
}

像这样使用

@GetMapping
public CustomPage<Task> getAll(@PathParam("page") int page) {
    Pageable pageable = PageRequest.of(page, 3);
    return new CustomPage<Task>(taskRepository.findAll(pageable));
}

注意: 这里是Lombok的@Data，用于setter getter等

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