java - spring data JPA 中 api Page 的空数据

Question

@RestController
@Transactional
public class ApiController {

    @Autowired
    CategoryService categoryService;

    @SuppressWarnings("deprecation")
    @RequestMapping(value="/api/category/page", method=RequestMethod.GET)
    public Page<Category> getCategoryList() {
        return categoryService.findAll(new PageRequest(0, 10));
    }

}

我想检索在 angularjs 中使用的页面，它不返回任何内容:{}。当我 getContent () 时，数据仍然可以根据请求获取:

 [{"cid": 1, "cname": "Tien Hiep", "cmetaTitle": "tien-hiep", 
 "createDate": "May 6, 2018 1:04:58 PM "," createBy ":" Admin "," 
 modifiedDate ":" May 28, 2018 11:09:57 AM "," modifiedBy ":" Admin 
 "," cstatus " ..]

如果我想返回页面类型，例如:

    {
        "content":[
            {"cid": 1, "cname": "Tien Hiep", "cmetaTitle": "tien-hiep", "createDate": "May 6, 018 1:04:58 PM "," createBy ":" Admin "," modifiedDate ":" May 28, 2018 11:09:57 AM "," modifiedBy ":" Admin "," cstatus "}, 
            ...
        ],
        "last":false,
        "totalElements":10,
        "totalPages":4,
        "size":10,
        "number":0,
        "sort":null,
        "first":true,
    }

谁能帮我解决这个问题吗？

Answer 1

如果添加具有页面限制和偏移量的 PageRequest，JPA 将以 Page 而不是 List 的形式返回响应。因此，在将页面发送到应用程序之前，您必须使用 .getContent() 将页面转换为列表。这样该应用程序就可以毫无问题地运行。

PageRequest pageable= createPageRequest(page,size,sortBy,sortField); /** method to return PageRequest */
Page<TestData> pageList = testDataRepository.findAll(pageable);
List<TestData> testDataList = pageList.getContent();

将返回类型更改为 List 并添加@Produces("application/json")，以便 API 将以 json 形式返回数据。

如果使用 maven 添加 jax-rs 或 jersey 依赖项