我想用spring boot实现hateoas。我实现了它,现在我有另一个分页问题。我想说的是分页的工作原理如下:
{
"links": [
{
"rel": "first",
"href": "http://localhost:8080/api/posts?bookId=1&page=0&size=2"
},
{
"rel": "self",
"href": "http://localhost:8080/api/posts?bookId=1&page=0&size=2"
},
{
"rel": "next",
"href": "http://localhost:8080/api/posts?bookId=1&page=1&size=2"
},
{
"rel": "last",
"href": "http://localhost:8080/api/posts?bookId=1&page=1&size=2"
}
],
"content": [
{
"id": 1,
"bookId": 1,
"title": "UpdatedPost1Title",
"content": "UpdatedPost1Content",
"created": "2021-01-18T20:42:39",
"updated": "2021-01-18T23:16:48",
"voteUp": 0,
"voteDown": 0,
"links": [
]
},
{
"id": 2,
"bookId": 1,
"title": "title2",
"content": "content2",
"created": "2021-01-18T20:42:43",
"updated": "2021-01-18T20:42:43",
"voteUp": 0,
"voteDown": 0,
"links": [
]
}
],
但正如你所看到的,我所有的内部“链接”都是空的。我运行了调试器,导致这种奇怪行为的一行代码是:
PagedModel<EntityModel<PostDto>> page = pagedResourcesAssembler.toModel(postPage);
通过此方法:
@GetMapping
@ResponseStatus(HttpStatus.OK)
public ResponseEntity<PagedModel<EntityModel<PostDto>>> getPosts(@RequestParam(required = false) Long bookId,
@PageableDefault(size = DEFAULT_PAGE_SIZE) Pageable pageable) {
Optional<Long> bookParam = Optional.ofNullable(bookId);
Page<PostDto> postPage = bookParam.map(aLong -> postService.getByBookId(aLong, pageable).map(assembler::toModel))
.orElseGet(() -> postService.getAllPosts(pageable).map(assembler::toModel));
PagedModel<EntityModel<PostDto>> page = pagedResourcesAssembler.toModel(postPage); //this line
return new ResponseEntity<>(page, HttpStatus.OK);
}
在这一行之前,页面保存了关于我之前添加的内部链接的信息(assembler::tomodel)。
我应该如何防止我的模型被pagedresourcesassembler清除(它是org.springframework.data.web.pagedresourcesassembler)。
提前谢谢!
1条答案
按热度按时间xuo3flqw1#
是的,我在这里找到了答案:https://howtodoinjava.com/spring5/hateoas/pagination-links/. 应该是这样的:
如您所见,pagedresourcesassembler应该是实体类型,而不是模型类型。在创建pagedmodel和使用.tomodel(page,representationmodelassembler)方法之前,我还移除了Map。