英文:
Spring Boot, upload any amount of files in REST controller
问题
我想创建一个端点，接受用户上传的任意数量的不同文件。
例如：
然后，我想在我的控制器中将其作为 Map<String, FilePart>（或者从中我可以知道哪个文件是哪个的任何其他结构）来接收：
{
"file1": "cactus-logo.png",
"file2": "logo.png",
"file3": "logo.png"（这一个实际上与file2不同，但文件名相同）
}
我尝试过一些@RequestPart的组合...
- 当我使用：
@RequestPart Map<String, FilePart> files
或者
@RequestPart MultiValueMap<String, FilePart> files
我得到：
org.springframework.web.server.ServerWebInputException: 400 BAD_REQUEST "Required request part 'files' is not present"
- 当我使用：
@RequestPart("files") List<FilePart> files
我需要像这样提交文件：
然后我无法知道哪个文件是哪个（如果它们具有相同的名称）：
- 最后，我可以这样做：
@RequestPart("file1") FilePart file1,
@RequestPart("file2") FilePart file2,
@RequestPart("file3") FilePart file3
然后它按预期工作，但是这样只能始终提交3个文件。我想提交任意数量的文件。
- 如评论中所建议的：
@PutMapping(value = "/{component}", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public void upload(
@RequestParam Map<String, MultipartFile> files
) throws IOException {
而且这个映射始终为空：
英文:
I'd like to create an endpoint which accepts any amount od different files from user.
For example:
Then, I'd like to receive it in my controller as a Map<String, FilePart> (or any other structure from which I'll know which file is which):
{
"file1": "cactus-logo.png",
"file2": "logo.png",
"file3": "logo.png" (this one is actually different than file2 but has the same name)
}
I tried some combinations of @RequestPart...
-
When I do:
@RequestPart Map<String, FilePart> files
or
@RequestPart MultiValueMap<String, FilePart> files
I'm getting:
> org.springframework.web.server.ServerWebInputException: 400 BAD_REQUEST "Required request part 'files' is not present"
-
When I do:
@RequestPart("files") List<FilePart> files
I need to submit files like that:
And then I don't have the information which file is which (if they have the same name):
-
Finally, I can do:
@RequestPart("file1") FilePart file1, @RequestPart("file2") FilePart file2, @RequestPart("file3") FilePart file3
And then it works as expected, but with that, it's possible to submit always only 3 files. I'd like to submit any number of files.
-
As suggested in comments:
@PutMapping(value = "/{component}", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) public void upload( @RequestParam Map<String, MultipartFile> files ) throws IOException {
and the map is always empty:
答案1
得分: 2
你应该使用@RequestParam
@PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public void upload(@RequestParam Map<String, MultipartFile> body) {
}
然后通过表单数据媒体进行发布：
file1: 选择文件
file2: 选择文件
file3: 选择文件
....
英文:
You should use @RequestParam
@PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public void upload(@RequestParam Map<String, MultipartFile> body) {
}
Then post via form-data media ie:
file1: select file
file2: select file
file3: select file
....
答案2
得分: 0
我没有提到我在使用响应式的 WebFlux，因此 @Toàn Nguyễn Hải 提供的解决方案在我的情况下不适用。我相信它适用于非响应式的应用程序。
对于 WebFlux，以下方法有效：
公平地说，我不会接受任何答案，因为它们都可以。谢谢！
英文:
I did not mention I'm using reactive webflux, thus solution posted by @Toàn Nguyễn Hải does not work in my case. I believe it works in non-reactive applications.
For web flux, the following works:
To be fair, I won't accept any answer, because both of them are fine.
Thanks!
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