带有MultipartFile的Spring Webflux 415-Java 学习之路

我目前正在尝试将文件从Angular 4前端上传到Spring Webflux控制器 . 控制器能够读取@RequestPart值但抛出415 UnsupportedMediaTypeStatusException .

UploadController

@PostMapping( consumes = MediaType.MULTIPART_FORM_DATA_VALUE )
public Mono<Void> save(@RequestPart("file")MultipartFile file) {
    log.info("Storing a new file. Recieved by Controller");
    this.storageService.store(file);
    return Mono.empty();
}

log.info（）方法不执行，因此似乎在执行方法之前抛出了错误 .

Error message

org.springframework.web.server.UnsupportedMediaTypeStatusException: Response status 415 with reason "Content type 'image/png' not supported"
at org.springframework.web.reactive.result.method.annotation.AbstractMessageReaderArgumentResolver.readBody(AbstractMessageReaderArgumentResolver.java:206) ~[spring-webflux-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.web.reactive.result.method.annotation.AbstractMessageReaderArgumentResolver.readBody(AbstractMessageReaderArgumentResolver.java:124) ~[spring-webflux-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.web.reactive.result.method.annotation.RequestPartMethodArgumentResolver.lambda$resolveArgument$0(RequestPartMethodArgumentResolver.java:99) ~[spring-webflux-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:118) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drainAsync(FluxFlattenIterable.java:391) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drain(FluxFlattenIterable.java:633) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.onNext(FluxFlattenIterable.java:238) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onNext(FluxFilterFuseable.java:87) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxReplay$SizeBoundReplayBuffer.replayFused(FluxReplay.java:865) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxReplay$SizeBoundReplayBuffer.replay(FluxReplay.java:895) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.ReplayProcessor.onNext(ReplayProcessor.java:436) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.MonoProcessor.drainLoop(MonoProcessor.java:504) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.MonoProcessor.onNext(MonoProcessor.java:347) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:115) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:450) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1069) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.MonoCollect$CollectSubscriber.onComplete(MonoCollect.java:142) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:460) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxCreate$BaseSink.complete(FluxCreate.java:404) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxCreate$BufferAsyncSink.drain(FluxCreate.java:712) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxCreate$BufferAsyncSink.complete(FluxCreate.java:666) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxCreate$SerializedSink.drainLoop(FluxCreate.java:221) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxCreate$SerializedSink.drain(FluxCreate.java:192) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at reactor.core.publisher.FluxCreate$SerializedSink.complete(FluxCreate.java:187) ~[reactor-core-3.1.5.RELEASE.jar:3.1.5.RELEASE]
at org.springframework.http.codec.multipart.SynchronossPartHttpMessageReader$FluxSinkAdapterListener.onAllPartsFinished(SynchronossPartHttpMessageReader.java:215) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.synchronoss.cloud.nio.multipart.NioMultipartParser.allPartsRead(NioMultipartParser.java:603) ~[nio-multipart-parser-1.1.0.jar:na]
at org.synchronoss.cloud.nio.multipart.NioMultipartParser.write(NioMultipartParser.java:449) ~[nio-multipart-parser-1.1.0.jar:na]
at org.synchronoss.cloud.nio.multipart.NioMultipartParser.write(NioMultipartParser.java:370) ~[nio-multipart-parser-1.1.0.jar:na]
at org.springframework.http.codec.multipart.SynchronossPartHttpMessageReader$SynchronossPartGenerator.lambda$accept$0(SynchronossPartHttpMessageReader.java:136) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]

依赖Spring Webflux应该使用org.synchronoss.cloud.nio.multipart加载，所以我不完全理解为什么Spring抛出415错误 .

我在Spring中使用WebClient创建了一个测试

WebTest

@Test
public void sendValidFileSaveCorrectly() {
    MockMultipartFile file = new MockMultipartFile("foo", "foo.txt",
            MediaType.TEXT_PLAIN_VALUE, "Hello World".getBytes());
    MultipartBodyBuilder builder = new MultipartBodyBuilder();
    builder.part("file", file);

    webClient.post()
            .uri("/api/file")
            .syncBody(builder.build())
            .exchange()
            .expectStatus().is2xxSuccessful();
}

我使用MockMultipartFile和此消息得到了新的500错误

I/O failure: org.springframework.core.codec.CodecException: Type definition error: [simple type, class java.io.ByteArrayInputStream]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class java.io.ByteArrayInputStream and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.mock.web.MockMultipartFile["inputStream"])

我想要了解的是为什么Spring会抛出一个不支持的媒体类型异常，以及我如何指示Spring Webflux忽略编写该响应的内容 .

Update

尝试更改控制器以使用@RequestParams和@RequestBody并获得相同的415错误 . 正在处理Multipart请求，但附加文件的Content-Type正在执行415 .

我继续向Controller添加了一个ExceptionHandler来尝试捕获UnsupportedMediaTypeStatusException . 我无法将文件传递给ExceptionHandler，所以这不起作用 . 我可以覆盖UnsupportedMediaTypeStatusException的默认ExceptionHandler，但我希望尽可能避免这种情况 .

如果它有用，我发布正在上传文件的Angular服务 . 但是因为即使在测试中也会出现错误，我认为Angular没有问题 .

upload.service.ts

post(file: File, fileName: string) {
const formData = new FormData();
formData.append('file', file, fileName);

let headers = new HttpHeaders();
headers = headers.delete('Content-Type');

this.http
  .post(this.API_URL, formData, { headers: headers, reportProgress: true })
  .subscribe();

}

2 回答

7

您必须使用Flux或Mono作为分段上传的类型 . https://github.com/hantsy/spring-reactive-sample/blob/master/multipart/src/main/java/com/example/demo/MultipartController.java

回复于 2024-04-29T22:48:56+08:00

请使用 @RequestPart("file") Mono<FilePart> file 或 @RequestPart("file") Flux<FilePart> 而不是 @RequestPart("file") MultipartFile file .

@PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public Mono<Void> save(@RequestPart("file") Mono<FilePart> file) {
        log.info("Storing a new file. Recieved by Controller");
        this.storageService.store(file);
        return Mono.empty();
    }

回复于 2024-04-29T22:48:56+08:00

带有MultipartFile的Spring Webflux 415

2 回答

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