Spring WebFlux:设置上传文件的最大文件大小

2022-01-09 00:00:00 file-upload upload spring java spring-webflux

我正在使用 FileParts 的 Flux 来上传文件 @RequestPart(FILES) Flux<FilePart>文件

I'm using flux of FileParts to upload files @RequestPart(FILES) Flux<FilePart> files

并试图限制文件的最大大小.看起来旧方法不起作用:

And trying to limit maximum size of files. Looks like old way does not work:

spring.servlet.multipart.max-file-size=1MB
spring.servlet.multipart.max-request-size=1MB

而且我没有任何方法可以在 FilePart 界面中获取文件大小.那么有什么方法可以限制 webflux 中上传文件的最大大小，而不复制它?我知道有像 Content-Length 这样的标头，但它看起来并不安全.

And I dont have any methods to get file size in FilePart interface. So is ther any way to limit max size of uploaded file in webflux, whithout copying it? I know that there are headers like Content-Length, but it does not look secure way.

推荐答案

Web on Reactive Stack 文档 声明如下:

对于写入磁盘的文件部分，有一个额外的 maxDiskUsagePerPart 属性来限制每个部分的磁盘空间量.还有一个 maxParts 属性来限制多部分请求中的部分总数.要在 WebFlux 中配置所有 3 个，您需要向 ServerCodecConfigurer 提供一个预配置的 MultipartHttpMessageReader 实例.

For file parts written to disk, there is an additional maxDiskUsagePerPart property to limit the amount of disk space per part. There is also a maxParts property to limit the overall number of parts in a multipart request. To configure all 3 in WebFlux, you’ll need to supply a pre-configured instance of MultipartHttpMessageReader to ServerCodecConfigurer.

我可以通过这个配置类来应用它:

I was able to apply it via this configuration class:

@Configuration
@EnableWebFlux
public class WebConfig implements WebFluxConfigurer {

    @Override
    public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
        SynchronossPartHttpMessageReader partReader = new SynchronossPartHttpMessageReader();
        partReader.setMaxParts(1);
        partReader.setMaxDiskUsagePerPart(10L * 1024L);
        partReader.setEnableLoggingRequestDetails(true);

        MultipartHttpMessageReader multipartReader = new MultipartHttpMessageReader(partReader);
        multipartReader.setEnableLoggingRequestDetails(true);

        configurer.defaultCodecs().multipartReader(multipartReader);
    }

}

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