如何使用Webflux上传多个文件?
我发送内容类型为multipart/form-data
的请求,并且正文包含一个 part ,该值是一组文件。
要处理单个文件,请按以下步骤操作:
Mono<MultiValueMap<String, Part> body = request.body(toMultipartData());
body.flatMap(map -> FilePart part = (FilePart) map.toSingleValueMap().get("file"));
但是如何对多个文件执行此操作?
PS。还有另一种方法可以在webflux中上传一组文件吗?
答案 0 :(得分:5)
您可以使用Flux迭代哈希图并返回Flux
Flux.fromIterable(hashMap.entrySet())
.map(o -> hashmap.get(o));
,它将与filepart一起作为数组发送
答案 1 :(得分:1)
我已经找到了一些解决方案。 假设我们发送带有参数 files 的http POST请求,其中包含我们的文件。
注释响应是任意的
带有RequestPart的RestController
@PostMapping("/upload")
public Mono<String> process(@RequestPart("files") Flux<FilePart> filePartFlux) {
return filePartFlux.flatMap(it -> it.transferTo(Paths.get("/tmp/" + it.filename())))
.then(Mono.just("OK"));
}
具有ModelAttribute的RestController
@PostMapping("/upload-model")
public Mono<String> processModel(@ModelAttribute Model model) {
model.files.forEach(it -> it.transferTo(Paths.get("/tmp/" + it.filename())));
return Mono.just("OK");
}
class Model {
private List<FilePart> files;
//getters and setters
}
使用HandlerFunction的功能方式
public Mono<ServerResponse> upload(ServerRequest request) {
Mono<String> then = request.multipartData().map(it -> it.get("files"))
.flatMapMany(Flux::fromIterable)
.cast(FilePart.class)
.flatMap(it -> it.transferTo(Paths.get("/tmp/" + it.filename())))
.then(Mono.just("OK"));
return ServerResponse.ok().body(then, String.class);
}
答案 2 :(得分:0)
键是使用 toParts 而不是 toMultipartData ,这更简单。这是与 RouterFunctions 一起使用的示例。
private Mono<ServerResponse> working2(final ServerRequest request) {
final Flux<Void> voidFlux = request.body(BodyExtractors.toParts())
.cast(FilePart.class)
.flatMap(filePart -> {
final String extension = FilenameUtils.getExtension(filePart.filename());
final String baseName = FilenameUtils.getBaseName(filePart.filename());
final String format = LocalDateTime.now().format(DateTimeFormatter.BASIC_ISO_DATE);
final Path path = Path.of("/tmp", String.format("%s-%s.%s", baseName, format, extension));
return filePart.transferTo(path);
});
return ServerResponse
.ok()
.contentType(APPLICATION_JSON_UTF8)
.body(voidFlux, Void.class);
}
答案 3 :(得分:0)
希望对你有帮助
@PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public JSON fileUpload(@RequestPart FilePart file)throws Exception{
OSS ossClient = new OSSClientBuilder().build(APPConfig.ENDPOINT, APPConfig.ALI_ACCESSKEYID, APPConfig.ALI_ACCESSSECRET);
File f = null;
String url;
try {
String suffix = file.filename();
String fileName = "images/" + file.filename();
Path path = Files.createTempFile("tempimg", suffix.substring(1, suffix.length()));
file.transferTo(path);
f = path.toFile();
ossClient.putObject(APPConfig.BUCKETNAME, fileName, new FileInputStream(f));
Date expiration = new Date(System.currentTimeMillis() + 3600L * 1000 * 24 * 365 * 10);
url = ossClient.generatePresignedUrl(APPConfig.BUCKETNAME, fileName, expiration).toString();
}finally {
f.delete();
ossClient.shutdown();
}
return JSONUtils.successResposeData(url);
}
答案 4 :(得分:-1)
以下是使用WebFlux上传多个文件的工作代码。
@RequestMapping(value = "upload", method = RequestMethod.POST)
Mono<Object> upload(@RequestBody Flux<Part> parts) {
return parts.log().collectList().map(mparts -> {
return mparts.stream().map(mmp -> {
if (mmp instanceof FilePart) {
FilePart fp = (FilePart) mmp;
fp.transferTo(new File("c:/hello/"+fp.filename()));
} else {
// process the other non file parts
}
return mmp instanceof FilePart ? mmp.name() + ":" + ((FilePart) mmp).filename() : mmp.name();
}).collect(Collectors.joining(",", "[", "]"));
});
};