Java 您将如何通过Http发布多部分文件？

我正在尝试用Java/springboot/Vaadin构建一个文件上传程序

那个上传者给了我一个记忆缓冲。如何将其发布到我的后端，如下所示：

@RestController
@RequestMapping("files")
public class FilesController {
...
    @PostMapping
    public ResponseEntity<String> upload(@RequestParam("file") MultipartFile file) {
        try {
            fileService.save(file);
            return ResponseEntity.status(HttpStatus.OK)
                    .body(String.format("File uploaded successfully: %s", file.getOriginalFilename()));
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                    .body(String.format("Could not upload the file: %s!", file.getOriginalFilename()));
        }
    }
...

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但是我不知道如何添加请求的多部分文件。谢谢：）

我还没有测试过这段代码，所以它可能有效，也可能无效。它是基于a和JavaDoc的

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我还没有测试过这段代码，所以它可能有效，也可能无效。它是基于a和JavaDoc的

        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httppost = new HttpPost("http://localhost:9091/upload/files");

        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();

FileData fileData = memoryBuffer.getFileData();

MultipartEntityBuilder builder = MultipartEntityBuilder.create();         
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
builder.addBinaryBody("blabla", fileData.getFile(), 
    ContentType.create(fileData.getMimeType()), 
    fileData.getFileName());
HttpEntity entity = builder.build();
httppost.setEntity(entity);