Spring MVC使用AJAX一次上传多个文件不起作用 [英] Spring mvc upload multiple files at once with AJAX doesn't work

问题描述

我正在使用Spring boot 2.0.1，并且尝试使用dropzone上传多个文件。当我在 Dropzone.js 上使用 uploadMultiple：false 时，一切运行正常。当我设置 uploadMultiple：true 时，我的控制器停止工作。

I'm using Spring boot 2.0.1 and I'm trying to upload multiple files with dropzone. Everything is working perfectly when I'm using uploadMultiple: false on Dropzone.js. When I set uploadMultiple: true, My Controller stops working.

控制器类如下：

@PostMapping(value = "/img/upload")
public ResponseEntity<?> fileUpload(@RequestParam("file") MultipartFile[] files){

    System.out.println(files.length);
    for (MultipartFile file : files) {
        try {
            file.transferTo(new File("/opt/img/" + file.getOriginalFilename()));
            System.out.println(file.getOriginalFilename());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return new ResponseEntity<>("File Uploaded Successfully.", HttpStatus.OK);
}

文件大小不超过1MB，我的设置为

The files are no more than 1MB and my settings are

spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB

我上传文件时的请求标头：

My request header when I upload the files:

------WebKitFormBoundaryihPcX9WHR5UA9jGD
Content-Disposition: form-data; name="file[0]"; filename="cars-02-01.png"
Content-Type: image/png


------WebKitFormBoundaryihPcX9WHR5UA9jGD
Content-Disposition: form-data; name="file[1]"; filename="Screenshot from 2018-05-03 23-31-53.jpg"
Content-Type: image/jpeg

一切似乎都很完美。我仍然找不到导致此问题的原因？

Everything seems perfect. I still cannot find the reason for this problem?

推荐答案

似乎我应该使用 MultipartHttpServletRequest ，而不是 MultipartFile []文件。我将方法更改为：

It seems that I should use the MultipartHttpServletRequest instead of MultipartFile[] files. I Changed the method to:

@PostMapping(value = "/img/upload")
public ResponseEntity<?> fileUpload(MultipartHttpServletRequest request) {
    Map<String, MultipartFile> fileMap = request.getFileMap();

    for (MultipartFile file : fileMap.values()) {
        try {
            file.transferTo(new File("/opt/img/" + file.getOriginalFilename()));
            System.out.println(file.getOriginalFilename());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return new ResponseEntity<>("File Uploaded Successfully.", HttpStatus.OK);
}

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