所需的请求部分'文件'不存在 - Angular2 Post请求

Question

我试图使用Angular2和SpringBoot完成我的文件上传功能.我可以证明我的文件上传的java代码工作正常,因为我已经使用Postman成功测试了它.

但是,当从Angular2前端发送文件时,我收到HTTP 400响应说Required request part 'file' is not present.

这是我从Angular2发送POST请求的方式.

savePhoto(photoToSave: File) {

    let formData: FormData = new FormData();
    formData.append('file', photoToSave);

    // this will be used to add headers to the requests conditionally later using Custom Request Options
    this._globals.setRequestFrom("save-photo");


    let savedPath = this._http
        .post(this._endpointUrl + "save-photo", formData)
        .map(
        res => {
            return res.json();
        }
        )
        .catch(handleError);

    return savedPath;

}

请注意,我编写了一个CustomRequestOptions扩展的类,BaseRequestOptions以便附加Authorization标头和Content Type标头.内容类型标题将有条件地添加.

以下是代码.

@Injectable()
export class CustomRequestOptions extends BaseRequestOptions {
    constructor(private _globals: Globals) {
        super();

        this.headers.set('X-Requested-By', 'Angular 2');
        this.headers.append('virglk', "vigamage");
    }

    merge(options?: RequestOptionsArgs): RequestOptions {

        var newOptions = super.merge(options);

        let hdr = this._globals.getAuthorization();
        newOptions.headers.set("Authorization", hdr);

        if(this._globals.getRequestFrom() != "save-photo"){
            newOptions.headers.set('Content-Type', 'application/json');
        }else{
            //request coming from save photo
            console.log("request coming from save photo");
        }

        return newOptions;
    }

}

此条件标头附加工作正常.这样做的目的是如果我'Content-Type', 'application/json'为每个请求添加标头,Spring控制器中的文件上传方法将不接受它.(返回http 415)

一切似乎都很好.但我收到Required request part 'file' is not present错误回复.这是为什么？我将该参数添加到数据表格中.

let formData: FormData = new FormData();
formData.append('file', photoToSave);

这是Spring Controller方法供您参考.

@RequestMapping(method = RequestMethod.POST, value = "/tender/save-new/save-photo", consumes = {"multipart/form-data"})
public ResponseEntity<?> uploadPhoto(@RequestParam("file") MultipartFile file){

    if (file.isEmpty()) {
        ErrorResponse errorResponse = new ErrorResponse();
        errorResponse.setMessage("DEBUG: Attached file is empty");
        return new ResponseEntity<ErrorResponse>(errorResponse, HttpStatus.NOT_FOUND);
    }
    String returnPath = null;
    try {
        // upload stuff
    } catch (IOException e) {
        ErrorResponse errorResponse = new ErrorResponse();
        errorResponse.setMessage(e.getMessage());
        return new ResponseEntity<ErrorResponse> (errorResponse, HttpStatus.INTERNAL_SERVER_ERROR);
    }

    return new ResponseEntity<String>(returnPath, HttpStatus.OK);
}

编辑 - 添加浏览器捕获的请求的有效负载

如您所见,那里有param"file".

Answer 1

尝试添加

headers: {
            'Content-Type': 'multipart/form-data'
        },

给你的

.post(this._endpointUrl + "save-photo", formData)