在Angular 2和Spring MVC中上载具有其他表单字段的文件 [英] Uploading file with other form fields in Angular 2 and Spring MVC

问题描述

我正在尝试从Angular 2前端到Spring后端上传文件和其他表单字段内容.但是不知何故我做不到.这是我的代码:

I am trying to upload file and other form field contents from my Angular 2 front end to Spring back end. But somehow I am not able to do it. Here is my code:

app.component.ts

fileChange(e){
    this.fileList = e.target.files;
  }

uploadPdf(){
    if(this.fileList.length>0){
      let file: File = this.fileList[0];
      let formData:FormData = new FormData();

      formData.append('uploadFile', file, file.name);
      formData.append('info',this.model);

      console.log(file.size);

      let headers = new Headers();
      headers.append('Accept', 'application/json');
      let options = new RequestOptions({ headers: headers });
      this.http.post(this.url,formData, options)
        /*.map((res: Response) => res.json())*/
        .catch(error => Observable.throw(error))
        .subscribe(
          data =>{
            this.data = data;
            console.log(this.data);
          }
          ,
          error => console.log(error)
        )
    }
  }

app.cmoponent.html

<h1 class="text-center">
  PDF Viewer and Uploader Example
</h1>
<div class="text-center">
  <form enctype="multipart/form-data">
    <div class="form-group">
      <label for="name">Name: </label>
      <input type="text" id="name" class="form-control" name="name" [(ngModel)]="model.name">
    </div>
    <div class="form-group">
      <label for="email">Email: </label>
      <input type="email" id="email" class="form-control" name="email" [(ngModel)]="model.email">
    </div>
    <div class="form-group">
      <label for="pdfInput">Select File: </label>
      <input type="file" id="pdfInput" class="form-control" name="pdfInput" (change)="fileChange($event)">
    </div>
    <div class="form-group">
      <button type="button" class="btn btn-success" (click)="uploadPdf()">Upload File!</button><span>   </span>
      <button type="button" class="btn btn-success" (click)="printData()">Print to Console!</button>
    </div>
  </form>
</div>

model.ts

export class Model{

  name: string;
  email: string;

}

现在在后端:

ExampleModel.java

public class ExampleModel {

private String name;
private String email;
//Getters and Setters

MainController.java

@RequestMapping(value = "/file",method = RequestMethod.POST)
    @ResponseBody
    public ResponseEntity<String> addUser(@RequestParam("uploadFile") MultipartFile file, @RequestParam("info") ExampleModel model){}

那么，如何在spring控制器中获取带有info标签的数据?上面我已经展示了我的错误尝试，那么获取其他表单字段数据的正确方法是什么?

So, how to get that info labeled data in the spring controller? Above I have shown my attempt which is wrong so, what is the correct approach to get other form fields data?

应该如何定义带批注的Controller方法，或者还有其他方法可以从Angular 2发送数据(文件+表单字段)?

How the Controller method with annotations should be defined or is there other way to send data(both file + form fields) from Angular 2?

推荐答案

您需要使用@RequestPart而不是@RequestParam并设置consumes属性:

You need to use @RequestPart instead of @RequestParam and set consumes attribute:

@RequestMapping(value = "/file",method = RequestMethod.POST, consumes = "multipart/form-data")
@ResponseBody
public ResponseEntity<String> addUser(@RequestPart("uploadFile") MultipartFile file, @RequestPart("info") ExampleModel model){}

您还需要调整FormData对象:

formData.append('uploadFile', file, file.name);
formData.append('info', new Blob([JSON.stringify(this.model)],
        {
            type: "application/json"
        }));

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