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问题描述

我正在创建一个angular2项目,其中我的要求是上传文件并将一些参数从客户端发送到服务器(Spring Rest Server)。
我已经尝试了Formdata接口,但是当我追加一个文件(从Event.srcElement.files创建的文件对象)到它,然后记录对象到控制台打印一个空的formdata对象。
至于服务器端我使用@requestparam(文件)来获取文件。
如果有人可以提供一些帮助,这将是非常好的。



这是我的HTML文件中的代码

 < input type =file#uploadFile multiple =true(change)=uploadFile($ event)/> 

组件文件就像这样

  uploadFile(event:any){
let file = event.target.files [0];
让fileName = file.name;
console.log(file)
console.log(fileName)
let formData = new FormData();
formData.append('file',file);
this.examService.uploadAnswer(formData);

$ / code>

和服务档案

  uploadAnswer(formData:FormData){
console.log(formData)
this.http.post(this.url +'/ uploadanswer',formData)
.map((response:Response)=> {
let res = response.json();
Object.keys(res).forEach(name =>
this .questions = res [name]
);
});


解决方案

您的HTML应该是:

 < input id =file-fieldname =file-field(change)=uploadFile($ event)type =file accept =。png,.jpg,.jpeg> 

所以你会得到文件在组件:

  uploadFile(event){
let files = event.target.files;
if(files.length> 0){
console.log(file); //你会看到文件
this.service.uploadFile(file);


$ / code $ / pre

在服务中:

  uploadFile(file){
let formData:FormData = new FormData();
formData.append('file',file,file.name);
$ b $ this.http.post(url,formData,request_options)
}

然后,您将获得请求数据中的文件密钥文件。


I am creating an angular2 project, in which my requirement is to upload a file and send some parameters from client to server(Spring Rest Server).I have tried Formdata Interface, but when i am appending a file(File Object created from event.srcElement.files) to it and then logging the object to console it prints an empty formdata object.As for the server side i am using @requestparam("file") to fetch the file.It would be great if anyone can provide some help on this.

this is the code in my html file

<input type="file" #uploadFile multiple="true" (change)="uploadFile($event)"/>

component file is like this

  uploadFile(event:any){
    let file = event.target.files[0];
    let fileName = file.name;
    console.log(file)
    console.log(fileName)
    let formData = new FormData();
    formData.append('file',file);
    this.examService.uploadAnswer(formData);
}

and in service file

uploadAnswer(formData:FormData){
            console.log(formData)
            this.http.post(this.url+'/uploadanswer', formData)
            .map((response: Response) => {
                let res = response.json();
            Object.keys(res).forEach(name =>
                this.questions=res[name]
            );
            });
解决方案

Your HTML should be:

<input id="file-field" name="file-field" (change)="uploadFile($event)" type="file" accept=".png,.jpg,.jpeg">

So you will get file in component as:

uploadFile(event) {
  let files = event.target.files;
  if (files.length > 0) {
    console.log(file); // You will see the file
    this.service.uploadFile(file);
  }
}

And in service:

uploadFile(file) {
  let formData: FormData = new FormData();
  formData.append('file', file, file.name);

  this.http.post(url, formData, request_options)
}

Then you will get file in with file key in request data.

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08-18 10:05