我知道这是一个非常普遍的问题,但我在Angular 2中上传文件失败了。 我试过了
1) http://valor-software.com/ng2-file-upload/
2) http://ng2-uploader.com/home
...但失败了。有人在Angular中上传过文件吗?你用了什么方法?怎么做呢?如果提供了任何示例代码或演示链接,将非常感谢。
我知道这是一个非常普遍的问题,但我在Angular 2中上传文件失败了。 我试过了
1) http://valor-software.com/ng2-file-upload/
2) http://ng2-uploader.com/home
...但失败了。有人在Angular中上传过文件吗?你用了什么方法?怎么做呢?如果提供了任何示例代码或演示链接,将非常感谢。
当前回答
感谢@Eswar。这段代码非常适合我。我想在解决方案中添加一些东西:
我得到错误:java.io.IOException: RESTEASY007550:无法获得多部分的边界
为了解决这个错误,你应该删除“Content-Type”“multipart/form-data”。它解决了我的问题。
其他回答
我已经成功地使用了下面的工具。我和primeNg没有利害关系,只是传递我的建议。
http://www.primefaces.org/primeng/#/fileupload
感谢@Eswar。这段代码非常适合我。我想在解决方案中添加一些东西:
我得到错误:java.io.IOException: RESTEASY007550:无法获得多部分的边界
为了解决这个错误,你应该删除“Content-Type”“multipart/form-data”。它解决了我的问题。
根据上面的答案,我用Angular 5.x构建了这个
只需调用uploadFile(url, file).subscribe()来触发上传
import { Injectable } from '@angular/core';
import {HttpClient, HttpParams, HttpRequest, HttpEvent} from '@angular/common/http';
import {Observable} from "rxjs";
@Injectable()
export class UploadService {
constructor(private http: HttpClient) { }
// file from event.target.files[0]
uploadFile(url: string, file: File): Observable<HttpEvent<any>> {
let formData = new FormData();
formData.append('upload', file);
let params = new HttpParams();
const options = {
params: params,
reportProgress: true,
};
const req = new HttpRequest('POST', url, formData, options);
return this.http.request(req);
}
}
在组件中像这样使用它
// At the drag drop area
// (drop)="onDropFile($event)"
onDropFile(event: DragEvent) {
event.preventDefault();
this.uploadFile(event.dataTransfer.files);
}
// At the drag drop area
// (dragover)="onDragOverFile($event)"
onDragOverFile(event) {
event.stopPropagation();
event.preventDefault();
}
// At the file input element
// (change)="selectFile($event)"
selectFile(event) {
this.uploadFile(event.target.files);
}
uploadFile(files: FileList) {
if (files.length == 0) {
console.log("No file selected!");
return
}
let file: File = files[0];
this.upload.uploadFile(this.appCfg.baseUrl + "/api/flash/upload", file)
.subscribe(
event => {
if (event.type == HttpEventType.UploadProgress) {
const percentDone = Math.round(100 * event.loaded / event.total);
console.log(`File is ${percentDone}% loaded.`);
} else if (event instanceof HttpResponse) {
console.log('File is completely loaded!');
}
},
(err) => {
console.log("Upload Error:", err);
}, () => {
console.log("Upload done");
}
)
}
上传带有表单字段的图像
SaveFileWithData(article: ArticleModel,picture:File): Observable<ArticleModel>
{
let headers = new Headers();
// headers.append('Content-Type', 'multipart/form-data');
// headers.append('Accept', 'application/json');
let requestoptions = new RequestOptions({
method: RequestMethod.Post,
headers:headers
});
let formData: FormData = new FormData();
if (picture != null || picture != undefined) {
formData.append('files', picture, picture.name);
}
formData.append("article",JSON.stringify(article));
return this.http.post("url",formData,requestoptions)
.map((response: Response) => response.json() as ArticleModel);
}
在我的情况下,我需要。net Web Api在c#
// POST: api/Articles
[ResponseType(typeof(Article))]
public async Task<IHttpActionResult> PostArticle()
{
Article article = null;
try
{
HttpPostedFile postedFile = null;
var httpRequest = HttpContext.Current.Request;
if (httpRequest.Files.Count == 1)
{
postedFile = httpRequest.Files[0];
var filePath = HttpContext.Current.Server.MapPath("~/" + postedFile.FileName);
postedFile.SaveAs(filePath);
}
var json = httpRequest.Form["article"];
article = JsonConvert.DeserializeObject <Article>(json);
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
article.CreatedDate = DateTime.Now;
article.CreatedBy = "Abbas";
db.articles.Add(article);
await db.SaveChangesAsync();
}
catch (Exception ex)
{
int a = 0;
}
return CreatedAtRoute("DefaultApi", new { id = article.Id }, article);
}
我已经上传文件使用引用。以这种方式上传文件不需要包。
//要写入.ts文件的代码
@ViewChild("fileInput") fileInput;
addFile(): void {
let fi = this.fileInput.nativeElement;
if (fi.files && fi.files[0]) {
let fileToUpload = fi.files[0];
this.admin.addQuestionApi(fileToUpload)
.subscribe(
success => {
this.loading = false;
this.flashMessagesService.show('Uploaded successfully', {
classes: ['alert', 'alert-success'],
timeout: 1000,
});
},
error => {
this.loading = false;
if(error.statusCode==401) this.router.navigate(['']);
else
this.flashMessagesService.show(error.message, {
classes: ['alert', 'alert-danger'],
timeout: 1000,
});
});
}
}
//服务中要编写的代码。ts文件
addQuestionApi(fileToUpload: any){
var headers = this.getHeadersForMultipart();
let input = new FormData();
input.append("file", fileToUpload);
return this.http.post(this.baseUrl+'addQuestions', input, {headers:headers})
.map(response => response.json())
.catch(this.errorHandler);
}
//用HTML编写的代码
<input type="file" #fileInput>