我是Angular的初学者,我想知道如何创建Angular 5文件上传部分,我试图找到任何教程或文档,但我在任何地方都看不到任何东西。对此有什么想法吗?我尝试了ng4-files,但它不适用于Angular 5


当前回答

试试这个

安装

npm install primeng --save

进口

import {FileUploadModule} from 'primeng/primeng';

Html

<p-fileUpload name="myfile[]" url="./upload.php" multiple="multiple"
    accept="image/*" auto="auto"></p-fileUpload>

其他回答

通过这种方式,我实现了在项目中上传文件到web API。

我为谁分担关心。

const formData: FormData = new FormData();
formData.append('Image', image, image.name);
formData.append('ComponentId', componentId);
return this.http.post('/api/dashboard/UploadImage', formData);

一步一步

ASP。网上广告

[HttpPost]
[Route("api/dashboard/UploadImage")]
public HttpResponseMessage UploadImage() 
{
    string imageName = null;
    var httpRequest = HttpContext.Current.Request;
    //Upload Image
    var postedFile = httpRequest.Files["Image"];
    //Create custom filename
    if (postedFile != null)
    {
        imageName = new String(Path.GetFileNameWithoutExtension(postedFile.FileName).Take(10).ToArray()).Replace(" ", "-");
        imageName = imageName + DateTime.Now.ToString("yymmssfff") + Path.GetExtension(postedFile.FileName);
        var filePath = HttpContext.Current.Server.MapPath("~/Images/" + imageName);
        postedFile.SaveAs(filePath);
    }
}

HTML表单

<form #imageForm=ngForm (ngSubmit)="OnSubmit(Image)">

    <img [src]="imageUrl" class="imgArea">
    <div class="image-upload">
        <label for="file-input">
            <img src="upload.jpg" />
        </label>

        <input id="file-input" #Image type="file" (change)="handleFileInput($event.target.files)" />
        <button type="submit" class="btn-large btn-submit" [disabled]="Image.value=='' || !imageForm.valid"><i
                class="material-icons">save</i></button>
    </div>
</form>

TS文件使用API

OnSubmit(Image) {
    this.dashboardService.uploadImage(this.componentId, this.fileToUpload).subscribe(
      data => {
        console.log('done');
        Image.value = null;
        this.imageUrl = "/assets/img/logo.png";
      }
    );
  }

服务TS

uploadImage(componentId, image) {
        const formData: FormData = new FormData();
        formData.append('Image', image, image.name);
        formData.append('ComponentId', componentId);
        return this.http.post('/api/dashboard/UploadImage', formData);
    }

我使用的是Angular 5.2.11, 我喜欢Gregor Doroschenko提供的解决方案,但是我注意到上传的文件是零字节的,我必须做一个小小的改变才能让它为我工作。

postFile(fileToUpload: File): Observable<boolean> {
  const endpoint = 'your-destination-url';
  return this.httpClient
    .post(endpoint, fileToUpload, { headers: yourHeadersConfig })
    .map(() => { return true; })
    .catch((e) => this.handleError(e));
}

下面几行(formData)对我不起作用。

const formData: FormData = new FormData();
formData.append('fileKey', fileToUpload, fileToUpload.name);

https://github.com/amitrke/ngrke/blob/master/src/app/services/fileupload.service.ts

create-profile.html

<body>
  <h1 class="font-weight-bold" >Create Advertistment</h1>
  <hr />
  <form [formGroup]="form" (submit)="onSubmit()">
    <div>
      <label class="font-weight-bold">Insert Subject name</label>
      <br>
      <input formControlName="name" type="text" placeholder="Enter name..." />
    </div>
    <div>
      <br>
      <label class="font-weight-bold">Select the Advertistment</label>
      <br>
      <input (change)="onFileSelect($event)" type="file" />
    </div>
    <br>
    <!--<div *ngIf="imageData">
      <img [src]="imageData" [alt]="form.value.name" />
    </div>-->
    <div>

      <label class="font-weight-bold">Upload the Advertistment</label>
      <br>
      <button type="submit" class="btn btn-success" >Upload Advertistment</button>
    </div>
  </form>

  </body>

create-profile.ts

import { Component, OnInit } from "@angular/core";
import { FormGroup, FormControl } from "@angular/forms";

import { Profile } from "../../models/Profile";
import { ProfileService } from "src/app/services/profile.service";

@Component({
  selector: "app-create-profile",
  templateUrl: "./create-profile.component.html",
  styleUrls: ["./create-profile.component.css"],
})
export class CreateProfileComponent implements OnInit {
  form: FormGroup;
  profile: Profile;
  imageData: string;

  constructor(private profileService: ProfileService) {}

  ngOnInit(): void {
    this.form = new FormGroup({
      name: new FormControl(null),
      image: new FormControl(null),
    });
  }

  onFileSelect(event: Event) {
    const file = (event.target as HTMLInputElement).files[0];
    this.form.patchValue({ image: file });
    const allowedMimeTypes = ["image/png", "image/jpeg", "image/jpg"];
    if (file && allowedMimeTypes.includes(file.type)) {
      const reader = new FileReader();
      reader.onload = () => {
        this.imageData = reader.result as string;
      };
      reader.readAsDataURL(file);
    }
  }

  onSubmit() {
    this.profileService.addProfile(this.form.value.name, this.form.value.image);
    this.form.reset();
    this.imageData = null;
  }
}

profile.service.ts

import { Injectable } from "@angular/core";
import { HttpClient } from "@angular/common/http";

import { map } from "rxjs/operators";

import { Profile } from "../models/Profile";
import { Subject } from "rxjs";

@Injectable({
  providedIn: "root",
})
export class ProfileService {
  private profiles: Profile[] = [];
  private profiles$ = new Subject<Profile[]>();
  readonly url = "http://localhost:3000/api/profiles";

  constructor(private http: HttpClient) {}

  getProfiles() {
    this.http
      .get<{ profiles: Profile[] }>(this.url)
      .pipe(
        map((profileData) => {
          return profileData.profiles;
        })
      )
      .subscribe((profiles) => {
        this.profiles = profiles;
        this.profiles$.next(this.profiles);
      });
  }

  getProfilesStream() {
    return this.profiles$.asObservable();
  }

  addProfile(name: string, image: File): void {
    const profileData = new FormData();
    profileData.append("name", name);
    profileData.append("image", image, name);
    this.http
      .post<{ profile: Profile }>(this.url, profileData)
      .subscribe((profileData) => {
        const profile: Profile = {
          _id: profileData.profile._id,
          name: name,
          imagePath: profileData.profile.imagePath,
        };
        this.profiles.push(profile);
        this.profiles$.next(this.profiles);
      });
  }
}

Profile.ts

export interface Profile {
  _id: string;
  name: string;
  imagePath: string;
}

在我的情况下,我使用http拦截器,事情是,默认情况下,我的http拦截器设置内容类型头为应用程序/json,但对于文件上传,我使用multer库。 稍微改变一下我的http。interceptor定义,如果请求体是FormData,它会删除头,不触及访问令牌。 下面是一部分代码,它让我很开心。

if (request.body instanceof FormData) {
  request = request.clone({ headers: request.headers.delete('Content-Type', 'application/json') });
}

if (request.body instanceof FormData) {
  request = request.clone({ headers: request.headers.delete('Accept', 'application/json')});
}

超文本标记语言


    <div class="form-group">
      <label for="file">Choose File</label><br /> <input type="file" id="file" (change)="uploadFiles($event.target.files)">
    </div>

    <button type="button" (click)="RequestUpload()">Ok</button>

ts文件

public formData = new FormData();
ReqJson: any = {};

uploadFiles( file ) {
        console.log( 'file', file )
        for ( let i = 0; i < file.length; i++ ) {
            this.formData.append( "file", file[i], file[i]['name'] );
        }
    }

RequestUpload() {
        this.ReqJson["patientId"] = "12"
        this.ReqJson["requesterName"] = "test1"
        this.ReqJson["requestDate"] = "1/1/2019"
        this.ReqJson["location"] = "INDIA"
        this.formData.append( 'Info', JSON.stringify( this.ReqJson ) )
            this.http.post( '/Request', this.formData )
                .subscribe(( ) => {                 
                });     
    }

后端Spring(java文件)


import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class Request {
    private static String UPLOADED_FOLDER = "c://temp//";

    @PostMapping("/Request")
    @ResponseBody
    public String uploadFile(@RequestParam("file") MultipartFile file, @RequestParam("Info") String Info) {
        System.out.println("Json is" + Info);
        if (file.isEmpty()) {
            return "No file attached";
        }
        try {
            // Get the file and save it somewhere
            byte[] bytes = file.getBytes();
            Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename());
            Files.write(path, bytes);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "Succuss";
    }
}

我们必须在C驱动器中创建一个文件夹“temp”,然后这段代码将在控制台中打印Json并将上传的文件保存在创建的文件夹中