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
非常简单和最快的方法是使用ng2-file-upload。
通过npm安装ng2-file-upload。NPM I ng2-file-upload——保存
首先在模块中导入模块。
import { FileUploadModule } from 'ng2-file-upload';
Add it to [imports] under @NgModule:
imports: [ ... FileUploadModule, ... ]
标记:
<input ng2FileSelect type="file" accept=".xml" [uploader]="uploader"/>
在你的组件中:
import { FileUploader } from 'ng2-file-upload';
...
uploader: FileUploader = new FileUploader({ url: "api/your_upload", removeAfterUpload: false, autoUpload: true });
这是最简单的用法。要知道所有的权力,这看到演示
其他回答
在Angular 7/8/9中
来源链接
使用自举表单
<form>
<div class="form-group">
<fieldset class="form-group">
<label>Upload Logo</label>
{{imageError}}
<div class="custom-file fileInputProfileWrap">
<input type="file" (change)="fileChangeEvent($event)" class="fileInputProfile">
<div class="img-space">
<ng-container *ngIf="isImageSaved; else elseTemplate">
<img [src]="cardImageBase64" />
</ng-container>
<ng-template #elseTemplate>
<img src="./../../assets/placeholder.png" class="img-responsive">
</ng-template>
</div>
</div>
</fieldset>
</div>
<a class="btn btn-danger" (click)="removeImage()" *ngIf="isImageSaved">Remove</a>
</form>
在组件类中
fileChangeEvent(fileInput: any) {
this.imageError = null;
if (fileInput.target.files && fileInput.target.files[0]) {
// Size Filter Bytes
const max_size = 20971520;
const allowed_types = ['image/png', 'image/jpeg'];
const max_height = 15200;
const max_width = 25600;
if (fileInput.target.files[0].size > max_size) {
this.imageError =
'Maximum size allowed is ' + max_size / 1000 + 'Mb';
return false;
}
if (!_.includes(allowed_types, fileInput.target.files[0].type)) {
this.imageError = 'Only Images are allowed ( JPG | PNG )';
return false;
}
const reader = new FileReader();
reader.onload = (e: any) => {
const image = new Image();
image.src = e.target.result;
image.onload = rs => {
const img_height = rs.currentTarget['height'];
const img_width = rs.currentTarget['width'];
console.log(img_height, img_width);
if (img_height > max_height && img_width > max_width) {
this.imageError =
'Maximum dimentions allowed ' +
max_height +
'*' +
max_width +
'px';
return false;
} else {
const imgBase64Path = e.target.result;
this.cardImageBase64 = imgBase64Path;
this.isImageSaved = true;
// this.previewImagePath = imgBase64Path;
}
};
};
reader.readAsDataURL(fileInput.target.files[0]);
}
}
removeImage() {
this.cardImageBase64 = null;
this.isImageSaved = false;
}
好的,因为这个线程出现在谷歌的第一个结果中,对于其他有同样问题的用户,你不需要像trueboroda指出的那样重新开始,有ng2-file-upload库,它简化了使用angular 6和7上传文件的过程,你所需要做的是:
安装最新的Angular CLI
yarn add global @angular/cli
出于兼容性考虑,请安装rx-compat
npm install rxjs-compat --save
安装ng2-file-upload
npm install ng2-file-upload --save
在你的模块中导入FileSelectDirective指令。
import { FileSelectDirective } from 'ng2-file-upload';
Add it to [declarations] under @NgModule:
declarations: [ ... FileSelectDirective , ... ]
在你的组件中
import { FileUploader } from 'ng2-file-upload/ng2-file-upload';
...
export class AppComponent implements OnInit {
public uploader: FileUploader = new FileUploader({url: URL, itemAlias: 'photo'});
}
模板
<input type="file" name="photo" ng2FileSelect [uploader]="uploader" />
为了更好地理解,你可以查看这个链接: 如何使用Angular 6/7上传文件
就我个人而言,我使用ngx-material-file-input作为前端,Firebase作为后端。更准确地说,后端是与Cloud Firestore结合的Cloud Storage for Firebase。下面是一个示例,它限制文件不大于20 MB,并且只接受某些文件扩展名。我还使用Cloud Firestore来存储上传文件的链接,但你可以跳过这个。
contact.component.html
<mat-form-field>
<!--
Accept only files in the following format: .doc, .docx, .jpg, .jpeg, .pdf, .png, .xls, .xlsx. However, this is easy to bypass, Cloud Storage rules has been set up on the back-end side.
-->
<ngx-mat-file-input
[accept]="[
'.doc',
'.docx',
'.jpg',
'.jpeg',
'.pdf',
'.png',
'.xls',
'.xlsx'
]"
(change)="uploadFile($event)"
formControlName="fileUploader"
multiple
aria-label="Here you can add additional files about your project, which can be helpeful for us."
placeholder="Additional files"
title="Additional files"
type="file"
>
</ngx-mat-file-input>
<mat-icon matSuffix>folder</mat-icon>
<mat-hint
>Accepted formats: DOC, DOCX, JPG, JPEG, PDF, PNG, XLS and XLSX,
maximum files upload size: 20 MB.
</mat-hint>
<!--
Non-null assertion operators are required to let know the compiler that this value is not empty and exists.
-->
<mat-error
*ngIf="contactForm.get('fileUploader')!.hasError('maxContentSize')"
>
This size is too large,
<strong
>maximum acceptable upload size is
{{
contactForm.get('fileUploader')?.getError('maxContentSize')
.maxSize | byteFormat
}}</strong
>
(uploaded size:
{{
contactForm.get('fileUploader')?.getError('maxContentSize')
.actualSize | byteFormat
}}).
</mat-error>
</mat-form-field>
ts(大小验证器部分)
import { FileValidator } from 'ngx-material-file-input';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
/**
* @constructor
* @description Creates a new instance of this component.
* @param {formBuilder} - an abstraction class object to create a form group control for the contact form.
*/
constructor(
private angularFirestore: AngularFirestore,
private angularFireStorage: AngularFireStorage,
private formBuilder: FormBuilder
) {}
public maxFileSize = 20971520;
public contactForm: FormGroup = this.formBuilder.group({
fileUploader: [
'',
Validators.compose([
FileValidator.maxContentSize(this.maxFileSize),
Validators.maxLength(512),
Validators.minLength(2)
])
]
})
ts(文件上传器部分)
import { AngularFirestore } from '@angular/fire/firestore';
import {
AngularFireStorage,
AngularFireStorageReference,
AngularFireUploadTask
} from '@angular/fire/storage';
import { catchError, finalize } from 'rxjs/operators';
import { throwError } from 'rxjs';
public downloadURL: string[] = [];
/**
* @description Upload additional files to Cloud Firestore and get URL to the files.
* @param {event} - object of sent files.
* @returns {void}
*/
public uploadFile(event: any): void {
// Iterate through all uploaded files.
for (let i = 0; i < event.target.files.length; i++) {
const randomId = Math.random()
.toString(36)
.substring(2); // Create random ID, so the same file names can be uploaded to Cloud Firestore.
const file = event.target.files[i]; // Get each uploaded file.
// Get file reference.
const fileRef: AngularFireStorageReference = this.angularFireStorage.ref(
randomId
);
// Create upload task.
const task: AngularFireUploadTask = this.angularFireStorage.upload(
randomId,
file
);
// Upload file to Cloud Firestore.
task
.snapshotChanges()
.pipe(
finalize(() => {
fileRef.getDownloadURL().subscribe((downloadURL: string) => {
this.angularFirestore
.collection(process.env.FIRESTORE_COLLECTION_FILES!) // Non-null assertion operator is required to let know the compiler that this value is not empty and exists.
.add({ downloadURL: downloadURL });
this.downloadURL.push(downloadURL);
});
}),
catchError((error: any) => {
return throwError(error);
})
)
.subscribe();
}
}
storage.rules
rules_version = '2';
service firebase.storage {
match /b/{bucket}/o {
match /{allPaths=**} {
allow read; // Required in order to send this as attachment.
// Allow write files Firebase Storage, only if:
// 1) File is no more than 20MB
// 2) Content type is in one of the following formats: .doc, .docx, .jpg, .jpeg, .pdf, .png, .xls, .xlsx.
allow write: if request.resource.size <= 20 * 1024 * 1024
&& (request.resource.contentType.matches('application/msword')
|| request.resource.contentType.matches('application/vnd.openxmlformats-officedocument.wordprocessingml.document')
|| request.resource.contentType.matches('image/jpg')
|| request.resource.contentType.matches('image/jpeg')
|| request.resource.contentType.matches('application/pdf')
|| request.resource.contentType.matches('image/png')
|| request.resource.contentType.matches('application/vnd.ms-excel')
|| request.resource.contentType.matches('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'))
}
}
}
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>
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
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