如何使用ADDMORE按钮在Angular 6中上传多个文件? [英] How to Upload multiple files in Angular 6 with ADDMORE button?
本文介绍了如何使用ADDMORE按钮在Angular 6中上传多个文件?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
你好，Everone.我一直在尝试上传上述(图像)用例.我知道只有一个文件时非常容易.但是现在情况有所不同，它由带有文件的对象数组组成. 现在我的问题是我该如何用对象数组(其中每个对象包含一个文件)来渲染formdata对象.对于动态形式，我使用了角电抗形式.任何人都可以建议我如何通过单击保存"按钮将整个数据发送到支持的数据. 对于后端，我使用了Springmvc. 预先感谢.
Hello, Everone. I've been trying to Upload above(image) use case. I know it is very easy when we have a single file. but now the scenario is different it consists of an array of objects with the file. Now my question is how can I render the formdata object with the array of objects where each object consists of a file. For dynamic form, I used angular reactive forms. Can anyone please suggest me how can send whole data to the backed with the single click on save button. For backend I used Springmvc. Thanks in advance.
我的Github上提供了完整的源代码:源
FullSource code availabe on my Github : Source
multi-files-upload.component.html
multi-files-upload.component.html
<div class="container-fluid">
<section class="content">
<div id="main-form-content">
<form [formGroup]="documentGrp" (ngSubmit)="OnSubmit(documentGrp.value)" #uploadDocumentsForm="ngForm" ngNativeValidate>
<div class="box box-solid box-primary">
<div class="box-body" formArrayName="items">
<h2 class="page-header text-blue ">
<i class="fa fa-files-o"></i> Upload Documents
</h2>
<div class="row">
<div class="col-sm-12">
<div *ngFor="let item of items.controls; let i = index;">
<div [formGroupName]="i">
<table id="tbl-upload" class="table table-bordered">
<tbody>
<tr *ngIf="i==0" class="active">
<th>Document Name</th>
<th>Document Description</th>
<th>Document File</th>
<th> </th>
</tr>
<tr>
<td>
<div class="form-group required">
<input type="text" class="form-control" name="doc_name" formControlName="doc_name" placeholder="Enter document Category"
required="">
<div class="help-block"></div>
</div>
</td>
<td>
<div class="form-group ">
<input type="text" class="form-control" name="doc_description" formControlName="doc_description" maxlength="100" placeholder="Enter document related descriptions"
required="">
<div class="help-block"></div>
</div>
</td>
<td>
<div class="form-group required">
<input type="file" name="admission_docs_path" title="Browse Document" (change)="fileSelectionEvent($event)" required="">
<div class="help-block"></div>
</div>
</td>
<td class="remove" *ngIf=" i!=0 ">
<a title="Remove" (click)="removeItem(i)" class="fa fa-minus-square fa-lg text-red"></a>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="pull-right">
<a class="btn btn-sm btn-success" title="Add More" style="" (click)="addItem()">
<i class="fa fa-plus-square"></i> Add More</a>
</div>
</div>
<!--./col-->
</div>
<!--./row-->
</div>
<!--./box-body-->
<div class="box-footer" style="align-content: center">
<button type="submit" class="btn btn-primary pull-right">Save</button>
</div>
</div>
</form>
</div>
</section>
</div>
multi-files-upload.component.ts
multi-files-upload.component.ts
import { Component, OnInit, Renderer } from '@angular/core';
import { FormBuilder, FormGroup, Validators, FormArray, FormControl, NgForm } from '@angular/forms';
import { MultifilesService } from './multifiles.service'
@Component({
selector: 'app-multi-files-upload',
templateUrl: './multi-files-upload.component.html',
styleUrls: ['./multi-files-upload.component.css']
})
export class MultiFilesUploadComponent implements OnInit {
constructor(private renderer: Renderer,
private formBuilder: FormBuilder,
private multifilesService: MultifilesService
) { }
public documentGrp: FormGroup;
ngOnInit() {
this.documentGrp = this.formBuilder.group({
doc_name: '',
doc_description: '',
documentFile: File,
items: this.formBuilder.array([this.createUploadDocuments()])
});
}
public doc_name = "";
public doc_description = "";
public documentFile: File;
createUploadDocuments(): FormGroup {
return this.formBuilder.group({
doc_name: '',
doc_description: '',
documentFile: File,
});
}
get items(): FormArray {
return this.documentGrp.get('items') as FormArray;
};
addItem(): void {
this.items.insert(0, this.createUploadDocuments())
}
removeItem(index: number) {
this.items.removeAt(index);
}
public fileSelectionEvent(fileInput: any) {
if (fileInput.target.files && fileInput.target.files[0]) {
var reader = new FileReader();
reader.onload = (event: any) => {
}
this.documentFile = (fileInput.target.files[0]);
console.log("the document is" + JSON.stringify(fileInput.target.files[0].name));
reader.readAsDataURL(fileInput.target.files[0]);
}
}
public OnSubmit(formValue: any) {
let total_form: FormData[] = [];
console.log(formValue.items)
formValue.items.forEach(element => {
let upl_fom: FormData = new FormData();
console.log("each element is", element);
upl_fom.append('document_category', element.doc_name);
upl_fom.append('document_details', element.doc_description);
upl_fom.append('document_file', element.documentFile);
total_form.push(upl_fom);
});
this.multifilesService.saveFiles(total_form).subscribe(data => {
console.log("result is ", data)
})
}
}
Multifiles.service.ts
Multifiles.service.ts
import { Injectable } from '@angular/core';
import { HttpClient,HttpHeaders } from '@angular/common/http';
@Injectable({
providedIn: 'root'
})
export class MultifilesService {
constructor( private http: HttpClient) { }
saveFiles(total_form)
{
return this.http.post("http://localhost:8181/uploadFiles",total_form);
}
}
UploadController.java
UploadController.java
@PostMapping("uploadFiles")
public String uploadMultiFiles(HttpServletRequest request)
{
System.out.println("hitting uploadFiles");
Enumeration e =request.getParameterNames();
while(e.hasMoreElements())
{
System.out.println(e.nextElement());
}
MultipartHttpServletRequest multiPartRequest = new DefaultMultipartHttpServletRequest(request);
try {
multiPartRequest = (MultipartHttpServletRequest) request;
multiPartRequest.getParameterMap();
//multipartRequest.
Iterator < String > it = multiPartRequest.getFileNames();
int i = 1;
while (it.hasNext()) {
MultipartFile multipart = multiPartRequest.getFile(it.next());
System.out.println("File name is "+multipart.getOriginalFilename());
}
}catch(Exception ex) {
}
return "uploaded ";
}
推荐答案
在尝试了不同的场景以渲染formdata对象之后，我在一个场景中成功了.
After trying with different scenarios to rendering the formdata object, I succeed in one scenario.
GitHub链接:来源
GitHub Link: Source
更新的文件
multi-files-upload.component.html
multi-files-upload.component.html
<div class="container-fluid">
<section class="content">
<div id="main-form-content">
<form [formGroup]="documentGrp" (ngSubmit)="OnSubmit(documentGrp.value)" #uploadDocumentsForm="ngForm" ngNativeValidate>
<div class="box box-solid box-primary">
<div class="box-body" formArrayName="items">
<h2 class="page-header text-blue ">
<i class="fa fa-files-o"></i> Upload Documents
</h2>
<div class="row">
<div class="col-sm-12">
<div *ngFor="let item of items.controls; let i = index;">
<div [formGroupName]="i">
<table id="tbl-upload" class="table table-bordered">
<tbody>
<tr *ngIf="i==0" class="active">
<th>Document Name</th>
<th>Document Description</th>
<th>Document File</th>
<th> </th>
</tr>
<tr>
<td>
<div class="form-group required">
<input type="text" class="form-control" name="doc_name" formControlName="doc_name" placeholder="Enter document Category"
required="">
<div class="help-block"></div>
</div>
</td>
<td>
<div class="form-group ">
<input type="text" class="form-control" name="doc_description" formControlName="doc_description" maxlength="100" placeholder="Enter document related descriptions"
required="">
<div class="help-block"></div>
</div>
</td>
<td>
<div class="form-group required">
<input type="file" title="Browse Document" (change)="fileSelectionEvent($event,i)" required="">
<div class="help-block"></div>
</div>
</td>
<td class="remove" *ngIf=" i!=0 ">
<a title="Remove" (click)="removeItem(i)" class="fa fa-minus-square fa-lg text-red"></a>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="pull-right">
<button type="submit" class="btn btn-sm btn-success" title="Add More" style="" (click)="addItem()">Add More</button>
</div>
</div>
<!--./col-->
</div>
<!--./row-->
</div>
<!--./box-body-->
<div class="box-footer" style="align-content: center">
<button type="submit" class="btn btn-primary pull-right">Save</button>
</div>
</div>
</form>
</div>
</section>
</div>
multi-files-upload.component.ts
multi-files-upload.component.ts
import { Component, OnInit, Renderer, ViewChild } from '@angular/core';
import { FormBuilder, FormGroup, Validators, FormArray, FormControl, NgForm } from '@angular/forms';
import { MultifilesService } from './multifiles.service'
@Component({
selector: 'app-multi-files-upload',
templateUrl: './multi-files-upload.component.html',
styleUrls: ['./multi-files-upload.component.css']
})
export class MultiFilesUploadComponent implements OnInit {
constructor(private renderer: Renderer,
private formBuilder: FormBuilder,
private multifilesService: MultifilesService
) { }
public documentGrp: FormGroup;
public totalfiles: Array<File> =[];
public totalFileName = [];
public lengthCheckToaddMore =0;
ngOnInit() {
this.documentGrp = this.formBuilder.group({
doc_name: '',
doc_description: '',
documentFile:new FormControl(File),
items: this.formBuilder.array([this.createUploadDocuments()])
});
}
createUploadDocuments(): FormGroup {
return this.formBuilder.group({
doc_name: '',
doc_description: '',
documentFile : File
});
}
get items(): FormArray {
return this.documentGrp.get('items') as FormArray;
};
addItem(): void {
//console.log("length is ",this.totalfiles.length);
//console.log("lengthCheckToaddMore ", this.lengthCheckToaddMore);
if(this.totalfiles.length!=0)
if( this.items.value[0].doc_name != "" && this.items.value[0].doc_description != "" && ((this.lengthCheckToaddMore) === (this.totalfiles.length)) )
{
this.items.insert(0, this.createUploadDocuments())
this.lengthCheckToaddMore=this.lengthCheckToaddMore+1;
}
}
removeItem(index: number) {
this.totalfiles.splice(index);
this.totalFileName.splice(index);
this.items.removeAt(index);
this.lengthCheckToaddMore=this.lengthCheckToaddMore-1;
// console.log("name are ",this.totalFileName);
}
public fileSelectionEvent(fileInput: any,oldIndex) {
//console.log("oldIndex is ", oldIndex);
if (fileInput.target.files && fileInput.target.files[0]) {
var reader = new FileReader();
reader.onload = (event: any) => {
}
if(oldIndex==0)
{
this.totalfiles.unshift((fileInput.target.files[0]))
this.totalFileName.unshift(fileInput.target.files[0].name)
}
else
{
this.totalfiles[oldIndex]=(fileInput.target.files[0]);
this.totalFileName[oldIndex]=fileInput.target.files[0].name
}
reader.readAsDataURL(fileInput.target.files[0]);
}
if(this.totalfiles.length == 1)
{
this.lengthCheckToaddMore=1;
}
}
public OnSubmit(formValue: any) {
let main_form: FormData = new FormData();
for(let j=0;j<this.totalfiles.length; j++)
{
console.log("the values is ",<File>this.totalfiles[j]);
console.log("the name is ",this.totalFileName[j]);
main_form.append(this.totalFileName[j],<File>this.totalfiles[j])
}
console.log(formValue.items)
//reverseFileNames=this.totalFileName.reverse();
let AllFilesObj= []
formValue.items.forEach((element, index) => {
console.log("index is ",index);
console.log("element is ", element);
let eachObj=
{
'doc_name' : element.doc_name,
'doc_description' : element.doc_description,
'file_name' : this.totalFileName[index]
}
AllFilesObj.push(eachObj);
});
//console.log("the Array data is ",AllFilesObj);
main_form.append("fileInfo",JSON.stringify(AllFilesObj))
this.multifilesService.saveFiles(main_form).subscribe(data => {
//console.log("result is ", data)
})
}
}
Multifiles.service.ts
Multifiles.service.ts
same code already in the question section.
MultiFileController.java
MultiFileController.java
@PostMapping("uploadFiles")
public String uploadMultiFiles(HttpServletRequest request)
{
System.out.println("hitting uploadFiles");
//System.out.println("data is "+ upladeedFiles);
List documentList= new ArrayList<>();
//System.out.println(request.getParameter("fileInfo"));
JSONArray jsonArray = new JSONArray(request.getParameter("fileInfo"));
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject jsonObj = jsonArray.getJSONObject(i);
documentList.add(jsonObj);
System.out.println("index "+ i +" -- "+jsonObj);
}
MultipartHttpServletRequest multiPartRequest = new DefaultMultipartHttpServletRequest(request);
try {
multiPartRequest = (MultipartHttpServletRequest) request;
multiPartRequest.getParameterMap();
Iterator<String> itr = multiPartRequest.getFileNames();
while (itr.hasNext()) {
MultipartFile mFile = multiPartRequest.getFile(itr.next());
System.out.println("FileName is "+mFile.getOriginalFilename());
// Do something with the mfile based on your requirement
}
} catch (Exception e) {
e.printStackTrace();
}
return "uploaded ";
}
如果您不理解该代码，请将其分叉到您的存储库中，然后使用控制台日志进行克隆和调试，这样您就可以清楚地了解该代码.谢谢
If you don't understand the code please fork it to your repository then clone and debug with console logs then you can clearly understand the code. Thanks
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