如何使用ADDMORE按钮在Angular 6中上传多个文件？
你好，Everone。我一直在尝试上传上方（图片）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，我的问题是如何使用对象数组（其中每个对象包含一个文件）来渲染formdata对象。对于动态形式，我使用了角反应形式。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。
我的Github上提供了完整的源代码：Source
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
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
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
@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 ";
}
1 个答案:
答案 0 :(得分：2)
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。
GitHub链接：Source
更新的文件
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
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
same code already in the question section.
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
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