中上传多个文件

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如何使用添加按钮在 Angular 6 中上传多个文件?

本文介绍了如何使用添加按钮在 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面(图片)用例.我知道当我们只有一个文件时这很容易.但现在情况不同了，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呈现 formdata 对象，其中每个对象由一个文件组成.对于动态形式，我使用了角度反应形式.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.对于后端，我使用了 Springmvc.提前致谢.我的 Github 上的完整源代码:源multi-files-upload.component.html<section class="内容"><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>上传文件<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"><tr *ngIf="i==0" class="active"><th>文档名称</th><th>文档文件</th><th>&nbsp;</th></tr><tr><td><div class="form-group required"><input type="text" class="form-control" name="doc_name" formControlName="doc_name" placeholder="输入文档类别"必需=""><div class="help-block"></div></td><td><div class="form-group"><input type="text" class="form-control" name="doc_description" formControlName="doc_description" maxlength="100" placeholder="输入文档相关描述"必需=""><div class="help-block"></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></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><div class="pull-right"><a class="btn btn-sm btn-success" title="添加更多" style="" (click)="addItem()"><i class="fa fa-plus-square"></i>&nbsp;添加更多<!--./col--><!--./row--><!--./box-body--><div class="box-footer" style="align-content: center"><button type="submit" class="btn btn-primary pull-right">保存</button></表单></节>multi-files-upload.component.tsimport { Component, OnInit, Renderer } from '@angular/core';import { FormBuilder, FormGroup, Validators, FormArray, FormControl, NgForm } from '@angular/forms';从 './multifiles.service' 导入 { MultifilesService }@成分({选择器:'app-multi-files-upload',templateUrl: './multi-files-upload.component.html',styleUrls: ['./multi-files-upload.component.css']})导出类 MultiFilesUploadComponent 实现 OnInit {构造函数(私有渲染器:渲染器，私有表单构建器:FormBuilder，私有多文件服务:多文件服务) { }公共文档组:FormGroup；ngOnInit() {this.documentGrp = this.formBuilder.group({文档名称:'',doc_description: '',文件文件:文件，项目:this.formBuilder.array([this.createUploadDocuments()])});}公共文档名称 = "";公共 doc_description = "";公共文档文件:文件；createUploadDocuments(): FormGroup {返回 this.formBuilder.group({文档名称:'',doc_description: '',文件文件:文件，});}获取项目():FormArray {返回 this.documentGrp.get('items') 作为 FormArray;};添加项目():无效{this.items.insert(0, this.createUploadDocuments())}删除项目(索引:数字){this.items.removeAt(index);}公共文件选择事件(文件输入:任何){if (fileInput.target.files && fileInput.target.files[0]) {var reader = new FileReader();reader.onload = (event: any) =>{}this.documentFile = (fileInput.target.files[0]);console.log("文档是" + JSON.stringify(fileInput.target.files[0].name));reader.readAsDataURL(fileInput.target.files[0]);}}公共 OnSubmit(formValue: any) {让 total_form: FormData[] = [];控制台日志(formValue.items)formValue.items.forEach(元素 => {让 upl_fom: FormData = new FormData();console.log("每个元素都是", 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("结果为", 数据)})}}Multifiles.service.tsimport { Injectable } from '@angular/core';从 '@angular/common/http' 导入 { HttpClient,HttpHeaders };@Injectable({提供在:'根'})导出类 MultifilesService {构造函数(私有http:HttpClient){}保存文件(total_form){return this.http.post("http://localhost:8181/uploadFiles",total_form);}}上传控制器.java @PostMapping("uploadFiles")public String uploadMultiFiles(HttpServletRequest 请求){System.out.println("点击上传文件");枚举 e =request.getParameterNames();while(e.hasMoreElements()){System.out.println(e.nextElement());}MultipartHttpServletRequest multiPartRequest = new DefaultMultipartHttpServletRequest(request);尝试 {multiPartRequest = (MultipartHttpServletRequest) 请求；multiPartRequest.getParameterMap();//多部分请求.迭代器字符串 >it = multiPartRequest.getFileNames();int i = 1;而 (it.hasNext()) {MultipartFile multipart = multiPartRequest.getFile(it.next());System.out.println("文件名是"+multipart.getOriginalFilename());}}catch(异常前){}返回已上传"；} 解决方案 在尝试使用不同的场景渲染 formdata 对象后，我在一个场景中成功了.GitHub 链接:来源更新的文件multi-files-upload.component.html<section class="内容"><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>上传文件<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"><tr *ngIf="i==0" class="active"><th>文档名称</th>文档描述<th>文档文件</th><th>&nbsp;</th></tr><tr><td><div class="form-group required"><input type="text" class="form-control" name="doc_name" formControlName="doc_name" placeholder="输入文档类别"必需=""><div class="help-block"></div></td><td><div class="form-group"><input type="text" class="form-control" name="doc_description" formControlName="doc_description" maxlength="100" placeholder="输入文档相关描述"必需=""><div class="help-block"></div></td><td><div class="form-group required"><input type="file" title="Browse Document" (change)="fileSelectionEvent($event,i)" required=""><div class="help-block"></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><div class="pull-right"><button type="submit" class="btn btn-sm btn-success" title="添加更多" style="" (click)="addItem()">添加更多</button><!--./col--><!--./row--><!--./box-body--><div class="box-footer" style="align-content: center"><button type="submit" class="btn btn-primary pull-right">保存</button></表单></节>multi-files-upload.component.tsimport { Component, OnInit, Renderer, ViewChild } from '@angular/core';import { FormBuilder, FormGroup, Validators, FormArray, FormControl, NgForm } from '@angular/forms';从 './multifiles.service' 导入 { MultifilesService }@成分({选择器:'app-multi-files-upload',templateUrl: './multi-files-upload.component.html',styleUrls: ['./multi-files-upload.component.css']})导出类 MultiFilesUploadComponent 实现 OnInit {构造函数(私有渲染器:渲染器，私有表单构建器:FormBuilder，私有多文件服务:多文件服务) { }公共文档组:FormGroup；公共总文件:数组=[];公共总文件名 = [];public lengthCheckToaddMore =0;ngOnInit() {this.documentGrp = this.formBuilder.group({文档名称:'',doc_description: '',文档文件:新的表单控件(文件)，项目:this.formBuilder.array([this.createUploadDocuments()])});}createUploadDocuments(): FormGroup {返回 this.formBuilder.group({文档名称:'',doc_description: '',文档文件:文件});}获取项目():FormArray {返回 this.documentGrp.get('items') 作为 FormArray;};添加项目():无效{//console.log("长度为",this.totalfiles.length);//console.log("lengthCheckToaddMore ", this.lengthCheckToaddMore);如果(this.totalfiles.length！=0)if( this.items.value[0].doc_name != "" &&&& this.items.value[0].doc_description != "" && ((this.lengthCheckToaddMore) === (this.总文件数.长度))){this.items.insert(0, this.createUploadDocuments())this.lengthCheckToaddMore=this.lengthCheckToaddMore+1;}}删除项目(索引:数字){this.totalfiles.splice(index);this.totalFileName.splice(index);this.items.removeAt(index);this.lengthCheckToaddMore=this.lengthCheckToaddMore-1;//console.log("name are ",this.totalFileName);}公共文件选择事件(文件输入:任何，旧索引){//console.log("oldIndex is ", oldIndex);if (fileInput.target.files && fileInput.target.files[0]) {var reader = new FileReader();reader.onload = (event: any) =>{}如果(旧索引== 0){this.totalfiles.unshift((fileInput.target.files[0]))this.totalFileName.unshift(fileInput.target.files[0].name)}别的{this.totalfiles[oldIndex]=(fileInput.target.files[0]);this.totalFileName[oldIndex]=fileInput.target.files[0].name}reader.readAsDataURL(fileInput.target.files[0]);}如果(this.totalfiles.length == 1){this.lengthCheckToaddMore=1;}}公共 OnSubmit(formValue: any) {让 main_form: FormData = new FormData();for(let j=0;jthis.totalfiles[j]);console.log("名称是",this.totalFileName[j]);main_form.append(this.totalFileName[j],<File>this.totalfiles[j])}控制台日志(formValue.items)//reverseFileNames=this.totalFileName.reverse();让 AllFilesObj= []formValue.items.forEach((element, index) => {console.log("索引为",index);console.log("元素是", element);让 eachObj={'doc_name' : element.doc_name,'doc_description' : element.doc_description,'file_name' : this.totalFileName[index]}AllFilesObj.push(eachObj);});//console.log("数组数据为",AllFilesObj);main_form.append("fileInfo",JSON.stringify(AllFilesObj))this.multifilesService.saveFiles(main_form).subscribe(data => {//console.log("result is ", data)})}}Multifiles.service.ts问题部分中已有相同的代码.MultiFileController.java@PostMapping("uploadFiles")public String uploadMultiFiles(HttpServletRequest 请求){System.out.println("点击上传文件");//System.out.println("数据为"+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);尝试 {multiPartRequest = (MultipartHttpServletRequest) 请求；multiPartRequest.getParameterMap();迭代器itr = multiPartRequest.getFileNames();而 (itr.hasNext()) {MultipartFile mFile = multiPartRequest.getFile(itr.next());System.out.println("文件名是"+mFile.getOriginalFilename());//根据您的要求对 mfile 做一些事情}} 捕获(异常 e){e.printStackTrace();}返回已上传"；}如果您不理解代码，请将其分叉到您的存储库，然后使用控制台日志进行克隆和调试，然后您就可以清楚地理解代码.谢谢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.FullSource code availabe on my Github : Sourcemulti-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>&nbsp;</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>&nbsp; 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.tsimport { 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.tsimport { 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 "; } 解决方案 After trying with different scenarios to rendering the formdata object, I succeed in one scenario. GitHub Link: SourceUpdated filesmulti-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>&nbsp;</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.tsimport { 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.tssame 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 "; }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 这篇关于如何使用添加按钮在 Angular 6 中上传多个文件?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！
10-10 19:14
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