У меня есть небольшой REST API, который берет два PDF и возвращает URL сравнения из Draftable API.API был протестирован и работает нормально.Поскольку я новичок в REST API и Angular, у меня возникают проблемы с выяснением того, как отправить два PDF в API.
Вот как я тестировал мой API: 
часть API:
@PostMapping("/draftableDemo")
String compareJob(@RequestParam("file1") MultipartFile file1, @RequestParam("file2") MultipartFile file2) {
CompareJob compareJob = new CompareJob(convert(file1), convert(file2));
DraftableCompare draftableCompare = new DraftableCompare();
return draftableCompare.compare(compareJob);
}
Я нашел это ТАК сообщение , в котором были такие же проблемы, как и у меня.
- Как определить два PDF-файла на угловой стороне с их представляющими ключами?
- Должен ли я изменить то, что ожидает мой API?
- I 'я всегда читаю о загрузчике файлов Angular, о каком модуле все говорят?
Спасибо за любые советы, идеи или предложения!
РЕДАКТИРОВАТЬ: Мой HTML:
<div class="content"
fxLayout="row"
fxLayout.xs="column"
fxFlexFill>
<div fxFlex="50" fxFlex.xs="50" style="position: relative">
<div>
<div>
<p>
Open first PDF
</p>
<input (change)="onFileSelected(pdf1)" type="file" [multiple]="multiple" id="file1">
</div>
<div *ngIf="error" class="error mb">
{{ error.message | json }}
</div>
<div *ngIf="!isLoaded && !error && progressData" id="progress1">
<div class="bg">
<div class="bar" [style.width]="progressData.loaded / progressData.total * 100 + '%'"></div>
</div>
<span>{{ getInt(progressData.loaded / progressData.total * 100) }}%</span>
</div>
<pdf-viewer [src]="pdfSrc1"
[(page)]="page"
[rotation]="rotation"
[original-size]="originalSize"
[fit-to-page]="fitToPage"
(after-load-complete)="afterLoadComplete($event)"
[zoom]="zoom"
[show-all]="showAll"
[stick-to-page]="stickToPage"
[render-text]="renderText"
[external-link-target]="'blank'"
[autoresize]="autoresize"
[render-text-mode]="renderTextMode"
(error)="onError($event)"
(on-progress)="onProgress($event)"
(page-rendered)="pageRendered($event)"
></pdf-viewer>
</div>
</div>
<div fxFlex="50" style="position: relative">
<div>
<div>
<p>
Open second PDF
</p>
<input (change)="onFileSelected(pdf2)" type="file" [multiple]="multiple" id="file2">
</div>
<div *ngIf="error" class="error mb">
{{ error.message | json }}
</div>
<div *ngIf="!isLoaded && !error && progressData" id="progress2">
<div class="bg">
<div class="bar" [style.width]="progressData.loaded / progressData.total * 100 + '%'"></div>
</div>
<span>{{ getInt(progressData.loaded / progressData.total * 100) }}%</span>
</div>
<pdf-viewer [src]="pdfSrc2"
[(page)]="page"
[rotation]="rotation"
[original-size]="originalSize"
[fit-to-page]="fitToPage"
(after-load-complete)="afterLoadComplete($event)"
[zoom]="zoom"
[show-all]="showAll"
[stick-to-page]="stickToPage"
[render-text]="renderText"
[external-link-target]="'blank'"
[autoresize]="autoresize"
[render-text-mode]="renderTextMode"
(error)="onError($event)"
(on-progress)="onProgress($event)"
(page-rendered)="pageRendered($event)"
></pdf-viewer>
</div>
</div>
</div>
<hr>
<input type="file" [multiple]="multiple" #fileInput>
<file-upload #fu (change)="fu.upload()" [multiple]="true"></file-upload>
<div class="example-button-row">
<button mat-raised-button color="primary" routerLink="/draftable" (click)="compareDraftable()">Draftable</button>
<button mat-raised-button color="primary" routerLink="/pdfcompare">PDF compare</button>
<button mat-raised-button color="primary">Version3</button>
<button mat-raised-button color="primary">Version4</button>
</div>
И ТС:
export class MainComponent implements OnInit {
// pdfSrc1: string | PDFSource | ArrayBuffer = './assets/fullText2Page.pdf';
// pdfSrc2: string | PDFSource | ArrayBuffer = './assets/fullText1Page.pdf';
leftFile: File = null;
rightFile: File = null;
@Input() multiple = true;
@ViewChild('fileInput') inputEl: ElementRef;
constructor(private http: HttpClient) {
}
pdfSrc1: string | PDFSource | ArrayBuffer = '';
pdfSrc2: string | PDFSource | ArrayBuffer = '';
pdf1 = 'pdfSrc1';
pdf2 = 'pdfSrc2';
error: any;
page = 1;
rotation = 0;
zoom = 1;
originalSize = false;
pdf: any;
renderText = true;
progressData: PDFProgressData;
isLoaded = false;
stickToPage = false;
showAll = true;
autoresize = true;
fitToPage = false;
outline: any[];
renderTextMode = 2;
@ViewChild(PdfViewerComponent) private pdfComponent: PdfViewerComponent;
ngOnInit(): void {
}
/**
* Render PDF preview on selecting file
*/
onFileSelected(pdfSource) {
console.log('Source: ', pdfSource);
let $pdf: any;
if (pdfSource === 'pdfSrc1') {
$pdf = document.querySelector('#file1');
} else {
$pdf = document.querySelector('#file2');
}
if (typeof FileReader !== 'undefined') {
const reader = new FileReader();
reader.onload = (e: any) => {
if (pdfSource === 'pdfSrc1') {
this.pdfSrc1 = e.target.result;
} else {
this.pdfSrc2 = e.target.result;
}
};
reader.readAsArrayBuffer($pdf.files[0]);
}
}
/**
* Get pdf information after it's loaded
*/
afterLoadComplete(pdf: PDFDocumentProxy) {
this.pdf = pdf;
this.isLoaded = true;
this.loadOutline();
}
/**
* Get outline
*/
loadOutline() {
this.pdf.getOutline().then((outline: any[]) => {
this.outline = outline;
});
}
/**
* Handle error callback
*/
onError(error: any) {
this.error = error; // set error
}
/**
* Pdf loading progress callback
*/
onProgress(progressData: PDFProgressData) {
// console.log('Progress Data: ', progressData);
this.progressData = progressData;
this.isLoaded = false;
this.error = null; // clear error
}
getInt(value: number): number {
return Math.round(value);
}
/**
* Page rendered callback, which is called when a page is rendered (called multiple times)
*/
pageRendered(e: CustomEvent) {
// console.log('(page-rendered)', e);
}
compareDraftable() {
const fd = new FormData();
fd.append('file1', this.leftFile, this.leftFile.name);
this.http.post('localhost:8080/draftableDemo', fd)
.subscribe(res => {
console.log(res);
});
}
upload() {
const inputEl: HTMLInputElement = this.inputEl.nativeElement;
const fileCount: number = inputEl.files.length;
const formData = new FormData();
if (fileCount > 0) { // a file was selected
for (let i = 0; i < fileCount; i++) {
formData.append('file[]', inputEl.files.item(i));
}
this.http
.post('localhost:8080/draftableDemo', formData);
// do whatever you do...
// subscribe to observable to listen for response
}
}