Nrthugu

I want to implement file download using this Angular 6 code:

Rest API:

private static final Logger LOG = LoggerFactory.getLogger(DownloadsController.class);



private static final String EXTERNAL_FILE_PATH = "/Users/test/Documents/blacklist_api.pdf";



@GetMapping("export")

public ResponseEntity<FileInputStream> export() throws IOException {

    File pdfFile = Paths.get(EXTERNAL_FILE_PATH).toFile();



    HttpHeaders headers = new HttpHeaders();

    headers.add("Cache-Control", "no-cache, no-store, must-revalidate");

    headers.add("Pragma", "no-cache");

    headers.add("Expires", "0");



    return ResponseEntity.ok().headers(headers).contentLength(pdfFile.length())

            .contentType(MediaType.parseMediaType("application/pdf"))

            .body(new FileInputStream(pdfFile));

}

Service:

import {Injectable} from '@angular/core';

import {HttpClient, HttpParams} from "@angular/common/http";

import {Observable} from "rxjs/index";

import {environment} from "../../../environments/environment";

import {HttpUtils} from "../common/http-utils";

import { map } from 'rxjs/operators';

import {Http, ResponseContentType} from '@angular/http';





@Injectable({

  providedIn: 'root'

})

export class DownloadService {



  constructor(private http: HttpClient) {

  }



  downloadPDF(): any {

    return this.http.get(environment.api.urls.downloads.getPdf, {

        responseType: 'blob'

      })

      .pipe(

        map((res: any) => {

          return new Blob([res.blob()], {

            type: 'application/pdf'

          })

        })

      );

    }  

}

Component:

import {Component, OnInit} from '@angular/core';

import {DownloadService} from "../service/download.service";

import {ActivatedRoute, Router} from "@angular/router";

import {flatMap} from "rxjs/internal/operators";

import {of} from "rxjs/index";

import { map } from 'rxjs/operators';



@Component({

  selector: 'app-download',

  templateUrl: './download.component.html',

  styleUrls: ['./download.component.scss']

})

export class DownloadComponent implements OnInit {



  constructor(private downloadService: DownloadService,

              private router: Router,

              private route: ActivatedRoute) {

  }



  ngOnInit() {   

  }



  export() {               

    this.downloadService.downloadPDF().subscribe(res => {

      const fileURL = URL.createObjectURL(res);

      window.open(fileURL, '_blank');

    });         

  } 

}

The file is present in the directory but when I try to download it I get error:

18:35:25,032 WARN  [org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver] (default task-2) Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]

Do you know how I can fix this issue?
Do I need to add additional configuration in order to download the file via Angular web UI?

I use spring-boot-starter-parent version 2.1.0.RELEASE