我正在嘗試從服務器下載文件，但該文件未顯示其原始內容，而是顯示 [object Object]。WEB API核心[Authorize(AuthenticationSchemes = "Bearer")][HttpGet]public HttpResponseMessage DownloadContractFile(string fileName){ string contentRootPath = _hostingEnvironment.ContentRootPath; var folderName = Path.Combine(contentRootPath, FileHandler.ContractFilePath, Convert.ToInt32(User.Identity.Name).ToString()); var path = Path.Combine(folderName, fileName); var memory = new MemoryStream(); HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK); using (var stream = new FileStream(path, FileMode.Open)) { result.Content = new StreamContent(stream); result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment"); result.Content.Headers.ContentDisposition.FileName = Path.GetFileName(path); result.Content.Headers.ContentType = new MediaTypeHeaderValue(FileHandler.GetContentType(path)); // Text file result.Content.Headers.ContentLength = stream.Length; return result; }}Angular 代碼：服務方法 downloadContractFile(fileName: string) { const obj: any = { fileName: fileName }; const httpParams: HttpParamsOptions = { fromObject: obj } as HttpParamsOptions; const httpOptions = { params: new HttpParams(httpParams), headers: new HttpHeaders({ 'Content-Type': 'application/octet-stream', 'Authorization': 'Bearer ' + this.jwt.getToken }) }; return this.http.get<Array<any>>(`${this.settings.getApiSettings('uri')}/api/contract/DownloadContractFile`, httpOptions).map( /// <<<=== use `map` here (response) => { if (response["status"] == 401) { this.jwt.redirectToLogin(); } else if (response["status"] < 200 || response["status"] >= 300) { throw new Error('This request has failed ' + response["status"]); } let data = response; return data; } ); }
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精慕HU
TA貢獻1845條經驗 獲得超8個贊
這是我在項目中用來下載文件的代碼。
控制器代碼：
[HttpGet("DownloadFile")]
public async Task<IActionResult> DownloadFile(string fileName = "")
{
var response = await DownloadFileFromDatabase(fileName);
if (response.IsSuccessStatusCode)
{
System.Net.Http.HttpContent content = response.Content;
var contentStream = await content.ReadAsStreamAsync();
var audioArray = ReadFully(contentStream);
return Ok(new { response = audioArray, contentType = "audio/wav", fileName });
}
else
{
throw new FileNotFoundException();
}
}
客戶端代碼：
HandleBase64 (data , contentType,fileName ){
let byteCharacters = atob(data);
let byteNumbers = new Array(byteCharacters.length);
for (var i = 0; i < byteCharacters.length; i++)
byteNumbers[i] = byteCharacters.charCodeAt(i);
let byteArray = new Uint8Array(byteNumbers);
let blob = new Blob([byteArray], {type: contentType});
if(contentType === "audio/wav"){
var blobURL=URL.createObjectURL(blob);
window.open(blobURL);
}
else{
var blobURL = window.URL.createObjectURL(blob);
var anchor = document.createElement("a");
anchor.download = fileName;
anchor.href = blobURL;
anchor.click();
}
}
您也可以在控制器端使用文件流簡單地返回文件。這將自動下載不需要在客戶端處理的文件
return File(stream, "application/octet-stream");
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