后端服務使用的是Asp.net WebApi,至于如果有環境搭建或者怎么引入上傳控制元件這一類的問題，請自行百度，都有手冊多看幾遍，
在此記錄的是核心的一些代碼，沒有給出界面UI，因為重點是給出思路和怎么用
1.頁面引入nz-upload
1.我們在Angular頁面引入控制元件，主要介紹2個重要的屬性，其他的建議讀下手冊
- 1.1. nzFileList的值就是雙向系結的檔案串列，就是最終需要傳到后端的，你如果需要展示那也可以取這里的值
- 1.2. nzBeforeUpload 一定要使用
箭頭函式，箭頭函式，箭頭函式，不要問為什么重復，踩過坑的,上傳之前執行的事件
<nz-upload [nzAction]="''" [(nzFileList)]="fileList" nzMultiple [nzLimit]="0" [nzShowUploadList]="false"
[nzBeforeUpload]="beforeUpload">
<button [disabled]="false" nz-button nzType="primary" nz-popover nzPopoverContent="Upload File">
<i nz-icon nzType="upload"></i>
</button>
</nz-upload>
2.鉤子事件和上傳事件
1.鉤子事件就是上傳事件之前執行的事件,可以做一些校驗等操作，當然你也可以寫在上傳事件中，隨處可見的AOP
fileList: NzUploadFile[] = [];
beforeUpload = (file: NzUploadFile): boolean => {
//判斷檔案大小
const isLt4M = file.size! / 1024 / 1024 < 4;
if (!isLt4M) {
this.message.error('Message.File.SizeFile');
return false;
}
this.fileList = this.fileList.concat(file);
return true;
}
2.上傳事件用于將檔案資訊提交到后端
async handleUpload() {
const formData = https://www.cnblogs.com/yuxl01/archive/2022/04/05/new FormData();
//將檔案系結到FormData中
this.fileList.forEach((file: any) => {
formData.append("files[]", file);
});
//給后端檔案服務標識來源于什么系統
formData.append("system", "OA");
//給后端檔案服務標識是什么型別的附件
formData.append('annexType', "附件型別");
//使用Post呼叫檔案服務
this.httpclient.post<any>("192.168.0.105/api/FileServer/UploadFile", formData).toPromise();
}
3.下載檔案
1.定義下載物件，然后呼叫后端下載api介面
downLoadFile(file: Attachment): void {
const DownloadRequest = {
FileFullPath: 檔案服務器摘要回傳的檔案路徑,
FileId: 檔案服務器摘要回傳的檔案ID,
FullFileName: 檔案服務器摘要回傳的檔案名稱,
};
let head = new HttpHeaders({ 'Content-Type': 'application/json' });
//呼叫檔案下載服務
this.httpclient.post<any>("192.168.0.105/api/FileServer/DownloadFile",DownloadRequest,{ headers: head, responseType: 'arraybuffer' }).subscribe(
(result) => {
if ('msSaveOrOpenBlob' in navigator) {
const nav = window.navigator as any;
nav.msSaveOrOpenBlob(
new Blob([]),
DownloadRequest.FullFileName
);
return;
} else {
const url = window.URL.createObjectURL(new Blob([result]));
const link = document.createElement('a');
link.style.display = 'none';
link.href = https://www.cnblogs.com/yuxl01/archive/2022/04/05/url;
link.setAttribute('download', DownloadRequest.FullFileName);
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
return url;
}
})
3.后端WebAPI服務
-
在這里實作思路為檔案服務器保存檔案，并生成檔案一對一的
摘要資訊,回傳到客戶端，客戶端收到上傳成功的摘要資訊，然后將摘要Id與業務資料系結，存到業務資料庫，下次加載資料，根據摘要Id來找到對應的檔案資訊，然后訪問檔案服務器下載檔案， -
這里暫時不考慮，如果多個檔案是否完整上傳，中間有失敗的情況，為了服務器安全，后端和前端應適當過濾篩選出一些不能被上傳的檔案后綴，例如DLL exe這些，這只是個小建議，當然您可以使用，你所喜歡的任何檔案服務中間件，作為你的檔案服務器
3.控制器中接收檔案上傳內容,存入本地磁盤檔案夾，然后回傳檔案資訊的摘要包含如下
- 檔案對應生成的唯一id
- 檔案存盤檔案夾路徑
- 檔案內容長度
- 檔案后綴名
- 檔案是否被壓縮
控制器接收
[HttpPost]
[Route("api/FileServer/UploadFile")]
public HttpResponseMessage UploadFile()
{
HttpRequest httpRequest = HttpContext.Current.Request;
string config = httpRequest.Params["system"].Trim();
string annexType = httpRequest.Params["annexType"].Trim();
if (string.IsNullOrEmpty(config) || string.IsNullOrEmpty(annexType))
{
return Request.CreateResponse(HttpStatusCode.BadRequest, "config and annexType is required.");
}
string FilePath = ConfigurationManager.AppSettings[config];
var filePath = HttpContext.Current.Server.MapPath(FilePath + annexType) + "\\";
if (!Directory.Exists(filePath)) Directory.CreateDirectory(filePath);
return UploadFileHandler(httpRequest,filePath);
}
檔案處理方法
[NonAction]
public HttpResponseMessage UploadFileHandler(HttpRequest httpRequest, string filePath)
{
try
{
HttpResponseMessage result = null;
if (httpRequest.Files.Count > 0)
{
//檔案資訊的摘要
List<FileData> ResponseData = https://www.cnblogs.com/yuxl01/archive/2022/04/05/new List();
for (int i = 0; i < httpRequest.Files.Count; i++)
{
FileData fileData = new FileData();
var postedFile = httpRequest.Files[i];
string guid = Guid.NewGuid().ToString().ToUpper();
//一個一個檔案保存到本地磁盤
postedFile.SaveAs(filePath + guid);
fileData.FileId = guid;
fileData.FullFileName = postedFile.FileName;
fileData.FileFullPath = filePath + guid;
fileData.ContentLength = postedFile.ContentLength;
fileData.Extension = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf('.'));
fileData.isZipFile = false;
ResponseData.Add(fileData);
}
result = Request.CreateResponse(HttpStatusCode.Created, ResponseData);
}
else
{
result = Request.CreateResponse(HttpStatusCode.BadRequest);
}
return result;
}
catch (Exception e)
{
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.InternalServerError);
response.ReasonPhrase = e.Message;
return response;
}
}
2.下載檔案服務
[HttpPost]
[Route("api/FileServer/DownloadFile")]
public HttpResponseMessage DownloadFile(DownloadRequest request)
{
try
{
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
System.IO.FileInfo fileInfo = new System.IO.FileInfo(request.FileFullPath);
if (!fileInfo.Exists)
{
response = new HttpResponseMessage(HttpStatusCode.NotFound);
response.ReasonPhrase = "File does not exists.";
return response;
}
FileStream stream = new FileStream(request.FileFullPath, FileMode.Open);
response.Content = new StreamContent(stream);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/force-download");
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = HttpUtility.UrlEncode(request.FullFileName)
};
response.Headers.Add("Access-Control-Expose-Headers", "FileName");
response.Headers.Add("FileName", HttpUtility.UrlEncode(request.FullFileName));
return response;
}
catch (Exception e)
{
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.InternalServerError);
response.ReasonPhrase = e.Message;
return response;
}
}
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標籤：其他