ASP.NET Core WebAPI如何获得远程文件返回文件流给前端?

 

一、根据网络路径把文件保存成byte[]返回给前端

项目采用的是前后端分离的模式，后端使用ASP.NET Core WebAPI方式，将文件流返回给前端。

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/// <summary> /// 根据网络路径把文件保存成byte[] /// </summary> /// <param name="filePath"></param> public byte[] UrlToByte(string filePath) {     HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(filePath);     req.Method = "GET";     using (WebResponse wr = req.GetResponse())     {         StreamReader responseStream = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);         int length = (int)wr.ContentLength;         byte[] bs = new byte[length];            HttpWebResponse response = wr as HttpWebResponse;         Stream stream = response.GetResponseStream();            //读取到内存         MemoryStream stmMemory = new MemoryStream();         byte[] buffer1 = new byte[length];         int i;         while ((i = stream.Read(buffer1, 0, buffer1.Length)) > 0)         {             stmMemory.Write(buffer1, 0, i);         }         byte[] arraryByte = stmMemory.ToArray();         stmMemory.Close();         return arraryByte;     } }

 

二、解决前端无法获得fileName

前端采用的是Vue技术栈，采用的是axios调用后端接口。前端无法获得fileName需要修改后端ASP.NET Core WebAPI项目中的【Startup.cs】文件。

 修改ConfigureServices方法中的AddCors。

 

代码示例：

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1	.WithExposedHeaders("Content-Disposition");//应前端要求暴露Content-Disposition

 

原文链接：https://www.cnblogs.com/kimiliucn/p/17589873.html