ASP.NET Web API实现简单的文件下载与上传

墨蓝 2021-09-17 00:30 287阅读 0赞

ASP.NET Web API实现简单的文件下载与上传。首先创建一个ASP.NET Web API项目，然后在项目下创建FileRoot目录并在该目录下创建ReportTemplate.xlsx文件，用于下面示例的使用。

**1、文件下载**

示例：实现报表模板文件下载功能。

1.1 后端代码

/// <summary>
    /// 下载文件
    /// </summary>
    [HttpGet]
    public HttpResponseMessage DownloadFile()
    {
        string fileName = "报表模板.xlsx";
        string filePath = HttpContext.Current.Server.MapPath("~/") + "FileRoot\\" + "ReportTemplate.xlsx";
        FileStream stream = new FileStream(filePath, FileMode.Open);
        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
        response.Content = new StreamContent(stream);
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
        {
            FileName = HttpUtility.UrlEncode(fileName)
        };
        response.Headers.Add("Access-Control-Expose-Headers", "FileName");
        response.Headers.Add("FileName", HttpUtility.UrlEncode(fileName));
        return response;
    }

1.2 前端代码

**2、文件上传**

示例：实现上传报表文件功能。

2.1 后端代码

/// <summary>
    /// 上传文件
    /// </summary>
    [HttpPost]
    public HttpResponseMessage UploadFile()
    {
        try
        {
            //获取参数信息
            HttpContextBase context = (HttpContextBase)Request.Properties["MS_HttpContext"];
            HttpRequestBase request = context.Request;      //定义传统request对象
            string monthly = request.Form["Monthly"];       //获取请求参数：月度
            string reportName = request.Form["ReportName"]; //获取请求参数：报表名称
    
            //保存文件
            string fileName = String.Format("{0}_{1}.xlsx", monthly, reportName);
            string filePath = HttpContext.Current.Server.MapPath("~/") + "FileRoot\\" + fileName;
            request.Files[0].SaveAs(filePath);
    
            //返回结果
            var result = new HttpResponseMessage
            {
                Content = new StringContent("上传成功", Encoding.GetEncoding("UTF-8"), "application/json")
            };
    
            return result;
        }
        catch (Exception ex)
        {
            throw ex;
        };
    }

2.2 前端代码