asp.net core文件上传与下载

后台代码

    public class FileController : Controller
    {
        /// <summary>
        /// 跟asp.net webform和asp.net mvc不一样,通过注入的方式,获取项目所在路径
        /// </summary>
        private IHostingEnvironment _hostEnv;
        public FileController(IHostingEnvironment env)
        {
            _hostEnv = env;
            //其他服务
        }

        public IActionResult Index()
        {
            return View();
        }

        /// <summary>
        /// 方式一 输出文本文件
        /// </summary>
        /// <returns></returns>
        public IActionResult DownloadFile1()
        {
            var buffer = Encoding.UTF8.GetBytes("asp.net core download file");
            return File(buffer, "text/plain", "file.txt");
        }

        /// <summary>
        /// 方式二 输出文本文件
        /// </summary>
        /// <returns></returns>
        public IActionResult DownloadFile2()
        {
            var stream = new MemoryStream();
            var streamWriter = new StreamWriter(stream);
            streamWriter.Write("{\"content\":\"asp.net core download file\"}");
            streamWriter.Flush();
            stream.Seek(0, SeekOrigin.Begin);
            return File(stream, "text/plain", "file.json");
        }

        /// <summary>
        /// 方式三 输出图片文件
        /// </summary>
        /// <returns></returns>
        public IActionResult DownloadFile3()
        {
            var path = Path.Combine(_hostEnv.ContentRootPath, "UploadFile", "netcore5.png");
            var fileExtensionName = Path.GetExtension(path);
            return PhysicalFile(path, "image/png", $"{DateTime.Now.ToString("yyyyMMddhhmmss")}.{fileExtensionName}");
        }

        /// <summary>
        /// 多文件上传
        /// </summary>
        /// <param name="files">文件上传的name</param>
        /// <returns></returns>
        public IActionResult UploadFile(IList<IFormFile> files)
        {
            if (files != null)
            {
                //处理多文件
                foreach (var file in files)
                {
                    //如果需要对文件处理,可以根据文件扩展名,进行筛选
                    var fileExtensionName = Path.GetExtension(file.FileName).Substring(1);
                    var saveFilePath = Path.Combine(_hostEnv.ContentRootPath, "UploadFile", $"{DateTime.Now.ToString("yyyyMMddhhmmss")}.{fileExtensionName}");
                    var stream = new FileStream(saveFilePath, FileMode.Create);
                    //asp.net core对异步支持很好,如果使用异步可以使用file.CopyToAsync方法
                    file.CopyTo(stream);
                }
                return Ok();
            }
            else
            {
                return Ok();
            }
        }
    }

html文件上传

<html>
<head>
    <title>文件上传</title>
</head>
<body>
    <form action="/File/UploadFile" enctype="multipart/form-data" method="post">
        <input type="file" name="files" multiple />
        <input type="submit" value="上传文件" />
    </form>
</body>
</html>




秋风 2016-11-10
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