js
<!doctype html> <html> <head> <meta charset="utf-8"> <title>js上传图片</title> </head> <body> <input id="file" type="file"> <script type="text/javascript"> window.onload = function myfunction() { var input = document.getElementById('file'); input.onchange = function () { var files = this.files; for (var i = 0, len = files.length; i < len; i++) { var file = files[i]; //file.name || file.fileName => 文件名称 //file.size || file.fileSize => 文件大小 upload_html5(file); } }; } function upload_html5(file) { //html5 上传 var xhr = new XMLHttpRequest(); //上传进度事件 xhr.upload.addEventListener("progress", function (e) { }, false); //上传完成（成功）事件 xhr.addEventListener("load", function (e) { //获取服务器响应 var obj = JSON.parse(e.target.responseText); if (obj.code == 200) { alert("上传成功"); } else { alert(obj.message); } }, false); //上传失败事件 xhr.addEventListener("error", function (e) { console.log(e); alert("上传失败"); }, false); //上传中断（取消）事件 xhr.addEventListener("abort", function (e) { alert("上传取消"); }, false); var fd = new FormData; //添加要上传的文件对象 fd.append("file", file); fd.append("hallName", '分会场1'); fd.append("dateTime", '2019-06-21'); xhr.open("POST", "/Common/UploadFile"); xhr.send(fd); } </script> </body> </html>
C#
public ActionResult UploadFile() { var baseDirectory = AppDomain.CurrentDomain.BaseDirectory; var directory = string.Format("{0}/Upload/{1}/", baseDirectory, Request.Form["hallName"]); if (!Directory.Exists(directory)) Directory.CreateDirectory(directory); var file = Request.Files[0]; var fileTypes = new string[] { "image/jpeg", "image/gif", "image/png" }; if (!fileTypes.Contains(file.ContentType)) return Json(new Response(302, "只可上传图片")); Image img = Image.FromStream(file.InputStream); var filePath = string.Format("{0}/{1}.jpg", directory, Request.Form["dateTime"]); ImageCompress(img, filePath, 50); return Json(new Response()); } /// <summary> /// 将图片按百分比压缩 /// </summary> public static bool ImageCompress(Image source, string savePath, byte percent) { var parameters = new EncoderParameters(); parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, new long[] { percent }); try { ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageDecoders(); ImageCodecInfo jpegICIinfo = arrayICI.SingleOrDefault(a => a.FormatDescription.Equals("JPEG", StringComparison.OrdinalIgnoreCase)); if (jpegICIinfo != null) source.Save(savePath, jpegICIinfo, parameters); else source.Save(savePath, source.RawFormat); return true; } catch (Exception ex) { return false; } finally { source.Dispose(); } }