mvc4 截取上传图片做头像，自动生成不同小尺寸缩略图
来源：互联网 发布：淘宝宝贝上架时间 编辑：程序博客网 时间：2024/04/30 12:21
很多SNS网站，可以上传头像，微博也是一样，上传的头像经自由裁剪合适后，自动生成多种不同尺寸高质量清晰的，如大中小。
效果如下：（下载链接在最下面）
实现：
页面代码：
<p class="phototxt">选择你要上传的头像</p> <div class="upfile"> @using (Html.BeginForm("uploadHead", "ucenter", FormMethod.Post, new { ID = "user_head_form", enctype = "multipart/form-data" })){ <input type="file" name="head" class="filebtn" onchange="$('#user_head_upload_box').hide();$('#user_head_show_box').show();$('#user_head_form').submit();" /> <input type="button" class="upimgbtn" value="上传头像" /> } </div>
<div class="sysbtn"> @using (Html.BeginForm("saveHead", "ucenter", FormMethod.Post, new { ID = "user_head_param_form", enctype = "multipart/form-data" })) { @Html.HiddenFor(model => model.headFileName, new { id = "head_name" }) @Html.HiddenFor(model => model.x, new { id = "head_x" }) @Html.HiddenFor(model => model.y, new { id = "head_y" }) @Html.HiddenFor(model => model.width, new { id = "head_width" }) @Html.HiddenFor(model => model.height, new { id = "head_height" }) <input type="submit" class="btnyes" value="保存"> <input type="button" class="btnno" value="取消" onclick="cancelHead();"> } </div>
section Scripts{ <script src="@Url.Content("~/Scripts/jquery-1.7.1.min.js")"></script> <script src="@Url.Content("~/Scripts/jquery.form.js")"></script> <script src="@Url.Content("~/Scripts/imgareaselect/jquery.imgareaselect.pack.js")"></script> <script src="@Url.Content("~/Scripts/head.js")"></script> <script src="@Url.Content("~/Scripts/popup.js")"></script> <script type="text/javascript"> $(document).ready(function () { $("#user_head_form").ajaxForm({ success: function (data) { $('#user_head_upload_box').show(); $('#user_head_show_box').hide(); if (data != undefined && data != null) { if (data.msg == 0) { showreward("<span class=\"g_error\">请上传图片！</span>"); } else if (data.msg == -1) { showreward("<span class=\"g_error\">文件格式不对！</span>"); } else if (data.msg == -2) { showreward("<span class=\"g_error\">上传图片不能超过10M！</span>"); } else if (data.msg == -3) { showreward("<span class=\"g_error\">出现异常，请稍后再试！！</span>"); } else { var path = "/avatar/temp/" + data.msg; $("#head_name").val(data.msg); UserHeadUtil.initialize(path); } } } }); $("#user_head_param_form").ajaxForm({ success: function (data) { if (data.msg == 0) { showreward("<span class=\"g_error\">网络出现异常，请稍后再试！</span>"); } else if (data.msg == -1) { showreward("<span class=\"g_error\">系统出现异常，请稍后再试！</span>"); } else { showreward("<span class=\"g_ok\">修改成功！</span>"); $("img#origin_user_head_75").attr("src", "/avatar/75/" + data); $("img#top_user_head_25").attr("src", "/avatar/25/" + data); $('img#user_head_origin').imgAreaSelect({ remove: true }); $("#user_head_show_box").hide(); $("#user_head_upload_box").show(); $("#user_head_origin").attr({ "src": "/Content/img/upload.png", "width": "100%", "height": "100%" }); } } }); }); </script>}后台代码：
[HttpPost] public ActionResult uploadHead(HttpPostedFileBase head)//命名和上传控件name 一样 { try { if ((head == null)) { return Json(new { msg = 0 }); } else { var supportedTypes = new[] { "jpg", "jpeg", "png", "gif","bmp" }; var fileExt = System.IO.Path.GetExtension(head.FileName).Substring(1); if (!supportedTypes.Contains(fileExt)) { return Json(new { msg = -1 }); } if (head.ContentLength > 1024 * 1000 * 10) { return Json(new { msg = -2 }); } Random r = new Random(); var filename = DateTime.Now.ToString("yyyyMMddHHmmss") + r.Next(10000) + "." + fileExt; var filepath = Path.Combine(Server.MapPath("~/avatar/temp"), filename); head.SaveAs(filepath); return Json(new { msg = filename }); } } catch (Exception) { return Json(new { msg = -3 }); } } [HttpPost] [ValidateInput(false)] public ActionResult saveHead() { UploadImageModel model = new UploadImageModel(); model.headFileName = Request.Form["headFileName"].ToString(); model.x = Convert.ToInt32(Request.Form["x"]); model.y = Convert.ToInt32(Request.Form["y"]); model.width = Convert.ToInt32(Request.Form["width"]); model.height = Convert.ToInt32(Request.Form["height"]); if ((model == null)) { return Json(new { msg = 0 }); } else { var filepath = Path.Combine(Server.MapPath("~/avatar/temp"), model.headFileName); string fileExt = Path.GetExtension(filepath); Random r = new Random(); var filename = DateTime.Now.ToString("yyyyMMddHHmmss") + r.Next(10000) + fileExt; var path180 = Path.Combine(Server.MapPath("~/avatar/180"), filename); var path75 = Path.Combine(Server.MapPath("~/avatar/75"), filename); var path50 = Path.Combine(Server.MapPath("~/avatar/50"), filename); var path25 = Path.Combine(Server.MapPath("~/avatar/25"), filename); cutAvatar(filepath, model.x, model.y, model.width, model.height, 75L, path180, 180); cutAvatar(filepath, model.x, model.y, model.width, model.height, 75L, path75, 75); cutAvatar(filepath, model.x, model.y, model.width, model.height, 75L, path50, 50); cutAvatar(filepath, model.x, model.y, model.width, model.height, 75L, path25, 25); return Json(new { msg = 1 }); } } /// <summary> /// 创建缩略图 /// </summary> public void cutAvatar(string imgSrc, int x, int y, int width, int height, long Quality, string SavePath, int t) { Image original = Image.FromFile(imgSrc); Bitmap img = new Bitmap(t, t, PixelFormat.Format24bppRgb); img.MakeTransparent(img.GetPixel(0, 0)); img.SetResolution(72, 72); using (Graphics gr = Graphics.FromImage(img)) { if (original.RawFormat.Equals(ImageFormat.Jpeg) || original.RawFormat.Equals(ImageFormat.Png)|| original.RawFormat.Equals(ImageFormat.Bmp)) { gr.Clear(Color.Transparent); } if (original.RawFormat.Equals(ImageFormat.Gif)) { gr.Clear(Color.White); } gr.InterpolationMode = InterpolationMode.HighQualityBicubic; gr.SmoothingMode = SmoothingMode.AntiAlias; gr.CompositingQuality = CompositingQuality.HighQuality; gr.PixelOffsetMode = PixelOffsetMode.HighQuality; gr.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit; using (var attribute = new System.Drawing.Imaging.ImageAttributes()) { attribute.SetWrapMode(WrapMode.TileFlipXY); gr.DrawImage(original, new Rectangle(0, 0, t, t), x, y, width, height, GraphicsUnit.Pixel, attribute); } } ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg"); if (original.RawFormat.Equals(ImageFormat.Jpeg)) { myImageCodecInfo = GetEncoderInfo("image/jpeg"); } else if (original.RawFormat.Equals(ImageFormat.Png)) { myImageCodecInfo = GetEncoderInfo("image/png"); } else if (original.RawFormat.Equals(ImageFormat.Gif)) { myImageCodecInfo = GetEncoderInfo("image/gif"); }else if (original.RawFormat.Equals(ImageFormat.Bmp)) { myImageCodecInfo = GetEncoderInfo("image/bmp"); } Encoder myEncoder = Encoder.Quality; EncoderParameters myEncoderParameters = new EncoderParameters(1); EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, Quality); myEncoderParameters.Param[0] = myEncoderParameter; img.Save(SavePath, myImageCodecInfo, myEncoderParameters); } //根据长宽自适应 按原图比例缩放 private static Size GetThumbnailSize(System.Drawing.Image original, int desiredWidth, int desiredHeight) { var widthScale = (double)desiredWidth / original.Width; var heightScale = (double)desiredHeight / original.Height; var scale = widthScale < heightScale ? widthScale : heightScale; return new Size { Width = (int)(scale * original.Width), Height = (int)(scale * original.Height) }; } private static ImageCodecInfo GetEncoderInfo(String mimeType) { int j; ImageCodecInfo[] encoders; encoders = ImageCodecInfo.GetImageEncoders(); for (j = 0; j < encoders.Length; ++j) { if (encoders[j].MimeType == mimeType) return encoders[j]; } return null; } }
前端脚本：
//原图/缩略图 的比例 >=1var UserHeadUtil = { ratio: 1, view_H:300, view_W:300, initialize:function(path){ $("#user_head_origin").attr("src", path); $("#user_head_upload_box").hide(); $("#user_head_show_box").show(); $("#user_head_25").attr("src", path); $("#user_head_50").attr("src", path); $("#user_head_75").attr("src", path); $("#user_head_180").attr("src", path); var img = new Image(); img.src = path; if(img.width==0){ var obj = this; img.onload = function(){ obj.imgOperate(img); }; }else{ this.imgOperate(img); } }, imgOperate:function(img){ if(img){ this.resize('user_head_origin', img.width, img.height, 300, 300); var x=0,y=0,size=0; if(this.view_W > this.view_H ){ x = (this.view_W - this.view_H)/2; size = this.view_H; }else if(this.view_W < this.view_H){ y = (this.view_H - this.view_W)/2; size = this.view_W; }else{ size = this.view_W; } var obj = this; $('img#user_head_origin').imgAreaSelect({ aspectRatio:"1:1", handles: "corners", persistent:true, show:true, imageWidth: obj.view_W, imageHeight: obj.view_H, x1: x, y1: y, x2: x + size, y2: y + size, onSelectChange: function(img, selection){ obj.preview('user_head_25', obj.view_W, obj.view_H, selection.x1, selection.y1, selection.width, selection.height, 25, 25); obj.preview('user_head_50', obj.view_W, obj.view_H, selection.x1, selection.y1, selection.width, selection.height, 50, 50); obj.preview('user_head_75', obj.view_W, obj.view_H, selection.x1, selection.y1, selection.width, selection.height, 75, 75); obj.preview('user_head_180', obj.view_W, obj.view_H, selection.x1, selection.y1, selection.width, selection.height, 180, 180); obj.setCutParams(selection.x1, selection.y1, selection.width, selection.height); } }); this.preview('user_head_25', this.view_W, this.view_H, x, y, size, size, 25, 25); this.preview('user_head_50', this.view_W, this.view_H, x, y, size, size, 50, 50); this.preview('user_head_75', this.view_W, this.view_H, x, y, size, size, 75, 75); this.preview('user_head_180', this.view_W, this.view_H, x, y, size, size, 180, 180); this.setCutParams(x, y, size, size); } }, resize:function(id, width, height, limit_W, limit_H){ if(width>0 && height>0){ if(width/height >= limit_W/limit_H){ if(width > limit_W){ this.view_W = limit_W; this.view_H = (limit_W/width)*height; } }else{ if(height > limit_H){ this.view_H = limit_H; this.view_W = (limit_H/height)*width; } } $('#'+id).attr( { "width" : this.view_W, "height" : this.view_H }); this.ratio = width / this.view_W; } }, preview:function(id, width, height, x, y, cut_W, cut_H, show_W, show_H){ var scaleX = show_W / (cut_W * this.ratio || 1); var scaleY = show_H / (cut_H * this.ratio || 1); $('#'+id).css({ width: Math.round(scaleX * width * this.ratio) + 'px', height: Math.round(scaleY * height * this.ratio) + 'px', marginLeft: '-' + Math.round(scaleX * x * this.ratio) + 'px', marginTop: '-' + Math.round(scaleY * y * this.ratio) + 'px' }); }, setCutParams:function(x, y, width, height){ $('#head_x').val(Math.round(x * this.ratio)); $('#head_y').val(Math.round(y * this.ratio)); $('#head_width').val(Math.round(width * this.ratio)); $('#head_height').val(Math.round(height * this.ratio)); }};function cancelHead(){// window.location.reload(); $('img#user_head_origin').imgAreaSelect({ remove: true }); $("#user_head_show_box").hide(); $("#user_head_upload_box").show(); $("#user_head_origin").attr({ "src": "/Content/img/upload.png", "width" : "100%", "height" : "100%" }); var path = $("img#origin_user_head_75").attr("src"); var index = path.lastIndexOf("/"); if(index!=-1){ var name = path.substring(index+1); $("#user_head_25").attr("src", "/headphone/25/"+name).css({ width: 25 + 'px', height: 25 + 'px', marginLeft: 0, marginTop: 0 }); $("#user_head_50").attr("src", "/headphone/50/" + name).css({ width: 50 + 'px', height: 50 + 'px', marginLeft: 0, marginTop: 0 }); $("#user_head_75").attr("src", "/headphone/75/" + name).css({ width: 75 + 'px', height: 75 + 'px', marginLeft: 0, marginTop: 0 }); $("#user_head_180").attr("src", "/headphone/180/" + name).css({ width: 180 + 'px', height: 180 + 'px', marginLeft: 0, marginTop: 0 }); }}
下载地址：
CSDN： http://download.csdn.net/download/zengzhan/5109105
BAIDU share：http://pan.baidu.com/share/link?shareid=389586&uk=2735096069
更多关于多种文件上传，分类到这里 http://www.cnblogs.com/zengxiangzhan/category/269831.html
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