var swfu;

         window.onload = function () {

             swfu = new SWFUpload({

                 // Backend Settings

                 upload_url: "/Image/upload", //提交上传的url

                 post_params: {

                     "ASPSESSID": "@Session.SessionID" //SessionID很重要，如果没有SessionID将无法上传，并且加载页面时Button都不会显示

                 },

                 // 上传文件设置

                 file_size_limit: "2 MB", //大小

                 file_types: "*.jpg",//格式

                 file_types_description: "JPG Images",

                 file_upload_limit: 0,    // Zero means unlimited

                 //一系列事件 默认事件在Handler.js文件内

                 swfupload_preload_handler: preLoad,

                 swfupload_load_failed_handler: loadFailed,

                 file_queue_error_handler: fileQueueError,

                 file_dialog_complete_handler: fileDialogComplete,

                 upload_progress_handler: uploadProgress,//上传过程

                 upload_error_handler: uploadError,//上传异常

                 upload_success_handler: cutImage, //上传成功

                 upload_complete_handler: uploadComplete,

                 // Button样式相关设置

                 button_image_url: '@Url.Content("~/Content/js/swfuploadv250/images/XPButtonNoText_160x22.png")',

                 button_placeholder_id: "spanButtonPlaceholder",//Button按钮ID

                 button_width: 160,

                 button_height: 22,

                 button_text: '<span class="button">上传图片 <span class="buttonSmall">(2 MB Max)</span></span>',

                 button_text_style: '.button { font-family: Helvetica, Arial, sans-serif;color:red; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',

                 button_text_top_padding: 1,

                 button_text_left_padding: 5,

                 // Flash文件(swfupload.swf) 路径设置

                 flash_url: '@Url.Content("~/Content/js/swfuploadv250/swfupload.swf")',

                 flash9_url: '@Url.Content("~/Content/js/swfuploadv250/swfupload_fp9.swf")',

                 custom_settings: {

                     upload_target: "divFileProgressContainer"  //展示信息框 的id

                 },

                 // 是否开启调试

                 debug: false

             });

  //截图图片

             $("#btnCut").click(function () {

                 var $cut = $("#divCut");

                 var $divImg = $("#divImg");

                 var x = $cut.offset().left-$divImg.offset().left; //横坐标

                 var y = $cut.offset().top-$divImg.offset().left;//纵坐标

                 var width = $cut.width();//宽度

                 var height = $cut.height();//高度

                 //发送数据到服务端

                 $.post("/Image/ImageCut", { "x": parseInt(x), "y": parseInt(y), "width": parseInt(width), "height": parseInt(height), "imgUrl": imgUrl },

                     function (data) {

                         $("#divImg").hide();

                         $("#cutImg").attr("src", data);

                     })

             })

服务端代码

 public ActionResult ImageCut(FormCollection form)

         {

             //1:接受参数

             int x = int.Parse(form["x"]);

             int y = int.Parse(form["y"]);

             int width = int.Parse(form["width"]);

             int height = int.Parse(form["height"]);

             string imgUrl = form["imgUrl"];

             string imgPath = string.Empty;

             using (Bitmap map = new Bitmap(width, height))//创建图片的大小与要截取图像的大小一致

             {

                 using (Graphics g = Graphics.FromImage(map))

                 {

                     //将之前上传的图片转成Image

                     using (Image img = Image.FromFile(Request.MapPath(imgUrl)))

                     {

                                                 // 操作的图，    要画大小，   画哪一块， 度量单位

                         g.DrawImage(img, new Rectangle(, , width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);

                         imgPath = "../Images/cuttemp.jpg";

                         map.Save(Request.MapPath(imgPath));//将BitMap保存

                     }

                 }

             }

             return Content(imgPath);

         }