<link href="http://www.cnblogs.com/Content/jquery.Jcrop.css" rel="stylesheet" type="text/css" />
<script src="http://www.cnblogs.com/Content/jquery-1.7.1.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/Content/ajaxfileupload.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/Content/jquery.Jcrop.js" type="text/javascript"></script><script type="text/javascript">$(function () {$(":button").click(function () {//当点击上传按钮时，AJAX上传图片到服务器ajaxFileUpload();})})//当裁剪框变动时，将左上角相对图片的X坐标与Y坐标，宽度以及高度放到<input type="hidden">中(上传到服务器上裁剪会用到)function showCoords(c) {$("#p1").text(c.x + "   " + c.y + "   " + c.w + "   " + c.h );$("#x1").val(c.x);$("#y1").val(c.y);$("#cw").val(c.w);$("#ch").val(c.h);}//当AJAX上传图片操作function ajaxFileUpload() {$.ajaxFileUpload({url: '/uploadandcut/upload?action=up', //用于文件上传的服务器端请求地址up参数标记此次是上传操作还是裁剪操作secureuri: false, //一般设置为false，是否安全上传fileElementId: 'file1', //文件上传控件的id属性  <input type="file" id="file" name="file" />dataType: 'json', //返回值类型 一般设置为json 期望服务器传回的数据类型success: function (data, status)  //服务器成功响应处理函数{//上传成功后在将服务器上刚刚上传的图片显示在img1上$("#img1").attr("src", data.imgurl);if (typeof (data.error) != 'undefined') {if (data.error != '') {alert(data.error);} else {alert(data.msg);}}//同时启动裁剪操作，触发裁剪框显示，让用户选择图片区域$("#img1").Jcrop({bgColor: 'black',bgOpacity: .4,setSelect: [100, 100, 150,150],  //设定4个角的初始位置aspectRatio: 1 / 1,onChange: showCoords,   //当裁剪框变动时执行的函数onSelect: showCoords,   //当选择完成时执行的函数});},error: function (data, status, e)//服务器响应失败处理函数{alert(e);}})return false;}</script><div><p><input type="file" id="file1" name="file" /></p><input type="button" value="上传" /><p><img id="img1" alt="上传成功啦!" src="" /></p><p id="p1"></p><form id="FaceUpload" name="FaceUpload" method="post" enctype="multipart/form-data" action="/uploadandcut/Upload?action=cut"><input type="hidden" id="x1" name="x1" value="0" /><input type="hidden" id="y1" name="y1" value="0" /><input type="hidden" id="cw" name="cw" value="0" /><input type="hidden" id="ch" name="ch" value="0" /><input type="submit" value="裁剪上传" /></form></div>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Drawing;namespace UploadAndCut.Controllers
{public class UploadAndCutController : Controller{/// <summary>/// 打开页面/// </summary>/// <returns></returns>public ActionResult Index(){return View();}/// <summary>/// 上传操作，包括提交表单与AJAX上传图片/// </summary>/// <returns></returns>public ActionResult Upload(){string action = HttpContext.Request.QueryString["action"];//判断用户的操作类型switch (action.ToLower()){#region 当为上传图片操作时case "up":foreach (string upload in Request.Files){if (!Request.Files[upload].HasFile()){continue;}string ExtensionName = Path.GetExtension(Request.Files[upload].FileName).ToLower();if (ExtensionName != ".jpg" && ExtensionName != ".png" && ExtensionName != ".gif" && ExtensionName != ".bmp"){return Redirect("/Tips/tip?error=您上传的图片不符合格式!");}string ImgPath = Server.MapPath("/uploads/" + "img" + ExtensionName);Request.Files[upload].SaveAs(ImgPath);}string error = "";string msg = "上传成功";string imgurl = "/uploads/img.jpg";string res = "{ error:'" + error + "', msg:'" + msg + "',imgurl:'" + imgurl + "'}";return Content(res);break;#endregion#region 当为裁剪图片操作时case "cut":string strx1 = HttpContext.Request.Form["x1"];string stry1 = HttpContext.Request.Form["y1"];string strcw = HttpContext.Request.Form["cw"];string strch = HttpContext.Request.Form["ch"];int intx1 = Convert.ToInt32(strx1);int inty1 = Convert.ToInt32(stry1);int intcw = Convert.ToInt32(strcw);int intch = Convert.ToInt32(strch);Stream imgStream = GetLocalStream(Server.MapPath("/uploads/" + "img.jpg"));//System.Drawing.Image initImage = System.Drawing.Image.FromStream(imgStream);Cut(imgStream, Server.MapPath("/uploads/img.jpg"), intx1, inty1, intcw, intch, 100);return Redirect("/uploadandcut/index");break;#endregiondefault:return null;break;}}/// <summary>/// 将一个文件读成字符流/// </summary>/// <param name="InFilePath"></param>/// <returns></returns>public static Stream GetLocalStream(string InFilePath){return new MemoryStream(ReadFileReturnBytes(InFilePath));}/// <summary>从文件中读取二进制数据</summary>/// <param name="filePath">文件路径</param>/// <returns> byte[]二进制数据</returns>public static byte[] ReadFileReturnBytes(string filePath){FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);BinaryReader br = new BinaryReader(fs);byte[] buff = br.ReadBytes((int)fs.Length);br.Close();fs.Close();return buff;}#region 裁剪操作public static void Cut(System.IO.Stream fromFile, string fileSaveUrl, int xPosition, int yPosition, int width, int height, int quality){//创建目录//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);//原始图片的宽、高int initWidth = initImage.Width;int initHeight = initImage.Height;if (xPosition + width > initWidth)width = initWidth - xPosition;if (yPosition + height > initHeight)height = initHeight - yPosition;//与原图相等直接保存if ((width >= initWidth && height >= initHeight) || (width < 1 && height < 1)){initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);}else{System.Drawing.Image pickedImage = null;System.Drawing.Graphics pickedG = null;//对象实例化pickedImage = new System.Drawing.Bitmap(width, height);pickedG = System.Drawing.Graphics.FromImage(pickedImage);//设置质量pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//定位System.Drawing.Rectangle fromR = new System.Drawing.Rectangle(xPosition, yPosition, width, height);System.Drawing.Rectangle toR = new System.Drawing.Rectangle(0, 0, width, height);//画图pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);//关键质量控制//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiffSystem.Drawing.Imaging.ImageCodecInfo[] icis = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();System.Drawing.Imaging.ImageCodecInfo ici = null;foreach (System.Drawing.Imaging.ImageCodecInfo i in icis){if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif"){ici = i;}}System.Drawing.Imaging.EncoderParameters ep = new System.Drawing.Imaging.EncoderParameters(1);ep.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);//保存缩略图pickedImage.Save(fileSaveUrl, ici, ep);//释放关键质量控制所用资源ep.Dispose();//释放截图资源pickedG.Dispose();pickedImage.Dispose();//释放原始图片资源initImage.Dispose();}}#endregion}
}