正好项目用到上传+剪裁功能，发上来便于以后使用。
我不能告诉你们其实是从博客园扒的前台代码，哈哈。
前端是jquery+fineuploader+jquery.Jcrop
后台是asp.net mvc 4
核心的js调用代码是crop.js和helper文件夹下的ImgHandler.cs
效果图
前台代码
<link href="~/Content/fineuploader.css" rel="stylesheet" />
<link href="~/Content/jquery.Jcrop.min.css" rel="stylesheet" />
<link href="~/Content/crop.min.css" rel="stylesheet" />
<script src="~/Scripts/jquery-1.8.2.min.js"></script>
<script src="~/Scripts/jquery.fineuploader-3.1.min.js"></script>
<script src="~/Scripts/jquery.Jcrop.min.js"></script>
<script src="~/Scripts/crop.js"></script> <div id="jquery-wrapped-fine-uploader"></div>
<div id="message"></div>
<div id="crop_wrap">
<div id="crop_holder">
<div id="crop_area" class="border">
<img id="crop_image" alt="" src="" class="preview-image" style="display: none" />
</div>
<div id="preview_area">
<div id="preview_title">当前头像</div>
<div id="preview_large_text" class="preview-text">180px × 180px</div>
<div id="preview_large_wrap" class="border">
<img id="preview_large" alt="" src="@ViewBag.Path" class="preview-image" style=""/></div>
</div>
</div>
<div id="crop_operation" style="display: none;">
<form id="form_crop" action="/home/index" method="post">
<input type="hidden" name="x" id="x">
<input type="hidden" name="y" id="y">
<input type="hidden" name="w" id="w">
<input type="hidden" name="h" id="h">
<input type="hidden" name="imgsrc" id="imgsrc">
<input id="crop_operation_submit" type="submit" value="裁切并保存" /><span id="crop_operation_msg" style="display: none" class="green"></span>
</form>
</div>
<div id="croped_message" class="green"></div>
</div>
后台代码
public ActionResult Index()
{
return View();
} /// <summary>
/// 保存缩略图
/// </summary>
/// <param name="form"></param>
/// <returns></returns>
[HttpPost]
public ActionResult Index(FormCollection form)
{
int x = Convert.ToInt32(form["x"]);
int y = Convert.ToInt32(form["y"]);
int w = Convert.ToInt32(form["w"]);
int h = Convert.ToInt32(form["h"]);
string imgsrc = form["imgsrc"].Substring(0, form["imgsrc"].LastIndexOf("?"));
string path = ImgHandler.CutAvatar(imgsrc, x, y, w, h); //保存Path
ViewBag.Path = path;
return View();
} /// <summary>
/// 上传头像
/// </summary>
/// <param name="qqfile"></param>
/// <returns></returns>
[HttpPost]
public ActionResult ProcessUpload(string qqfile)
{
try
{
string uploadFolder = "/Upload/original/" + DateTime.Now.ToString("yyyyMM") + "/";
string imgName = DateTime.Now.ToString("ddHHmmssff");
string imgType = qqfile.Substring(qqfile.LastIndexOf("."));
string uploadPath = "";
uploadPath = Server.MapPath(uploadFolder);
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
using (var inputStream = Request.InputStream)
{
using (var flieStream = new FileStream(uploadPath + imgName + imgType, FileMode.Create))
{
inputStream.CopyTo(flieStream);
}
} return Json(new { success = true, message = uploadFolder + imgName + imgType });
}
catch (Exception e)
{
return Json(new { fail = true, message = e.Message });
}
}