Asp.Net无刷新上传并裁剪头像(用Jquery插件 Uploadify实现) 附完整源码

【实例简介】

用jquery插件 Uploadify实现无刷新上传头像，并可裁剪图片大小， 官方网站详见:http://www.uploadify.com/

常用方法有：

【实例截图】

【核心代码】

<%@ WebHandler Language="C#" Class="CutAvatarHandler" %>

using System;
using System.Web;
using System.Web.SessionState;

public class CutAvatarHandler : IHttpHandler, IRequiresSessionState
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        context.Response.Charset = "utf-8";

        System.Drawing.Bitmap bitmap = null;   //按截图区域生成Bitmap
        System.Drawing.Image thumbImg = null;      //被截图 
        System.Drawing.Graphics gps = null;    //存绘图对象   
        System.Drawing.Image finalImg = null;  //最终图片


        try
        {
            string pointX = context.Request.Params["pointX"];   //X坐标
            string pointY = context.Request.Params["pointY"];   //Y坐标
            string imgUrl = context.Request.Params["imgUrl"];   //被截图图片地址
            string rlSize = context.Request.Params["maxVal"];        //截图矩形的大小

            int finalWidth = 100;
            int finalHeight = 100;

            if (!string.IsNullOrEmpty(pointX) && !string.IsNullOrEmpty(pointY) && !string.IsNullOrEmpty(imgUrl))
            {

                string ext = System.IO.Path.GetExtension(imgUrl).ToLower();   //上传文件的后缀（小写）

                bitmap = new System.Drawing.Bitmap(Convert.ToInt32(rlSize), Convert.ToInt32(rlSize));

                thumbImg = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(imgUrl));

                System.Drawing.Rectangle rl = new System.Drawing.Rectangle(Convert.ToInt32(pointX), Convert.ToInt32(pointY), Convert.ToInt32(rlSize), Convert.ToInt32(rlSize));   //得到截图矩形

                gps = System.Drawing.Graphics.FromImage(bitmap);      //读到绘图对象

                gps.DrawImage(thumbImg, 0, 0, rl, System.Drawing.GraphicsUnit.Pixel);

                finalImg = PubClass.GetThumbNailImage(bitmap, finalWidth, finalHeight);

                string finalPath = "/User/final"   DateTime.Now.ToFileTime()   ext;

                finalImg.Save(HttpContext.Current.Server.MapPath(finalPath));

                bitmap.Dispose();
                thumbImg.Dispose();
                gps.Dispose();
                finalImg.Dispose();
                GC.Collect();

                PubClass.FileDel(HttpContext.Current.Server.MapPath(imgUrl));

                context.Response.Write(finalPath);
            }
        }
        catch (Exception)
        {
            throw;
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}