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                         由于代码很简单,这里就闲话不多说了,直接上代码,小伙伴们自己研读代码就明白了。 
前台代码:  
复制代码 代码如下: 
/*修改头像*/   
    //上传   
    function _sc() {   
        $(".ckfile").html("").css("color","#535353");   
        $("#_userImgPath").val("");   
        var str = $("#file").val();   
        if ($.trim(str) == "") {   
            $(".ckfile").html("请选择文件。").css("color","red");   
            return false;   
        }   
        else {   
            var postfix = str.substring(str.lastIndexOf(".") + 1).toUpperCase();   
            if (postfix == "JPG" || postfix == "JPEG" || postfix == "PNG" || postfix == "GIF" || postfix == "BMP") {   
                $('#showimg').attr('src','Images/loading.gif').attr("title","上传中,请稍后…");   
                var path = "Upload/UserImg";   
                $.ajaxFileUpload({   
                    url: '/Upload.aspx?path=Upload|UserImg&shape=100*100',   
                    secureuri: false,   
                    fileElementId: 'file',   
                    dataType: 'text',   
                    success: function (msg) {   
                        if (msg.lastIndexOf(path) == -1) {   
                            $(".ckfile").html(msg).css("color","red");   
                        }   
                        else {   
                            $('#showimg').attr('src',msg).attr("title","我的头像");   
                            $("#_userImgPath").val(msg);   
                        }   
                    }   
                });   
            } else {   
                $(".ckfile").html("文件格式错误。").css("color","red");   
                return false;   
            }   
        }   
    }   
 
后台代码: 
复制代码 代码如下: 
using System;   
using System.Collections.Generic;   
using System.Linq;   
using System.Web;   
using System.Web.UI;   
using System.Web.UI.WebControls;   
using SS.Upload;   
using WFC.Fenxiao;   
namespace wanfangcheng   
{   
    public partial class Upload : BasePage   
    {   
        //文件大小 1024 kb   
        private long size = 1024;   
        //文件类型   
        private string type = ".jpg|.jpeg|.png|.gif|.bmp";   
        //保存名称   
        string name = "";   
        //保存路径   
        private string path = @"Upload/UserImg";   
        //保存大小   
        private string shape = "100*100";   
        protected void Page_Load(object sender,EventArgs e)   
        {   
            HttpFileCollection files = Request.Files;   
            if (files != null && files.Count > 0)   
            {   
                name = BaseRole.Instance.UserId.ToString();   
                if (Request.QueryString["size"] != null)   
                {   
                    size = Convert.ToInt32(Request.QueryString["size"]);   
                }   
                if (Request.QueryString["path"] != null)   
                {   
                    path = Request.QueryString["path"].ToString().Trim().Replace('|','/');   
                }   
                if (Request.QueryString["name"] != null)   
                {   
                    name = Request.QueryString["name"].ToString().Trim();   
                }   
                if (Request.QueryString["shape"] != null)   
                {   
                    shape = Request.QueryString["shape"].ToString().Trim();   
                }   
                uploadMethod(files);   
            }   
        }   
        /// <summary>   
        /// 上传图片   
        /// </summary>   
        /// <param name="hc"></param>   
        public void uploadMethod(HttpFileCollection hc)   
        {   
            HttpPostedFile _file = hc[0];   
            //文件大小   
            long _size = _file.ContentLength;   
            if (_size <= 0)   
            {   
                Response.Write("文件错误。");   
                Response.End();   
                return;   
            }   
            if (size * 1024 < _size)   
            {   
                Response.Write("文件过大,最大限制为" + size + "KB。");   
                Response.End();   
                return;   
            }   
            //文件名   
            string _name = _file.FileName;   
            //文件格式   
            string _tp = System.IO.Path.GetExtension(_name).ToLower();   
            if (type.IndexOf(_tp) == -1)   
            {   
                Response.Write("文件格式错误。");   
                Response.End();   
                return;   
            }   
            //保存路径   
            string _path = HttpContext.Current.Server.MapPath(path) + @"/" + name + _tp;   
            try   
            {   
                int w = Convert.ToInt32(shape.Split('*')[0]);   
                int h = Convert.ToInt32(shape.Split('*')[1]);   
                ImageHelper.CutForCustom(_file,_path,w,h,50);   
                Response.Write(path + @"/" + name + _tp);   
            }   
            catch (Exception)   
            {   
                Response.Write("哎呦,出错了。");   
                Response.End();   
            }   
        }   
    }   
}   
 
是不是很实用,也很简单易懂呢,以上是自己项目中使用的代码,小伙伴们如果发现有问题的地方,还请告之。谢谢                         (编辑:莱芜站长网) 
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