上传头图片带预览剪切NET版-兼容大部分浏览器

浏览数：17 / 时间：2015年06月09日

1.上传页面WebForm2.aspx.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="WebApplication2.WebForm2" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <script src="jquery.min.js"></script>
    <script src="ajaxupload.js"></script>
    <script src="jquery.imgareaselect.min.js"></script>
    <script src="jquery.imgareaselect.pack.js"></script>
    <link href="imgareaselect-default.css" rel="stylesheet" />

</head>
<body>
    <form id="form1" runat="server">
        <input id="med" type="text" />
        上传图片：<input type="text" id="txtFileName" /><div id="btnUp" style="width: 300px;" class="btnsubmit">浏览</div>
         <div style=" width:200px; height:300px; float: left;">
              <input type="button" id="btnCut" value="进行裁剪" />

        <img id="picTest" alt="鼠标选中图表某个区域进行裁剪" title="鼠标选中图表某个区域进行裁剪" /></div>

        
        <div id="divNewPic" style="margin-left:500px">
            <img id="showPicture" />
        </div>
    </form>
    <script type="text/javascript">
        //定义几个全局变量用于记录图片选择区域的左上角角和右下角两个点的x和y坐标
        var x1 = 0, y1 = 0, x2 = 0, y2 = 0;
        $(document).ready(function () {
            //页面初始化时监听某个图片对象的鼠标区域选择事件
            $(‘#picTest‘).imgAreaSelect({
                onSelectEnd: function (img, selection) {
                    x1 = selection.x1;
                    y1 = selection.y1;
                    x2 = selection.x2;
                    y2 = selection.y2;
                }
            });
            //给页面button按钮绑定事件
            $("#btnCut").click(function () {
                $("#showPicture").remove();
                $("#divNewPic").hide();
                ImgAreaSelectCut();
                //$("<img />").remove($(‘#divNewPic‘));
            });
            var button = $(‘#btnUp‘), interval;
            new AjaxUpload(button, {
                action: ‘Handler.ashx‘,
                name: ‘myfile‘,
                onSubmit: function (file, ext) {
                    if (!(ext && /^(jpg|jpeg|JPG|JPEG)$/.test(ext))) {
                        alert(‘图片格式不正确,请选择 jpg 格式的文件!‘, ‘系统提示‘);
                        if (navigator.userAgent.indexOf("MSIE") > 0) {
                            $("#med").attr("value", "");
                        }
                            $("#med").val(‘‘);
                            $("#picTest").attr("src", "");
                        return false;
                    }
                },
                onComplete: function (file, response) {
                    //file 本地文件名称，response 服务器端传回的信息
                    var k = response.replace("<pre>", "").replace("</pre>", "");
                    if (k == ‘-1‘) {
                        alert(‘您上传的文件太大啦!请不要超过150K‘);
                        $("#picTest").attr("src", "");
                        $("#med").val(‘‘);
                        if (navigator.userAgent.indexOf("MSIE") > 0) {
                            $("#med").attr("value", "");
                        }
                    }
                    else {
                        $("#med").val(k);
                        $("#picTest").attr("src", k);
                    }
                }
            });
        });

        //通过Ajax异步提交相关裁剪数据至后台服务接收裁剪后的图片地址并将其显示在页面某个div容器内
        function ImgAreaSelectCut() {

            $.ajax({
                url: "ImageSelectCutService.aspx?dateTime=" + new Date().toString(),
                dataType: "json", //返回数据格式为json
                async: false, //异步提交数据
                data: "&x1=" + x1 + "&y1=" + y1 + "&x2=" + x2 + "&y2=" + y2+"&filename="+document.getElementById("med").value,
                success: function (data) {
                    if (data) {
                        if (data.state = 0) {
                            alert(data.msg);
                        } else {
                            $("#divNewPic").show();
                            var newPicPath = data.msg;
                            if (navigator.userAgent.indexOf("MSIE") > 0)
                            {
                                document.getElementById("showPicture").src = newPicPath;
                            }
                            //document.getElementById("showPicture").setAttribute("src", "");
                            //document.getElementById("showPicture").setAttribute("src", newPicPath);
                            $("#divNewPic").html("<img id=‘showPicture‘ src=‘" + newPicPath + "‘/>");
                          // $("<img id=‘showPicture‘ />").appendTo($(‘#divNewPic‘)).attr("src", newPicPath);
                            $("#showPicture").attr("src", "");
                            $("#showPicture").attr("src", newPicPath);
                        }
                    }
                },
                error: function (msg) {
                    alert(msg);
                }
            });
        }
    </script>
</body>
</html>

2,上传处理页面Handler.ashx

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Web;

namespace WebApplication2
{
    /// <summary>
    /// Handler 的摘要说明
    /// </summary>
    public class Handler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";

string url = context.Request["med"];

            HttpPostedFile postedFile = context.Request.Files[0];
            string savePath = "/images/";
            int filelength = postedFile.ContentLength;
            string filename = postedFile.FileName;
            int fileSize = 163600; //150K
            string fileName = ""; //返回的上传后的文件名
            if (filelength <= fileSize)
            {

byte[] buffer = new byte[filelength];

postedFile.InputStream.Read(buffer, 0, filelength);

                fileName = UploadImage(buffer, savePath, "jpg", url);
                //fileName = UploadImage(buffer, savePath, filename, url);
            }
            else
            {
                fileName = "-1";
            }
            //fileName = fileName +","+ url;
            context.Response.Write(fileName);
        }

        public static string UploadImage(byte[] imgBuffer, string uploadpath, string ext, string url)
        {
            try
            {
                System.IO.MemoryStream m = new MemoryStream(imgBuffer);

if (!Directory.Exists(HttpContext.Current.Server.MapPath(uploadpath)))
Directory.CreateDirectory(HttpContext.Current.Server.MapPath(uploadpath));

                if (File.Exists(url))
                {
                    //如果存在则删除
                    File.Delete(url);
                }

string imgname = CreateIDCode() + "." + ext;

string _path = HttpContext.Current.Server.MapPath(uploadpath) + imgname;

                Image img = Image.FromStream(m);
                img.Save(_path);
                if (ext == "jpg")
                    img.Save(_path, System.Drawing.Imaging.ImageFormat.Jpeg);
                else
                    img.Save(_path, System.Drawing.Imaging.ImageFormat.Gif);
                m.Close();

                return uploadpath + imgname;
                // return _path;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }

}

        public static string CreateIDCode()
        {
            DateTime Time1 = DateTime.Now.ToUniversalTime();
            DateTime Time2 = Convert.ToDateTime("1970-01-01");
            TimeSpan span = Time1 - Time2;   //span就是两个日期之间的差额
            string t = span.TotalMilliseconds.ToString("0");

return t;
}

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

3,在线切割生成缩略图页面ImageSelectCutService.aspx

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
    public partial class ImageSelectCutService : System.Web.UI.Page
    {

        #region 参数定义
        /// <summary>
        /// 两个坐标点的x和y坐标值
        /// </summary>
        public int x1, y1, x2, y2;

        public string picPath = "";
        public string newPicPath = "/images/new/new.jpg";
        #endregion

        protected void Page_Load(object sender, EventArgs e)
        {
            #region 获取参数
            picPath = Request.QueryString["filename"];
            string[] temp = picPath.Split(‘/‘);
            newPicPath = "/images/new/" + temp[2];
            x1 = string.IsNullOrEmpty(Request["x1"]) ? 0 : Convert.ToInt32(Request["x1"]);
            y1 = string.IsNullOrEmpty(Request["y1"]) ? 0 : Convert.ToInt32(Request["y1"]);
            x2 = string.IsNullOrEmpty(Request["x2"]) ? 0 : Convert.ToInt32(Request["x2"]);
            y2 = string.IsNullOrEmpty(Request["y2"]) ? 0 : Convert.ToInt32(Request["y2"]);

            ///裁剪图片
            CutImage(picPath, newPicPath, x1, y1, x2, y2);
            #endregion
        }

        private void CutImage(string picPath, string newPicPath, int x1, int y1, int x2, int y2)
        {
            string returnJson = "";
            //获取所选区域的高宽值
            int width = x2 - x1;
            int height = y2 - y1;
            try
            {
                ///将图片文件字节化
                Bitmap bm = new Bitmap(Server.MapPath(picPath));
                //处理JPG质量的函数
                ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo ici = null;
                foreach (ImageCodecInfo codec in codecs)
                {
                    if (codec.MimeType == "image/jpeg")
                    {
                        ici = codec;
                        break;
                    }
                }
                int level = 100; //图片质量

EncoderParameters ep = new EncoderParameters();
ep.Param[0] = new EncoderParameter(Encoder.Quality, (long)level);

                // 裁剪图片
                Rectangle cloneRect = new Rectangle(x1, y1, width, height);
                PixelFormat format = bm.PixelFormat;
                Bitmap cloneBitmap = bm.Clone(cloneRect, format);
                //保存图片
                cloneBitmap.Save(Server.MapPath(newPicPath), ici, ep);
                cloneBitmap.Dispose();
                bm.Dispose();
                returnJson = "{\"state\":\"0\",\"msg\":\"" + newPicPath + "\"}";
            }
            catch (Exception e)
            {
                returnJson = "{\"state\":\"1\",\"msg\":\"" + e.Message + "\"}";
            }
            Response.Write(returnJson);
            Response.End();
        }
    }
}