周末大放送网站图片上传，水印，预览，截图-阿里云开发者社区

周末闲着没事，将网站中经常用到的对图片的操作做了一个总结，方便以后回顾，这里将一天的成果，贴出来，希望能帮到大家。

首先是swfupload方式的无刷新上传，关于怎么配置，按照demo 的写法，我相信只要你不是太笨，都能成功。

关于swfupload你可以去网上下，也可以点这里下载：SWFUpload_v250_beta_3_samples.rar

项目结构：

上传代码：

前台上传页面，你可以根据需要建html页，也可以建webform。这里用一般处理程序来对照片进行处理，加水印，修改文件名等操作。

    
   
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SWFUploadImage.aspx.cs" Inherits="Wolfy.ImageWeb.SWFUploadImage" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
   <title></title>
   <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
   <script src="../SWFUpload/swfupload.js" type="text/javascript"></script>
   <script src="../SWFUpload/handlers.js" type="text/javascript"></script>
   <script src="../Script/jquery-1.7.1.js"></script>
   <script type="text/javascript">
       var swfu;
       window.onload = function () {
           swfu = new SWFUpload({
               // Backend Settings
               upload_url: "/SWFUploadHandler.ashx",//交给一般处理程序来处理
               post_params: {
                   "ASPSESSID": "<%=Session.SessionID %>"
               },

               // File Upload Settings
               file_size_limit: "2 MB",
               file_types: "*.jpg;*.gif",
               file_types_description: "JPG Images",
               file_upload_limit: 0,    // Zero means unlimited

               // Event Handler Settings - these functions as defined in Handlers.js
               //  The handlers are not part of SWFUpload but are part of my website and control how
               //  my website reacts to the SWFUpload events.
               swfupload_preload_handler: preLoad,
               swfupload_load_failed_handler: loadFailed,
               file_queue_error_handler: fileQueueError,
               file_dialog_complete_handler: fileDialogComplete,
               upload_progress_handler: uploadProgress,
               upload_error_handler: uploadError,
               upload_success_handler: Show,//这里修改了方法的定义。
               upload_complete_handler: uploadComplete,

               // Button settings
               button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png",
               button_placeholder_id: "spanButtonPlaceholder",
               button_width: 160,
               button_height: 22,
               button_text: '<span class="button">选择上传图片 <span class="buttonSmall">(2 MB Max)</span></span>',
               button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
               button_text_top_padding: 1,
               button_text_left_padding: 5,

               // Flash Settings
               flash_url: "/SWFUpload/swfupload.swf", // Relative to this file
               flash9_url: "/SWFUpload/swfupload_FP9.swf", // Relative to this file

               custom_settings: {
                   upload_target: "divFileProgressContainer"
               },

               // Debug Settings
               debug: false
           });
       }
       //上传成功以后执行该方法
       function Show(file, serverData) {
           var s = serverData.split(':');//接收从服务端返回的数据，按照分号分隔

           if (s[0] == "ok") {
               $("#imgSrc").attr("src", s[1]);
           }
       }
   </script>
</head>
<body>
   <form id="form1" runat="server">
       
       <div id="content">

           <div id="swfu_container" style="margin: 0px 10px;">
               <div>

                   <span id="spanButtonPlaceholder"></span>

               </div>

               <div id="divFileProgressContainer" style="height: 75px;"></div>

               <img id="imgSrc" />
           </div>
       </div>
   </form>
</body>
</html>
    
   

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

namespace Wolfy.ImageWeb
{
   /// <summary>
   /// SWFUploadHandler 的摘要说明
   /// </summary>
   public class SWFUploadHandler : IHttpHandler
   {

       public void ProcessRequest(HttpContext context)
       {
           context.Response.ContentType = "text/plain";
           HttpPostedFile file = context.Request.Files["Filedata"];//获取上传的文件数据.
           string fileName = Path.GetFileName(file.FileName);//获取上传文件的名称.
           string fileExt = Path.GetExtension(fileName);//得到文件的扩展名.

           if (fileExt == ".jpg")
           {
               //将上传的图片放到不同的文件夹下.(根据日期)
               string dir = "/UploadImage/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/";
               Directory.CreateDirectory(Path.GetDirectoryName(context.Server.MapPath(dir)));//创建文件夹.
               //文件重命名名字
               string fullDir = dir + DateTime.Now.ToString("yyyyMMddhhmmss") + fileExt;//构建完整的文件路径.
               file.SaveAs(context.Server.MapPath(fullDir));
               context.Response.Write("ok:" + fullDir);


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

预览和截图，水印代码(这里将他们整合在一个页面了，实在不想再建页面，在配置swfupload)，截图的时候，用到网上的一个jquery插件（可变层，可移动层）

    
   
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CutPhoto.aspx.cs" Inherits="Wolfy.ImageWeb.CutPhoto1" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
   <title></title>
   <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
   <script src="../SWFUpload/swfupload.js" type="text/javascript"></script>
   <script src="../SWFUpload/handlers.js" type="text/javascript"></script>
   <script src="../Script/jquery-1.7.1.js"></script>
   <script src="Script/jquery-ui-1.8.2.custom.min.js"></script>
   <script type="text/javascript">
       var swfu;
       window.onload = function () {
           swfu = new SWFUpload({
               // Backend Settings
               upload_url: "/CutPhoto.ashx?action=up",//交给一般处理程序来处理
               post_params: {
                   "ASPSESSID": "<%=Session.SessionID %>"
               },

               // File Upload Settings
               file_size_limit: "2 MB",
               file_types: "*.jpg;*.gif",
               file_types_description: "JPG Images",
               file_upload_limit: 0,    // Zero means unlimited

               // Event Handler Settings - these functions as defined in Handlers.js
               //  The handlers are not part of SWFUpload but are part of my website and control how
               //  my website reacts to the SWFUpload events.
               swfupload_preload_handler: preLoad,
               swfupload_load_failed_handler: loadFailed,
               file_queue_error_handler: fileQueueError,
               file_dialog_complete_handler: fileDialogComplete,
               upload_progress_handler: uploadProgress,
               upload_error_handler: uploadError,
               upload_success_handler: Show,//这里修改了方法的定义。
               upload_complete_handler: uploadComplete,

               // Button settings
               button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png",
               button_placeholder_id: "spanButtonPlaceholder",
               button_width: 160,
               button_height: 22,
               button_text: '<span class="button">选择上传图片 <span class="buttonSmall">(2 MB Max)</span></span>',
               button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
               button_text_top_padding: 1,
               button_text_left_padding: 5,

               // Flash Settings
               flash_url: "/SWFUpload/swfupload.swf", // Relative to this file
               flash9_url: "/SWFUpload/swfupload_FP9.swf", // Relative to this file

               custom_settings: {
                   upload_target: "divFileProgressContainer"
               },

               // Debug Settings
               debug: false
           });
       }
       var s;
       //上传成功以后执行该方法
       function Show(file, serverData) {
           s = serverData.split(':');//接收从服务端返回的数据，按照分号分隔

           if (s[0] == "ok") {
               //将服务端返回的图片路径作为外层DIV的背景。
               //注意：backgroundImage:I要大写,url:
               $("#divContent").css("backgroundImage", "url(" + s[1] + ")").css("width", s[2] + "px").css("height", s[3] + "px");//注意单位一定要加上
           }
       }
       //截图
       $(function () {
           $("#divCut").resizable({
               containment: '#divContent'
           }).draggable({ containment: 'parent' });
           $("#btnCut").click(function () {
               //开始获取divCut的范围
               //offset():表示元素相对浏览器的相对坐标.
               var y = $("#divCut").offset().top - $("#divContent").offset().top; //得到纵坐标.
               var x = $("#divCut").offset().left - $("#divContent").offset().left;
               var width = $("#divCut").width(); //宽度
               var height = $("#divCut").height(); //高度.
               $.post("/CutPhoto.ashx", { "action": "cut", "x": parseInt(x), "y": parseInt(y), "width": parseInt(width), "height": parseInt(height), "imgSrc": s[1] }, function (data) {
                   $("#cutPhotoSrc").attr("src", data);
               });
           });
           //打水印并预览
           $("#waterPhoto").click(function () {
               $.post("/CutPhoto.ashx", {"action":"water","imgSrc":s[1]},function(data){
                   $("#waterPhoto").attr("src", data);
               });
           });
       });
   </script>
</head>
<body>
   <form id="form1" runat="server">

       <div id="content">

           <div id="swfu_container" style="margin: 0px 10px;">
               <div>
                   <span id="spanButtonPlaceholder"></span>
               </div>

               <div id="divFileProgressContainer" style="height: 75px;"></div>

           </div>
       </div>
       <div id="divContent" style="width: 300px; height: 300px">
           <div id="divCut" style="height: 100px; width: 100px; border: 1px solid red"></div>
       </div>
       <input type="button" id="btnCut" value="裁剪" />
       <input type="button" id="btnWater" value="水印" />
       <img id="cutPhotoSrc" />
       <img id="waterPhoto" />

   </form>
</body>
</html>
    
   

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

namespace Wolfy.ImageWeb
{
   /// <summary>
   /// CutPhoto 的摘要说明
   /// </summary>
   public class CutPhoto : IHttpHandler
   {

       public void ProcessRequest(HttpContext context)
       {
           context.Response.ContentType = "text/plain";
           string action = context.Request["action"];
           if (action == "up")
           {
               HttpPostedFile file = context.Request.Files["Filedata"];//获取上传的文件数据.
               string fileName = Path.GetFileName(file.FileName);//获取上传文件的名称.
               string fileExt = Path.GetExtension(fileName);//得到文件的扩展名.

               if (fileExt == ".jpg")
               {
                   using (Image img = Image.FromStream(file.InputStream))//根据上传的图片创建一个Image,获取图片的高度与宽度.
                   {

                       file.SaveAs(context.Server.MapPath("/UploadImage/" + fileName));//把图片保存起来。
                       context.Response.Write("ok:/UploadImage/" + fileName + ":" + img.Width + ":" + img.Height);//将图片路径与图片的高度与宽度返回浏览器
                   }
               }
           }
           else if (action == "cut")//图片截取.
           {

               //1接收参数.
               int x = Convert.ToInt32(context.Request.Form["x"]);
               int y = Convert.ToInt32(context.Request.Form["y"]);
               int width = Convert.ToInt32(context.Request.Form["width"]);
               int height = Convert.ToInt32(context.Request.Form["height"]);
               string imgSrc = context.Request.Form["imgSrc"];
               //2:创建画布
               using (Bitmap map = new Bitmap(width, height))//将红色DIV确定范围画到画布上
               {
                   //3;画笔
                   using (Graphics g = Graphics.FromImage(map))
                   {
                       //4:用画笔将图片画到画布上
                       using (Image img = Image.FromFile(context.Server.MapPath(imgSrc)))
                       {
                           //1:指定的是对哪张图片进行操作.
                           //2:指定画多么大。
                           //3:画img的哪一部分.
                           g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
                           string newfileName = Guid.NewGuid().ToString().Substring(0, 8);
                           map.Save(context.Server.MapPath("/UploadImage/" + newfileName + ".jpg"));//保存截取后的图片.
                           context.Response.Write("/UploadImage/" + newfileName + ".jpg");
                       }

                   }

               }
           }
           else if (action == "water")
           {
               string imgSrc = context.Request.Form["imgSrc"];
               //将照片作为画板
               using (Image img = Image.FromFile(context.Server.MapPath(imgSrc)))
               {
                   //3;画笔
                   using (Graphics g = Graphics.FromImage(img))
                   {
                       //4:用画笔将字符串画到画布上
                       //1:指定的是对哪张图片进行操作.
                       //2:指定画多么大。
                       //3:画img的哪一部分.
                       g.DrawString("http://www.wolfy.com",new Font("华文行楷",30),new SolidBrush(Color.Red), new Rectangle(0, 0, img.Width, img.Height));
                       string newfileName = Guid.NewGuid().ToString().Substring(0, 8);
                       img.Save(context.Server.MapPath("/UploadImage/" + newfileName + ".jpg"));//保存水印后的图片.
                       context.Response.Write("/UploadImage/" + newfileName + ".jpg");
                   }
               }
               //
               //
               //{
               //    //4:用画笔将图片画到画布上

               //    {
               //        //1:指定的是对哪张图片进行操作.
               //        //2:指定画多么大。
               //        //3:画img的哪一部分.
               //        g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
               //        string newfileName = Guid.NewGuid().ToString().Substring(0, 8);
               //        map.Save(context.Server.MapPath("/UploadImage/" + newfileName + ".jpg"));//保存截取后的图片.
               //        context.Response.Write("/UploadImage/" + newfileName + ".jpg");



           }
       }

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

其实对照片的操作还有生成缩略图，我想着图片上传后，就是对照片按比例缩放，这里就不再赘述了。其实在总结的时候，遇到最让人DT的就是uploadify这个上传插件，也不知道什么地方设置错了，能上传成功，但就是不能触发事件，这里也将代码贴出来，有知道的大神，一定告诉我，这代码很折腾人啊。

这可能也是我选择swfupload放弃uploadify的原因，不能触发上传成功的事件，获取不到上传成功的图片的路径。

解决方案：

代码：

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml">
 3 <head>
 4     <title></title>
 5     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 6     <script src="/uploadify/jquery-1.7.2.min.js" type="text/javascript"></script>
 7     <!--<script src="/uploadify/jquery.uploadify-3.1.min.js" type="text/javascript"></script>-->
 8     <script src="uploadify/jquery.uploadify.min.js"></script>
 9     <link href="/uploadify/uploadify.css" rel="stylesheet" type="text/css" />
10     <script type="text/javascript">
11         $(document).ready(function () {
12             //.uploadify()方法创建Uploadify上传组件的一个实例。
13             $('#file_upload').uploadify({
14                 'auto': false, //关闭自动上传
15                 'removeTimeout': 1, //文件队列上传完成1秒后删除
16                 'swf': '/uploadify/uploadify.swf',
17                 'uploader': '/uploadify/Uploadify.ashx',
18                 'method': 'post', //方法，post还是get提交
19                 'buttonText': '浏 览', //设置按钮文本
20                 'multi': false, //允许同时上传多张图片
21                 'uploadLimit': 10, //一次最多只允许上传10张图片
22                 'fileTypeDesc': 'Image Files', //只允许上传图像
23                 'fileTypeExts': '*.gif; *.jpg; *.png;*.dwg', //限制允许上传的图片后缀
24                 'fileSizeLimit': 2048000, //限制上传的图片不得超过2M
25                 'onComplete': complete,
26                 'onUploadSuccess': function (file, data, response) {//每次成功上传后执行的回调函数，从服务端返回数据到前端
27                     $('#' + file.id).find('.data').html('      上传完毕');
28                 },
29                 
30                 'onError': error
31 
32 
33             });
34 
35         });
36         function complete(event, queueID, fileObj, response, data) {
37             alert(123);
38         };
39         function error(event, queueID, fileObj) {
40             alert("文件:" + fileObj.name + " 上传失败");
41         }
42     </script>
43 </head>
44 <body>
45     <div id="fileQueue">
46     </div>
47     <input id="file_upload" name="file_upload" type="file" />
48     <p>
49         <span style="color: Red; font-size: small;">最多一次上传<b id="aLimit">10</b>张图片</span><br />
50         <a href="javascript:$('#file_upload').uploadify('settings', 'formData', {'typeCode':document.getElementById('id_file').value});$('#file_upload').uploadify('upload','*')">上传</a> <a href="javascript:$('#file_upload').uploadify('cancel','*')">重置上传队列</a>
51     </p>
52     <input type="hidden" value="1215154" name="tmpdir" id="id_file" />
53     <div id="showImg">
54         <img src="#" alt="" id="image" />
55     </div>
56 </body>
57 </html>

一般处理程序代码：

 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Web;
 6 
 7 
 8 namespace UploadifyAndWatermark.uploadify
 9 {
10     /// <summary>
11     /// Uploadify 的摘要说明
12     /// </summary>
13     public class Uploadify : IHttpHandler
14     {
15 
16         public void ProcessRequest(HttpContext context)
17         {
18             context.Response.ContentType = "text/plain";
19             context.Response.Charset = "utf-8";
20             //接收上传的文件
21             HttpPostedFile file = context.Request.Files["Filedata"];
22 
23             if (file != null)
24             {
25                 string fileName = Path.GetFileName(file.FileName);//获取上传文件的名称.
26                 string fileExt = Path.GetExtension(fileName);//得到文件的扩展名.
27 
28                 //将上传的图片放到不同的文件夹下.(根据日期)
29                 string dir = "/UploadImage/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/";
30                 Directory.CreateDirectory(Path.GetDirectoryName(context.Server.MapPath(dir)));//创建文件夹.
31                 //文件重命名名字 用当前时间作为新名字 保存在相应的日期文件夹下
32                 string fullDir = dir + DateTime.Now.ToString("yyyyMMddhhmmss") + fileExt;//构建完整的文件路径.
33                 //保存图片
34                 file.SaveAs(context.Server.MapPath(fullDir));
35                 //将图片的路径返回context.Resopnse.Write(fullDir);
36                 context.Response.Write("1");
37                
38             }
39             else
40             {
41                 context.Response.Write("0");
42             }
43 
44         }
45 
46 
47         public bool IsReusable
48         {
49             get
50             {
51                 return false;
52             }
53         }
54     }
55 }

这里将代码展开，方便看到的大神，知道什么原因的，不要吝啬你的一点点点点时间，拯救一下我这个为代码疯狂的小白，不胜感激！

问题：在uploadify上传成功后，为什么不触发oncompelete事件？

是否上传成功后的路径可以 context.Response.Write(路径);在oncompelete事件参数中response能获取到该路径？

Demo下载：

Wolfy.UploadifyAndWatermark.rar uploadify照片上传

Wolfy.ImageOperation.rar swfuploadify照片上传，预览，截图，水印

博客地址：

http://www.cnblogs.com/wolf-sun/

博客版权：

本文以学习、研究和分享为主，欢迎转载，但必须在文章页面明显位置给出原文连接。
如果文中有不妥或者错误的地方还望高手的你指出，以免误人子弟。如果觉得本文对你有所帮助不如【推荐】一下！如果你有更好的建议，不如留言一起讨论，共同进步！
再次感谢您耐心的读完本篇文章。http://www.cnblogs.com/wolf-sun/p/3266151.html

周末大放送网站图片上传，水印，预览，截图

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