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。
1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SWFUploadImage.aspx.cs" Inherits="Wolfy.ImageWeb.SWFUploadImage" %>
2
3 <!DOCTYPE html>
4
5 <html xmlns="http://www.w3.org/1999/xhtml">
6 <head id="Head1" runat="server">
7 <title></title>
8 <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
9 <script src="../SWFUpload/swfupload.js" type="text/javascript"></script>
10 <script src="../SWFUpload/handlers.js" type="text/javascript"></script>
11 <script src="../Script/jquery-1.7.1.js"></script>
12 <script type="text/javascript">
13 var swfu;
14 window.onload = function () {
15 swfu = new SWFUpload({
16 // Backend Settings
17 upload_url: "/SWFUploadHandler.ashx",//交给一般处理程序来处理
18 post_params: {
19 "ASPSESSID": "<%=Session.SessionID %>"
20 },
21
22 // File Upload Settings
23 file_size_limit: "2 MB",
24 file_types: "*.jpg;*.gif",
25 file_types_description: "JPG Images",
26 file_upload_limit: 0, // Zero means unlimited
27
28 // Event Handler Settings - these functions as defined in Handlers.js
29 // The handlers are not part of SWFUpload but are part of my website and control how
30 // my website reacts to the SWFUpload events.
31 swfupload_preload_handler: preLoad,
32 swfupload_load_failed_handler: loadFailed,
33 file_queue_error_handler: fileQueueError,
34 file_dialog_complete_handler: fileDialogComplete,
35 upload_progress_handler: uploadProgress,
36 upload_error_handler: uploadError,
37 upload_success_handler: Show,//这里修改了方法的定义。
38 upload_complete_handler: uploadComplete,
39
40 // Button settings
41 button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png",
42 button_placeholder_id: "spanButtonPlaceholder",
43 button_width: 160,
44 button_height: 22,
45 button_text: '<span class="button">选择上传图片 <span class="buttonSmall">(2 MB Max)</span></span>',
46 button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
47 button_text_top_padding: 1,
48 button_text_left_padding: 5,
49
50 // Flash Settings
51 flash_url: "/SWFUpload/swfupload.swf", // Relative to this file
52 flash9_url: "/SWFUpload/swfupload_FP9.swf", // Relative to this file
53
54 custom_settings: {
55 upload_target: "divFileProgressContainer"
56 },
57
58 // Debug Settings
59 debug: false
60 });
61 }
62 //上传成功以后执行该方法
63 function Show(file, serverData) {
64 var s = serverData.split(':');//接收从服务端返回的数据，按照分号分隔
65
66 if (s[0] == "ok") {
67 $("#imgSrc").attr("src", s[1]);
68 }
69 }
70 </script>
71 </head>
72 <body>
73 <form id="form1" runat="server">
74
75 <div id="content">
76
77 <div id="swfu_container" style="margin: 0px 10px;">
78 <div>
79
80 <span id="spanButtonPlaceholder"></span>
81
82 </div>
83
84 <div id="divFileProgressContainer" style="height: 75px;"></div>
85
86 <img id="imgSrc" />
87 </div>
88 </div>
89 </form>
90 </body>
91 </html>
1 using System;
2 using System.Collections.Generic;
3 using System.Drawing;
4 using System.IO;
5 using System.Linq;
6 using System.Web;
7
8 namespace Wolfy.ImageWeb
9 {
10 /// <summary>
11 /// SWFUploadHandler 的摘要说明
12 /// </summary>
13 public class SWFUploadHandler : IHttpHandler
14 {
15
16 public void ProcessRequest(HttpContext context)
17 {
18 context.Response.ContentType = "text/plain";
19 HttpPostedFile file = context.Request.Files["Filedata"];//获取上传的文件数据.
20 string fileName = Path.GetFileName(file.FileName);//获取上传文件的名称.
21 string fileExt = Path.GetExtension(fileName);//得到文件的扩展名.
22
23 if (fileExt == ".jpg")
24 {
25 //将上传的图片放到不同的文件夹下.(根据日期)
26 string dir = "/UploadImage/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/";
27 Directory.CreateDirectory(Path.GetDirectoryName(context.Server.MapPath(dir)));//创建文件夹.
28 //文件重命名名字
29 string fullDir = dir + DateTime.Now.ToString("yyyyMMddhhmmss") + fileExt;//构建完整的文件路径.
30 file.SaveAs(context.Server.MapPath(fullDir));
31 context.Response.Write("ok:" + fullDir);
32
33
34 }
35 }
36
37 public bool IsReusable
38 {
39 get
40 {
41 return false;
42 }
43 }
44 }
45 }
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）
1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CutPhoto.aspx.cs" Inherits="Wolfy.ImageWeb.CutPhoto1" %>
2
3 <html xmlns="http://www.w3.org/1999/xhtml">
4 <head id="Head1" runat="server">
5 <title></title>
6 <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
7 <script src="../SWFUpload/swfupload.js" type="text/javascript"></script>
8 <script src="../SWFUpload/handlers.js" type="text/javascript"></script>
9 <script src="../Script/jquery-1.7.1.js"></script>
10 <script src="Script/jquery-ui-1.8.2.custom.min.js"></script>
11 <script type="text/javascript">
12 var swfu;
13 window.onload = function () {
14 swfu = new SWFUpload({
15 // Backend Settings
16 upload_url: "/CutPhoto.ashx?action=up",//交给一般处理程序来处理
17 post_params: {
18 "ASPSESSID": "<%=Session.SessionID %>"
19 },
20
21 // File Upload Settings
22 file_size_limit: "2 MB",
23 file_types: "*.jpg;*.gif",
24 file_types_description: "JPG Images",
25 file_upload_limit: 0, // Zero means unlimited
26
27 // Event Handler Settings - these functions as defined in Handlers.js
28 // The handlers are not part of SWFUpload but are part of my website and control how
29 // my website reacts to the SWFUpload events.
30 swfupload_preload_handler: preLoad,
31 swfupload_load_failed_handler: loadFailed,
32 file_queue_error_handler: fileQueueError,
33 file_dialog_complete_handler: fileDialogComplete,
34 upload_progress_handler: uploadProgress,
35 upload_error_handler: uploadError,
36 upload_success_handler: Show,//这里修改了方法的定义。
37 upload_complete_handler: uploadComplete,
38
39 // Button settings
40 button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png",
41 button_placeholder_id: "spanButtonPlaceholder",
42 button_width: 160,
43 button_height: 22,
44 button_text: '<span class="button">选择上传图片 <span class="buttonSmall">(2 MB Max)</span></span>',
45 button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
46 button_text_top_padding: 1,
47 button_text_left_padding: 5,
48
49 // Flash Settings
50 flash_url: "/SWFUpload/swfupload.swf", // Relative to this file
51 flash9_url: "/SWFUpload/swfupload_FP9.swf", // Relative to this file
52
53 custom_settings: {
54 upload_target: "divFileProgressContainer"
55 },
56
57 // Debug Settings
58 debug: false
59 });
60 }
61 var s;
62 //上传成功以后执行该方法
63 function Show(file, serverData) {
64 s = serverData.split(':');//接收从服务端返回的数据，按照分号分隔
65
66 if (s[0] == "ok") {
67 //将服务端返回的图片路径作为外层DIV的背景。
68 //注意：backgroundImage:I要大写,url:
69 $("#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
70 }
71 }
72 //截图
73 $(function () {
74 $("#divCut").resizable({
75 containment: '#divContent'
76 }).draggable({ containment: 'parent' });
77 $("#btnCut").click(function () {
78 //开始获取divCut的范围
79 //offset():表示元素相对浏览器的相对坐标.
80 var y = $("#divCut").offset().top - $("#divContent").offset().top; //得到纵坐标.
81 var x = $("#divCut").offset().left - $("#divContent").offset().left;
82 var width = $("#divCut").width(); //宽度
83 var height = $("#divCut").height(); //高度.
84 $.post("/CutPhoto.ashx", { "action": "cut", "x": parseInt(x), "y": parseInt(y), "width": parseInt(width), "height": parseInt(height), "imgSrc": s[1] }, function (data) {
85 $("#cutPhotoSrc").attr("src", data);
86 });
87 });
88 //打水印并预览
89 $("#waterPhoto").click(function () {
90 $.post("/CutPhoto.ashx", {"action":"water","imgSrc":s[1]},function(data){
91 $("#waterPhoto").attr("src", data);
92 });
93 });
94 });
95 </script>
96 </head>
97 <body>
98 <form id="form1" runat="server">
99
100 <div id="content">
101
102 <div id="swfu_container" style="margin: 0px 10px;">
103 <div>
104 <span id="spanButtonPlaceholder"></span>
105 </div>
106
107 <div id="divFileProgressContainer" style="height: 75px;"></div>
108
109 </div>
110 </div>
111 <div id="divContent" style="width: 300px; height: 300px">
112 <div id="divCut" style="height: 100px; width: 100px; border: 1px solid red"></div>
113 </div>
114 <input type="button" id="btnCut" value="裁剪" />
115 <input type="button" id="btnWater" value="水印" />
116 <img id="cutPhotoSrc" />
117 <img id="waterPhoto" />
118
119 </form>
120 </body>
121 </html>
1 using System;
2 using System.Collections.Generic;
3 using System.Drawing;
4 using System.IO;
5 using System.Linq;
6 using System.Web;
7
8 namespace Wolfy.ImageWeb
9 {
10 /// <summary>
11 /// CutPhoto 的摘要说明
12 /// </summary>
13 public class CutPhoto : IHttpHandler
14 {
15
16 public void ProcessRequest(HttpContext context)
17 {
18 context.Response.ContentType = "text/plain";
19 string action = context.Request["action"];
20 if (action == "up")
21 {
22 HttpPostedFile file = context.Request.Files["Filedata"];//获取上传的文件数据.
23 string fileName = Path.GetFileName(file.FileName);//获取上传文件的名称.
24 string fileExt = Path.GetExtension(fileName);//得到文件的扩展名.
25
26 if (fileExt == ".jpg")
27 {
28 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.
29 {
30
31 file.SaveAs(context.Server.MapPath("/UploadImage/" + fileName));//把图片保存起来。
32 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
33 }
34 }
35 }
36 else if (action == "cut")//图片截取.
37 {
38
39 //1接收参数.
40 int x = Convert.ToInt32(context.Request.Form["x"]);
41 int y = Convert.ToInt32(context.Request.Form["y"]);
42 int width = Convert.ToInt32(context.Request.Form["width"]);
43 int height = Convert.ToInt32(context.Request.Form["height"]);
44 string imgSrc = context.Request.Form["imgSrc"];
45 //2:创建画布
46 using (Bitmap map = new Bitmap(width, height))//将红色DIV确定范围画到画布上
47 {
48 //3;画笔
49 using (Graphics g = Graphics.FromImage(map))
50 {
51 //4:用画笔将图片画到画布上
52 using (Image img = Image.FromFile(context.Server.MapPath(imgSrc)))
53 {
54 //1:指定的是对哪张图片进行操作.
55 //2:指定画多么大。
56 //3:画img的哪一部分.
57 g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
58 string newfileName = Guid.NewGuid().ToString().Substring(0, 8);
59 map.Save(context.Server.MapPath("/UploadImage/" + newfileName + ".jpg"));//保存截取后的图片.
60 context.Response.Write("/UploadImage/" + newfileName + ".jpg");
61 }
62
63 }
64
65 }
66 }
67 else if (action == "water")
68 {
69 string imgSrc = context.Request.Form["imgSrc"];
70 //将照片作为画板
71 using (Image img = Image.FromFile(context.Server.MapPath(imgSrc)))
72 {
73 //3;画笔
74 using (Graphics g = Graphics.FromImage(img))
75 {
76 //4:用画笔将字符串画到画布上
77 //1:指定的是对哪张图片进行操作.
78 //2:指定画多么大。
79 //3:画img的哪一部分.
80 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));
81 string newfileName = Guid.NewGuid().ToString().Substring(0, 8);
82 img.Save(context.Server.MapPath("/UploadImage/" + newfileName + ".jpg"));//保存水印后的图片.
83 context.Response.Write("/UploadImage/" + newfileName + ".jpg");
84 }
85 }
86 //
87 //
88 //{
89 // //4:用画笔将图片画到画布上
90
91 // {
92 // //1:指定的是对哪张图片进行操作.
93 // //2:指定画多么大。
94 // //3:画img的哪一部分.
95 // g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
96 // string newfileName = Guid.NewGuid().ToString().Substring(0, 8);
97 // map.Save(context.Server.MapPath("/UploadImage/" + newfileName + ".jpg"));//保存截取后的图片.
98 // context.Response.Write("/UploadImage/" + newfileName + ".jpg");
99
100
101
102 }
103 }
104
105 public bool IsReusable
106 {
107 get
108 {
109 return false;
110 }
111 }
112 }
113 }
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