一、SWFUpload介绍
1. 首先为什么要使用该组建进行上传文件？而不使用以往的上传文件的方式。
答：因为以往的上传文件会造成表单页面的刷新。这样上传文件会很不方便。但是SWFUpload能够很好的解决该困惑。
二、 SWFUpload的使用，建议去看看别人写的demo，然后再去使用该插件。
1. 首先需要引入相关的js文件
<script src="../js/jquery-1.7.1.js"></script> //jquery组件
<script src="../SWFUpload/swfupload.js"></script> <script src="../SWFUpload/handlers.js"></script>
2. 其核心代码和配置是如下代码。复制到自己的编辑器中研究一下。其中修改了配置项对应的upload_success_handler返回成功的事件
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CutPhoto.aspx.cs" Inherits="BookShop.Web.Member.CutPhoto" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <link href="../Css/themes/ui-lightness/jquery-ui-1.8.2.custom.css" rel="stylesheet" /> <script src="../js/jquery-1.7.1.js"></script> <script src="../js/jquery-ui-1.8.2.custom.min.js"></script> <script src="../SWFUpload/swfupload.js"></script> <script src="../SWFUpload/handlers.js"></script> <script type="text/javascript"> var swfu; window.onload = function () { swfu = new SWFUpload({ // Backend Settings upload_url: "/ashx/upload.ashx?action=upload", 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: showImage, upload_complete_handler: uploadComplete, // Button settings button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png", button_placeholder_id: "spanButtonPlaceholder", button_ 160, button_height: 22, button_text: '<span class="button">请选择上传图片<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 }); } //上传成功以后调用该方法 function showImage(file, serverData) { // $("#showPhoto").attr("src", serverData); var data = serverData.split(':'); //先将字符串分割，分割出图片的高度和宽度 //将上传成功的图片作为DIV的背景 $("#hiddenImageUrl").val(data[0]);//将上传成功的图片路径存储到隐藏域中。 //设置图片路径和设置其宽度和高度 $("#divContent").css("backgroundImage", "url('" + data[0] + "')").css("width",data[1]+"px").css("height",data[2]+"px"); } $(function () { //让DIV可以(draggable)移动与(resizable)拖动大小 $("#divCut").draggable({ containment: "#divContent", scroll: false }).resizable({ containment: "#divContent" }); //添加单击事件，截图头像 $("#btnCut").click(function () { cutPhoto(); }); }) //截取头像 function cutPhoto() { //计算要截取的头像的范围。 offset（计算出该div距离浏览器顶部的距离） var y = $("#divCut").offset().top - $("#divContent").offset().top;//纵坐标 var x = $("#divCut").offset().left - $("#divContent").offset().left; //获取宽度和高度，都是由jQuery封装好的方法 var width = $("#divCut").width(); var heigth = $("#divCut").height(); var pars = { "x": x, "y": y, "width": width, "height": heigth, "action": "cut", "imgSrc": $("#hiddenImageUrl").val() }; $.post("/ashx/upload.ashx", pars, function (data) { $("#showPhoto").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 id="thumbnails"></div> <div id="divContent" style="300px; height:300px;"> <div id="divCut" style="100px;height:100px; border:solid red 1px"> </div> </div> <input type="button" value="截取图片" id="btnCut" /> <input type="hidden" id="hiddenImageUrl" /> <img id="showPhoto"></img> </div> </div> </form> </body> </html>
对应的请求。
using System; using System.Collections.Generic; using System.Drawing; using System.IO; using System.Linq; using System.Web; namespace BookShop.Web.ashx { /// <summary> /// upload 的摘要说明 /// </summary> public class upload : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string action = context.Request["action"]; if (action == "upload")//上传图片 { ProcessFileUpload(context); } else if (action =="cut")//截取图片 { ProcessCutPhoto(context); } else { context.Response.Write("参数错误!!"); } } /// <summary> /// 文件上传 /// </summary> /// <param name="context"></param> private void ProcessFileUpload(HttpContext context) { HttpPostedFile file = context.Request.Files["Filedata"]; if (file != null) { //获取文件名和扩展名 string fileName = Path.GetFileName(file.FileName); string fileExt = Path.GetExtension(fileName); //如果扩展名等于。jpg if (fileExt == ".jpg") { string dir = "/ImageUpload/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/"; if (!Directory.Exists(context.Request.MapPath(dir))) { Directory.CreateDirectory(context.Request.MapPath(dir)); } string newfileName = Guid.NewGuid().ToString(); string fullDir = dir + newfileName + fileExt; file.SaveAs(context.Request.MapPath(fullDir)); //生成一个image的实例，取出上传图片的高度和宽度 using (Image img = Image.FromFile(context.Request.MapPath(fullDir))) { context.Response.Write(fullDir + ":" + img.Width + ":" + img.Height); } //file.SaveAs(context.Request.MapPath("/ImageUpload/"+fileName)); //context.Response.Write("/ImageUpload/" + fileName); } } } /// <summary> /// 图片的截取 /// </summary> /// <param name="context"></param> private void ProcessCutPhoto(HttpContext context) { int x = Convert.ToInt32(context.Request["x"]); int y = Convert.ToInt32(context.Request["y"]); int width = Convert.ToInt32(context.Request["width"]); int height = Convert.ToInt32(context.Request["height"]); string imgSrc = context.Request["imgSrc"];//获取上传成功的图片的路径 //创建一个画布 using (Bitmap map = new Bitmap(width, height)) { //创建一个画笔 using (Graphics g = Graphics.FromImage(map)) { //new一个image对象， using (Image img = Image.FromFile(context.Request.MapPath(imgSrc))) { //第一个参数：表示画哪张图片. //二：画多么大。 //三：画原图的哪块区域 g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel); string newfileName = Guid.NewGuid().ToString(); string fullDir = "/ImageUpload/" + newfileName + ".jpg"; map.Save(context.Request.MapPath(fullDir),System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.Write(fullDir); } } } } public bool IsReusable { get { return false; } } } }
3. imageAreaSelect插件使用：利用该插件截取图片，其中后端代码不变，还是和上方一样。但是此处需要引入相关的文件。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CutPhoto.aspx.cs" Inherits="BookShop.Web.Member.CutPhoto" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <%-- <link href="../Css/themes/ui-lightness/jquery-ui-1.8.2.custom.css" rel="stylesheet" />--%> <link href="../Css/imgareaselect-default.css" rel="stylesheet" /> <script src="../js/jquery-1.7.1.js"></script> <%-- <script src="../js/jquery-ui-1.8.2.custom.min.js"></script>--%> <script src="../js/jquery.imgareaselect.min.js"></script> <script src="../SWFUpload/swfupload.js"></script> <script src="../SWFUpload/handlers.js"></script> <script type="text/javascript"> var swfu; window.onload = function () { swfu = new SWFUpload({ // Backend Settings upload_url: "/ashx/upload.ashx?action=upload", 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, 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: showImage, upload_complete_handler: uploadComplete, // Button settings button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png", button_placeholder_id: "spanButtonPlaceholder", button_ 160, button_height: 22, button_text: '<span class="button">请选择上传图片<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 }); } //上传成功以后调用该方法 function showImage(file, serverData) { var data = serverData.split(':'); $("#selectbanner").attr("src", data[0]); $('#selectbanner').imgAreaSelect({ selectionColor: 'blue', x1: 0, y1: 0, x2: 100, y2: 100,selectionOpacity: 0.2, onSelectEnd: preview }); } //选择结束以后调用该方法 function preview(img, selection) { $('#selectbanner').data('x', selection.x1); $('#selectbanner').data('y', selection.y1); $('#selectbanner').data('w', selection.width); $('#selectbanner').data('h', selection.height); } $(function () { $("#btnCut").click(function () { cutPhoto(); }); }) //截取头像 function cutPhoto() { var pars = { "x": $('#selectbanner').data('x'), "y": $('#selectbanner').data('y'), "width": $('#selectbanner').data('w'), "height": $('#selectbanner').data('h'), "action": "cut", "imgSrc": $("#selectbanner").attr("src") }; $.post("/ashx/upload.ashx", pars, function (data) { $("#showPhoto").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 id="thumbnails"></div> <input type="button" value="截取图片" id="btnCut" /> <input type="hidden" id="hiddenImageUrl" /> <img id="selectbanner" /> <img id="showPhoto"/> </div> </div> </form> </body> </html>