最终修改版汇总
1 /// <summary> 2 /// 缩略图 3 /// </summary> 4 public class Thumbnail 5 { 6 public Thumbnail(string id, byte[] data) 7 { 8 this.ID = id; 9 this.Data = data;10 }11 12 private string id;13 14 /// <summary>15 /// 图片id16 /// </summary>17 public string ID18 {19 get20 {21 return this.id;22 }23 set24 {25 this.id = value;26 }27 }28 29 private byte[] thumbnail_data;30 31 /// <summary>32 /// 图片的二进制数据33 /// </summary>34 public byte[] Data35 {36 get37 {38 return this.thumbnail_data;39 }40 set41 {42 this.thumbnail_data = value;43 }44 }45 46 private string contentType;47 48 /// <summary>49 /// 图片对应的MIME类型50 /// </summary>51 public string ContentType52 {53 get54 {55 return contentType;56 }57 58 set59 {60 contentType = value;61 }62 }63 }
Thumbnail
<!DOCTYPE html><html ="http://www.w3.org/1999/xhtml"><head> <title>Upload Images</title> <script src='/images/loading.gif' data-original="swfupload/swfupload.js"></script> <script src='/images/loading.gif' data-original="swfupload/handlers.js"></script> <script> //注:div的id名称最好不要改,要改的话在handlers.js文件中也要进行修改,div的名称已经在handlers.js文件中写死 var swfu; window.onload = function () { swfu = new SWFUpload({ // 后台设置,设置处理上传的页面 upload_url: "/Handlers/ImageUploadHandler.ashx", // 文件上传大小限制设置 file_size_limit: "3 MB", //文件类型设置,多种格式以英文中的分号分开 file_types: "*.jpg;*.png", //文件描述,与弹出的选择文件对话框相关 file_types_description : "Images file", //设置上传文件数量限制 file_upload_limit: "1", //事件处理程序,最好不要改,事件处理程序已在handlers.js文件中定义 // 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. file_queue_error_handler : fileQueueError, file_dialog_complete_handler : fileDialogComplete, upload_progress_handler : uploadProgress, upload_error_handler : uploadError, upload_success_handler : uploadSuccess, upload_complete_handler : uploadComplete, // 上传按钮设置 button_image_url : "/swfupload/images/XPButtonNoText_160x22.png", button_placeholder_id: "spanButtonPlaceholder", button_width: 160, button_height: 22, button_text : '请选择图片 (最大3M)', 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, // swfupload.swf flash设置 flash_url : "/swfupload/swfupload.swf", //自定义的其他设置 custom_settings : { upload_target: "divFileProgressContainer" }, // 是否开启调试模式,调试时可以设置为true,发布时设置为false debug: false }); } </script></head><body> <form id="form1"> <div id="content"> <h2>Upload Images Demo</h2> <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> </div> </form></body></html>
Html Demo
1 /// <summary> 2 /// 图片上传处理 3 /// </summary> 4 public class ImageUploadHandler : IHttpHandler, IRequiresSessionState 5 { 6 /// <summary> 7 /// 记录日志 logger 8 /// </summary> 9 private static Common.LogHelper logger = new Common.LogHelper(typeof(ImageUploadHandler)); 10 public void ProcessRequest(HttpContext context) 11 { 12 context.Response.ContentType = "text/plain"; 13 System.Drawing.Image thumbnail_image = null; 14 System.Drawing.Image original_image = null; 15 System.Drawing.Bitmap final_image = null; 16 System.Drawing.Graphics graphic = null; 17 MemoryStream ms = null; 18 try 19 { 20 //验证用户是否登录,是否有权限上传 21 if (context.Session["User"]==null) 22 { 23 context.Response.Write("没有上传图片的权限!"); 24 context.Response.End(); 25 return; 26 } 27 //获取上传文件 28 HttpPostedFile image_upload = context.Request.Files["Filedata"]; 29 //获取文件扩展名 30 string fileExt = System.IO.Path.GetExtension(image_upload.FileName).ToLower(); 31 //验证文件扩展名是否符合要求,是否是允许的图片格式 32 if (fileExt!=".jpg"&&fileExt!=".png") 33 { 34 return; 35 } 36 //当前时间字符串 37 string timeString = DateTime.Now.ToString("yyyyMMddHHmmssfff"); 38 //图片保存虚拟路径构建 39 string path = "/Upload/"+timeString + fileExt; 40 //保存到Session 变量中 41 context.Session["imgPath"] = path; 42 //获取、构建要上传文件的物理路径 43 string serverPath = context.Server.MapPath("~/"+path); 44 //保存图片到服务器 45 image_upload.SaveAs(serverPath); 46 //记录日志 47 logger.Debug("图片上传成功!"); 48 #region 生成缩略图 49 50 // 获取上传图片的文件流 51 original_image = System.Drawing.Image.FromStream(image_upload.InputStream); 52 53 // 根据原图计算缩略图的宽度和高度,及缩放比例等~~ 54 int width = original_image.Width; 55 int height = original_image.Height; 56 int target_width = 100; 57 int target_height = 100; 58 int new_width, new_height; 59 60 float target_ratio = (float)target_width / (float)target_height; 61 float image_ratio = (float)width / (float)height; 62 63 if (target_ratio > image_ratio) 64 { 65 new_height = target_height; 66 new_width = (int)Math.Floor(image_ratio * (float)target_height); 67 } 68 else 69 { 70 new_height = (int)Math.Floor((float)target_width / image_ratio); 71 new_width = target_width; 72 } 73 74 new_width = new_width > target_width ? target_width : new_width; 75 new_height = new_height > target_height ? target_height : new_height; 76 77 //创建缩略图 78 final_image = new System.Drawing.Bitmap(target_width, target_height); 79 graphic = System.Drawing.Graphics.FromImage(final_image); 80 graphic.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.Black), new System.Drawing.Rectangle(0, 0, target_width, target_height)); 81 int paste_x = (target_width - new_width) / 2; 82 int paste_y = (target_height - new_height) / 2; 83 graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; /* new way */ 84 //graphic.DrawImage(thumbnail_image, paste_x, paste_y, new_width, new_height); 85 graphic.DrawImage(original_image, paste_x, paste_y, new_width, new_height); 86 87 // Store the thumbnail in the session (Note: this is bad, it will take a lot of memory, but this is just a demo) 88 ms = new MemoryStream(); 89 //将缩略图保存到内存流中 90 final_image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); 91 92 #endregion 93 94 //建立 Thumbnail对象 95 Thumbnail thumb = new Thumbnail(timeString, ms.GetBuffer()); 96 //保存缩略图到Session 中,也可以保存成文件,保存为图片 97 context.Session["file_info"] = thumb; 98 //操作成功,返回HTTP状态码设置为 200 99 context.Response.StatusCode = 200;100 //输出缩略图的id,在生成缩略图时要用到101 context.Response.Write(thumb.ID);102 }103 catch(Exception ex)104 {105 // 出现异常,返回 500,服务器内部错误106 context.Response.StatusCode = 500;107 //记录错误日志108 logger.Error(ex);109 }110 finally111 {112 // 释放资源113 if (final_image != null) final_image.Dispose();114 if (graphic != null) graphic.Dispose();115 if (original_image != null) original_image.Dispose();116 if (thumbnail_image != null) thumbnail_image.Dispose();117 if (ms != null) ms.Close();118 context.Response.End();119 }120 }121 122 public bool IsReusable123 {124 get125 {126 return false;127 }128 }129 }
ImageUploadHandler
1 /// <summary> 2 /// 获取缩略图 3 /// </summary> 4 public class GetThumbHandler : IHttpHandler, IRequiresSessionState 5 { 6 public void ProcessRequest(HttpContext context) 7 { 8 context.Response.ContentType = "text/plain"; 9 //获取缩略图id10 string id = context.Request.QueryString["id"];11 //id为空则返回错误12 if (String.IsNullOrEmpty(id))13 {14 context.Response.StatusCode = 404;15 context.Response.Write("Not Found");16 context.Response.End();17 return;18 }19 //从Session中获取缩略图文件20 Thumbnail thumb= context.Session["file_info"] as Thumbnail;21 //判断id是否一致22 if (thumb.ID == id)23 {24 //重新设置响应MIME 类型25 context.Response.ContentType = "image/png";26 //输出二进制流信息27 context.Response.BinaryWrite(thumb.Data);28 //截止输出29 context.Response.End();30 return;31 }32 33 //没有找到相应图片,返回40434 context.Response.StatusCode = 404;35 context.Response.Write("Not Found");36 context.Response.End();37 }38 39 public bool IsReusable40 {41 get42 {43 return false;44 }45 }46 }
GetThumbHandler
1 function fileQueueError(file, errorCode, message) { 2 try { 3 var imageName = "error.gif"; 4 var errorName = ""; 5 if (errorCode == SWFUpload.errorCode_QUEUE_LIMIT_EXCEEDED) { 6 errorName = "上传文件过多!"; 7 } 8 9 if (errorName != "") { 10 alert(errorName); 11 return; 12 } 13 14 switch (errorCode) { 15 case SWFUpload.QUEUE_ERROR.ZERO_BYTE_FILE: 16 imageName = "zerobyte.gif"; 17 break; 18 case SWFUpload.QUEUE_ERROR.FILE_EXCEEDS_SIZE_LIMIT: 19 imageName = "toobig.gif"; 20 break; 21 case SWFUpload.QUEUE_ERROR.ZERO_BYTE_FILE: 22 case SWFUpload.QUEUE_ERROR.INVALID_FILETYPE: 23 default: 24 alert(message); 25 break; 26 } 27 //添加图片,注意路径 28 addImage("/swfupload/images/" + imageName); 29 30 } catch (ex) { 31 this.debug(ex); 32 } 33 34 } 35 36 function fileDialogComplete(numFilesSelected, numFilesQueued) { 37 try { 38 if (numFilesQueued > 0) { 39 this.startUpload(); 40 } 41 } catch (ex) { 42 this.debug(ex); 43 } 44 } 45 46 function uploadProgress(file, bytesLoaded) { 47 48 try { 49 var percent = Math.ceil((bytesLoaded / file.size) * 100); 50 51 var progress = new FileProgress(file, this.customSettings.upload_target); 52 progress.setProgress(percent); 53 if (percent === 100) { 54 progress.setStatus("正在创建缩略图..."); 55 progress.toggleCancel(false, this); 56 } else { 57 progress.setStatus("正在上传..."); 58 progress.toggleCancel(true, this); 59 } 60 } catch (ex) { 61 this.debug(ex); 62 } 63 } 64 65 function uploadSuccess(file, serverData) { 66 try { 67 //添加缩略图~~~ 68 //修改这里来设置生成缩略图的页面 69 addImage("/Handlers/GetThumbHandler.ashx?id=" + serverData); 70 var progress = new FileProgress(file, this.customSettings.upload_target); 71 progress.setStatus("缩略图创建成功!"); 72 progress.toggleCancel(false); 73 } catch (ex) { 74 this.debug(ex); 75 } 76 } 77 78 function uploadComplete(file) { 79 try { 80 /* I want the next upload to continue automatically so I'll call startUpload here */ 81 if (this.getStats().files_queued > 0) { 82 this.startUpload(); 83 } else { 84 var progress = new FileProgress(file, this.customSettings.upload_target); 85 progress.setComplete(); 86 progress.setStatus("图片上传成功"); 87 progress.toggleCancel(false); 88 } 89 } catch (ex) { 90 this.debug(ex); 91 } 92 } 93 94 function uploadError(file, errorCode, message) { 95 var imageName = "error.gif"; 96 var progress; 97 try { 98 switch (errorCode) { 99 case SWFUpload.UPLOAD_ERROR.FILE_CANCELLED:100 try {101 progress = new FileProgress(file, this.customSettings.upload_target);102 progress.setCancelled();103 progress.setStatus("上传操作被取消");104 progress.toggleCancel(false);105 }106 catch (ex1) {107 this.debug(ex1);108 }109 break;110 case SWFUpload.UPLOAD_ERROR.UPLOAD_STOPPED:111 try {112 progress = new FileProgress(file, this.customSettings.upload_target);113 progress.setCancelled();114 progress.setStatus("上传停止!");115 progress.toggleCancel(true);116 }117 catch (ex2) {118 this.debug(ex2);119 }120 case SWFUpload.UPLOAD_ERROR.UPLOAD_LIMIT_EXCEEDED:121 imageName = "uploadlimit.gif";122 break;123 default:124 alert(message);125 break;126 }127 128 addImage("/swfupload/images/" + imageName);129 130 } catch (ex3) {131 this.debug(ex3);132 }133 134 }135 136 function addImage(src) {137 var newImg = document.createElement("img");138 newImg.style.margin = "5px";139 document.getElementById("thumbnails").appendChild(newImg);140 if (newImg.filters) {141 try {142 newImg.filters.item("DXImageTransform.Microsoft.Alpha").opacity = 0;143 } catch (e) {144 // If it is not set initially, the browser will throw an error. This will set it if it is not set yet.145 newImg.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + 0 + ')';146 }147 } else {148 newImg.style.opacity = 0;149 }150 151 newImg.onload = function () {152 fadeIn(newImg, 0);153 };154 newImg.src = src;155 }156 157 function fadeIn(element, opacity) {158 var reduceOpacityBy = 5;159 var rate = 30; // 15 fps160 161 162 if (opacity < 100) {163 opacity += reduceOpacityBy;164 if (opacity > 100) {165 opacity = 100;166 }167 168 if (element.filters) {169 try {170 element.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;171 } catch (e) {172 // If it is not set initially, the browser will throw an error. This will set it if it is not set yet.173 element.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + opacity + ')';174 }175 } else {176 element.style.opacity = opacity / 100;177 }178 }179 180 if (opacity < 100) {181 setTimeout(function () {182 fadeIn(element, opacity);183 }, rate);184 }185 }186 187 /* ******************************************188 * FileProgress Object189 * Control object for displaying file info190 * ****************************************** */191 192 function FileProgress(file, targetID) {193 this.fileProgressID = "divFileProgress";194 195 this.fileProgressWrapper = document.getElementById(this.fileProgressID);196 if (!this.fileProgressWrapper) {197 this.fileProgressWrapper = document.createElement("div");198 this.fileProgressWrapper.className = "progressWrapper";199 this.fileProgressWrapper.id = this.fileProgressID;200 201 this.fileProgressElement = document.createElement("div");202 this.fileProgressElement.className = "progressContainer";203 204 var progressCancel = document.createElement("a");205 progressCancel.className = "progressCancel";206 progressCancel.href = "#";207 progressCancel.style.visibility = "hidden";208 progressCancel.appendChild(document.createTextNode(" "));209 210 var progressText = document.createElement("div");211 progressText.className = "progressName";212 progressText.appendChild(document.createTextNode(file.name));213 214 var progressBar = document.createElement("div");215 progressBar.className = "progressBarInProgress";216 217 var progressStatus = document.createElement("div");218 progressStatus.className = "progressBarStatus";219 progressStatus.innerHTML = " ";220 221 this.fileProgressElement.appendChild(progressCancel);222 this.fileProgressElement.appendChild(progressText);223 this.fileProgressElement.appendChild(progressStatus);224 this.fileProgressElement.appendChild(progressBar);225 226 this.fileProgressWrapper.appendChild(this.fileProgressElement);227 228 document.getElementById(targetID).appendChild(this.fileProgressWrapper);229 fadeIn(this.fileProgressWrapper, 0);230 231 } else {232 this.fileProgressElement = this.fileProgressWrapper.firstChild;233 this.fileProgressElement.childNodes[1].firstChild.nodeValue = file.name;234 }235 236 this.height = this.fileProgressWrapper.offsetHeight;237 238 }239 FileProgress.prototype.setProgress = function (percentage) {240 this.fileProgressElement.className = "progressContainer green";241 this.fileProgressElement.childNodes[3].className = "progressBarInProgress";242 this.fileProgressElement.childNodes[3].style.width = percentage + "%";243 };244 FileProgress.prototype.setComplete = function () {245 this.fileProgressElement.className = "progressContainer blue";246 this.fileProgressElement.childNodes[3].className = "progressBarComplete";247 this.fileProgressElement.childNodes[3].style.width = "";248 249 };250 FileProgress.prototype.setError = function () {251 this.fileProgressElement.className = "progressContainer red";252 this.fileProgressElement.childNodes[3].className = "progressBarError";253 this.fileProgressElement.childNodes[3].style.width = "";254 255 };256 FileProgress.prototype.setCancelled = function () {257 this.fileProgressElement.className = "progressContainer";258 this.fileProgressElement.childNodes[3].className = "progressBarError";259 this.fileProgressElement.childNodes[3].style.width = "";260 261 };262 FileProgress.prototype.setStatus = function (status) {263 this.fileProgressElement.childNodes[2].innerHTML = status;264 };265 FileProgress.prototype.toggleCancel = function (show, swfuploadInstance) {266 this.fileProgressElement.childNodes[0].style.visibility = show ? "visible" : "hidden";267 if (swfuploadInstance) {268 var fileID = this.fileProgressID;269 this.fileProgressElement.childNodes[0].onclick = function () {270 swfuploadInstance.cancelUpload(fileID);271 return false;272 };273 }274 };
handlers.js 文件