/// <summary> /// 获取缩略图 /// </summary> public class GetThumbHandler : IHttpHandler, IRequiresSessionState { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; //获取缩略图id string id = context.Request.QueryString["id"]; //id为空则返回错误 if (String.IsNullOrEmpty(id)) { context.Response.StatusCode = 404; context.Response.Write("Not Found"); context.Response.End(); return; } //从Session中获取缩略图文件 Thumbnail thumb= context.Session["file_info"] as Thumbnail; //判断id是否一致 if (thumb.ID == id) { //重新设置响应MIME 类型 context.Response.ContentType = "image/png"; //输出二进制流信息 context.Response.BinaryWrite(thumb.Data); //截止输出 context.Response.End(); return; } //没有找到相应图片，返回404 context.Response.StatusCode = 404; context.Response.Write("Not Found"); context.Response.End(); } public bool IsReusable { get { return false; } } }
handlers.js 文件
function fileQueueError(file, errorCode, message) { try { var imageName = "error.gif"; var errorName = ""; if (errorCode == SWFUpload.errorCode_QUEUE_LIMIT_EXCEEDED) { errorName = "上传文件过多！"; } if (errorName != "") { alert(errorName); return; } switch (errorCode) { case SWFUpload.QUEUE_ERROR.ZERO_BYTE_FILE: imageName = "zerobyte.gif"; break; case SWFUpload.QUEUE_ERROR.FILE_EXCEEDS_SIZE_LIMIT: imageName = "toobig.gif"; break; case SWFUpload.QUEUE_ERROR.ZERO_BYTE_FILE: case SWFUpload.QUEUE_ERROR.INVALID_FILETYPE: default: alert(message); break; } //添加图片，注意路径 addImage("/swfupload/images/" + imageName); } catch (ex) { this.debug(ex); } } function fileDialogComplete(numFilesSelected, numFilesQueued) { try { if (numFilesQueued > 0) { this.startUpload(); } } catch (ex) { this.debug(ex); } } function uploadProgress(file, bytesLoaded) { try { var percent = Math.ceil((bytesLoaded / file.size) * 100); var progress = new FileProgress(file, this.customSettings.upload_target); progress.setProgress(percent); if (percent === 100) { progress.setStatus("正在创建缩略图..."); progress.toggleCancel(false, this); } else { progress.setStatus("正在上传..."); progress.toggleCancel(true, this); } } catch (ex) { this.debug(ex); } } function uploadSuccess(file, serverData) { try { //添加缩略图~~~ //修改这里来设置生成缩略图的页面 addImage("/Handlers/GetThumbHandler.ashx?id=" + serverData); var progress = new FileProgress(file, this.customSettings.upload_target); progress.setStatus("缩略图创建成功！"); progress.toggleCancel(false); } catch (ex) { this.debug(ex); } } function uploadComplete(file) { try { /* I want the next upload to continue automatically so I'll call startUpload here */ if (this.getStats().files_queued > 0) { this.startUpload(); } else { var progress = new FileProgress(file, this.customSettings.upload_target); progress.setComplete(); progress.setStatus("图片上传成功"); progress.toggleCancel(false); } } catch (ex) { this.debug(ex); } } function uploadError(file, errorCode, message) { var imageName = "error.gif"; var progress; try { switch (errorCode) { case SWFUpload.UPLOAD_ERROR.FILE_CANCELLED: try { progress = new FileProgress(file, this.customSettings.upload_target); progress.setCancelled(); progress.setStatus("上传操作被取消"); progress.toggleCancel(false); } catch (ex1) { this.debug(ex1); } break; case SWFUpload.UPLOAD_ERROR.UPLOAD_STOPPED: try { progress = new FileProgress(file, this.customSettings.upload_target); progress.setCancelled(); progress.setStatus("上传停止！"); progress.toggleCancel(true); } catch (ex2) { this.debug(ex2); } case SWFUpload.UPLOAD_ERROR.UPLOAD_LIMIT_EXCEEDED: imageName = "uploadlimit.gif"; break; default: alert(message); break; } addImage("/swfupload/images/" + imageName); } catch (ex3) { this.debug(ex3); } } function addImage(src) { var newImg = document.createElement("img"); newImg.style.margin = "5px"; document.getElementById("thumbnails").appendChild(newImg); if (newImg.filters) { try { newImg.filters.item("DXImageTransform.Microsoft.Alpha").opacity = 0; } catch (e) { // If it is not set initially, the browser will throw an error. This will set it if it is not set yet. newImg.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + 0 + ')'; } } else { newImg.style.opacity = 0; } newImg.onload = function () { fadeIn(newImg, 0); }; newImg.src = src; } function fadeIn(element, opacity) { var reduceOpacityBy = 5; var rate = 30; // 15 fps if (opacity < 100) { opacity += reduceOpacityBy; if (opacity > 100) { opacity = 100; } if (element.filters) { try { element.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity; } catch (e) { // If it is not set initially, the browser will throw an error. This will set it if it is not set yet. element.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + opacity + ')'; } } else { element.style.opacity = opacity / 100; } } if (opacity < 100) { setTimeout(function () { fadeIn(element, opacity); }, rate); } } /* ****************************************** * FileProgress Object * Control object for displaying file info * ****************************************** */ function FileProgress(file, targetID) { this.fileProgressID = "divFileProgress"; this.fileProgressWrapper = document.getElementById(this.fileProgressID); if (!this.fileProgressWrapper) { this.fileProgressWrapper = document.createElement("div"); this.fileProgressWrapper.className = "progressWrapper"; this.fileProgressWrapper.id = this.fileProgressID; this.fileProgressElement = document.createElement("div"); this.fileProgressElement.className = "progressContainer"; var progressCancel = document.createElement("a"); progressCancel.className = "progressCancel"; progressCancel.href = "#"; progressCancel.style.visibility = "hidden"; progressCancel.appendChild(document.createTextNode(" ")); var progressText = document.createElement("div"); progressText.className = "progressName"; progressText.appendChild(document.createTextNode(file.name)); var progressBar = document.createElement("div"); progressBar.className = "progressBarInProgress"; var progressStatus = document.createElement("div"); progressStatus.className = "progressBarStatus"; progressStatus.innerHTML = " "; this.fileProgressElement.appendChild(progressCancel); this.fileProgressElement.appendChild(progressText); this.fileProgressElement.appendChild(progressStatus); this.fileProgressElement.appendChild(progressBar); this.fileProgressWrapper.appendChild(this.fileProgressElement); document.getElementById(targetID).appendChild(this.fileProgressWrapper); fadeIn(this.fileProgressWrapper, 0); } else { this.fileProgressElement = this.fileProgressWrapper.firstChild; this.fileProgressElement.childNodes[1].firstChild.nodeValue = file.name; } this.height = this.fileProgressWrapper.offsetHeight; } FileProgress.prototype.setProgress = function (percentage) { this.fileProgressElement.className = "progressContainer green"; this.fileProgressElement.childNodes[3].className = "progressBarInProgress"; this.fileProgressElement.childNodes[3].style.width = percentage + "%"; }; FileProgress.prototype.setComplete = function () { this.fileProgressElement.className = "progressContainer blue"; this.fileProgressElement.childNodes[3].className = "progressBarComplete"; this.fileProgressElement.childNodes[3].style.width = ""; }; FileProgress.prototype.setError = function () { this.fileProgressElement.className = "progressContainer red"; this.fileProgressElement.childNodes[3].className = "progressBarError"; this.fileProgressElement.childNodes[3].style.width = ""; }; FileProgress.prototype.setCancelled = function () { this.fileProgressElement.className = "progressContainer"; this.fileProgressElement.childNodes[3].className = "progressBarError"; this.fileProgressElement.childNodes[3].style.width = ""; }; FileProgress.prototype.setStatus = function (status) { this.fileProgressElement.childNodes[2].innerHTML = status; }; FileProgress.prototype.toggleCancel = function (show, swfuploadInstance) { this.fileProgressElement.childNodes[0].style.visibility = show ? "visible" : "hidden"; if (swfuploadInstance) { var fileID = this.fileProgressID; this.fileProgressElement.childNodes[0].onclick = function () { swfuploadInstance.cancelUpload(fileID); return false; }; } };