標籤：style blog class code java ext
利用jQuery的ajax函數就可以實現非同步上傳圖片了。一開始我是想在處理常式中，直接用context.Request.Files來擷取頁面中的input file，但是不知道為什麼一次擷取不了。網上說的，Form中要設定enctype="multipart/form-data"和 method="post"，input file中要加runat="server"，但都加了依然擷取不到。哪位大俠知道的，求指教啊。
既然後台擷取不到Input file怎麼辦呢。其實我們上傳檔案，主要是擷取到檔案的物理地址就行了。只要有了這個檔案地址就可以用bitmap擷取到這個圖片了。
剛開始我是想用ajax GET來傳送地址，但TMD如果檔案名稱有中文就亂碼了。好在後面改成POST後就可以成功傳送了。
話不多說，上代碼：
前台：
<html xmlns="http://www.w3.org/1999/xhtml"><head id="Head1" runat="server"> <title></title> <script src="Scripts/jquery-1.3.2-vsdoc2.js" type="text/javascript"></script> <script type="text/javascript"> function uploadImage() { //判斷是否有選擇上傳檔案 var imgPath = $("#uploadFile").val(); if (imgPath == "") { alert("請選擇上傳圖片！"); return; } //判斷上傳檔案的尾碼名 var strExtension = imgPath.substr(imgPath.lastIndexOf(‘.‘) + 1); if (strExtension != ‘jpg‘ && strExtension != ‘gif‘ && strExtension != ‘png‘ && strExtension != ‘bmp‘) { alert("請選擇圖片檔案"); return; } $.ajax({ type: "POST", url: "handler/UploadImageHandler.ashx", data: { imgPath: $("#uploadFile").val() }, cache: false, success: function(data) { alert("上傳成功"); $("#imgDiv").empty(); $("#imgDiv").html(data); $("#imgDiv").show(); }, error: function(XMLHttpRequest, textStatus, errorThrown) { alert("上傳失敗，請檢查網路後重試"); } }); } </script></head><body><form enctype="multipart/form-data" method="post"><input type="file" id="uploadFile" runat="server" /><input type="button" id="btnUpload" value="確定" onclick="uploadImage()" /><div id="imgDiv"></div></form></body></html>
後台中的ashx:
public void ProcessRequest (HttpContext context) { //不知道為什麼擷取不到 //HttpPostedFile file = context.Request.Files["userFile"]; string filePath = context.Request["imgPath"]; string path = "UploadImgs\\"; Bitmap map = new Bitmap(filePath); string fileName = Path.GetFileName(filePath); string mapPath = context.Server.MapPath("~"); string savePath = mapPath + "\\" + path + fileName; map.Save(savePath); //上傳成功後顯示IMG檔案 StringBuilder sb = new StringBuilder(); sb.Append("<img id=\"imgUpload\" src=\""+path.Replace("\\","/")+fileName+"\" />"); context.Response.Write(sb.ToString()); context.Response.End(); } public bool IsReusable { get { return false; } }
出處：http://blog.csdn.net/highplayer/article/details/7392337#html
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