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一、前台页面
<!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>
<script src="js/jquery-1.8.2.min.js" type="text/javascript"></script>
<script src="js/ajaxfileupload.js"></script>
<script type="text/javascript">
function CheckFile() {
$.ajaxFileUpload({
url: ‘upload.ashx?time=‘ + new Date(),
secureuri: false,
fileElementId: ‘fuFileLoad‘, //上传控件ID
dataType: ‘json‘, //返回值类型 一般设置为json
success: function (data, status) {
var jsonData = $.parseJSON(data);
alert(jsonData.Eor);
if (jsonData.Eor == "succss") {
alert(jsonData.Msg);
} else {
alert(jsonData.Msg);
}
},
error: function (data, status, e) {
alert(e); //就是在这弹出“语法错误”
}
});
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:FileUpload ID="fuFileLoad" runat="server" onchange="CheckFile();" />
</form>
</body>
</html>
二、上传功能代码 upload.ashx
using System;
using System.IO;
using System.Web;
using System.Web.Script.Serialization;
public class upload : IHttpHandler {
public void ProcessRequest (HttpContext context) {
//文件大小限制10M
const int maxSize = 10485760;
//定义允许上传的文件扩展名
var ext = new[] { "rar", "zip", "gif", "jpg", "jpeg", "png", "bmp", "xls", "xlsx", "doc", "docx", "et", "wps" };
string strExt = "";
foreach (var a in ext)
{
strExt += a + "/";
}
strExt = strExt.TrimEnd(‘/‘);
string savePath = "/upLoads/"; //文件保存路径
var resp = new UploadResponse();
HttpFileCollection imgFile = context.Request.Files;
if (imgFile.Count > 0)
{
string fileExt = Path.GetExtension(imgFile[0].FileName); //获得扩展名
if (string.IsNullOrEmpty(fileExt) || Array.IndexOf(ext, fileExt.Substring(1).ToLower()) < 0)
{
resp.Eor = "error";
resp.Msg = string.Format("扩展名为{0}的文件不允许上传!\n只允许上传{1}格式的文件。", fileExt, strExt);
}
else
{
if (imgFile[0].InputStream.Length > maxSize)
{
resp.Eor = "error";
resp.Msg = "上传文件大小超过限制！";
}
else
{
string fileNewName = DateTime.Now.ToString("yyyyMMddHHmmssffff") + fileExt; //新的文件名
try
{
SaveFile(imgFile[0], context.Server.MapPath(savePath), fileNewName); //保存文件
resp.Eor = "succss";
resp.Msg = "上传成功! 文件大小为:" + imgFile[0].ContentLength;
resp.ImgUrl = savePath + fileNewName;
resp.FName = fileNewName;
resp.OName = imgFile[0].FileName;
}
catch (Exception ex)
{
resp.Eor = "error";
resp.Msg = ex.ToString();
}
}
}
}
else
{
resp.Eor = "error";
resp.Msg = "请选择文件!";
}
context.Response.ContentType = "text/html";
context.Response.Write(new JavaScriptSerializer().Serialize(resp));
context.Response.End();
}
private void SaveFile(HttpPostedFile imgFile, string savePath, string fileName)
{
if (!Directory.Exists(savePath)) //判断文件存放路径是否存在
{
Directory.CreateDirectory(savePath);
}
imgFile.SaveAs(Path.Combine(savePath, fileName));
}
public class UploadResponse
{
public string Eor { get; set; }
public string Msg { get; set; }
public string ImgUrl { get; set; }
public string FName { get; set; }
public string OName { get; set; }
}
public bool IsReusable {
get {
return false;
}
}
}
三、返回的json数据调整
四、源代码下载地址：http://pan.baidu.com/s/1jGo1wzW
热烈欢迎大家吐槽。
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原文地址：http://www.cnblogs.com/wsk198726/p/4773353.html
