ajax图片上传(asp.net +jquery+ashx)

浏览数：21 / 时间：2015年06月09日

一、建立Default.aspx页面

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ajax图片上传</title>
<script src="js/jquery-1.3.2.min.js" type="text/javascript"></script>
<script src="js/jquery.form.js" type="text/javascript"></script>
<script type="text/javascript">
function upload(){
var path = document.getElementById("File1").value;
var img = document.getElementById("img1");
if($.trim(path)==""){
alert("请选择要上传的文件");
return;
}
$("#form1").ajaxSubmit({
success: function (str) {
if(str!=null && str!="undefined"){
if (str == "1") {alert("上传成功");document.getElementById("img1").src="images/logo.jpg?"+new Date();/*上传后刷新图片*/}
else if(str=="2"){alert("只能上传jpg格式的图片");}
else if(str=="3"){alert("图片不能大于1M");}
else if(str=="4"){alert("请选择要上传的文件");}
else {alert(‘操作失败！‘);}
}
else alert(‘操作失败！‘);
},
error: function (error) {alert(error);},
url:‘Handler.ashx‘, /*设置post提交到的页面*/
type: "post", /*设置表单以post方法提交*/
dataType: "text" /*设置返回值类型为文本*/
});
}
</script>
</head>
<body>
<form id="form1" runat="server">
<input id="File1" name="File1" type="file" />
<input id="iptUp" type="button" value="上传Logo" onclick="upload()"/>
<img id="img1" alt="网站Logo" src="images/weblogo.jpg" />
</form>
</body>
</html>

二、新建一个一般处理文件Handler.ashx

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<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
HttpPostedFile _upfile = context.Request.Files["File1"];
if (_upfile == null)
{
ResponseWriteEnd(context, "4");//请选择要上传的文件
}
else
{
string fileName = _upfile.FileName;/*获取文件名： C:\Documents and Settings\Administrator\桌面\123.jpg*/
string suffix = fileName.Substring(fileName.LastIndexOf(".") + 1).ToLower();/*获取后缀名并转为小写： jpg*/
int bytes = _upfile.ContentLength;//获取文件的字节大小
if (suffix != "jpg")
ResponseWriteEnd(context, "2"); //只能上传JPG格式图片
if (bytes > 1024 * 1024)
ResponseWriteEnd(context, "3"); //图片不能大于1M
_upfile.SaveAs(HttpContext.Current.Server.MapPath("~/images/logo.jpg"));//保存图片
ResponseWriteEnd(context, "1"); //上传成功
}
}
private void ResponseWriteEnd(HttpContext context, string msg)
{
context.Response.Write(msg);
context.Response.End();
}
public bool IsReusable {
get {
return false;
}
}
}