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第一:建立Default.aspx页面
<html> <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
<%@ 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; } } }
可以按照自己的需求来修改,希望对您有帮助!
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原文地址:http://www.cnblogs.com/netserver/p/4525207.html