复制代码 代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="upload.aspx.cs" Inherits="upload" %>
<!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>
<style type="text/css">
li
{
list-style: none;
padding-top: 10px;
}
</style>
<script type="text/javascript" src="https://www.jb51.net/js/jquery-1.6.2.min.js"></script>
<script type="text/javascript">
function ValidImage(id, msg) {
$(id).parent().append("<span>" + msg + "</span>");
return false;
}
</script>
</head>
<body>
<form runat="server" enctype="multipart/form-data" method="post">
<div>
<ul>
<li>
<input type="file" />
</li>
<li>
<input type="file" />
</li>
<li>
<input type="file" />
</li>
<li>
<input type="file" /></li>
<li>
<input type="file" />
</li>
<li>
<input type="submit" runat="server" onserverclick="btnPostFile_ServerClick" value="开始上传" />
</li>
</ul>
</div>
</form>
</body>
</html>
前台就是几个控件和一个ValidImage方法。
后台代码：
复制代码 代码如下:
protected void btnPostFile_ServerClick(object sender, EventArgs e)
{
string filePath = Server.MapPath("/uploadImg");
const int size = 5242880;
if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}
if (Request.Files.Count > 0)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile postFile = Request.Files[i];
string uploadFileID = string.Format("#upload{0}", i + 1); //当前的上传控件ID,因为jquery要调用就加了#
string msg = null; //提示信息
if (postFile.FileName.Trim().Length <= 0)
{
continue;
}
if (postFile.ContentLength > size)
{
msg = "文件太大";
Page.ClientScript.RegisterStartupScript(GetType(), "", "ValidImage(" + uploadFileID + "," + msg + ")", true);//将提示信息发送到客户端
continue;
}
string savePath = Path.Combine(filePath, postFile.FileName); //图片的保存地址
if (!File.Exists(savePath))
{
postFile.SaveAs(Path.Combine(filePath, postFile.FileName)); //如果文件不存在就保存
}
else
{
msg = "文件" + postFile.FileName + "已经存在";
Page.ClientScript.RegisterStartupScript(GetType(), "", "ValidImage(" + uploadFileID + "," + msg + ")", true);//将提示信息发送到客户端
continue;
}
if (IsImg(savePath)) //通过IsImg方法验证文件是否是图片，或者格式是否正确
{
SmallImg(postFile.InputStream, postFile.FileName);
}
else
{
msg = "只能上传JGP、PNG类型的图片，请检查文件格式是否正确";
Page.ClientScript.RegisterStartupScript(GetType(), "", "ValidImage(" + uploadFileID + "," + msg + ")", true);//将提示信息发送到客户端
File.Delete(savePath); //如果不是图片就删除
}
}
}
}
复制代码 代码如下: