文件上传这个我看来有两种上传方法：一、上传到服务器上把文件地址存入数据库中 二、直接把文件以字节数存储
第一种方式比较常见：可以使用文件流的形式把文件写入到服务器端。
今天主要说明第二种方法：
因为我做的是web项目，所以上传工具就用到了FileUpload控件如何实现的呢，不废话上代码
default.aspx
<head runat="server">
<title></title>
<script type="text/javascript">
function UploadFile() {
var frmUpload = ifu.document.getElementById("frmUpload");
//在本地测试这种取值会报错，好像是我本机的IE有问题导致的
//var fuFileUpload = frmUpload.document.getElementById("fuFileUpload");
//var btnFileUpload = frmUpload.document.getElementById("btnFileUpload");
var fuFileUpload = frmUpload.fuFileUpload;
var btnFileUpload = frmUpload.btnFileUpload;
try {
fuFileUpload.click();
}
catch (e) {
return false;
}
if (fuFileUpload.value != "") {
btnFileUpload.click();
}
}
function ShowMsgAndRefresh() {
document.getElementById('<%=btnHidView.ClientID%>').click();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<iframe id="ifu" src="AttachFileUpload.aspx" style="display: none;"></iframe>
<asp:Button ID="btnHidView" runat="server" Style="display: none;" OnClick="btnHidView_Click" />
<asp:LinkButton ID="lbtnAttachFiles" runat="server" OnClick="lbtnAttachFiles_Click"
Width="160px" CssClass="ShortNameShow"></asp:LinkButton>
<div style="float: left; margin: 24px 10px 0px 10px;">
<asp:Button ID="btnRecordDelete" runat="server" Text="附件" OnClick="btnRecordDelete_Click" /></div>
</form>
</body>
这里把文件上传单独放到一个页面，我们利用iframe来加载【附件 AttachFileUpload】的页面
AttachFileUpload.aspx
<form id="frmUpload" runat="server" style="height: auto;">
<div >
<asp:FileUpload ID="fuFileUpload" runat="server" Style="height: 0px;display: none;" />
<asp:Button ID="btnFileUpload" runat="server" Text="Button"
Style="height: 0px;display: none;" onclick="btnFileUpload_Click" />
</div>
</form>
AttachFileUpload.aspx.cs
protected void btnFileUpload_Click(object sender, EventArgs e)
{
string l_strFullName = fuFileUpload.PostedFile.FileName;
string l_strFileName = l_strFullName.Substring(l_strFullName.LastIndexOf("\") + 1);
try
{
byte[] l_bytFile = fuFileUpload.f.FileBytes;
Session["FileName"] = l_strFileName;
Session["FileData"] = l_bytFile;
ClientScript.RegisterStartupScript(this.GetType(), "ShowMsgAndRefresh", "parent.ShowMsgAndRefresh()", true);
}
catch
{
return;
}
}
Default.aspx.cs
/// <summary>
/// 附件下载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lbtnAttachFiles_Click(object sender, EventArgs e)
{
string l_strFileName = Session["FileName"].ToString();
byte[] l_bytFileData = Session["FileData"] as byte[];
HttpContext.Current.Response.Clear();
l_strFileName = System.Web.HttpUtility.UrlEncode(l_strFileName);
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + l_strFileName);
if (l_bytFileData.Length == 0)
{
l_bytFileData = System.Text.Encoding.Unicode.GetBytes(" ");
}
HttpContext.Current.Response.BinaryWrite(l_bytFileData);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
/// <summary>
/// 附件添加删除处理
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnRecordDelete_Click(object sender, EventArgs e)
{
if (btnRecordDelete.Text.Trim() == "附件")
{
ClientScript.RegisterStartupScript(this.Page.GetType(), "OpenFileDialogAndInsert", "<Script language=JavaScript>window.attachEvent('onload',UploadFile);</Script>");
}
else if (btnRecordDelete.Text.Trim() == "删除")
{
Session["FileName"] = string.Empty;
Session["FileData"] = null;
lbtnAttachFiles.Text = Session["FileName"].ToString();
//lbtnAttachFiles.ToolTip = Session["FileName"].ToString();
btnRecordDelete.Text = "附件";
}
}
/// <summary>
/// 附件添加完成后的处理
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnHidView_Click(object sender, EventArgs e)
{
lbtnAttachFiles.Text = Session["FileName"].ToString();
//lbtnAttachFiles.ToolTip = Session["FileName"].ToString();
if (!string.IsNullOrEmpty(lbtnAttachFiles.Text.Trim()))
{
btnRecordDelete.Text = "删除";
}
}