<body>
<form id="form1" runat="server">
<div>
<span style="color: #ff0000">
目前首页上的图片：</span><br />
<asp:Image ID="Image1" runat="server" Height="180px" Width="235px" />
<asp:Image ID="Image2" runat="server" Height="180px" Width="235px" />
<asp:Image ID="Image3" runat="server" Height="180px" Width="235px" />
<asp:Image ID="Image4" runat="server" Height="180px" Width="235px" />
<br />
<br />
<span style="color: #ff0000">选择替换需要显示在主页动态图片的新闻（注：最多只能选4项）</span><br />
<table style="width: 374px; border-color:Red;" border=1 cellpadding=0 cellspacing=0 >
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload1" runat="server" /></td>
<td style="width: 100px">
<asp:Button ID="Button1" runat="server" Text="替换图片一" OnClick="Button1_Click" /></td>
</tr>
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload2" runat="server" /></td>
<td style="width: 100px">
<asp:Button ID="Button3" runat="server" Text="替换图片二" OnClick="Button3_Click" /></td>
</tr>
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload3" runat="server" /></td>
<td style="width: 100px">
<asp:Button ID="Button4" runat="server" Text="替换图片三" OnClick="Button4_Click" /></td>
</tr>
<tr>
<td style="width: 100px">
<asp:FileUpload ID="FileUpload4" runat="server" /></td>
<td style="width: 100px">
<asp:Button ID="Button5" runat="server" Text="替换图片四" OnClick="Button5_Click" /></td>
</tr>
</table>
<br />
</div>
</form>
</body>
前台如图所示：
四张图片的文件名为pic1,pic2,pic3,pic4
我上传的图片需要改成其中一张, 思路是先通过上传到服务器这些图片所在的文件夹IMAGE中，然后再修改文件名。
修改文件名的思路是先COPY在删除源文件。
后台代码如下：先要引用SYSTEM.IO
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
imagebind();
}
}
private void imagebind()
{
Image1.ImageUrl = "image/pic1.jpg";
Image2.ImageUrl = "image/pic2.jpg";
Image3.ImageUrl = "image/pic3.jpg";
Image4.ImageUrl = "image/pic4.jpg";
}
protected void Button1_Click(object sender, EventArgs e)
{
tihuan(FileUpload1, "pic1.jpg");
}
protected void Button3_Click(object sender, EventArgs e)
{
tihuan(FileUpload2, "pic2.jpg");
}
protected void Button4_Click(object sender, EventArgs e)
{
tihuan(FileUpload3, "pic3.jpg");
}
protected void Button5_Click(object sender, EventArgs e)
{
tihuan(FileUpload4, "pic4.jpg");
}
private void tihuan(FileUpload myFileUpload,string newname)
{
bool b = Upload(myFileUpload); //
if (!b)
{
return;
}
string OrignFile, NewFile;
OrignFile = Server.MapPath(".") + "\\image\\"+myFileUpload.FileName;
NewFile = Server.MapPath(".") + "\\image\\"+newname;
File.Copy(OrignFile, NewFile, true);
File.Delete(OrignFile);
}
private bool Upload(FileUpload myFileUpload)
{
bool flag = false;
//是否允许上载
bool fileAllow = false;
//设定允许上载的扩展文件名类型
string[] allowExtensions = { ".jpeg", ".gif", ".bmp", ".png", ".jpg", ".tiff" };
//取得网站根目录路径
string path = HttpContext.Current.Request.MapPath("image/");
//检查是否有文件案
if (myFileUpload.HasFile)
{
//myFileUpload.FileName = "pic1111111.jpg";
//取得上传文件之扩展文件名，并转换成小写字母
string fileExtension = System.IO.Path.GetExtension(myFileUpload.FileName).ToLower();
//检查扩展文件名是否符合限定类型
for (int i = 0; i < allowExtensions.Length; i++)
{
if (fileExtension == allowExtensions[i])
{
fileAllow = true;
}
}
if (fileAllow)
{
try
{
//存储文件到文件夹
myFileUpload.SaveAs(path + myFileUpload.FileName);
flag = true;
}
catch (Exception ex)
{
PubClass.ShowMessageBox(Page, ex.Message);
flag = false;
}
}
else
{
PubClass.ShowMessageBox(Page, "不允许上载：" + myFileUpload.PostedFile.FileName + "，只能上传图片文件，请检查！");
flag = false;
}
}
else
{
PubClass.ShowMessageBox(Page, "请选择要上传的图片文件!");
flag = false;
}
return flag;
}
最关键的语言：
string OrignFile, NewFile;
OrignFile = Server.MapPath(".") + "\\image\\"+myFileUpload.FileName;
NewFile = Server.MapPath(".") + "\\image\\"+newname;
File.Copy(OrignFile, NewFile, true);
File.Delete(OrignFile);
代码很简单，想法也很清楚。
请高手给给更简单的方式实现文件上传并修改文件名。谢谢
