网站后台都需要有上传图片的功能，下面的例子就是实现有关图片上传。缺点：图片上传到本服务器上，不适合大量图片上传
第一、图片上传，代码如下：
xxx.aspx
代码如下:
<td class="style1">
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="上传一般图片" onclick="Button1_Click" />
</td>
<td class="style3">
<asp:Image ID="Image1" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
代码如下:
protected void Button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
string FileName = System.IO.Path.GetFileName(file.FileName);
string[] SplitFileName = FileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss")+"." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image1.ImageUrl = "upload/" + AtterFileName;
}
}
else
{
Response.Write("<script>alert('该文件不是图片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('请选择要上传的图片');</script>");
}
}
}
第二、添加文字水印的图片上传，代码如下：
xxx.aspx
代码如下:
<td class="style1">
<asp:FileUpload ID="FileUpload2" runat="server" />
<asp:Button ID="Button2" runat="server" Text="上传文字图片" onclick="Button2_Click" />
</td>
<td>
<asp:Image ID="Image2" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
代码如下:
protected void Button2_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
using (Graphics g = Graphics.FromImage(img))
{
g.DrawString("我的图片", new Font("宋体", 14), Brushes.Red, 0, 0);
}
string FileName = System.IO.Path.GetFileName(file.FileName);
string[] SplitFileName = FileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image2.ImageUrl = "upload/" + AtterFileName;
}
}
else
{
Response.Write("<script>alert('该文件不是图片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('请选择要上传的图片');</script>");
}
}
}
第三、添加图片水印的图片上传，代码如下：
xxx.aspx
代码如下:
<td class="style1">
<asp:FileUpload ID="FileUpload3" runat="server" />
<asp:Button ID="Button3" runat="server" Text="上传水印图片" onclick="Button3_Click" />
</td>
<td>
<asp:Image ID="Image3" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
代码如下:
protected void Button3_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
string fileName = file.FileName;
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
using (System.Drawing.Image imgWater = System.Drawing.Image.FromFile(Server.MapPath("/img/czlogo.jpg")))
{
using (Graphics g = Graphics.FromImage(img))
{
g.DrawImage(imgWater, 0, 0);
}
string[] SplitFileName = fileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image3.ImageUrl = "upload/" + AtterFileName;
}
}
}
else
{
Response.Write("<script>alert('该文件不是图片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('请选择要上传的图片');</script>");
}
}
}
第四、上传图片浓缩图，代码如下：
xxx.aspx
代码如下:
<td class="style1">
<asp:FileUpload ID="FileUpload4" runat="server" />
<asp:Button ID="Button4" runat="server" Text="上传浓缩图片" onclick="Button4_Click" />
</td>
<td>
<asp:Image ID="Image4" runat="server" Height="200px" Width="200px" />
</td>
xxx.aspx.cs
代码如下:
protected void Button4_Click(object sender, EventArgs e)
{
for (int i = 0; i < Request.Files.Count; i++)
{
HttpPostedFile file = Request.Files[i];
if (file.ContentLength > 0)
{
if (file.ContentType.Contains("image/"))
{
using (System.Drawing.Image img = System.Drawing.Image.FromStream(file.InputStream))
{
using (System.Drawing.Image imgThumb = new Bitmap(200, 100))
{
using (Graphics g = Graphics.FromImage(imgThumb))
{
g.DrawImage(img, new Rectangle(0, 0, imgThumb.Width, imgThumb.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
}
string fileName = file.FileName;
string[] SplitFileName = fileName.Split('.');
string AtterFileName = DateTime.Now.ToString("yyyMMddHHmmss") + "." + SplitFileName[1];
img.Save(Server.MapPath("/upload/" + AtterFileName));
this.Image4.ImageUrl = "upload/" + AtterFileName;
}
}
}
else
{
Response.Write("<script>alert('该文件不是图片格式！');</script>");
}
}
else
{
Response.Write("<script>alert('请选择要上传的图片');</script>");
}
}
}