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js 下载图片与下载文件的方式一样;保存至本地 ASP.NET 方式

2016-01-22 15:35 826 查看
<asp:Button ID="btnDownLoad" runat="server"  style="display: none" Text="a" OnClick="btnDownLoad_Click"  TabIndex="100" />
<asp:HiddenField ID="hidImageUrl" runat="server" />


public partial class WebForm : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
}

protected void btnDownLoad_Click(object sender, EventArgs e)
{
try
{
if (!string.IsNullOrWhiteSpace(hidImageUrl.Value))
{
Response.Buffer = true;
Response.AddHeader("Accept-Language", "zh-tw");
string content = hidImageUrl.Value;
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(content);
req.Timeout = 10000;
HttpWebResponse rep = (HttpWebResponse)req.GetResponse();
Stream s = rep.GetResponseStream();
hidImageUrl.Value = "";
Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpeg", System.Text.Encoding.UTF8));//attachment
Response.ContentType = "image/jpeg;charset=gbk";
System.Drawing.Image img = System.Drawing.Image.FromStream(s);
img.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
s.Close();
rep.Close();
Response.End();
}
}
catch (Exception ex)
{
Response.Write("请联系管理员!" + ex.ToString());
}

}

}
}


<a  href='#' id='loadimg' onclick=\"downloadFile('sss','" + ImageUrl + "')\" class='btn btn-link text-dec' > 下载</a>


function downloadFile(fileName, content) {
$('#ContentPlaceHolder1_hidImageUrl').val(content);
$('#ContentPlaceHolder1_btnDownLoad').click();

return false;
}


以上代码主要是通过JS代码调用服务器控件的OnClick事件;在后台把图片下载后保存至Response流中;实现类似下载Excel文件的功能
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