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asp.net 自定义控件实现无刷新上传图片,立即显示缩略图,保存图片缩略图

发布于 2016-06-29 13:38:21 | 132 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的精品教程，程序狗速度看过来！

ASP.NET

ASP.NET 是.NET FrameWork的一部分，是一项微软公司的技术，是一种使嵌入网页中的脚本可由因特网服务器执行的服务器端脚本技术，它可以在通过HTTP请求文档时再在Web服务器上动态创建它们。 指 Active Server Pages（动态服务器页面） ，运行于 IIS（Internet Information Server 服务，是Windows开发的Web服务器）之中的程序 。

自定义控件实现无刷新上传图片,立即显示缩略图,保存图片缩略图

如图:

点击浏览,选择图片之后,右面显示图片

第一步:

创建CtFileUpLoad.ascx

 
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="CtFileUpLoad.ascx.cs" 
Inherits="WebParts_CtFileUpLoad" %> 
<table cellpadding="0" cellspacing="0"> 
<tr> 
<td> 
<iframe src="/WebParts/FileUpLoad.aspx?<%=ParsValue %>" width="240px" height="22px" frameborder="0" scrolling="no"></iframe> 
</td> 
<td> 
<asp:TextBox runat="server" ID="tbFileName" style="display:none"></asp:TextBox> 
<div id="dvImg" runat="server" style="position:absolute; margin-left:50px;"> 
</div> 
</td> 
</tr> 
</table> 
<script language="javascript"> 
function <%=ClientID %>CallLoaded() 
{ 
<% =OnLoaded %>; 
} 
</script> 


 
using System; 
using System.Collections; 
using System.Configuration; 
using System.Data; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.HtmlControls; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Drawing; 
public partial class WebParts_CtFileUpLoad : System.Web.UI.UserControl 
{ 
public bool AutoFileName 
{ 
get 
{ 
object ob = ViewState[ClientID + "AutoFileName"]; 
if (ob == null) 
ob = true; 
return (bool)ob; 
} 
set 
{ 
ViewState[ClientID + "AutoFileName"] = value; 
} 
} 
public string UpLoadPath 
{ 
get 
{ 
object ob = ViewState[ClientID + "UpLoadPath"]; 
if (ob == null) 
ob = "UPLOADFILES"; 
return ob.ToString(); 
} 
set 
{ 
ViewState[ClientID + "UpLoadPath"] = value; 
} 
} 
public string OnLoaded 
{ 
get 
{ 
object ob = ViewState[ClientID + "OnLoaded"]; 
if (ob == null) 
ob = ""; 
return ob.ToString(); 
} 
set 
{ 
ViewState[ClientID + "OnLoaded"] = value; 
} 
} 
public string SupportExtension 
{ 
get 
{ 
object ob = ViewState[ClientID + "SupportExtension"]; 
if (ob == null) 
{ 
ob = "gif|png|jpeg|jpg"; 
} 
return ob.ToString(); 
} 
set 
{ 
ViewState[ClientID + "SupportExtension"] = value.Replace(".", ""); 
} 
} 
public bool ShowImg 
{ 
get 
{ 
object ob = ViewState[ClientID + "ShowImg"]; 
if (ob == null) 
ob = true; 
return (bool)ob; 
} 
set 
{ 
if ((bool)value) 
dvImg.Style["display"] = "block"; 
else 
dvImg.Style["display"] = "none"; 
} 
} 
public string FileName 
{ 
get 
{ 
return tbFileName.Text; 
} 
} 
protected string ParsValue = ""; 
protected void Page_Load(object sender, EventArgs e) 
{ 
ParsValue = "AutoFileName=" + AutoFileName.ToString() + "&SupportExtension=" + SupportExtension + "&UpLoadPath=" + UpLoadPath 
+ "&ID=" + ClientID; 
} 
}

第二步:
创建FileUpLoad.aspx 
 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUpLoad.aspx.cs" Inherits="WebParts_FileUpLoad" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
</head> 
<body style="margin:0px;"> 
<form id="form1" runat="server"> 
<div> 
<asp:FileUpload runat="server" ID="FileUpload1" onchange="upload(this);" /> 
<asp:Button runat="server" ID="btUp" style="display:none" OnClick="btUp_Click" /> 
</div> 
</form> 
</body> 
</html> 
<script language="javascript"> 
function upload(ob) 
{ 
var expStr=/.*(<%=SupportExtension%>)$/i; 
if(!expStr.test(ob.value)) 
{ 
alert("上传文件类型有误。\n(支持文件类型：<%=SupportExtension%>)"); 
} 
else 
{ 
var btUp=document.getElementById("<%=btUp.ClientID %>"); 
btUp.click(); 
} 
} 
</script> 


 
using System; 
using System.Collections; 
using System.Configuration; 
using System.Data; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.HtmlControls; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Drawing; 
using System.IO; 
public partial class WebParts_FileUpLoad : System.Web.UI.Page 
{ 
protected string SupportExtension = ""; 
protected string UpLoadPath = ""; 
protected bool AutoFileName; 
protected string ParentID = ""; 
protected void Page_Load(object sender, EventArgs e) 
{ 
SupportExtension = Request.QueryString["SupportExtension"]; 
UpLoadPath = Request.QueryString["UpLoadPath"]; 
AutoFileName = bool.Parse(Request.QueryString["AutoFileName"].ToString()); 
ParentID = Request.QueryString["ID"].ToString(); 
} 
protected void btUp_Click(object sender, EventArgs e) 
{ 
Boolean fileOK = false; 
if (FileUpload1.HasFile) 
{ 
String fileExtension = 
System.IO.Path.GetExtension(FileUpload1.FileName).ToLower(); 
String[] allowedExtensions = SupportExtension.Split(new string[] { "|" }, StringSplitOptions.RemoveEmptyEntries); 
for (int i = 0; i < allowedExtensions.Length; i++) 
{ 
if (fileExtension == "." + allowedExtensions[i]) 
{ 
fileOK = true; 
} 
} 
if (fileOK) 
{ 
string path = ""; 
string name = ""; 
string sPath = ""; 
if (AutoFileName) 
{ 
name = DateTime.Now.Ticks.ToString() + System.IO.Path.GetExtension(FileUpload1.FileName).ToLower(); 
} 
else 
{ 
name = FileUpload1.FileName; 
} 
sPath = Request.PhysicalApplicationPath + "\\" + UpLoadPath + "\\"; 
path = sPath + name; //图片地址 
string fileName = name; //文件名 
string fileName_s = "s_" + name; //缩略图文件名称 
try 
{ 
//FileInfo file = new FileInfo(name); 
// string fileContentType = FileUpload1.PostedFile.ContentType; 
//string name = FileUpload1.PostedFile.FileName;//客户端文件路径 
//string fileName_sy = "sy_" + file.Name; //水印图文件名称(文字) 
//string fileName_syp = "syp_" + file.Name;//水印图文件名称(图片) 
//string webFilePath = Server.MapPath(UpLoadPath + "\\" + fileName); 
//string webFilePath_s = Server.MapPath(UpLoadPath + "\\" + fileName_s); 
string webFilePath = sPath + fileName;//服务器端文件路径 
string webFilePath_s = sPath + fileName_s;//服务器端缩略图路径 

if (!File.Exists(webFilePath)) 
{ 
if (FileUpload1.PostedFile.ContentLength < 2 * 1024 * 1024) //如果图片小于2M 
{ 
try 
{ 
FileUpload1.SaveAs(path); //使用saveAS方法保存文件 
System.Drawing.Image image = System.Drawing.Image.FromFile(path); 
if (image.Width > 800 || image.Height > 600) 
{ 
MakeThumbnail(webFilePath, webFilePath_s, 800, 600, "W");//生成缩略图的方法 
} 
else 
{ 
MakeThumbnail(webFilePath, webFilePath_s, 300, 230, "W");//生成缩略图的方法 
} 
image.Dispose(); 
// AddShuiYinWord(webFilePath, webFilePath_sy); //保存水印文字图片 
// AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);//保存添加水印图片之后的图片 
//MakeThumbnail(webFilePath, webFilePath_s, 400, 300, "W");//生成缩略图的方法 

Page.RegisterClientScriptBlock("succcess", @"<script> 
alert('上传成功'); 
parent.document.getElementById('" + ParentID + "_" + "tbFileName" + @"').value='" + fileName_s + @"'; 
</script>"); 
} 
catch (Exception ex) 
{ 
Page.RegisterClientScriptBlock("err", "<script>alert('提示：文件上传失败，失败原因：：" + ex.Message + "');</script>"); 
} 
} 
else 
{ 
Page.RegisterClientScriptBlock("err", "<script>alert('提示：图片不能大于2M');</script>"); 
} 
} 
else 
{ 
this.Page.RegisterClientScriptBlock("err", "<script>alert('图片重复');</script>"); 
} 
} 
catch (System.Exception err) 
{ 
this.Page.RegisterClientScriptBlock("err", "<script>alert('" + err.Message + "');</script>"); 
} 
try 
{ 
Bitmap bmp = new Bitmap(path); 
int width = 0, height = 0; 
int dvalue = 200; 
if (bmp.Width < dvalue & bmp.Height < 200) 
{ 
width = bmp.Width; 
height = bmp.Height; 
} 
else if (bmp.Width > bmp.Height) 
{ 
width = dvalue; 
height = dvalue * (bmp.Width / bmp.Height); 
} 
else 
{ 
height = dvalue; 
width = dvalue * (bmp.Height / bmp.Width); 
} 
this.Page.RegisterClientScriptBlock("show", @"<script> 
parent.VarValue='" + UpLoadPath + "/" + fileName_s + "';" + 
"parent." + ParentID + "CallLoaded();" + 
"parent.document.getElementById('" + ParentID + "_" + "dvImg" + @"').innerHTML=""" + 
"<img src='http://img.phperz.com/data/img/20160628/1467123878_3652.jpeg); 
} 
catch (System.Exception e) 
{ 
throw e; 
} 
finally 
{ 
originalImage.Dispose(); 
bitmap.Dispose(); 
g.Dispose(); 
} 
} 
/// <summary> 
/// 在图片上增加文字水印 
/// </summary> 
/// <param name="Path">原服务器图片路径</param> 
/// <param name="Path_sy">生成的带文字水印的图片路径</param> 
protected void AddShuiYinWord(string Path, string Path_sy) 
{ 
string addText = "http://www.phperz.com"; 
System.Drawing.Image image = System.Drawing.Image.FromFile(Path); 
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); 
g.DrawImage(image, 0, 0, image.Width, image.Height); 
System.Drawing.Font f = new System.Drawing.Font("Verdana", 16); 
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue); 
g.DrawString(addText, f, b, 15, 15); 
g.Dispose(); 
image.Save(Path_sy); 
image.Dispose(); 
} 
/// <summary> 
/// 在图片上生成图片水印 
/// </summary> 
/// <param name="Path">原服务器图片路径</param> 
/// <param name="Path_syp">生成的带图片水印的图片路径</param> 
/// <param name="Path_sypf">水印图片路径</param> 
protected void AddShuiYinPic(string Path, string Path_syp, string Path_sypf) 
{ 
System.Drawing.Image image = System.Drawing.Image.FromFile(Path); 
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf); 
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); 
g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel); 
g.Dispose(); 
image.Save(Path_syp); 
image.Dispose(); 
} 
}

属性:
SupportExtension 自定义上传的格式,用"|"分隔;
UpLoadPath 　　自定义上传到服务器的文件夹;
AutoFileName　　ture表示根据时间自动生成文件名,不会重复,false表示原来的图片名称,重复会覆盖.

转载请注明出处
2009-12-24 18:39:27 by 齐学佳



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