技术文章 > 图片上传的Codebehind(自动生成所略图)

图片上传的Codebehind(自动生成所略图)

2018-09-19 10:46

文档管理软件,文档管理系统,知识管理系统,档案管理系统的技术资料:


日期:2005-6-12 12:10:00 来源: 编辑: 18     [全屏查看全文]

using System;
using System.Collections;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;
using cj168.util;

namespace cj168.Web.Mag.Admins.FeData
{
/// <summary>
/// Summary description for fedata.
/// </summary>
public class feUploadPic : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox txtboxPicTitle;
protected System.Web.UI.WebControls.Calendar calPicDate;
protected System.Web.UI.WebControls.DropDownList ddlPicType;
protected System.Web.UI.WebControls.TextBox txtboxPicIntro;
protected System.Web.UI.HtmlControls.HtmlInputFile filePicName;
protected System.Web.UI.WebControls.Button btnSubmit;
protected System.Web.UI.WebControls.Label lblPicInfo;
protected System.Web.UI.WebControls.TextBox txtboxPicDate;
protected System.Web.UI.WebControls.RequiredFieldValidator Requiredfieldvalidator1;
protected System.Web.UI.WebControls.RegularExpressionValidator vldCatName;
protected System.Web.UI.WebControls.RequiredFieldValidator Requiredfieldvalidator2;
protected System.Web.UI.WebControls.CustomValidator CustomValidator1;
protected System.Web.UI.WebControls.RegularExpressionValidator RegularExpressionValidator1;
protected System.Web.UI.WebControls.HyperLink hlkOriPic;
protected System.Web.UI.WebControls.HyperLink hlkNewPic;
protected System.Web.UI.WebControls.RegularExpressionValidator Regularexpressionvalidator2;
protected System.Web.UI.WebControls.RegularExpressionValidator Regularexpressionvalidator3;
protected System.Web.UI.WebControls.CheckBoxList checkboxlistRewrite;



private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
//if(Page.IsPostBack)
//txtboxPicDate.Text = calPicDate.SelectedDate.ToString();
if(!Page.IsPostBack)
{
Bind2DropDownListPicType();
//for(int i = 0;i < Request.Files.Count; i++)
//{
// checkboxlistRewrite.Items[i].Selected = false;
//}
}



}
public void Bind2DropDownListPicType()
{
cj168.DataAccess.Admins admins = new cj168.DataAccess.Admins();
DataSet ds = admins.FePicTypeGet();
//ddlPicType.DataSource = ;
DataView dv = new DataView(ds.Tables[“PicType“]);

DataRowView drv = dv.AddNew();
//DataColumnView dcv = dv.AddNew();
drv[“Title“] = “请选择“;
drv[“fePicTypeID“] = “0“;
drv.EndEdit();

dv.Sort = “fePicTypeID“;
ddlPicType.DataSource = dv;
ddlPicType.DataBind();
}
public void UploadFile(object sender, System.EventArgs e)
{

string imgNameOnly, imgNameNoExt, imgExt;
string imgThumbnail;
int erroNumber = 0;
System.Drawing.Image oriImg, newImg;
string strFePicSavePath = ConfigurationSettings.AppSettings[“FePicSavePath“].ToString();
string strFePicThumbFormat = ConfigurationSettings.AppSettings[“FePicThumbFormat“].ToString().ToLower();
int intFeThumbWidth = Int32.Parse(ConfigurationSettings.AppSettings[“FePicThumbWidth“]);
string fileExt;
string strPicTitle = txtboxPicTitle.Text;
string strPicIntro = txtboxPicIntro.Text;
string strPicDate = txtboxPicDate.Text;
int intPicType = Int32.Parse(ddlPicType.SelectedItem.Value);
string strPicType = intPicType.ToString() + “_“ + DateTime.Now.Date.ToShortDateString() + “_“;
string strFePicWebPath = ConfigurationSettings.AppSettings[“FePicWebPath“];
cj168.DataAccess.Admins admins = new cj168.DataAccess.Admins();

//if(admins.FePicTypeSet(textboxTitle.Text,0) < 0)
// lblAddPicInfo.Text = “操作失败:已经存在相同名称类型,请修改“;
//else
// lblAddPicInfo.Text = “操作成功“;

StringBuilder picInfo = new StringBuilder();


if(Page.IsValid)
{

for(int i = 0;i < Request.Files.Count; i++)
{
HttpPostedFile PostedFile = Request.Files[i];
fileExt = (System.IO.Path.GetExtension(PostedFile.FileName)).ToString().ToLower();
//5-test.jpg
imgNameOnly = strPicType + System.IO.Path.GetFileName(PostedFile.FileName);
if(fileExt == “.jpg“ || fileExt == “.gif“ || fileExt == “.png“)
{
if(System.IO.File.Exists(strFePicSavePath + imgNameOnly) && (checkboxlistRewrite.Items[i].Selected == false))
{
erroNumber = erroNumber + 1;
picInfo.Append(“<b>错误:</b>文件(“+ (i+1) +“) “ + imgNameOnly + “ 已经存在,请修改文件名<br>“ );
}
}
else
{
erroNumber = erroNumber + 1;
if(fileExt == ““)
picInfo.Append(“<b>错误:</b>请选择文件<br>“ );
else
picInfo.Append(“<b>错误:</b>文件(“+ (i+1) +“) “ + imgNameOnly + “ 扩展名 “ + fileExt + “ 不被许可<br>“ );
}
}
if(erroNumber > 0)
{
picInfo.Append(“<font color=red>全部操作均未完成,请修改错误,再进行操作</font><br>“);
hlkOriPic.ImageUrl = ““;
hlkOriPic.ToolTip = ““;
hlkNewPic.ImageUrl = ““;
hlkNewPic.ToolTip = ““;
}
else
{
for(int i = 0;i < Request.Files.Count; i++)
{

HttpPostedFile PostedFile = Request.Files[i];
imgNameOnly = strPicType + System.IO.Path.GetFileName(PostedFile.FileName);
imgNameNoExt = System.IO.Path.GetFileNameWithoutExtension(PostedFile.FileName);
imgExt = System.IO.Path.GetExtension(PostedFile.FileName).ToString().ToLower();


oriImg = System.Drawing.Image.FromStream(PostedFile.InputStream);
newImg = oriImg.GetThumbnailImage(intFeThumbWidth, intFeThumbWidth * oriImg.Height/oriImg.Width,null,new System.IntPtr(0));
switch(imgExt)
{
//case “.jpeg“:
case “.jpg“:
oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case “.gif“:
oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Gif);
break;
case “.png“:
oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Png);
break;
}

//oriImg.Save(ConfigurationSettings.AppSettings[“FePicSavePath“] + imgNameNoExt + “.jpg“, System.Drawing.Imaging.ImageFormat.Jpeg);


switch(strFePicThumbFormat)
{
//jpeg format can get the smallest file size, and the png is the largest size
//case “jpeg“:
case “jpg“:
newImg.Save(strFePicSavePath + imgNameOnly + “_thumb.jpg“,System.Drawing.Imaging.ImageFormat.Jpeg);
imgThumbnail = imgNameOnly + “_thumb.jpg“;
break;
case “gif“:
newImg.Save(strFePicSavePath + imgNameOnly + “_thumb.gif“,System.Drawing.Imaging.ImageFormat.Gif);
imgThumbnail = imgNameOnly + “_thumb.gif“;
break;
case “png“:
newImg.Save(strFePicSavePath + imgNameOnly + “_thumb.png“,System.Drawing.Imaging.ImageFormat.Png);
imgThumbnail = imgNameOnly + “_thumb.png“;
break;
default:
newImg.Save(strFePicSavePath + imgNameOnly + “_thumb.jpg“,System.Drawing.Imaging.ImageFormat.Jpeg);
imgThumbnail = imgNameOnly + “_thumb.jpg“;
break;

}//switch

picInfo.Append(“<b>文件 名:</b>“ + imgNameOnly + “ ( “ + oriImg.Width + “ x “ + oriImg.Height + “ ) “ + PostedFile.ContentLength/1024 + “KB<br>“);
picInfo.Append(“<b>缩略图名:</b>“ + imgThumbnail + “ ( “ + newImg.Width + “ x “ + newImg.Height + “ )<br><br>“);
hlkOriPic.ImageUrl = strFePicWebPath + imgNameOnly;
hlkOriPic.ToolTip = “◆原图◆\n文件名:“ + imgNameOnly + “\n尺寸:“ + oriImg.Width + “ x “ + oriImg.Height + “\n字节:“ + PostedFile.ContentLength/1024 + “KB“;
hlkNewPic.ImageUrl = strFePicWebPath + imgThumbnail;
hlkNewPic.ToolTip = “◆缩略图◆\n文件名:“ + imgThumbnail + “\n尺寸:“ + newImg.Width + “ x “ + newImg.Height;

oriImg.Dispose();
newImg.Dispose();
picInfo.Append(“<font color=red>图片上传成功</font><br>“);
if(admins.FePicDataSet(strPicTitle, strPicDate, imgNameOnly, intPicType, strPicIntro, imgThumbnail,0) < 0)
picInfo.Append(“<font color=red>保存信息到数据库失败</font><br>“);
else
picInfo.Append(“<font color=red>保存信息到数据库成功</font><br>“);

}//for
picInfo.Append(“<font color=red>所有操作成功</font><br>“);
}// if erronumber = 0


}
else
{
picInfo.Append(“<font color=red>有错误,请检查。操作未成功</font><br>“);
hlkOriPic.ImageUrl = ““;
hlkOriPic.ToolTip = ““;
hlkNewPic.ImageUrl = ““;
hlkNewPic.ToolTip = ““;
}
for(int i = 0;i < Request.Files.Count; i++)
{
checkboxlistRewrite.Items[i].Selected = false;
}
lblPicInfo.Text = picInfo.ToString();
}
public void CalDateSelected(object sender,System.EventArgs e)
{
txtboxPicDate.Text = calPicDate.SelectedDate.ToShortDateString();
}
public void ServerValidateCheckDate(object sender, System.Web.UI.WebControls.ServerValidateEventArgs value)
{
cj168.util.iUtil iUtils = new cj168.util.iUtil();
if(!iUtils.IsDate(value.Value))
value.IsValid = false;
else
value.IsValid = true;
}


#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}

<%@ Page language=“c#“ Codebehind=“feUploadPic.aspx.cs“ AutoEventWireup=“false“ Inherits=“cj168.Web.Mag.Admins.FeData.feUploadPic“ %>
<%@ Register TagPrefix=“cj168“ TagName=“Header“ Src=“modules/headerFe.ascx“ %>
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN“ >
<HTML>
<HEAD>
<title>fedata</title>
<meta content=“Microsoft Visual Studio 7.0“ name=“GENERATOR“>
<meta content=“C#“ name=“CODE_LANGUAGE“>
<meta content=“JavaScript“ name=“vs_defaultClientScript“>
<meta content=“http://schemas.microsoft.com/intellisense/ie5“ name=“vs_targetSchema“>
<style>BODY { FONT-SIZE: 9pt }
.calPicDate { FONT-SIZE: 9pt; FONT-FAMILY: Verdana, Helvetica, sans-serif }
.valid { FONT-SIZE: 9pt; COLOR: red }
TD { FONT-SIZE: 9pt }
</style>
</HEAD>
<body MS_POSITIONING=“GridLayout“>
<table width=“100%“>
<tr>
<td><cj168:header id=“Header1“ runat=“server“></cj168:header></td>
</tr>
</table>
<form id=“fedata“ method=“post“ encType=“multipart/form-data“ runat=“server“>
<TABLE id=“Table1“ cellSpacing=“0“ cellPadding=“1“ width=“750“ border=“1“>
<TR>
<TD width=“70“>图片标题</TD>
<TD><asp:textbox id=“txtboxPicTitle“ runat=“server“></asp:textbox><br>
<asp:requiredfieldvalidator id=“Requiredfieldvalidator1“ runat=“server“ ErrorMessage=“请填写图片标题。“ CssClass=“valid“ ControlToValidate=“txtboxPicTitle“></asp:requiredfieldvalidator><br>
<asp:regularexpressionvalidator id=“vldCatName“ ErrorMessage=“图片标题至少2个字符,不应包含““ ” ! @ # $ % ^ & * ( ) < > 《 》{ } [ ] ? 。,? ¥“ CssClass=“valid“ ControlToValidate=“txtboxPicTitle“ ValidationExpression=“[^“^“^”^\^!^@^#^$^%^\^^&^*^(^)^<^>^《^》^?^。^,^?^¥^\{^\}^\][^\]]{2,}“ Runat=“server“></asp:regularexpressionvalidator></TD>
</TR>
<TR>
<TD>图片日期</TD>
<TD><asp:textbox id=“txtboxPicDate“ runat=“server“ Width=“300“></asp:textbox><asp:calendar id=“calPicDate“ runat=“server“ CssClass=“calPicDate“ Width=“300“ SelectMonthText=“本月“ SelectWeekText=“本周“ NextPrevFormat=“FullMonth“ OnSelectionChanged=“CalDateSelected“>
<NextPrevStyle CssClass=“calPicDate“></NextPrevStyle>
<WeekendDayStyle ForeColor=“red“></WeekendDayStyle>
<TodayDayStyle Font-Bold=“True“ ForeColor=“red“ BackColor=“#ccccff“></TodayDayStyle>
<SelectedDayStyle BackColor=“black“ Font-Bold=“true“></SelectedDayStyle>
</asp:calendar><BR>
<asp:requiredfieldvalidator id=“Requiredfieldvalidator2“ runat=“server“ ErrorMessage=“请选择或填写图片日期。“ CssClass=“valid“ ControlToValidate=“txtboxPicDate“></asp:requiredfieldvalidator><br>
<asp:customvalidator id=“CustomValidator1“ ErrorMessage=“不是个有效的日期格式“ CssClass=“valid“ ControlToValidate=“txtboxPicDate“ Runat=“server“ OnServerValidate=“ServerValidateCheckDate“></asp:customvalidator></TD>
</TR>
<TR>
<TD>图片分类</TD>
<TD><asp:dropdownlist id=“ddlPicType“ runat=“server“ DataValueField=“fePicTypeID“ DataTextField=“Title“></asp:dropdownlist><FONT face=“宋体“> </FONT><asp:regularexpressionvalidator id=“RegularExpressionValidator1“ ErrorMessage=“请选择图片分类“ CssClass=“valid“ ControlToValidate=“ddlPicType“ ValidationExpression=“[^0]{1,}“ Runat=“server“></asp:regularexpressionvalidator></TD>
</TR>
<TR>
<TD>图片介绍</TD>
<TD><asp:textbox id=“txtboxPicIntro“ runat=“server“ MaxLength=“255“ TextMode=“MultiLine“ Columns=“50“ Rows=“5“></asp:textbox>
<asp:RegularExpressionValidator id=“Regularexpressionvalidator2“ Runat=“server“ CssClass=“valid“ ErrorMessage=“内容中不应包含 “ < >“ ControlToValidate=“txtboxPicIntro“ ValidationExpression=“[^“^<^>]{0,}“></asp:RegularExpressionValidator>
</TD>
</TR>
<tr>
<td colSpan=“2“>(支持文件格式:Jpg, Gif, Png)</td>
</tr>
</TABLE>
<table cellSpacing=“0“ width=“750“ border=“1“>
<tr>
<td width=“70“>图片名称</td>
<td width=“300“><INPUT title=“浏览“ type=“file“ size=“25“ name=“filePicName“ runat=“server“ ID=“filePicName“>
<asp:RegularExpressionValidator id=“Regularexpressionvalidator3“ Runat=“server“ CssClass=“valid“ ErrorMessage=“文件名只能由字母或数字组成,不能包含 - _ 等其他符号长度至少为1“ ControlToValidate=“filePicName“ ValidationExpression=“[ :.\\a-zA-Z0-9]{1,}“></asp:RegularExpressionValidator>
</td>
<td><asp:checkboxlist id=“checkboxlistRewrite“ runat=“server“ BorderWidth=“0“ Height=“100%“ CellPadding=“5“ RepeatLayout=“Table“ RepeatColumns=“1“ RepeatDirection=“Vertical“>
<asp:ListItem Value=“1“>覆盖原有图片</asp:ListItem>
</asp:checkboxlist></td>
</tr>
</table>
<table cellSpacing=“0“ width=“750“ border=“1“>
<TR>
<TD align=“middle“><asp:button id=“btnSubmit“ onclick=“UploadFile“ runat=“server“ Text=“确定“></asp:button></TD>
</TR>
<TR>
<TD><asp:label id=“lblPicInfo“ runat=“server“>Label</asp:label></TD>
</TR>
<TR>
<TD><FONT face=“宋体“></FONT>
</TD>
</TR>
</table>
</form>
<asp:HyperLink id=“hlkOriPic“ runat=“server“>原图</asp:HyperLink>
<asp:HyperLink id=“hlkNewPic“ runat=“server“>缩略图</asp:HyperLink>
</body>
</HTML>
public int FePicDataSet(string strPicTitle, string strPicDate, string strPicName, int intPicType, string strPicIntro, string strThumbnail, int opID)
{
//string strPicTitle,
//string strPicDate,
//string strPicName,
//int intPicType,
//string strPicIntro,
//string strPicName,
//string strThumbnail,
//int opID
SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings[“ConnectionString“]);
SqlCommand myCommand = new SqlCommand(“mag_FePicDataSet“, myConnection);
// Mark the Command as a SPROC
myCommand.CommandType = CommandType.StoredProcedure;
// Add Parameters to SPROC
SqlParameter parameterUserId = new SqlParameter(“@opID“, SqlDbType.Int);
parameterUserId.Value = opID;
myCommand.Parameters.Add(parameterUserId);

SqlParameter parameterPicTitle = new SqlParameter(“@picTitle“, SqlDbType.Char, 30);
parameterPicTitle.Value = strPicTitle;
myCommand.Parameters.Add(parameterPicTitle);
SqlParameter parameterPicDate = new SqlParameter(“@picDate“, SqlDbType.Char, 10);
parameterPicDate.Value = strPicDate;
myCommand.Parameters.Add(parameterPicDate);
SqlParameter parameterPicName = new SqlParameter(“@picName“, SqlDbType.Char, 50);
parameterPicName.Value = strPicName;
myCommand.Parameters.Add(parameterPicName);
SqlParameter parameterPicType = new SqlParameter(“@picType“, SqlDbType.Int);
parameterPicType.Value = intPicType;
myCommand.Parameters.Add(parameterPicType);
SqlParameter parameterPicIntro = new SqlParameter(“@picIntro“, SqlDbType.Char, 255);
parameterPicIntro.Value = strPicIntro;
myCommand.Parameters.Add(parameterPicIntro);

SqlParameter parameterThumbnail = new SqlParameter(“@thumbnail“, SqlDbType.Char, 50);
parameterThumbnail.Value = strThumbnail;
myCommand.Parameters.Add(parameterThumbnail);
SqlParameter parameterHostAddress = new SqlParameter(“@opIP“, SqlDbType.Char, 15);
parameterHostAddress.Value = Context.Request.UserHostAddress;
myCommand.Parameters.Add(parameterHostAddress);
//SqlParameter parameterRID = new SqlParameter(“@returnID“, SqlDbType.Int);
//parameterReturnUserID.Value = -1;
//parameterRID.Direction = ParameterDirection.Output;
//myCommand.Parameters.Add(parameterRID);


// Execute the command in a try/catch to catch duplicate username errors
try
{
// Open the connection and execute the Command
myConnection.Open();
myCommand.ExecuteNonQuery();
}
catch
{
// failed to create a new user
return -1;
}
finally
{
// Close the Connection
if (myConnection.State == ConnectionState.Open)
myConnection.Close();
}
return 1;
}
图片上传的功能简介及web.config设置(自动生成所略图)

日期:2005-6-12 12:10:00 来源: 编辑: 19     [全屏查看全文]

功能:
1。把图片文件(JPG GIF PNG)上传,
2。保存到指定的路径(在web.config中设置路径,以文件的原有格式保存),
3。并自动生成指定宽度的(在web.config中设置宽度)
4。和指定格式的(在web.config中指定缩略图的格式,支持GIF,JPG,PNG)
5。和原图比例相同的缩略图(根据宽度和原图的宽和高计算所略图的高度)
6。可以判断是否已经存在文件
7。如果不覆盖,则给出错误
8。如果选中“覆盖原图“checkbox,则覆盖原图。
9。可以根据要求,在webform上设置1个以上的file input和相应的checkbox
10。并在文件上传完毕后,显示原图的文件名,尺寸,字节,和
11。缩略图的文件名尺寸,以及
12。显示原图和缩略图。
13。缩略图的文件名格式,以便与管理:
大图(原图): 图片分类代号_图片代表的日期_图片原有文件名.原有格式 (如:28_2002-1-28_test.jpg)
缩略图: 图片分类代号_图片代表的日期_图片原有文件名.原有格式_thumb.指定的缩略图格式 (如:28_2002-1-28_test.jpg_thumb.gif)
----------------------
web.config文件中的相应设置:
<?xml version=“1.0“ encoding=“utf-8“ ?>
<configuration>
<system.web>
...
...
</system.web>
<appSettings>
...
...
...
...
//FePicSavePath 图片保存在服务器上的实际路径
<add key=“FePicSavePath“ value=“d:/myroot/myapp/content/fepics/“ />
//FePicWebPath 图片的网络路径,用于显示图片
<add key=“FePicWebPath“ value=“http://www.mysite.com/fepics/“ />
//FePicThumbWidth 缩略图的宽度
<add key=“FePicThumbWidth“ value=“115“ />
//所略图的格式
<add key=“FePicThumbFormat“ value=“gif“ />
</appSettings>
</configuration>