.net 上传图片的2中方式

来源：互联网发布：淘宝产品优化编辑：程序博客网时间：2024/04/29 03:03

The Frist Class .aspx 代码

<INPUT type="button" value="增加图片(Add)"><br />
<input id="File1" type="file" name="File" runat="server" style="width: 300px"/>
描述：<input name="text" type="text" style="width: 150px" maxlength="20" />
===========================================================
.cs 代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing;
using System.Data.SqlClient;
using System.Text;
protected void btnUpload_Click(object sender, EventArgs e)
{
if (Session["userid"] != null && Session["user"] != null && Session["model"] != null && Session["userid"].ToString() != "" && Session["user"].ToString() != "" && Session["model"].ToString() != "")         {             if (this.ddlAlbum.SelectedValue == "请选择产品的类别")             {                 Jsp.Alert("请选择类别");
}
else
{
if (this.txtVerifyCode.Text.Trim().ToUpper() != Session["VerifyCode"].ToString())
{
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "define", "<script>verCode()</script>");
//动态注册脚本
}
else
{
lblMessage.Text = "";
lblMessage.Visible = false;
System.Web.HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;
System.Text.StringBuilder strmsg = new System.Text.StringBuilder("");
string[] rd = Request.Form[1].Split(',');
//获得图片描述的文本框字符串数组，为对应的图片的描述
string albumid = ddlAlbum.SelectedValue.Trim();
int ifile;
for (ifile = 0; ifile < files.Count; ifile++)
{
if (files[ifile].FileName.Length > 0)
{
System.Web.HttpPostedFile postedfile = files[ifile];
string fex = Path.GetExtension(postedfile.FileName);
if (fex != ".jpg" && fex != ".JPG" && fex != ".gif" && fex != ".GIF")
{
strmsg.Append(Path.GetFileName(postedfile.FileName) + "---图片格式不对，只能是jpg或gif<br>");
int num2 = ifile + 1;
Jsp.Alert("您选择的第" + num2 + "张图片错误！图片格式不正确只能是jpg或gif");
imgState = false; break;
}
if (postedfile.ContentLength > 200 * 1024)//单个文件不能大于200k
{
strmsg.Append(Path.GetFileName(postedfile.FileName) + "---不能大于1024k<br>");
int num1 = ifile + 1;
Jsp.Alert("您选择的第" + num1 + "张图片错误！图片大小不能大于200K");
imgState = false; break;
}
System.Drawing.Image image = System.Drawing.Image.FromStream(files[ifile].InputStream);
int width = image.Width;
int height = image.Height;
int num = ifile + 1;
if (width > 300 || height > 500)
{
Jsp.Alert("您选择的第" + num + "张图片错误！您的图片是" + width + "*" + height + "！请您重新上传尺寸小于300*500的图片");
imgState = false; break;
}
}
}
if (strmsg.Length <= 0)//说明图片大小和格式都没问题
{
//以下为创建图库目录
//string dirname = "pic00" + ddlAlbum.SelectedValue.Trim();
string dirpath = Server.MapPath("..//..//dress_corp/ProIMG");
//dirpath = dirpath +"\\" + dirname;
if (Directory.Exists(dirpath) == false)
{
Directory.CreateDirectory(dirpath);
}
Random ro = new Random();
int name = 1;
if (imgState)
{
try
{
for (int i = 0; i < files.Count; i++)
{
System.Web.HttpPostedFile myFile = files;
string FileName = "";
string FileExtention = "";
string PicPath = "";
FileName = System.IO.Path.GetFileName(myFile.FileName);
string stro = ro.Next(100, 100000000).ToString() + name.ToString();//产生一个随机数用于新命名的图片
string NewName = DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + stro;
if (FileName.Length > 0)//有文件才执行上传操作再保存到数据库
{
FileExtention = System.IO.Path.GetExtension(myFile.FileName);
string ppath = dirpath + "\\" + NewName + FileExtention;
myFile.SaveAs(ppath);
string FJname = FileName;
PicPath = NewName + FileExtention;
}
AddPicture(PicPath, rd, albumid);//将图片信息保存到数据库
}
Jsp.GoBack("添加成功", "qy-fab-list.aspx");
}
catch

{
Jsp.Alert("添加失败");
}
}
}
else
{
lblMessage.Text = strmsg.ToString();
lblMessage.Visible = true;
}
}
}
}
else
{
Jsp.GoBack("连接超时，请重新登陆！", "/user/login.aspx");
}
}
public void AddPicture(string imgpath, string imgnote, string albumid)
{
StringBuilder strSql = new StringBuilder();
strSql.Append("insert into e_ProShowPhoto(");
strSql.Append("PhotoTitle,PhotoFileName,CateType,UserID)");
strSql.Append(" values (");
strSql.Append("@PhotoTitle,@PhotoFileName,@CateType,@UserID)");
SqlParameter[] parameters = {
new SqlParameter("@PhotoTitle", SqlDbType.VarChar,40),
new SqlParameter("@PhotoFileName", SqlDbType.VarChar,50),
new SqlParameter("@CateType", SqlDbType.VarChar,50),
new SqlParameter("@UserID", SqlDbType.Int,4)
};
parameters[0].Value = imgnote;
parameters[1].Value = imgpath;
parameters[2].Value = albumid;
parameters[3].Value = userID;
SqlHelper.ExecuteSql(strSql.ToString(), parameters);
}

==============================

<form id="form1" runat="server">
<div>
图片上传：生成缩略图加文字水印图片水印<br />
<br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传图片" />
<br />
<aspabel ID="Label1" runat="server"></aspabel><br />
<br />
远程图片抓取（保存到本地）支持jpg、gif、bmp、png<br />
图片抓取后自动以日期+原名称命名<br /> 输入远程图片地址（支持Html）<br />
<aspextBox ID="TextBox1" runat="server" Height="308px" TextMode="MultiLine" Width="584px">
</aspextBox>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="开始抓取" />
</div> </form>

using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;

namespace ImgUpload
...{
    /**//// <summary> 18
/// 上传图片生成缩略图及水印
/// 19
///
/// </summary> 20
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) 23
{       }
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
        string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName;
// 客户端文件路径
FileInfo file = new FileInfo(name);
string fileName = file.Name;
// 文件名称 38
string fileName_s = "x_" + file.Name;
// 缩略图文件名称
string fileName_sy = "text_" + file.Name;
// 水印图文件名称（文字） 40
string fileName_syp = "water_" + file.Name;
// 水印图文件名称（图片） 41
string webFilePath = Server.MapPath("ImgUpload/" + fileName);
// 服务器端文件路径 42
string webFilePath_s = Server.MapPath("ImgUpload/" + fileName_s);　　
// 服务器端缩略图路径 43
string webFilePath_sy = Server.MapPath("ImgUpload/" + fileName_sy);　
// 服务器端带水印图路径(文字) 44
string webFilePath_syp = Server.MapPath("ImgUpload/" + fileName_syp);　
// 服务器端带水印图路径(图片) 45
string webFilePath_sypf = Server.MapPath("aspx.png");
// 服务器端水印图路径(图片) 46 47
if (!File.Exists(webFilePath)) 48
...{
49
try
50
...{
51
FileUpload1.SaveAs(webFilePath);
// 使用 SaveAs 方法保存文件 52
AddWater(webFilePath, webFilePath_sy);
53
AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf);
54
MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut");
// 生成缩略图方法 55
Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B"; 56
} 57
catch (Exception ex)
58
...{ 59
Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message; 60
} 61
} 62
else 63
...{ 64
Label1.Text = "提示：文件已经存在，请重命名后上传"; 65
} 66
} 67
else 68
...{ 69
Label1.Text = "提示：文件类型不符"; 70
} 71
} 72
} 73
/**//**/ 74
/**//// <summary> 75
    /// /// 生成缩略图 76
    /// /// </summary> 77
    /// /// <param name="originalImagePath">源图路径（物理路径）</param> 78
    /// /// <param name="thumbnailPath">缩略图路径（物理路径）</param> 79
    /// /// <param name="width">缩略图宽度</param> 80
    /// /// <param name="height">缩略图高度</param> 81
    /// /// <param name="mode">生成缩略图的方式</param> 82
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode) 83
...{ 84
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
85 86
int towidth = width; 87
int toheight = height; 88 89
int x = 0; 90
int y = 0; 91
int ow = originalImage.Width; 92
int oh = originalImage.Height; 93 94
switch (mode) 95
...{ 96
case "HW"://指定高宽缩放（可能变形）
97 break; 98
case "W"://指定宽，高按比例
99
toheight = originalImage.Height * width / originalImage.Width; 100
break;
101
case "H"://指定高，宽按比例 102
towidth = originalImage.Width * height / originalImage.Height; 103
break; 104
case "Cut"://指定高宽裁减（不变形）
105
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
106
...{ 107
oh = originalImage.Height; 108
ow = originalImage.Height * towidth / toheight; 109
y = 0; 110
x = (originalImage.Width - ow) / 2; 111
} 112
else 113
...{ 114
ow = originalImage.Width; 115
oh = originalImage.Width * height / towidth; 116
x = 0; 117
y = (originalImage.Height - oh) / 2; 118
} 119
break; 120
default: 121
break; 122
} 123 124
//新建一个bmp图片 125
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight); 126 127
//新建一个画板 128
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); 129 130
//设置高质量插值法 131
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 132 133
//设置高质量,低速度呈现平滑程度 134
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 135 136
//清空画布并以透明背景色填充 137
g.Clear(System.Drawing.Color.Transparent); 138 139
//在指定位置并且按指定大小绘制原图片的指定部分 140
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight), 141
new System.Drawing.Rectangle(x, y, ow, oh), 142
System.Drawing.GraphicsUnit.Pixel); 143 144
try 145            ...{ 146
//以jpg格式保存缩略图 147
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); 148
} 149
catch (System.Exception e) 150
...{ 151                throw e; 152
} 153            finally 154
...{ 155                originalImage.Dispose(); 156
bitmap.Dispose(); 157                g.Dispose(); 158
} 159
} 160 161
/**//**/ 162        /**//// <summary> 163
/// /// 在图片上增加文字水印 164
/// </summary> 165
/// <param name="Path">原服务器图片路径</param> 166
/// <param name="Path_sy">生成的带文字水印的图片路径</param>

protected void AddWater(string Path, string Path_sy) 168
...{ 169
string addText = "vs2005.com"; 170
System.Drawing.Image image = System.Drawing.Image.FromFile(Path); 171
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); 172
g.DrawImage(image, 0, 0, image.Width, image.Height); 173
System.Drawing.Font f = new System.Drawing.Font("Verdana", 60); 174
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green); 175 176
g.DrawString(addText, f, b, 35, 35); 177
g.Dispose(); 178 179
image.Save(Path_sy); 180
image.Dispose(); 181
} 182 183
/**//**/ 184
/**//// <summary> 185
    /// /// 在图片上生成图片水印 186
    /// /// </summary> 187
    /// /// <param name="Path">原服务器图片路径</param> 188
    /// /// <param name="Path_syp">生成的带图片水印的图片路径</param> 189
    /// /// <param name="Path_sypf">水印图片路径</param> 190
    ///
protected void AddWaterPic(string Path, string Path_syp, string Path_sypf) 191
...{ 192
System.Drawing.Image image = System.Drawing.Image.FromFile(Path); 193
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf); 194
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); 195
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); 196            g.Dispose(); 197 198
image.Save(Path_syp); 199
image.Dispose(); 200
} 201 202
protected void Button2_Click(object sender, EventArgs e) 203
...{ 204
//自动保存远程图片 205
WebClient client = new WebClient(); 206
//备用Reg:
<img.*?src=([\"\'])(http:\/\/.+\.(jpg|gif|bmp|bnp))\1.*?> 207
Regex reg = new Regex("IMG[^>]*?src\\s*=\\s*(?:\"(?<1>[^\"]*)\"|'(?<1>[^\']*)')", RegexOptions.IgnoreCase); 208
MatchCollection m = reg.Matches(TextBox1.Text); 209 210
foreach (Match math in m) 211
...{ 212
string imgUrl = math.Groups[1].Value; 213 214
//在原图片名称前加YYMMDD重名名并上传 215 216
Regex regName = new Regex(@"\w+.(?:jpg|gif|bmp|png)", RegexOptions.IgnoreCase); 217 218
string strNewImgName = DateTime.Now.ToShortDateString().Replace("-", "") + regName.Match(imgUrl).ToString(); 219 220
try 221                    ...{ 222
//保存图片 223
client.DownloadFile(imgUrl, Server.MapPath("ImgUpload/Auto/" + strNewImgName)); 224 225
} 226
catch 227
...{ 228                    } 229
finally 230                    ...{ 231 232
} 233 234                client.Dispose(); 235
} 236 237
Response.Write("<script>alert('远程图片保存成功，保存路径为ImgUpload/auto')</script>"); 238 239
} 240
} 241}
============================================================= 前台显示时候
<img src="../Background/tjsp/PiFaImg/<%=IMG%>" width="85" height="85">　
//产品的图片
if (img != null && img != "")
{
alist1 = DataTransfer.SetMoreInfo(img, ',');
for (int i = 0; i < alist1.Length; i++)
{
bool booState = false;
if (infotype == "今日新款")
{
if (ImgState.GetImgStateBySize("../background/jrxk/PiFaImg/", GetPic(alist), 365, 400))
{
guangGao = "<img src='/Wholesale%20Member/background/jrxk/PiFaImg/" + GetPic(alist) + "'></img><br>";
}
else
{
guangGao = "<img src='/Wholesale%20Member/background/jrxk/PiFaImg/" + GetPic(alist) + "' witch=360 height=400></img><br>";
}
}
if (infotype == "特价商品")
{
if (ImgState.GetImgStateBySize("../background/tjsp/PiFaImg/", GetPic(alist), 365, 400))
{
guangGao = "<img src='/Wholesale%20Member/background/tjsp/PiFaImg/" + GetPic(alist) + "'></img><br>";
}
else
{
guangGao = "<img src='/Wholesale%20Member/background/tjsp/PiFaImg/" + GetPic(alist) + "' witch=360 height=400></img><br>";
}
}
}
}
else
{
if (infotype == "今日新款")
{
guangGao = "<img src='/Wholesale%20Member/background/jrxk/PiFaImg/no.gif'></img>";
}
if (infotype == "特价商品")
{
guangGao = "<img src='/Wholesale%20Member/background/tjsp/PiFaImg/no.gif'></img>";
}
}

=============
public static string[] SetMoreInfo(string str,char chr)
{
if (str == String.Empty || str == null)
return null;
else         {
string[] alist = str.Split(chr);
return alist;
}
} =

===========    /// <summary>
               /// /// 便利指定路径下的图片
               /// /// </summary>
               /// /// <param name="path">路径</param>
               /// /// <param name="picName">图片名</param>
               /// /// <returns>bool有的话true,没有的话就false</returns>
               ///

public static bool GetImgState(string path,string picName)
{
if (File.Exists(System.Web.HttpContext.Current.Server.MapPath(path + picName)))
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 判断图片是否存在并且判断是否在指定范围内
/// /// </summary>
/// /// <param name="path"></param>
/// /// <param name="picName"></param>
/// /// <param name="width"></param>
///
// <param name="height"></param>
/// <returns></returns>
///
public static bool GetImgStateBySize(string path, string picName, int width, int height)
{
if
(File.Exists(System.Web.HttpContext.Current.Server.MapPath(path + picName)))
{
System.Drawing.Image image = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(path + picName));
if (image.Width < width && image.Height < height)
{
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}