.net 上传图片的2中方式
<script type="text/javascript">
var i=1
function addFile()
{
if (i<8)
{var str = '<BR> <input type="file" name="File" runat="server" style="width: 300px"/>描述：<input name="text" type="text" style="width: 150px" maxlength="20" />'
document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
}
else
{
alert("您一次最多只能上传8张图片！")
}
i++
}
function verCode()
{
alert("验证码输入错误");
}
</script>
<INPUT onclick="addFile()" 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[i];
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[i], 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 />
<asp:Label ID="Label1" runat="server"></asp:Label><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 />
<asp:TextBox ID="TextBox1" runat="server" Height="308px" TextMode="MultiLine" Width="584px"></asp:TextBox>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="开始抓取" /></div>
</form>
using System.Configuration;
4using System.Collections;
5using System.Web;
6using System.Web.Security;
7using System.Web.UI;
8using System.Web.UI.WebControls;
9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11using System.IO;
12using System.Net;
13using System.Text.RegularExpressions;
14
15namespace ImgUpload
16
{
17
/// <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
21
{
22 protected void Page_Load(object sender, EventArgs e)
23
{
24
25 }
26
27 protected void Button1_Click(object sender, EventArgs e)
28 {
29 if (FileUpload1.HasFile)
30 {
31 string fileContentType = FileUpload1.PostedFile.ContentType;
32 if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
33 {
34 string name = FileUpload1.PostedFile.FileName; // 客户端文件路径
35
36 FileInfo file = new FileInfo(name);
37 string fileName = file.Name; // 文件名称
38 string fileName_s = "x_" + file.Name; // 缩略图文件名称
39 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>
167 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[i]), 365, 400))
{
guangGao = "<img src='/Wholesale%20Member/background/jrxk/PiFaImg/" + GetPic(alist[i]) + "'></img><br>";
}
else
{
guangGao = "<img src='/Wholesale%20Member/background/jrxk/PiFaImg/" + GetPic(alist[i]) + "' witch=360 height=400></img><br>";
}
}
if (infotype == "特价商品")
{
if (ImgState.GetImgStateBySize("../background/tjsp/PiFaImg/", GetPic(alist[i]), 365, 400))
{
guangGao = "<img src='/Wholesale%20Member/background/tjsp/PiFaImg/" + GetPic(alist[i]) + "'></img><br>";
}
else
{
guangGao = "<img src='/Wholesale%20Member/background/tjsp/PiFaImg/" + GetPic(alist[i]) + "' 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;
}
}
