using System;
using System.Configuration;
using System.Data;
using System.Linq;
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.Xml.Linq;
using System.IO;
using System.Drawing;
using System.Collections;
using System.Drawing.Imaging;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
//// <summary>
/// 按比例缩小图片，自动计算宽度
/// </summary>
/// <param name="strOldPic">源图文件名(包括路径)</param>
/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
/// <param name="intHeight">缩小至高度</param>
public void SmallPicWidth(string strOldPic, string strNewPic, int intHeight)
{
Bitmap objPic, objNewPic;
try
{
objPic = new Bitmap(strOldPic);
int intWidth = (intHeight / objPic.Height) * objPic.Width;
objNewPic = new Bitmap(objPic, intWidth, intHeight);
objNewPic.Save(strNewPic);
}
catch (Exception exp) { throw exp; }
finally
{
objPic = null;
objNewPic = null;
}
}
/**/
/// <summary>
/// 缩小图片
/// </summary>
/// <param name="strOldPic">源图文件名(包括路径)</param>
/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
/// <param name="intWidth">缩小至宽度</param>
/// <param name="intHeight">缩小至高度</param>
public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight)
{
Bitmap objPic, objNewPic;
try
{
objPic = new Bitmap(strOldPic);
objNewPic = new Bitmap(objPic, intWidth, intHeight);
objNewPic.Save(strNewPic);
}
catch (Exception exp)
{ throw exp; }
finally
{
objPic = null;
objNewPic = null;
}
}
protected string NewImage()
{
string type = Path.GetExtension(this.FileUpload1.PostedFile.FileName).ToLower().Trim();
Random r = new Random();
string name = System.DateTime.Now.ToString("yyyyMMddhhmmssfff") + r.Next(0, 100) + type;
string serverpath = Server.MapPath("~/UpLoadImag/") + name;
this.FileUpload1.PostedFile.SaveAs(serverpath);
return serverpath;
}
/**//// <summary>
/// 图片上传，带上缩略图
/// </summary>
/// <param name="FileUpload1">上传的控件的ID</param>
/// <param name="SavePath">保存的路径，相对路径如“/Images/Picture/”,使用配置文件</param>
/// <param name="refName">返回的文件名，不带路径</param>
/// <param name="width">缩略图的宽</param>
/// <param name="height">缩略图的高</param>
/// <param name="maxLength">图片最大的大小</param>
/// <returns></returns>
public bool UpLoadImage(FileUpload FileUpload1, string SavePath, string refName, int width, int height, int maxLength)
{
//在转换的时候需求使用系统路径
SavePath = "~" + SavePath;
/**////成功状态
bool ret = true;
/**////上传文件名称组
string fileNames = string.Empty;
//上传文件总大小
int fileLength = 0;
//图片类型
string imgType = string.Empty;
//图片类型集合
ICollection ic = new string[] { ".gif", ".jpg", ".GIF", ".JPG" };
ArrayList imgTypes = new ArrayList(ic);
/**////判断上传文件的有效性
///检查文件扩展名字
string name = System.IO.Path.GetFileName(FileUpload1.FileName);
if (name == "")
{
/**////状态信息
ret = false;
refName = "图片不存在";
return false;
}
imgType = System.IO.Path.GetExtension(FileUpload1.FileName);
if (!imgTypes.Contains(imgType))
{
/**////状态信息
ret = false;
refName = "图片格式不对";
return false;
}
fileLength = fileLength + FileUpload1.PostedFile.ContentLength;
//系统规定大小
int sysLength = maxLength * 1024;
if (fileLength > sysLength)
{
/**////状态信息
ret = false;
refName = "图片超过200KB上限！";
return false;
}
/**////图片上传
try
{
string picPath = SavePath;
string fileName, fileExtension;
/**////上传文件的文件名
fileName = System.IO.Path.GetFileName(FileUpload1.FileName);
if (fileName != "")
{
/**////上传文件的扩展名
fileExtension = System.IO.Path.GetExtension(fileName);
/**////生成新的文件名
fileName = DateTime.Now.ToString("yyyyMMddHHmmffff") + fileExtension;
/**////可根据扩展名字的不同保存到不同的文件夹
string date = DateTime.Now.ToString("yyyyMM");
picPath = Server.MapPath(picPath + date + "/");
System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(picPath);
if (!di.Exists)
{
di.Create();
}
/**////注意：可能要修改您的文件夹的匿名写入权限。
FileUpload1.PostedFile.SaveAs(picPath + fileName);
refName = date + "/" + fileName;
GetThumbnailImage(SavePath , date + "/", fileName, width, height);
}
}
catch
{
ret = false;
refName = "上传失败！";
return false;
}
return ret;
}
//生成缩略图代码:
/**//// <param name="SavePath">原始路径</param>
/// <param name="pathDate">添加的月份路径</param>
/// <param name="picFilePath">保存的文件名</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
public void GetThumbnailImage(string SavePath, string pathDate,string picFilePath, int width, int height)
{
//添加small100的前缀大小
//程序内相对的服务器路径小图片
string strRelativeSmallPath = SavePath + pathDate;
string SmallPath100 = Server.MapPath(strRelativeSmallPath + picFilePath);
string machpath = Server.MapPath(SavePath + pathDate + picFilePath);
string isDir = SmallPath100.Substring(0, SmallPath100.LastIndexOf('/'));
System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(isDir);
if (!di.Exists)
{
di.Create();
}
Bitmap img = new Bitmap(machpath); //read picture to memory
int h = img.Height;
int w = img.Width;
int ss, os;// source side and objective side
double temp1, temp2;
//compute the picture's proportion
temp1 = (h * 1.0D) / height;
temp2 = (w * 1.0D) / width;
if (temp1 < temp2)
{
ss = w;
os = width;
}
else
{
ss = h;
os = height;
}
double per = (os * 1.0D) / ss;
if (per < 1.0D)
{
h = (int)(h * per);
w = (int)(w * per);
}
// create the thumbnail image
System.Drawing.Image imag2 =null;
//img.GetThumbnailImage(w, h,
// new System.Drawing.Image.GetThumbnailImageAbort(10, IntPtr.Zero));
Bitmap tempBitmap = new Bitmap(w, h);
System.Drawing.Image tempImg = System.Drawing.Image.FromHbitmap(tempBitmap.GetHbitmap());
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(tempImg);
g.Clear(Color.White);
int x, y;
x = (tempImg.Width - imag2.Width) / 2;
y = (tempImg.Height - imag2.Height) / 2;
g.DrawImage(imag2, x, y, imag2.Width, imag2.Height);
try
{
if (img != null)
img.Dispose();
if (imag2 != null)
imag2.Dispose();
if (tempBitmap != null)
tempBitmap.Dispose();
string fileExtension = System.IO.Path.GetExtension(machpath).ToLower();
//按原图片类型保存缩略图片,不按原格式图片会出现模糊,锯齿等问题.
switch (fileExtension)
{
case ".gif": tempImg.Save(SmallPath100, ImageFormat.Gif); break;
case ".jpg": tempImg.Save(SmallPath100, ImageFormat.Jpeg); break;
case ".bmp": tempImg.Save(SmallPath100, ImageFormat.Bmp); break;
case ".png": tempImg.Save(SmallPath100, ImageFormat.Png); break;
}
}
catch
{
throw new Exception("图片上传失败");
}
finally
{
//释放内存
if (tempImg != null)
tempImg.Dispose();
if (g != null)
g.Dispose();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string name1 = NewImage();
//string type = Path.GetExtension(this.FileUpload1.PostedFile.FileName).ToLower().Trim();
string name2 = Server.MapPath("~/UpLoadImage/")+"2.jpg";
//UpLoadImage(FileUpload1, "uploadimag", "", 300, 300, 3000);
SmallPic( name1,name2, 300, 300);
}
}