.net 操作图片类
public class ImgHelp
{
//public static string gif = "image/gif";
//public static string jpg = "image/pjpeg";
//public static string png = "image/x-png";
Page pag = new Page();
string[] Imgtype = { "image/gif", "image/pjpeg", "image/x-png" };
public static string thisYear = DateTime.Now.Year.ToString();
public static string thisMonth = DateTime.Now.Month.ToString();
public static string thisDay = DateTime.Now.Day.ToString();
string strDate = thisYear + thisMonth + thisDay + DateTime.Now.Hour.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Millisecond.ToString();
/// <summary>
/// 保存上传的文件返回true为保存成功Massage为文件路径,返回false为保存失败Massage错误信息
/// </summary>
/// <param name="ProducFile"></param>
/// <param name="size">允许上传的最大值(以字节为单位)</param>
/// <param name="addurl">存储路径</param>
/// <param name="Massage">存储信息</param>
/// <returns></returns>
public bool UpImg(FileUpload ProducFile, int size, string addurl, out string Massage)
{
string mag;
bool su = false;
int i = ThrowImg(ProducFile, size, out mag);
if (i == 1)
{
//新文件名
string NewFileName = strDate + ProducFile.FileName.Replace("~", "").Replace("|", "").Replace("&", "");
string url = addurl;
string PddUrl = pag.Server.MapPath(url);
try
{
if (!Directory.Exists(PddUrl))
{
Directory.CreateDirectory(PddUrl);
}
if (File.Exists(pag.Server.MapPath(url + NewFileName)) == false)
{
ProducFile.SaveAs(pag.Server.MapPath(url + NewFileName));
Massage = url + NewFileName;
su = true;
}
else
{
Massage = "上传文件名已经存在,请重新上传!";
}
}
catch
{
Massage = "文件上传时程序出现异常,请重新上传!";
}
}
else
{
Massage = mag;
}
return su;
}
/// <summary>
/// 上传图片关生成 缩略图
/// </summary>
/// <param name="ProducFile">控件</param>
/// <param name="size">允许上传的最大值(以字节为单位)</param>
/// <param name="addurl">存储路径</param>
/// <param name="frontName">保存文件前缀名集合</param>
/// <param name="ImgWid">,宽度集合</param>
/// <param name="ImgHid">高度集合</param>
/// <param name="Massage">返回上传信息</param>
/// <returns></returns>
public bool UpImgAndBreviary(FileUpload ProducFile, int size, string addurl,string[] frontName,int[] ImgWid,int[] ImgHid,out string Massage)
{
string mag;
bool key = false;
int i = ThrowImg(ProducFile, size, out mag);
if (i != 1)
{
Massage = mag;
key = false;
}
else if (frontName.Length <= 0 || frontName.Length != ImgWid.Length || frontName.Length != ImgHid.Length)
{
Massage = "缩略图信息不相符";
key = false;
}
else
{
//新文件名
string NewFileName = "primary_" + strDate + ProducFile.FileName.Replace("primary_", "");
//存储路径
string url = addurl + thisYear + "/" + thisMonth + "/" + thisDay;
//转为服务器的绝对路径
string PddUrl = pag.Server.MapPath(url);
try
{
//判断路径目录是否存在
if (!Directory.Exists(PddUrl))
{
//创建目录
Directory.CreateDirectory(PddUrl);
if (File.Exists(pag.Server.MapPath(url + "/" + NewFileName)) == false)
{
//保存文件
ProducFile.SaveAs(pag.Server.MapPath(url + "/" + NewFileName));
//返回文件地址
Massage = url + "/" + NewFileName;
//生成缩略图
for (int j = 0; j < frontName.Length; j++)
{
BreviaryImg(Massage, Massage.Replace("primary_", frontName[j]), ImgWid[j], ImgHid[j]);
}
key = true;
//生成两张缩略图,保存名是在原图名前加了一个middle_,small_。
//newwidth1 = 200;
//newheight1 = 200;
//newwidth2 = 60;
//newheight2 = 60;
//BreviaryImg(Massage, Massage.Replace("primary_", "middle_"), newwidth1, newheight1);
//BreviaryImg(Massage, Massage.Replace("primary_", "small_"), newwidth2, newheight2);
}
else
{
Massage = "上传文件重名,请重新上传!";
key = false;
}
}
else
{
if (File.Exists(pag.Server.MapPath(url + "/" + NewFileName)) == false)
{
//保存文件
ProducFile.SaveAs(pag.Server.MapPath(url + "/" + NewFileName));
//返回保存地址
Massage = url + "/" + NewFileName;
//生成缩略图。
for (int j = 0; j < frontName.Length; j++)
{
BreviaryImg(Massage, Massage.Replace("primary_", frontName[j]), ImgWid[j], ImgHid[j]);
}
key = true;
}
else
{
Massage = "上传文件名已经存在,请重新上传!";
key = false;
}
}
}
catch
{
Massage = "文件上传时出现程序错误,请重新上传!";
key = false;
}
}
return key;
}
/// <summary>
/// 检测上传文件
/// </summary>
/// <param name="ProducFile"></param>
/// <param name="Size">允许上传最大值</param>
/// <param name="Massage">检测信息</param>
/// <returns></returns>
private int ThrowImg(FileUpload ProducFile, int Size, out string Massage)
{
int i = 0;
Boolean ImgOK = false;
if (ProducFile.HasFile)
{
//图片类型集
string[] ImgExtension = { ".gif", ".jpg", ".jpeg", ".png" };
//文件类型
string FileType = ProducFile.PostedFile.ContentType;
//文件扩展名
string FileExType = Path.GetExtension(ProducFile.FileName).ToLower();
//匹配类型
for (int k = 0; k < ImgExtension.Length; k++)
{
if (FileExType == ImgExtension[k])
{
foreach (string type in Imgtype)
{
if (FileType == type)
{
ImgOK = true;
break;
}
}
}
}
if (ImgOK == true)
{
//获取文件大小
int FileSize = ProducFile.PostedFile.ContentLength;
if (FileSize < Size)
{
i = 1;
Massage = "";
}
else
{
Massage = "上传文件过大!";
i = 0;
}
}
else
{
Massage = "上传的文件的格式不合法!";
i = 0;
}
}
else
{
Massage = "请选择正确的文件路径!";
i = 0;
}
return i;
}
/// <summary>
/// 生成缩缩略图
/// </summary>
/// <param name="imagePath">原图路径</param>
/// <param name="savePath">缩略图存储路径</param>
/// <param name="wid">缩略图宽</param>
/// <param name="hid">缩略图高</param>
private void BreviaryImg(string imagePath, string savePath, int wid, int hid)
{
string originalImagePath = pag.Server.MapPath(imagePath);
string thumbnailPath = pag.Server.MapPath(savePath);
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
//int towidth = wid;
//int toheight = hid;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(wid, hid);
//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, wid, hid), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);
try
{
//以原格式保存缩略图
bitmap.Save(thumbnailPath, originalImage.RawFormat);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
}
