佔地方,晚上寫
不好意思,拖到今天了。。。。。。。。。
其實裏面寫的很亂,包括修改文件名什麼的都沒有仔細去寫,主要是想記錄下縮略圖生成的幾種方式 ,大家明白就好
void UpImgs()
{
if (FileUpload1.HasFile)
{
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName; // 客戶端文件路徑
FileInfo file = new FileInfo(name);
//string fileName = CreatFileName(file.Name)+"_"+file.Name; // 文件名稱
//string fileName_s = "s_" + CreatFileName(file.Name) + "_" + file.Name; // 縮略圖文件名稱
string fileName = CreatFileName(file.Name); // 文件名稱
string fileName_s = "s_" + CreatFileName(file.Name); // 縮略圖文件名稱
string webFilePath = Server.MapPath("../file/" + fileName); // 服務器端文件路徑
string webFilePath_s = Server.MapPath("../file/" + fileName_s); // 服務器端縮略圖路徑
string dbname = "~/file/" + fileName;//存放到數據庫裏的相對路徑
string dbnames = "~/file/" + fileName_s;//存放到數據庫裏的相對路徑
if (!File.Exists(webFilePath))
{
try
{
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
MakeThumbnail(webFilePath, webFilePath_s, 200, 160, "Cut"); // 生成縮略圖方法
//Label1.Text = "提示:文件“" + fileName + "”成功上傳,並生成“" + fileName_s + "”縮略圖,文件類型爲:" + FileUpload1.PostedFile.ContentType + ",文件大小爲:" + FileUpload1.PostedFile.ContentLength + "B";
Label1.Text = "提示:文件“" + dbname + "”成功上傳,並生成“" + dbnames + "”縮略圖,文件類型爲:" + FileUpload1.PostedFile.ContentType + ",文件大小爲:" + FileUpload1.PostedFile.ContentLength + "B";
File.Delete(webFilePath);//刪除源文件,在這我把源文件刪了,只保留了縮小後的圖片
}
catch (Exception ex)
{
Label1.Text = "提示:文件上傳失敗,失敗原因:" + ex.Message;
}
}
else
{
Label1.Text = "提示:文件已經存在,請重命名後上傳";
}
}
else
{
Label1.Text = "提示:文件類型不符";
}
}
}
/**////
/// 生成縮略圖
///
/// 源圖路徑(物理路徑)
/// 縮略圖路徑(物理路徑)
/// 縮略圖寬度
/// 縮略圖高度
/// 生成縮略圖的方式
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW"://指定高寬縮放(可能變形)
break;
case "W"://指定寬,高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高,寬按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高寬裁減(不變形)
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一個bmp圖片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一個畫板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//設置高質量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//設置高質量,低速度呈現平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空畫布並以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
//在指定位置並且按指定大小繪製原圖片的指定部分
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);
try
{
//以jpg格式保存縮略圖
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
string CreatFileName(string fileName)
{
DateTime now = DateTime.Now;
string str =
now.Year.ToString() +
now.Month.ToString() +
now.Day.ToString() +
now.Hour.ToString() +
now.Minute.ToString() +
now.Second.ToString() +
fileName;
return str;
}