//根据文件扩展名设置要上传到哪个目录
private static string SetDefaultDir(string strFileExt, ModelUploadFileConfig objConfig)
{
string strReturn = "";
switch (strFileExt)
{
case "gif":
case "jpg":
case "jpeg":
case "bmp":
case "png":
case "tiff":
case "wmf":
case "ico":
strReturn = objConfig.UploadFileRootDir + "/image/";
break;
case "swf":
strReturn = objConfig.UploadFileRootDir + "/flash/";
break;
case "xls":
case "xlsx":
strReturn = objConfig.UploadFileRootDir + "/excel/";
break;
case "txt":
case "doc":
case "docx":
case "chm":
case "pdf":
strReturn = objConfig.UploadFileRootDir + "/document/";
break;
case "zip":
case "rar":
strReturn = objConfig.UploadFileRootDir + "/zip/";
break;
case "avi":
case "mp3":
case "mp4":
case "wma":
case "wav":
case "flv":
strReturn = objConfig.UploadFileRootDir + "/media/";
break;
default:
strReturn = objConfig.UploadFileRootDir + "/document/";
break;
}
return(strReturn);
}
//检查上传的图像文件扩展名
private static bool CheckImageFileExt(string strFileExt, ModelUploadFileConfig objConfig)
{
string[] aryAllowFileExt = objConfig.AllowUploadImageFileExt.Split(',');
for (int i = 0; i <= aryAllowFileExt.Length - 1; i++)
{
if (strFileExt == aryAllowFileExt[i])
{
return(true);
}
}
return(false);
}
//绘制文本水印
private static void DrawTxtWaterMark(ModelUploadFileConfig objConfig)
{
if (!File.Exists(objConfig.ServerFileFullPath))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "文件不存在，加水印失败。";
return;
}
Image objImg = Image.FromFile(objConfig.ServerFileFullPath);
switch (objImg.PixelFormat)
{
case PixelFormat.Format1bppIndexed:
case PixelFormat.Format4bppIndexed:
case PixelFormat.Format8bppIndexed:
case PixelFormat.Undefined:
case PixelFormat.Format16bppArgb1555:
case PixelFormat.Format16bppGrayScale:
objConfig.OPFlag = false;
objConfig.OPMessage = "上传的图片包含不正确的像素格式，不能加水印！";
objImg.Dispose();
return;
default:
break;
}
Graphics g = null;
Font f = new Font("Verdana", 12f, FontStyle.Bold);
Brush b = new SolidBrush(Color.Red);
try
{
g = Graphics.FromImage(objImg);
g.DrawImage(objImg, 0, 0, objImg.Width, objImg.Height);
g.DrawString(objConfig.WaterMarkTxtString, f, b, Convert.ToSingle(objConfig.WaterMarkMarginRight), Convert.ToSingle(objConfig.WaterMarkMarginBottom));
objConfig.ServerFileHasWMFullPath = RenameFile(objConfig.ServerFileFullPath);
objImg.Save(objConfig.ServerFileHasWMFullPath);
objConfig.OPFlag = true;
}
catch (Exception ex)
{
throw ex;
}
finally
{
f.Dispose();
b.Dispose();
g.Dispose();
objImg.Dispose();
HelperFile.DeleteFile(objConfig.ServerFileHasWMFullPath);
}
}
//设置上传文件的大小限制
private static int SetDefaultSize(string strFileExt, ModelUploadFileConfig objConfig)
{
int intReturn = 0;
switch (strFileExt)
{
case "gif":
case "jpg":
case "jpeg":
case "bmp":
case "png":
case "tiff":
case "wmf":
case "ico":
intReturn = objConfig.AllowUploadImageFileSize;
break;
case "swf":
intReturn = objConfig.AllowUploadSwfFileSize;
break;
case "txt":
case "doc":
case "docx":
case "xls":
case "xlsx":
case "chm":
case "pdf":
intReturn = objConfig.AllowUploadTxtFileSize;
break;
case "zip":
case "rar":
intReturn = objConfig.AllowUploadZipFileSize;
break;
case "avi":
case "flv":
case "mp3":
case "mp4":
case "wma":
case "wav":
intReturn = objConfig.AllowUploadMediaFileSize;
break;
default:
intReturn = 10;
break;
}
return(intReturn);
}
//生成缩略图
private static ModelUploadFileConfig SetThumbImage(ModelUploadFileConfig objConfig)
{
if (!File.Exists(objConfig.ServerFileFullPath))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "文件不存在，生成缩略图失败。";
return(objConfig);
}
Image.GetThumbnailImageAbort objCallb = null;
Image objImg = null;
Image objImgThumb = null;
try
{
objImg = Image.FromFile(objConfig.ServerFileFullPath);
objImgThumb = objImg.GetThumbnailImage(objConfig.ThumbImageWidth, objConfig.ThumbImageHeight, objCallb, new IntPtr());
string strFileExt = objConfig.ServerFileFullPath.Substring(objConfig.ServerFileFullPath.LastIndexOf(".") + 1);
string strFileName = objConfig.ServerFileFullPath.Substring(0, objConfig.ServerFileFullPath.LastIndexOf("."));
objConfig.Thumb1FilePath = strFileName + "tn." + strFileExt;
objImgThumb.Save(objConfig.Thumb1FilePath);
objConfig.OPFlag = true;
objConfig.OPMessage = "生成缩略图成功！";
return(objConfig);
}
catch (Exception ex)
{
objConfig.OPFlag = false;
objConfig.OPMessage = ex.Message;
return(objConfig);
}
finally
{
objImg.Dispose();
objImgThumb.Dispose();
}
}
private void UploadFile(HttpContext context)
{
// HttpPostedFile objHPF = context.Request.Files[0];
HttpPostedFile objHPF = context.Request.Files["photo_file"];
if (objHPF == null)
{
context.Response.Write(HelperUtility.setReturnJson("500", "要上传的文件为空！", ""));
return;
}
ModelUploadFileConfig objConfig = new ModelUploadFileConfig();
objConfig.AllowUploadFileExt = "jpg,jpeg,png";
objConfig.AllowUploadImageFileExt = "jpg,jpeg,png";
HelperUploadFile.SaveULFileFromHPF(objHPF, objConfig);
if (objConfig.OPFlag)
{
context.Response.Write(HelperUtility.setReturnJson("200", "", objConfig.ServerFilePath));
}
else
{
context.Response.Write(HelperUtility.setReturnJson("500", objConfig.OPMessage, ""));
}
}
//绘制图片水印
private static void DrawPicWaterMark(ModelUploadFileConfig objConfig)
{
if (!File.Exists(objConfig.ServerFileFullPath))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "图片文件不存在，加水印失败。";
return;
}
string strRootPath = System.Web.HttpContext.Current.Request.PhysicalApplicationPath;
objConfig.WaterMarkImagePath = strRootPath + objConfig.WaterMarkImagePath;
if (!File.Exists(objConfig.WaterMarkImagePath))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "水印图片文件不存在，加水印失败。";
return;
}
//将服务器端要加水印的图像文件载入到Image对象里
Image objImg = Image.FromFile(objConfig.ServerFileFullPath);
switch (objImg.PixelFormat)
{
case PixelFormat.Format1bppIndexed:
case PixelFormat.Format4bppIndexed:
case PixelFormat.Format8bppIndexed:
case PixelFormat.Undefined:
case PixelFormat.Format16bppArgb1555:
case PixelFormat.Format16bppGrayScale:
objConfig.OPFlag = false;
objConfig.OPMessage = "上传的图片包含不正确的像素格式，不能加水印。";
objImg.Dispose();
return;
}
//将水印图像文件载入到另一个Image对象里
Image objWMImg = Image.FromFile(objConfig.WaterMarkImagePath);
// 将保存了图像文件的Image对象存到一个Graphics对象里
Graphics g = Graphics.FromImage(objImg);
MemoryStream objMS = new MemoryStream();
ImageAttributes imgAttr = new ImageAttributes();
FileStream objFS = null;
try
{
//获取要绘制图形坐标
int x = objImg.Width - objConfig.WaterMarkMarginRight;
int y = objImg.Height - objConfig.WaterMarkMarginBottom;
//设置颜色矩阵
float[][] matrixItems =
{
new float[] {
1,
0,
0,
0,
0
},
new float[] {
0,
1,
0,
0,
0
},
new float[] {
0,
0,
1,
0,
0
},
new float[] {
0,
0,
0,
Convert.ToSingle(objConfig.WaterMarkTransparent) / 100f,
0
},
new float[] {
0,
0,
0,
0,
1
}
};
ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
g.SmoothingMode = SmoothingMode.AntiAlias;
//在Graphics对象里绘制水印图像，此时，和这个Graphics对象相关联的服务器文件也跟着被画上了水印
g.DrawImage(objWMImg, new Rectangle(x, y, objWMImg.Width, objWMImg.Height), 0, 0, objWMImg.Width, objWMImg.Height, GraphicsUnit.Pixel, imgAttr);
//读取原来服务器端要写入水印的文件的文件类型
FileInfo objFile = new FileInfo(objConfig.ServerFileFullPath);
ImageFormat imageType = default(ImageFormat);
switch (objFile.Extension.ToLower())
{
case ".jpg":
imageType = ImageFormat.Jpeg;
break;
case ".jpeg":
imageType = ImageFormat.Jpeg;
break;
case ".gif":
imageType = ImageFormat.Gif;
break;
case ".png":
imageType = ImageFormat.Png;
break;
case ".bmp":
imageType = ImageFormat.Bmp;
break;
case ".tif":
imageType = ImageFormat.Tiff;
break;
case ".wmf":
imageType = ImageFormat.Wmf;
break;
case ".ico":
imageType = ImageFormat.Icon;
break;
default:
imageType = ImageFormat.Jpeg;
break;
}
// 将已经画好水印的Image对象保存到内存流中
objImg.Save(objMS, imageType);
// 将内存流以数组形式保存到图像数组里
byte[] imgData = objMS.ToArray();
//将写了水印的图像数组存入改了名的文件
objFS = new FileStream(RenameFile(objConfig.ServerFileFullPath), FileMode.Create, FileAccess.Write);
if ((objFS != null))
{
objFS.Write(imgData, 0, imgData.Length);
}
objConfig.OPFlag = true;
objConfig.ServerFileHasWMFullPath = RenameFile(objConfig.ServerFileFullPath);
}
catch (Exception ex)
{
throw ex;
}
finally
{
objFS.Close();
objFS.Dispose();
objFS = null;
objImg.Dispose();
objImg = null;
objWMImg.Dispose();
objWMImg = null;
g.Dispose();
g = null;
objMS.Close();
objMS.Dispose();
objMS = null;
imgAttr.Dispose();
imgAttr = null;
HelperFile.DeleteFile(objConfig.ServerFileHasWMFullPath);
}
}
// 用.net的FileUpload控件上传单个文件
public static ModelUploadFileConfig SaveULFileFromControl(System.Web.UI.WebControls.FileUpload objFU,
ModelUploadFileConfig objConfig)
{
if (!objFU.HasFile)
{
objConfig.OPFlag = false;
objConfig.OPMessage = "指定文件不存在";
return(objConfig);
}
string strULFileName = objFU.PostedFile.FileName;
string strULFileType = strULFileName.Substring(strULFileName.LastIndexOf(".") + 1).ToLower();
if (!CheckFileExt(strULFileType, objConfig))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "上传文件的格式不正确";
return(objConfig);
}
int intAllowSize = SetDefaultSize(strULFileType, objConfig);
if (Math.Round(Convert.ToDouble(objFU.PostedFile.ContentLength / 1024), 2) > intAllowSize)
{
objConfig.OPFlag = false;
objConfig.OPMessage = "系统允许您上传的文件类型的大小不能超过" + intAllowSize + "k";
return(objConfig);
}
if (objConfig.ThumbFlag)
{
if (!CheckImageFileExt(strULFileType, objConfig))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "不是图像文件，不能生成缩略图";
return(objConfig);
}
}
if (objConfig.WaterMarkImageFlag)
{
if (!CheckImageFileExt(strULFileType, objConfig))
{
objConfig.OPFlag = false;
objConfig.OPMessage = "不是图像文件，不能生成水印";
return(objConfig);
}
}
//开始保存文件
string strRootPath = HttpContext.Current.Request.PhysicalApplicationPath;
string strServerFilePath = CreateDateDir(SetDefaultDir(strULFileType, objConfig)) +
SetRnd14FileName() +
"." + strULFileType;
string strServerFileFullPath = strRootPath + strServerFilePath;
try
{
objFU.PostedFile.SaveAs(strServerFileFullPath);
}
catch (Exception ex)
{
objConfig.OPFlag = false;
objConfig.OPMessage = ex.Message;
return(objConfig);
}
//文件成功保存到服务器端
objConfig.OPFlag = true;
objConfig.ServerFilePath = strServerFilePath;
objConfig.ServerFileFullPath = strServerFileFullPath;
//如果是图片文件，可能有生成缩略图操作，或者加文字或图片水印操作
if (CheckImageFileExt(strULFileType, objConfig))
{
// 生成缩略图
if (objConfig.ThumbFlag)
{
SetThumbImage(objConfig);
}
// 加水印
if (objConfig.WaterMarkTxtFlag)
{
DrawTxtWaterMark(objConfig);
}
else if (objConfig.WaterMarkImageFlag)
{
DrawPicWaterMark(objConfig);
}
}
if (objConfig.OPFlag)
{
objConfig.OPMessage = "上传成功";
}
return(objConfig);
}
