/// <summary>
/// 通过文件流上传文件方法
/// </summary>
/// <param name="byteData">文件字节数组</param>
/// <param name="fileName">文件名</param>
/// <param name="isThumbnail">是否生成缩略图</param>
/// <param name="isWater">是否打水印</param>
/// <returns>上传成功返回JSON字符串</returns>
public string FileSaveAs(byte[] byteData, string fileName, bool isThumbnail, bool isWater)
{
try
{
string fileExt = Path.GetExtension(fileName).Trim('.'); //文件扩展名，不含“.”
string newFileName = Utils.GetRamCode() + "." + fileExt; //随机生成新的文件名
string newThumbnailFileName = "thumb_" + newFileName; //随机生成缩略图文件名
string upLoadPath = GetUpLoadPath(); //本地上传目录相对路径
string fullUpLoadPath = Utils.GetMapPath(upLoadPath); //本地上传目录的物理路径
string newFilePath = upLoadPath + newFileName; //本地上传后的路径
string newThumbnailPath = upLoadPath + newThumbnailFileName; //本地上传后的缩略图路径
byte[] thumbData = null; //缩略图文件流
//检查文件字节数组是否为NULL
if (byteData == null)
{
return("{\"status\": 0, \"msg\": \"请选择要上传的文件！\"}");
}
//检查文件扩展名是否合法
if (!CheckFileExt(fileExt))
{
return("{\"status\": 0, \"msg\": \"不允许上传" + fileExt + "类型的文件！\"}");
}
//检查文件大小是否合法
if (!CheckFileSize(fileExt, byteData.Length))
{
return("{\"status\": 0, \"msg\": \"文件超过限制的大小！\"}");
}
//如果是图片，检查图片是否超出最大尺寸，是则裁剪
if (IsImage(fileExt) && (this.sysConfig.imgmaxheight > 0 || this.sysConfig.imgmaxwidth > 0))
{
byteData = Thumbnail.MakeThumbnailImage(byteData, fileExt, this.sysConfig.imgmaxwidth, this.sysConfig.imgmaxheight);
}
//如果是图片，检查是否需要生成缩略图，是则生成
if (IsImage(fileExt) && isThumbnail && this.sysConfig.thumbnailwidth > 0 && this.sysConfig.thumbnailheight > 0)
{
thumbData = Thumbnail.MakeThumbnailImage(byteData, fileExt, this.sysConfig.thumbnailwidth, this.sysConfig.thumbnailheight, this.sysConfig.thumbnailmode);
}
else
{
newThumbnailPath = newFilePath; //不生成缩略图则返回原图
}
//如果是图片，检查是否需要打水印
if (IsWaterMark(fileExt) && isWater)
{
switch (this.sysConfig.watermarktype)
{
case 1:
byteData = WaterMark.AddImageSignText(byteData, fileExt, this.sysConfig.watermarktext, this.sysConfig.watermarkposition,
this.sysConfig.watermarkimgquality, this.sysConfig.watermarkfont, this.sysConfig.watermarkfontsize);
break;
case 2:
byteData = WaterMark.AddImageSignPic(byteData, fileExt, this.sysConfig.watermarkpic, this.sysConfig.watermarkposition,
this.sysConfig.watermarkimgquality, this.sysConfig.watermarktransparency);
break;
}
}
//检查本地上传的物理路径是否存在，不存在则创建
if (!Directory.Exists(fullUpLoadPath))
{
Directory.CreateDirectory(fullUpLoadPath);
}
//保存主文件
FileHelp.SaveFile(byteData, fullUpLoadPath + newFileName);
//保存缩略图文件
if (thumbData != null)
{
FileHelp.SaveFile(thumbData, fullUpLoadPath + newThumbnailFileName);
}
//处理完毕，返回JOSN格式的文件信息
return("{\"status\": 1, \"msg\": \"上传文件成功！\", \"name\": \""
+ fileName + "\", \"path\": \"" + newFilePath + "\", \"thumb\": \""
+ newThumbnailPath + "\", \"size\": " + byteData.Length + ", \"ext\": \"" + fileExt + "\"}");
}
catch
{
return("{\"status\": 0, \"msg\": \"上传过程中发生意外错误！\"}");
}
}