public class cl_file_upload : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
context.Response.Charset = "UTF-8";
UploadFileResult result = new UploadFileResult();
string savePath = "/attem";
string dirPath = context.Server.MapPath(savePath);
HttpPostedFile PostedFile = context.Request.Files[0];
// 读取原始文件名
string LocalName = PostedFile.FileName;
// 初始化byte长度.
byte[] File = new Byte[PostedFile.ContentLength];
// 转换为byte类型
System.IO.Stream stream = PostedFile.InputStream;
string filename, error;
if (CheckFile(File, "jpg,jpeg,gif,png,doc,docx,xls,xlsx,ppt,pptx,pdf", LocalName, 4097152, "1", out error, out filename))
{
string path = dirPath + @"\" + filename;
context.Request.Files[0].SaveAs(path);
result.result = 1;
result.url = savePath + "/" + filename;
result.localname = jsonString(LocalName);
}
else
{
result.result = 0;
result.error = error;
}
context.Response.Write(JsonHelp.ObjToJsonStr(result));
}
string jsonString(string str)
{
str = str.Replace("\\", "\\\\");
str = str.Replace("/", "\\/");
str = str.Replace("‘", "\\‘");
return str;
}
string GetFileExt(string FullPath)
{
if (FullPath != "") return FullPath.Substring(FullPath.LastIndexOf(‘.‘) + 1).ToLower();
else return "";
}
void CreateFolder(string FolderPath)
{
if (!System.IO.Directory.Exists(FolderPath)) System.IO.Directory.CreateDirectory(FolderPath);
}
/// <summary>
/// 检测上传文件的有效性
/// </summary>
/// <param name="file">文件</param>
/// <param name="file_ext">允许上传的扩展名</param>
/// <param name="localname">本地文件名称，带扩展名</param>
/// <param name="max_size">允许上传文件最大大小</param>
/// <param name="error">错误信息</param>
/// <param name="filename">最终生成的文件名</param>
/// <returns></returns>
bool CheckFile(byte[] file, string file_ext, string localname, int max_size, string CreateFileNameType, out string error, out string filename)
{
error = "";
filename = "";
if (file.Length == 0)
{
error = "无数据提交";
return false;
}
if (file.Length > max_size)
{
error = "文件大小超过" + max_size + "字节";
return false;
}
// 取上载文件后缀名
string extension = GetFileExt(localname);
if (("," + file_ext + ",").IndexOf("," + extension + ",") < 0)
{
error = "上传文件扩展名必需为：" + file_ext;
return false;
}
if (CreateFileNameType == "1")
{
Random random = new Random(DateTime.Now.Millisecond);
filename = DateTime.Now.ToString("yyyyMMddhhmmss") + random.Next(10000) + "." + extension;
}
else
{
filename = localname;
}
return true;
}
/// <summary>
///
/// </summary>
/// <param name="create_originalImageName">是否保存原图</param>
/// <param name="originalImage">原图</param>
/// <param name="imageServerRootDirectory">保存根目录</param>
/// <param name="imageSubDirectory">图片目录</param>
/// <param name="originalImageName">原图新名称</param>
/// <param name="thumbnailName_small">缩略小图名称</param>
/// <param name="maxSize_small">缩略小图最大尺寸</param>
/// <param name="thumbnailName_big">缩略小图名称</param>
/// <param name="maxSize_big">缩略大图最大尺寸</param>
/// <returns></returns>
protected bool Make_thumbnail_Image_big_small(bool create_originalImageName, System.Drawing.Image originalImage, string imageServerRootDirectory, string imageSubDirectory, string originalImageName, string thumbnailName_small, int maxSize_small, string thumbnailName_big, int maxSize_big)
{
string thumbnailPath = imageServerRootDirectory + "\\" + imageSubDirectory + "\\" + thumbnailName_big;
string originalImagePath = imageServerRootDirectory + "\\" + imageSubDirectory + "\\" + originalImageName;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
int towidth = 0;
int toheight = 0;
if (ow < maxSize_big && oh < maxSize_big)
{
towidth = ow;
toheight = oh;
}
else
{
#region 计算比例
if (ow > oh) // 宽 比 高 大
{
decimal YuanShiBiLi = (decimal)oh / (decimal)ow;
towidth = (ow > maxSize_big) ? maxSize_big : ow;
toheight = (int)(YuanShiBiLi * towidth);
}
else
{
decimal BiLi = (decimal)ow / (decimal)oh;
toheight = (oh > maxSize_big) ? maxSize_big : oh;
towidth = (int)(toheight * BiLi);
}
#endregion
}
#region 大图
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//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.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),//在指定位置并且按指定大小绘制原图片的指定部分
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);
try
{
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); //以jpg格式保存缩略图
}
catch (System.Exception e)
{
throw e;
}
#endregion
if (thumbnailName_small.Length > 2)
{
#region small 小图
{
int x_small = 0;
int y_small = 0;
int ow_small = towidth;
int oh_small = toheight;
int towidth_small = 0;
int toheight_small = 0;
if (ow_small > oh_small)
{
decimal bili_small = (decimal)oh_small / (decimal)ow_small;
towidth_small = (ow_small > maxSize_small) ? maxSize_small : ow_small;
toheight_small = (int)(bili_small * towidth_small);
}
else
{
decimal bili_small = (decimal)ow_small / (decimal)oh_small;
toheight_small = (oh_small > maxSize_small) ? maxSize_small : oh_small;
towidth_small = (int)(bili_small * toheight_small);
}
//新建一个bmp图片
System.Drawing.Image bitmap_small = new System.Drawing.Bitmap(towidth_small, toheight_small);
//新建一个画板
System.Drawing.Graphics g_small = System.Drawing.Graphics.FromImage(bitmap_small);
//设置高质量插值法
g_small.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
g_small.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
//清空画布并以透明背景色填充
g_small.Clear(System.Drawing.Color.Transparent);
System.Drawing.Image originalImage_small = bitmap;
g_small.DrawImage(originalImage_small, new System.Drawing.Rectangle(0, 0, towidth_small, toheight_small),//在指定位置并且按指定大小绘制原图片的指定部分
new System.Drawing.Rectangle(x_small, y_small, ow_small, oh_small),
System.Drawing.GraphicsUnit.Pixel);
string thumbnailPath_small = imageServerRootDirectory + "\\" + imageSubDirectory + "\\" + thumbnailName_small;
try
{
bitmap_small.Save(thumbnailPath_small, System.Drawing.Imaging.ImageFormat.Jpeg); //以jpg格式保存缩略图
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage_small.Dispose();
bitmap_small.Dispose();
g_small.Dispose();
}
}
#endregion
}
if (create_originalImageName == true)
{
originalImage.Save(originalImagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
try
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
catch (Exception ex)
{
}
return true;
}
public bool IsReusable
{
get
{
return false;
}
}
}
时间： 2024-04-15 06:31:14