using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Net;
using System.IO;
using KT_Product_Show_V3.Models;
using KT_Product_Show_V3.Controllers;
using System.Text.RegularExpressions;
using System.Drawing.Imaging; namespace KT_Product_Show_V3
{
public partial class ImageTool
{
public static string BuildImg(string webUrl, int Size, string directory)
{
Bitmap bmp;
System.Drawing.Image img;
string filename = "";
if (!Directory.Exists(directory))
{
return "";
}
WebRequest WebReq = WebRequest.Create(webUrl);
WebReq.Method = "GET";
img = System.Drawing.Image.FromStream(WebReq.GetResponse().GetResponseStream());
bmp = new Bitmap(Size, Size);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(, , Size, Size);
gr.DrawImage(img, rectDestination, , , img.Width, img.Height, GraphicsUnit.Pixel);
filename = DateTime.Now.ToFileTime().ToString() + "_" + Size + ".jpeg";
bmp.Save(directory + filename);
Qiniu_API.PutFile(directory + filename, filename);
bmp.Dispose();
img.Dispose();
return filename;
} public static string Base64StringToImage(string strsuffix, string strbase64)
{
string path = "C:\\DescripttionImg\\";
string FileName_withOutstrsuffix = DateTime.Now.ToString("yyMMddhhmmss") + Guid.NewGuid().ToString("N");
string FileName = string.Format(@"{0}.{1}", FileName_withOutstrsuffix, strsuffix);
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
try
{
byte[] arr = Convert.FromBase64String(strbase64);
MemoryStream ms = new MemoryStream(arr);
Bitmap bmp = new Bitmap(ms);
bmp.Save(path + FileName);
ms.Close(); Qiniu_API.PutFile(path + FileName, FileName); }
catch (Exception ex)
{ }
finally
{ }
return string.Format("http://{0}/{1}", Qiniu_API.Domain, FileName);
} public static string ImgToBase64String(string Imagefilename)
{
try
{
Bitmap bmp = new Bitmap(Imagefilename); MemoryStream ms = new MemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] arr = new byte[ms.Length];
ms.Position = ;
ms.Read(arr, , (int)ms.Length);
ms.Close();
return Convert.ToBase64String(arr);
}
catch (Exception ex)
{
return null;
}
} public static string DescripttionDecode(string str)
{
string pattern = @"data:image/[a-z]+;base64,([a-z0-9-A-z]|[\+]|[/\\]|[=])*";
string pattern_suffix = @"data:image/[a-z]+;base64,";
RegexOptions regexOptions = RegexOptions.None;
Regex regex = new Regex(pattern, regexOptions);
Regex regex_suffix = new Regex(pattern_suffix, regexOptions);
foreach (Match match in regex.Matches(str))
{
if (match.Success)
{
string path = "";
string Temp = regex_suffix.Match(match.Value).Value;
string suffix = Temp.Replace("data:image/", "").Replace(";base64,", "");
string base64 = match.Value.Replace(Temp, "");
path = Base64StringToImage(suffix, base64);
str = str.Replace(match.Value, path); }
} return str;
} public static string DescripttionDecodeCutMaxWidth(string str, int MaxWidth)
{
string pattern = @"data:image/[a-z]+;base64,([a-z0-9-A-z]|[\+]|[/\\]|[=])*";
string pattern_suffix = @"data:image/[a-z]+;base64,";
RegexOptions regexOptions = RegexOptions.None;
Regex regex = new Regex(pattern, regexOptions);
Regex regex_suffix = new Regex(pattern_suffix, regexOptions);
foreach (Match match in regex.Matches(str))
{
if (match.Success)
{
string path = "";
string Temp = regex_suffix.Match(match.Value).Value;
string suffix = Temp.Replace("data:image/", "").Replace(";base64,", "");
string base64 = match.Value.Replace(Temp, "");
path = Base64StringToImageCutMaxWidth(suffix, base64,MaxWidth);
str = str.Replace(match.Value, path); }
} return str;
}
public static string Base64StringToImageCutMaxWidth(string strsuffix, string strbase64, int MaxWidth)
{
string path = "C:\\DescripttionImg\\";
string FileName_withOutstrsuffix = DateTime.Now.ToString("yyMMddhhmmss") + Guid.NewGuid().ToString("N");
string FileName = string.Format(@"{0}.{1}", FileName_withOutstrsuffix, strsuffix);
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
try
{
byte[] arr = Convert.FromBase64String(strbase64);
MemoryStream ms = new MemoryStream(arr);
Bitmap bmp = new Bitmap(ms);
if (bmp.Width > MaxWidth)
{
bmp = KiResizeImage(bmp, MaxWidth, MaxWidth * bmp.Height / bmp.Width);
} // bmp.Width = MaxWidth;
// bmp.Height
bmp.Save(path + FileName);
ms.Close(); Qiniu_API.PutFile(path + FileName, FileName); }
catch (Exception ex)
{ }
finally
{ }
return string.Format("http://{0}/{1}", Qiniu_API.Domain, FileName);
}
public static Bitmap KiResizeImage(Bitmap bmp, int newW, int newH)
{
try
{
Bitmap b = new Bitmap(newW, newH);
Graphics g = Graphics.FromImage(b); // 插值算法的质量
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
g.DrawImage(bmp, new Rectangle(, , newW, newH), new Rectangle(, , bmp.Width, bmp.Height), GraphicsUnit.Pixel);
g.Dispose(); return b;
}
catch
{
return null;
}
} }
}
先上传到本地 然后到 七牛云 存储，最后 ，在 bbs 上显示 图片 直接 来源于七牛，本地也保存了一份，后续扩展到一键切换到本地读取功能。还可以使用负载均衡。
上面这个 图片操作类 还提供了 头像裁剪 之后 的 上传 大、小 图片 的方法。
[HttpPost]
[ValidateInput(false)]
public void AddDescripttion()
{
if (Request.Form["Descripttion"] == null)
{
Response.Write();
Response.End(); }
string str = Request.Form["Descripttion"].ToString();
Discuz discuz = new Discuz();
discuz.CreateTime = DateTime.Now;
discuz.Descripttion = ImageTool.DescripttionDecode(str);
discuz.Floor = conn.Database.SqlQuery<int>("select isnull( max(Floor),0) from dbo.Discuz").FirstOrDefault() + ;
discuz.ForumId = ;
discuz.IsFather = true;
discuz.Isgood = ;
discuz.IsPass = ;
discuz.UserId = ;
conn.Discuz.Add(discuz);
conn.SaveChanges();
Response.Write();
Response.End();
}
MVC bbs发表帖子 的调用 action , [ValidateInput(false)] 结合 网站 web.config 文件 中的 <system.webServer> 下的<validation validateIntegratedModeConfiguration="false" /> 一起用 ，才能解决
从客户端 中检测到有潜在危险的 Request.Form 值 报错的问题。
还介绍一个好的 Regex 工具
下载之后 我找了 半天 ，原来 在 这里啊！
img 的 src 属性 可以 是 data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA
AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
9TXL0Y4OHwAAAABJRU5ErkJggg==" > 这种不支持图片缓存。