.Net 图片上传的一个类库的源码_有修改
上传图片到服务器上是网站开发中很常用的功能，它的实现也很简单，可以新建一个上传类UpLoadAndSaveImage，这个类中包含三个函数UpLoadAndSave，CreateFilePath，SaveToServer。使用时调用下面的UpLoadAndSave函数就可以了，该函数第一个参数为要上传的图片数据，第二个参数为上传的虚拟路径（相对路径），第三个参数为上传图片的格式，第四个参数为上传的物理路径。在这个函数中调用CreateFilePath函数产生随机的图片名称，最后再调用SaveToServer保存图片到服务器上。
public string UpLoadAndSave(byte[] data,refstring virPath,string fext,string physicPath)
{
// 返回文件物理地址，修改虚拟地址
if(data==null||virPath==null||fext==null||physicPath=="")
{
throw new Exception(" 非法参数" );
}
string rtnValue=SaveToServer(data,fext,physicPath,data.Length);
virPath += rtnValue;
physicPath+=rtnValue;
return physicPath;
}
private string CreateFilePath(string fext)
{
string filePath="";
Random rd=new Random();
filePath+=DateTime.Now.Year.ToString("0000");
filePath+=DateTime.Now.Month.ToString("00");
filePath+=DateTime.Now.Date.ToString("00");
filePath+=DateTime.Now.Hour.ToString("00");
filePath+=DateTime.Now.Minute.ToString("00");
filePath+=DateTime.Now.Second.ToString("00");
filePath+=DateTime.Now.Millisecond.ToString("00");
filePath+=rd.Next(99).ToString("00");
filePath+="."+fext;
return filePath;
}
private string SaveToServer(byte[] data,string fext,string physicPath,int fileLen)
{
string filePath=CreateFilePath(fext);
string rtnValue=filePath;
filePath=filePath.Insert(0,@physicPath);
if(File.Exists(filePath))
{
filePath=CreateFilePath(fext);
rtnValue=filePath;
}
FileStream fs=new FileStream(filePath,FileMode.CreateNew);
fs.Write(data,0,fileLen);
fs.Close();
return rtnValue;
}
//在其他页面调用该上传类，见下面的实例：
UpLoadAndSaveImage upload=new UpLoadAndSaveImage();
try
{
string virPath="UploadFiles/";
string physicPath=Server.MapPath(Request.ApplicationPath+"/"+"UploadFiles/");
string fext=this.File1.PostedFile.FileName;
if(fext.Length==0)
{
return;
}
fext=Path.GetExtension(fext).ToLower();
if(fext!=".jpg"&&fext!=".gif"&&fext!=".bmp"&&fext!=".doc"&&fext!=".rar"&&fext!=".zip"&&fext!=".jpeg")
{
Response.Write("<script>alert('Invalid file format,the file format must be jpg or jpeg or gif
or bmp or doc or rar or zip')</script>");
return;
}
byte[] data=newbyte[this.File1.PostedFile.ContentLength];
this.File1.PostedFile.InputStream.Read(data,0,this.File1.PostedFile.ContentLength);
physicPath=upload.UpLoadAndSave(data,ref virPath,fext,physicPath);
url=virPath;
if(Session["PhotoUrl"]==null)
{
ArrayList al=new ArrayList();
al.Add(physicPath);
Session["PhotoUrl"]=al;
}
else
{
ArrayList al2=(ArrayList)Session["PhotoUrl"];
al2.Add(physicPath);
Session["PhotoUrl"]=al2;
}
}
catch(Exception ex)
{
Response.Write("<script>alert('"+ex.Message+"');</script>");
}
// 如果要指定上传图片的大小，可以在调用该上传类前生成，见下面的实例：
try
{
empPic = new Bitmap(File1.PostedFile.InputStream);
}
catch
{
Script.Alert(" 图片格式错误！" );
return false;
}
Bitmap picSmall = new Bitmap(empPic,227,91); // 生成图片大小
MemoryStream stream = new MemoryStream();
picSmall.Save(stream,ImageFormat.Jpeg);
byte[] byteArray = stream.ToArray();
PathName1="Photo/";
PathName=Server.MapPath(Request.ApplicationPath+"/Photo/");
UpLoadAndSaveImage upimage=new UpLoadAndSaveImage();
PathName=upimage.UpLoadAndSave(byteArray,ref PathName1,".jpg",PathName);
以下是我曾经写的图片上传类，带水印功能：
//生成缩略图功能。
using System;
using System.IO;
using System.Web;
using System.Web.UI.HtmlControls;
using System.Drawing;
namespace LZX.upload
{
/// <summary>
/// 功能：上传文件操作(主要用于图片上传);
/// </summary>
public class upload
{
private int _Error = 0;//返回上传状态。
private int _MaxSize = 204800;//最大单个上传文件 (默认)
private string _FileType = "jpg/gif/bmp/png";//所支持的上传类型用"/"隔开
private string _SavePath = System.Web.HttpContext.Current.Server.MapPath("/uploadfiles/");//保存文件的实际路径
private int _SaveType = 0;//上传文件的类型，0代表自动生成文件名
private HtmlInputFile _FormFile;//上传控件。
private string _InFileName = "";//非自动生成文件名设置。
private string _OutFileName = "";//输出文件名。
private bool _IsCreateImg = true;//是否生成缩略图。
private bool _Iss = false;//是否有缩略图生成.
private int _Height = 0;//获取上传图片的高度
private int _Width = 0;//获取上传图片的宽度
private int _sHeight = 120;//设置生成缩略图的高度
private int _sWidth = 120;//设置生成缩略图的宽度
private bool _IsDraw = true;//设置是否加水印
private int _DrawStyle = 0;//设置加水印的方式０：文字水印模式，１：图片水印模式,2:不加
private int _DrawString_x = 10;//绘制文本的Ｘ坐标（左上角）
private int _DrawString_y = 10;//绘制文本的Ｙ坐标（左上角）
private string _AddText = "易盛传媒\nWWW.2800.CN";//设置水印内容
private string _Font = "宋体";//设置水印字体
private int _FontSize = 12;//设置水印字大小
private int _FileSize = 0;//获取已经上传文件的大小
private string _CopyIamgePath = System.Web.HttpContext.Current.Server.MapPath("/images/5dm_new.jpg") ;//图片水印模式下的覆盖图片的实际地址
/// <summary>
/// Error返回值，1、没有上传的文件。2、类型不允许。3、大小超限。4、未知错误。0、上传成功。
/// </summary>
public int Error
{
get { return _Error; }
}
/// <summary>
/// 最大单个上传文件
/// </summary>
public int MaxSize
{
set { _MaxSize = value; }
}
/// <summary>
/// 所支持的上传类型用"/"隔开
/// </summary>
public string FileType
{
set { _FileType = value; }
}
/// <summary>
/// //保存文件的实际路径
/// </summary>
public string SavePath
{
set { _SavePath = System.Web.HttpContext.Current.Server.MapPath(value); }
get { return _SavePath; }
}
/// <summary>
/// 上传文件的类型，0代表自动生成文件名
/// </summary>
public int SaveType
{
set { _SaveType = value; }
}
/// <summary>
/// 上传控件
/// </summary>
public HtmlInputFile FormFile
{
set { _FormFile = value; }
}
/// <summary>
/// //非自动生成文件名设置。
/// </summary>
public string InFileName
{
set { _InFileName = value; }
}
/// <summary>
/// 输出文件名
/// </summary>
public string OutFileName
{
get { return _OutFileName; }
set { _OutFileName = value; }
}
/// <summary>
/// 是否有缩略图生成.
/// </summary>
public bool Iss
{
get { return _Iss; }
}
/// <summary>
/// //获取上传图片的宽度
/// </summary>
public int Width
{
get { return _Width; }
}
/// <summary>
/// //获取上传图片的高度
/// </summary>
public int Height
{
get { return _Height; }
}
/// <summary>
/// 设置缩略图的宽度
/// </summary>
public int sWidth
{
get { return _sWidth; }
set { _sWidth = value; }
}
/// <summary>
/// 设置缩略图的高度
/// </summary>
public int sHeight
{
get { return _sHeight; }
set { _sHeight = value; }
}
/// <summary>
/// 是否生成缩略图
/// </summary>
public bool IsCreateImg
{
get { return _IsCreateImg; }
set { _IsCreateImg = value; }
}
/// <summary>
/// 是否加水印
/// </summary>
public bool IsDraw
{
get { return _IsDraw; }
set { _IsDraw = value; }
}
/// <summary>
/// 设置加水印的方式０：文字水印模式，１：图片水印模式,2:不加
/// </summary>
public int DrawStyle
{
get { return _DrawStyle; }
set { _DrawStyle = value; }
}
/// <summary>
/// 绘制文本的Ｘ坐标（左上角）
/// </summary>
public int DrawString_x
{
get { return _DrawString_x; }
set { _DrawString_x = value; }
}
/// <summary>
/// 绘制文本的Ｙ坐标（左上角）
/// </summary>
public int DrawString_y
{
get { return _DrawString_y; }
set { _DrawString_y = value; }
}
/// <summary>
/// 设置文字水印内容
/// </summary>
public string AddText
{
get { return _AddText; }
set { _AddText = value; }
}
/// <summary>
/// 设置文字水印字体
/// </summary>
public string Font
{
get { return _Font; }
set { _Font = value; }
}
/// <summary>
/// 设置文字水印字的大小
/// </summary>
public int FontSize
{
get { return _FontSize; }
set { _FontSize = value; }
}
public int FileSize
{
get { return _FileSize; }
set { _FileSize = value; }
}
/// <summary>
/// 图片水印模式下的覆盖图片的实际地址
/// </summary>
public string CopyIamgePath
{
set { _CopyIamgePath = System.Web.HttpContext.Current.Server.MapPath(value); }
}
//获取文件的后缀名
private string GetExt(string path)
{
return Path.GetExtension(path);
}
//获取输出文件的文件名。
private string FileName(string Ext)
{
if (_SaveType == 0 || _InFileName.Trim() == "")
return DateTime.Now.ToString("yyyyMMddHHmmssfff") + Ext;
else
return _InFileName;
}
//检查上传的文件的类型，是否允许上传。
private bool IsUpload(string Ext)
{
Ext = Ext.Replace(".", "");
bool b = false;
string[] arrFileType = _FileType.Split('/');
foreach (string str in arrFileType)
{
if (str.ToLower() == Ext.ToLower())
{
b = true;
break;
}
}
return b;
}
//缩略图按比例缩放大小
private void mtSetSize(ref Int32 iWidth_, ref Int32 iHeight_,Int32 iSetWidth, Int32 iSetHeight)
{
Single iWidth=(Single)iWidth_;
Single iHeight=(Single)iHeight_;
if(iWidth>iHeight)
{
if(iWidth>iSetWidth)
{
iHeight=iHeight-(iHeight/(iWidth/(iWidth-iSetWidth)));
iWidth=iSetWidth;
}
}
if(iWidth<iHeight)
{
if(iHeight>iSetHeight)
{
iWidth=iWidth-(iWidth/(iHeight/(iHeight-iSetHeight)));
iHeight=iSetHeight;
}
}
if(iWidth==iHeight)
{
if(iHeight>iSetHeight)
{
iHeight=iSetHeight;
iWidth=iSetWidth;
}
}
iWidth_=(Int32)iWidth;
iHeight_=(Int32)iHeight;
} // end private static void mtSetSize
//int_Height int_Width 指定高度和指定宽度 input_Imgfile,out_ImgFile为原图片和缩小后图片的路径,out_FileName为输出文件名
private void Thumbnail(int int_Width, int int_Height, FileStream input_ImgFile, string out_ImgFile, string out_FileName)
{
System.Drawing.Image oldimage = System.Drawing.Image.FromStream(input_ImgFile);
float New_Width; // 新的宽度
float New_Height; // 新的高度
float Old_Width,Old_Height; //原始高宽
int flat = 0;//标记图片是不是等比
int xPoint = 0;//若果要补白边的话，原图像所在的x，y坐标。
int yPoint=0;
//判断图片
Old_Width = (float)oldimage.Width;
Old_Height = (float)oldimage.Height;
if ((Old_Width / Old_Height) > ((float)int_Width / (float)int_Height)) //当图片太宽的时候
{
New_Height = Old_Height * ((float)int_Width / (float)Old_Width);
New_Width = (float)int_Width;
//此时x坐标不用修改
yPoint = (int)(((float)int_Height - New_Height) / 2);
flat = 1;
}
else if ((oldimage.Width / oldimage.Height) == ((float)int_Width / (float)int_Height))
{
New_Width = int_Width;
New_Height = int_Height;
}
else
{
New_Width = (int)oldimage.Width * ((float)int_Height / (float)oldimage.Height); //太高的时候
New_Height = int_Height;
//此时y坐标不用修改
xPoint = (int)(((float)int_Width - New_Width) / 2);
flat = 1;
}
// ＝＝＝缩小图片＝＝＝
System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage((int)New_Width, (int)New_Height, null, IntPtr.Zero);
Bitmap bm = new Bitmap(thumbnailImage);
if (flat != 0)
{
Bitmap bmOutput = new Bitmap(int_Width,int_Height);
Graphics gc = Graphics.FromImage(bmOutput);
SolidBrush tbBg = new SolidBrush(Color.White);
gc.FillRectangle(tbBg,0, 0, int_Width, int_Height); //填充为白色
gc.DrawImage(bm,xPoint, yPoint, (int)New_Width, (int)New_Height);
// bmOutput.Save(out_ImgFile);
bmOutput.Save(out_ImgFile + out_FileName.Split('.').GetValue(0).ToString() + "_s." + out_FileName.Split('.').GetValue(1).ToString());
}
else
{
//bm.Save(out_ImgFile);
bm.Save(out_ImgFile + out_FileName.Split('.').GetValue(0).ToString() + "_s." + out_FileName.Split('.').GetValue(1).ToString());
}
}
//上传主要部分。
public void Open()
{
HttpPostedFile hpFile = _FormFile.PostedFile;
if (hpFile == null || hpFile.FileName.Trim() == "")
{
_Error = 1;
return;
}
string Ext = GetExt(hpFile.FileName);
// Common.common.msgscript("", Ext);
if (!IsUpload(Ext))
{
_Error = 2;
return;
}
int iLen = hpFile.ContentLength;
if (iLen > _MaxSize)
{
_Error = 3;
return;
}
try
{
if (!Directory.Exists(_SavePath))
Directory.CreateDirectory(_SavePath);
byte[] bData = new byte[iLen];
hpFile.InputStream.Read(bData, 0, iLen);
string FName;
FName = FileName(Ext);
string TempFile = "";
if (_IsDraw)
{
TempFile = FName.Split('.').GetValue(0).ToString() + "_temp." + FName.Split('.').GetValue(1).ToString();
}
else
{
TempFile = FName;
}
FileStream newFile = new FileStream(_SavePath + TempFile, FileMode.Create);
newFile.Write(bData, 0, bData.Length);
newFile.Flush();
int _FileSizeTemp = hpFile.ContentLength;
if (_IsDraw)
{
if (_DrawStyle == 0)
{
System.Drawing.Image Img1 = System.Drawing.Image.FromStream(newFile);
Graphics g = Graphics.FromImage(Img1);
g.DrawImage(Img1, 100, 100, Img1.Width, Img1.Height);
Font f = new Font(_Font, _FontSize);
Brush b = new SolidBrush(Color.Red);
string addtext = _AddText;
g.DrawString(addtext, f, b, _DrawString_x, _DrawString_y);
g.Dispose();
Img1.Save(_SavePath + FName);
Img1.Dispose();
}
else
{
System.Drawing.Image image = System.Drawing.Image.FromStream(newFile);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(_CopyIamgePath);
Graphics g = Graphics.FromImage(image);
g.DrawImage(copyImage, new Rectangle(image.Width - copyImage.Width - 5, image.Height - copyImage.Height - 5, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
g.Dispose();
image.Save(_SavePath + FName);
image.Dispose();
}
}
try
{
////获取图片的高度和宽度
//System.Drawing.Image Img = System.Drawing.Image.FromStream(newFile);
//_Width = Img.Width;
//_Height = Img.Height;
//mtSetSize(ref _Width, ref _Height, _sWidth, _sHeight);
//生成缩略图部分
if (_IsCreateImg)
{
////如果上传文件小于15k，则不生成缩略图。
//if (iLen > 15360)
//{
// System.Drawing.Image newImg = Img.GetThumbnailImage(_Width, _Height, null, System.IntPtr.Zero);
// newImg.Save(_SavePath + FName.Split('.').GetValue(0).ToString() + "_s." + FName.Split('.').GetValue(1).ToString());
// newImg.Dispose();
// _Iss = true;
//}
//按比例生成固定大小的缩略图，比例不等主动补白边
Thumbnail(_sWidth, _sHeight, newFile, _SavePath, FName);
_Iss = true;
}
if (_IsDraw)
{
if (File.Exists(_SavePath + FName.Split('.').GetValue(0).ToString() + "_temp." + FName.Split('.').GetValue(1).ToString()))
{
newFile.Dispose();
File.Delete(_SavePath + FName.Split('.').GetValue(0).ToString() + "_temp." + FName.Split('.').GetValue(1).ToString());
}
}
}
catch { }
newFile.Close();
newFile.Dispose();
_OutFileName = FName;
_FileSize = _FileSizeTemp;
_Error = 0;
return;
}
catch
{
_Error = 4;
return;
}
}
}
}
