asp.net如何实现图片压缩!如何实现文件传输!
大家好：请问asp.net中如何实现图片压缩！如何实现文件传输!
谢谢大家，请大家多多帮忙！ --------------------编程问答-------------------- 我写的上传控件看看对你有没有帮助
/*
* 控件参数
*
* UploadPath 为图片保存的相对路径(使用该控件的页面相对于根目录的位置)
* IsSuccess 返回图片是否保存成功，在使用页面中可以捕获该变量来决定是否进行下一步操作
* FileName 存储上传的图片名
* ViewPicWidth 预览图片宽度
* ViewPicHeight 预览图片高度
* ImgMaxSize 允许上传图片的大小（以K为单位，默认15K）
* upload() 在使用页面中调用该方法即可保存图片
* MakeSmallPicture(...) 生成缩略图
*
* ---------------------------------------------------------------------------------
* 功能说明：
*
* 1.图片保存格式为：2007\1-19\49be57a0-2b2b-4e43-bd55-bf61f61cb559.JPG
* 2.上传图片时有预览的功能
* 3.修改时可以判断用户是否对图片做了修改，以防重覆上传
*
* ---------------------------------------------------------------------------------
* 使用例子：
*
* [test.aspx.cs]
*
* //保存图片
* protected void Button1_Click(object sender, EventArgs e)
{
//缩略图名(路径+文件名)
string strSmallPictureName = "D:/test.jpg";
//配制上传控件的保存图片路径(该页面相对于根目录的路径为 ../ 图片路径为 images/FocusPic )
this.ucUpload.UploadPath = "../" + "images/FocusPic";
//保存图片
this.ucUpload.upload();
//判断是否保存成功
if (this.ucUpload.IsSuccess == "false")
{
ShowClientMessegeBox("图片上传失败");
}
//写进数据库
//-----------------------------------------
//保存 this.ucUpload.FileName 到数据库相应字段即可
//-----------------------------------------
//生成缩略图(高度以给定值200为准，宽度按比例)
this.ucUpload.MakeSmallPicture(Server.MapPath("../" + PicConfigPath + this.ucUpload.FileName), strSmallPictureName, 150, 200);
//生成缩略图(宽度以给定值150为准，高度按比例)
this.ucUpload.MakeSmallPicture(Server.MapPath("../" + PicConfigPath + this.ucUpload.FileName), strSmallPictureName, 150, 200,"W");
//生成缩略图(以指定宽高缩略)
this.ucUpload.MakeSmallPicture(Server.MapPath("../" + PicConfigPath + this.ucUpload.FileName), strSmallPictureName, 150, 200, "HW");
//生成缩略图并添加文字水印
this.ucUpload.MakeSmallPicture(Server.MapPath("../" + PicConfigPath + this.ucUpload.FileName), strSmallPictureName, 150, 200, "H", "价值中国网", "");
//生成缩略图并添加图片水印
this.ucUpload.MakeSmallPicture(Server.MapPath("../" + PicConfigPath + this.ucUpload.FileName), strSmallPictureName, 150, 200, "H", "", "D:/BtSearch.gif");
}
*
* //修改图片
* this.ucUpload.FileName = gdoFocusPic.PicUrl; //将数据库中图片的路径传给用户控件
*
*
* [test.aspx]
*
* <%@ Register Src="../UserControls/upload.ascx" TagName="upload" TagPrefix="uc1" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<uc1:upload id="ucUpload" runat="server" ImgMaxSize="10" ViewPicWidth="150" ViewPicHeight="200"></uc1:upload>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</div>
</form>
</body>
</html>
*
*/ --------------------编程问答-------------------- using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Configuration;
using System.Drawing;
public partial class UserControls_CVUpload : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
imgView.Width = ViewPicWidth;
imgView.Height = ViewPicHeight;
}
protected void lbtnDelPic_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(UploadPath + FileName))
{
string fileName = UploadPath + FileName;
string path = Server.MapPath(fileName);
File.Delete(path);
}
}
#region 处理文件上传
public void upload()
{
if (this.upImage.Value != "" && this.upImage.Value != null)
{
string strPicturePath = this.GetMapPath();
Guid g = Guid.NewGuid();
DateTime time = DateTime.Now;
string pictureName = time.Year + "/" + time.Month + "-" + time.Day + "/";
string strFullPath = this.upImage.Value;
string strFileName = strFullPath.Substring(strFullPath.LastIndexOf("\\") + 1);
string strFileType = strFileName.Substring(strFileName.LastIndexOf(".") + 1);
string strFileType_toLower = strFileType.ToLower();
string filename = g.ToString() + "." + strFileType;
FileName = pictureName + filename;
if (strFileType_toLower == "jpg" || strFileType_toLower == "gif" || strFileType_toLower == "bmp")
{
this.upImage.PostedFile.SaveAs(Server.MapPath(strPicturePath) + g + "." + strFileType);
}
}
else
{
IsSuccess = "false";
}
}
#endregion
#region 创建图片文件夹并生成图片路径
public string GetMapPath()
{
string picTurePath = UploadPath;
DateTime time = DateTime.Now;
string year = time.Year.ToString();
string day = time.Month + "-" + time.Day;
string basePath = Server.MapPath(picTurePath).ToString();
string CreatePath = Server.MapPath(picTurePath + "\\" + year).ToString();
if (!Directory.Exists(CreatePath))
{
Directory.CreateDirectory(CreatePath);
DirectoryInfo directory = new DirectoryInfo(basePath);
string path = year + "\\" + day;
directory.CreateSubdirectory(path);
}
else
{
string nextPath = Server.MapPath(picTurePath + "\\" + year + "\\" + day).ToString();
if (!Directory.Exists(nextPath))
{
DirectoryInfo directory = new DirectoryInfo(basePath);
string path = year + "\\" + day;
directory.CreateSubdirectory(path);
}
}
return picTurePath + year + "/" + day + "/";
}
#endregion --------------------编程问答-------------------- #region 控件参数
//用于保存上传的文件
public string FileName
{
set
{
Session["FileName"] = value;
string strUrl = HttpContext.Current.Request.Url.PathAndQuery;
strUrl = strUrl.Substring(0, strUrl.LastIndexOf("/")+1);
if (strUrl.Length == 7)
{
strUrl = HttpContext.Current.Request.Url.PathAndQuery;
}
this.imgView.Src = strUrl + UploadPath + value;
}
get
{
return (string)Session["FileName"];
}
}
//图片保存相对路径
private string m_UplaodPath;
public string UploadPath
{
set { m_UplaodPath = value; }
get { return m_UplaodPath; }
}
//用于判断图片是否上传成功
private string m_strIsSuccess;
public string IsSuccess
{
get { return m_strIsSuccess; }
set { m_strIsSuccess = value; }
}
//预览图片大小设置
private int m_intViewPicHeight = 150;
public int ViewPicHeight
{
get
{
return m_intViewPicHeight;
}
set { m_intViewPicHeight = value; }
}
private int m_intViewPicWidth=120;
public int ViewPicWidth
{
get
{
return m_intViewPicWidth;
}
set { m_intViewPicWidth = value; }
}
//上传图片最大不能超过
private int m_intImgMaxSize = 15;
public int ImgMaxSize
{
get { return m_intImgMaxSize; }
set { m_intImgMaxSize = value; }
}
#endregion
#region 生成缩略图,添加水印
/// <summary>
/// 生成缩略图,添加文字/图片水印
/// </summary>
/// <param name="txtOriginalPicturePath">原图片路径</param>
/// <param name="txtSmallPicturePath">缩略图路径</param>
/// <param name="intWidth">缩略图宽度</param>
/// <param name="intHeight">缩略图高度</param>
/// <param name="strMode">缩略方式('H'--指定高,宽按比例,'W'--指定宽,高按比例,'HW'--按指定的宽高缩略)</param>
/// <param name="strSignetWordContent">添加文字水印（文字内容）</param>
/// <param name="strSignetPicturePath">添加图片水印（图片路径）</param>
public void MakeSmallPicture(string txtOriginalPicturePath, string txtSmallPicturePath, int intWidth, int intHeight, string strMode, string strSignetWordContent, string strSignetPicturePath)
{
System.Drawing.Image imgOriginalImage = System.Drawing.Image.FromFile(txtOriginalPicturePath);
int intToWidth = intWidth;
int intToHeight = intHeight;
int x = 0;
int y = 0;
int intOriginalWidth = imgOriginalImage.Width;
int intOriginalHeight = imgOriginalImage.Height;
switch (strMode)
{
case "HW"://指定高宽缩放（可能变形）
break;
case "W"://指定宽，高按比例
intToHeight = imgOriginalImage.Height * intWidth / imgOriginalImage.Width;
break;
case "H"://指定高，宽按比例
intToWidth = imgOriginalImage.Width * intHeight / imgOriginalImage.Height;
break;
case "CUT"://指定高宽裁减（不变形）
if ((double)imgOriginalImage.Width / (double)imgOriginalImage.Height > (double)intToWidth / (double)intToHeight)
{
intOriginalHeight = imgOriginalImage.Height;
intOriginalWidth = imgOriginalImage.Height * intToWidth / intToHeight;
y = 0;
x = (imgOriginalImage.Width - intOriginalWidth) / 2;
}
else
{
intOriginalWidth = imgOriginalImage.Width;
intOriginalHeight = imgOriginalImage.Width * intHeight / intToWidth;
x = 0;
y = (imgOriginalImage.Height - intOriginalHeight) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(intToWidth, intToHeight);
//新建一个画板
Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(imgOriginalImage, new Rectangle(0, 0, intToWidth, intToHeight), new Rectangle(x, y, intOriginalWidth, intOriginalHeight), GraphicsUnit.Pixel);
//文字水印
if (!string.IsNullOrEmpty(strSignetWordContent))
{
System.Drawing.Font f = new Font("宋体", 14);
System.Drawing.Brush b = new SolidBrush(Color.White);
g.DrawString(strSignetWordContent, f, b, (Convert.ToInt32(intToWidth / 2) - 20), Convert.ToInt32(intHeight / 2));
}
//图片水印
if (!string.IsNullOrEmpty(strSignetPicturePath))
{
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(strSignetPicturePath);
g.DrawImage(copyImage, new Rectangle(Convert.ToInt32((intToWidth - copyImage.Width) / 2), Convert.ToInt32((intToHeight - copyImage.Height) / 2), copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
copyImage.Dispose();
}
try
{
//以jpg格式保存缩略图
bitmap.Save(txtSmallPicturePath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
imgOriginalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
/// 生成缩略图,添加文字/图片水印
/// </summary>
/// <param name="txtOriginalPicturePath">原图片路径</param>
/// <param name="txtSmallPicturePath">缩略图路径</param>
/// <param name="intWidth">缩略图宽度</param>
/// <param name="intHeight">缩略图高度</param>
/// <param name="strMode">缩略方式('H'--指定高,宽按比例,'W'--指定宽,高按比例,'HW'--按指定的宽高缩略)</param>
public void MakeSmallPicture(string txtOriginalPicturePath, string txtSmallPicturePath, int intWidth, int intHeight, string strMode)
{
MakeSmallPicture(txtOriginalPicturePath, txtSmallPicturePath, intWidth, intHeight, strMode, "", "");
}
/// <summary>
/// 生成缩略图,添加文字/图片水印
/// </summary>
/// <param name="txtOriginalPicturePath">原图片路径</param>
/// <param name="txtSmallPicturePath">缩略图路径</param>
/// <param name="intWidth">缩略图宽度</param>
/// <param name="intHeight">缩略图高度</param>
public void MakeSmallPicture(string txtOriginalPicturePath, string txtSmallPicturePath, int intWidth, int intHeight)
{
MakeSmallPicture(txtOriginalPicturePath, txtSmallPicturePath, intWidth, intHeight, "HW", "", "");
}
#endregion
}
--------------------编程问答-------------------- 谢谢各位大哥帮助！ --------------------编程问答-------------------- 我的问题是：图片压缩的方式上船（图片压缩后，上传，然后在解压） --------------------编程问答-------------------- MakeSmallPicture为什么是调用自己？
public void MakeSmallPicture(string txtOriginalPicturePath, string txtSmallPicturePath, int intWidth, int intHeight)
{
MakeSmallPicture(txtOriginalPicturePath, txtSmallPicturePath, intWidth, intHeight, "HW ", " ", " ");
}
这么写能运行吗？
补充：.NET技术 , ASP.NET
