Asp.net上传图片,格式,大小,真伪,高级验证代码,Asp.Net代码库,德仔网

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【Asp.Net】 Asp.net上传图片,格式,大小,真伪,高级验证
作者:Dezai.CN / 发布于2013/3/7/ 647
Asp.net上传图片,格式,大小,真伪,高级验证

	using System;
	using System.Collections;
	using System.Configuration;
	using System.Data;
	using System.Linq;
	using System.Web;
	using System.Web.Security;
	using System.Web.UI;
	using System.Web.UI.HtmlControls;
	using System.Web.UI.WebControls;
	using System.Web.UI.WebControls.WebParts;
	using System.Xml.Linq;
	using System.Configuration;
	using System.Data.SqlClient;
	using System.IO;
	
	public partial class image_webUpload : System.Web.UI.Page
	{
	 public string ProgramTheme = ConfigurationManager.AppSettings["ProgramTheme"].ToString();
	 private string FileUploadFolder = ConfigurationManager.AppSettings["FileUploadFolder"].ToString();
	 private string connString = ConfigurationManager.ConnectionStrings["connString"].ConnectionString;
	 private string sql = "";
	 private int uid = 0;
	 protected void Page_Load(object sender, EventArgs e)
	 {
	 //uid = Convert.ToInt32(Request["uid"].ToString());
	 if (!this.Page.IsPostBack)
	 {
	 //if (uid > 0)
	 //{
	
	 //}
	 }
	 }
	
	
	 #region FileUpload
	 /// <summary>
	 /// 上传图片，高级验证
	 /// </summary>
	 /// <param name="folder">自定义用户文件夹</param>
	 /// <returns>返回文件在服务器存储路径，或者错误码</returns>
	 public string FileUpload(string folder)
	 {
	 string returnValue = "";
	
	 string ImgName = FileUpload1.FileName.Trim(); //获取文件名
	 string WebPath = HttpContext.Current.Server.MapPath("../" + FileUploadFolder + "/" + folder); //上传到指定路径
	 string Exten = System.IO.Path.GetExtension(FileUpload1.FileName).ToUpper(); //获取文件的扩展名
	 int ImgSize = 0;
	 if (FileUpload1.PostedFile != null)
	 {
	 ImgSize = FileUpload1.PostedFile.ContentLength; //此处取得的文件大小的单位是byte
	 if (ImgName != "")
	 {
	 //上传文件第一级文件扩展名和类型验证
	 if (Exten == ".GIF" || Exten == ".JPG" || Exten == ".PNG" || Exten == ".JPEG" || Exten == ".BMP")
	 {
	 if (ImgSize / 1024 < 100) //转换为KB，1(M)=1024(KB)=1024*1024(byte)
	 {
	 ImgName = DateTime.Now.ToString().Replace(" ", "").Replace(":", "").Replace("-", "") + Exten; //以当前时间来命名
	 if (!System.IO.Directory.Exists(WebPath))
	 { // 创建用户文件夹 folder
	 System.IO.Directory.CreateDirectory(WebPath);
	 }
	 //上传文件
	 FileUpload1.SaveAs(WebPath + "\\" + ImgName);
	 //高级验证
	 if (System.IO.File.Exists(WebPath + "\\" + ImgName))
	 {
	 System.Drawing.Image image2 = System.Drawing.Image.FromFile(WebPath + "\\" + ImgName);
	 if ((image2.Width <= 80) && (image2.Height <= 80))
	 {
	 //最后一部高级验证，图片上传后的操作，判断是否真的是图片
	 System.IO.FileStream fs = new System.IO.FileStream((WebPath + "\\" + ImgName), System.IO.FileMode.Open, System.IO.FileAccess.Read);
	 System.IO.BinaryReader r = new System.IO.BinaryReader(fs);
	 string fileclass = "";
	 byte buffer;
	 try
	 {
	 buffer = r.ReadByte();
	 fileclass = buffer.ToString();
	 buffer = r.ReadByte();
	 fileclass += buffer.ToString();
	 }
	 catch
	 { }
	 r.Close();
	 fs.Close();
	 if (fileclass == "255216" || fileclass == "7173" || fileclass == "6677" || fileclass == "13780")//说明255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar
	 {
	 returnValue = FileUploadFolder + "/" + folder + "/" + ImgName; //上传成功，上传图片合格，返回存储路径
	 }
	 else
	 {
	 System.IO.File.Delete((WebPath + "\\" + ImgName));
	 returnValue = "6"; //上传文件编码不正确，返回6;
	 }
	 }
	 else
	 {
	 System.IO.File.Delete((WebPath + "\\" + ImgName));
	 returnValue = "5"; //图片尺寸超标，返回5
	 }
	 image2.Dispose();
	 }
	 else
	 { returnValue = "4"; } //上传失败，返回4
	 }
	 else
	 { returnValue = "3"; } //文件大小超过100kb，返回3
	 }
	 else
	 { returnValue = "2"; } //上传文件格式错误，返回2
	 }
	 else
	 { returnValue = "1"; } //选择文件为空，返回1
	 }
	 else
	 { returnValue = "1"; } //选择文件为空，返回1
	 return returnValue;
	 }
	 #endregion
	
	 //上传按钮事件
	 protected void btnOK_Click(object sender, EventArgs e)
	 {
	 string flag=FileUpload(uid.ToString());
	
	 if(string.IsNullOrEmpty(flag))
	 {
	 showMsg(true,"操作失败！请重新上传。");
	 }
	 else if (flag == "1")
	 {
	 showMsg(true, "选择文件不能为空！");
	 }
	 else if (flag == "2")
	 {
	 showMsg(true, "上传文件格式错误！请换一张图片。");
	 }
	 else if (flag == "3")
	 {
	 showMsg(true, "文件大小超过100KB！请换一张图片。");
	 }
	 else if (flag == "4")
	 {
	 showMsg(true, "上传失败！请刷新页面重试。");
	 }
	 else if (flag == "5")
	 {
	 showMsg(true, "图片尺寸超标！请换一张图片。");
	 }
	 else if (flag == "6")
	 {
	 showMsg(true, "上传文件编码不正确！请换一张图片。");
	 }
	 else
	 {
	 showMsg(true, "上传成功。");
	 sql = "insert into tb_Photo(uid,photoalbum,photoUrl) values(" + uid + ",'我的相册','" + flag + "')";
	 SqlConnection conn = new SqlConnection(connString);
	 SqlCommand cmd = new SqlCommand(sql, conn);
	 try
	 {
	 conn.Open();
	 if (cmd.ExecuteNonQuery() > 0)
	 {
	 showMsg(true, "上传图片成功，插入数据库成功。");
	 }
	 }
	 catch (Exception)
	 { showMsg(true, "插入数据库出错！"); }
	 finally
	 { conn.Close(); }
	 }
	 }
	
	 // 标签控件显示提示信息
	 public void showMsg(bool _show, string _info)
	 {
	 this.labMsg.Visible = _show;
	 this.labMsg.Text = _info;
	 }
	}
	前台页面：
	<%@ Page Language="C#" AutoEventWireup="true" CodeFile="webUpload.aspx.cs" Inherits="image_webUpload" %>
	
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head runat="server">
	 <title>上传页面</title>
	</head>
	<body>
	 <form id="form1" runat="server">
	 <div>
	 请上传尺寸小于60*60，小于100Kb的格式为.jpg/.gif/.png的图片
	 
	 <asp:FileUpload ID="FileUpload1" runat="server" /><asp:Label ID="labMsg" runat="server" Text="提示信息" ForeColor="Red" Visible="False"></asp:Label>
	 
	 <asp:Button ID="btnOK" runat="server" Text="上 传" onclick="btnOK_Click" />
	 </div>
	 </form>
	</body>
	</html>
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