fileupload.aspx.cs

本程序基于 asp.net 2.0 +sql server 2

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.Data.SqlClient;
using lalablog;
public partial class fileupload : System.Web.UI.Page
{
    string randFileName;
    string fullFileName;
    int userid;
    string  add_ip;
    int fileSize;
    DateTime  add_date;
    int userTotalFileSize;
    int perFileSize;
    int totalFileSize;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["userid"] == null)
            Response.Redirect("~/user/userLogin.aspx?url="+Server .HtmlEncode(Request .RawUrl ));
        else userid = Convert.ToInt32(Session["userid"]);

        writeSetting();

        if (IsPostBack && FileUpload1.HasFile)   uploadimg();
    }

    private string   getUserTotalFileSize()
    {
        string sql = "select sum(picSize) from pic where userid=" + this.userid;
        openDb open1 = new openDb(sql);
        return open1.getValue();
    }
    private void writeSetting()
    {
        firstpage f1 = new firstpage();
        f1.getSetting();
        this.perFileSize = f1.perFileSize;
        this.totalFileSize = f1.totalFileSize;

        //获取用户已经使用的空间大小
        string x = getUserTotalFileSize();
        if (x != "")
            this.userTotalFileSize = Convert.ToInt32(x);
        else
            this.userTotalFileSize = 0;

        setting.InnerHtml = "允许上传的文件类型为 jpeg/jpg/png/gif";
        setting.InnerHtml += "<br>允许上传的单个文件大小为" + perFileSize + "KB";
        setting.InnerHtml += "<br>您还可以使用的空间为" + (totalFileSize * 1000 - userTotalFileSize) / 1000 + "kB";
    }

    private string uploadimg()
    {
        Boolean fileOK = false;
        firstpage f1=new firstpage ();
        f1.getSetting ();
        int perFileSize = f1.perFileSize;
        int totalFileSize = f1.totalFileSize;

        string x = getUserTotalFileSize();
        if (x != "")
            this.userTotalFileSize = Convert.ToInt32(x);
        else
            this.userTotalFileSize = 0;
        
        //检验是否指定后缀
        if (FileUpload1.HasFile)
        {
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();

            String path = Server.MapPath("~/Uploadfiles/");
            randomTimeString rts = new randomTimeString();
            this.randFileName = rts.str +fileExtension ;
            this.fullFileName = path + randFileName;


            String[] allowedExtensions =  { ".gif", ".png", ".jpeg", ".jpg"};
            for (int i = 0; i < allowedExtensions.Length; i++)
            {
                if (fileExtension == allowedExtensions[i])
                    fileOK = true;
            }
            this.fileSize =FileUpload1.PostedFile.ContentLength;
        //利用postedFile.ContentLength来判断文件长度,检查是否符合文件大小,250000就是250k字节
            if (fileOK && this.fileSize  <perFileSize*1000 )
                fileOK = true;
            else
                fileOK = false;

            if (fileOK && this.userTotalFileSize < totalFileSize  * 1000)
                fileOK = true;
            else
                fileOK = false;
        }

        if (fileOK)
        {
            try
            {
                FileUpload1.PostedFile.SaveAs(this.fullFileName );

                saveToDb();

                System.Drawing.Image upimg = System.Drawing.Image.FromFile(this.fullFileName);
                hfWidth .Value =upimg.Width.ToString ();

                if (Convert.ToInt32(hfWidth.Value) > 400)
                    hfWidth.Value = "400";
                string path = Request.ApplicationPath;
                if (path != "/")
                    hfName.Value = path + "/uploadfiles/" + randFileName;
                else
                    hfName.Value = "/uploadfiles/" + randFileName;
                Image1.Visible = true;
                Image1.ImageUrl = "../uploadfiles/" + randFileName;
                Image1.Height  = 150;
            }
            catch (Exception ex)
            {
                displayJavaMsg(ex.Message);
            }
        }
        else
        {
            displayJavaMsg ("无法上传的文件类型或文件大小超过允许值");
        }
        return "";
    }

    private void  saveToDb()
    {
        this.add_date = DateTime.Now;
        this.add_ip = Request.UserHostAddress;

        string sql = "insert into pic (userid,picName,upfilename,picSize,add_date,add_ip) ";
        sql += "values(" + this.userid + ",'"+this.randFileName +"' ,'"+ this.randFileName + "'," + this.fileSize;
        sql += ",'" + this.add_date + "','" + this.add_ip + "')";

        openDb db1 = new openDb(sql);
        string msg = db1.update();

        //myfunc m1 = new myfunc(msg);
       // Response.Write(m1.JavaMsg());
    }

    private void displayJavaMsg(string str)
    { 
    Response .Write ("<div class=center><script type=text/javascript>alert('"+str +"');</script>");
    }
      
}