counter.aspx

ASP_NET程序设计教程 源代码 冶金工业出版社 肖金秀 冯沃辉 陈少涌

<%@ Page Language="JScript"%>
<%@ Import Namespace="System.IO" %>
<%@ Import namespace="System.Drawing" %>
<%@ Import namespace="System.Drawing.Imaging" %>
<%@ Import namespace="System.Drawing.Drawing2D" %>
<%
if(Request.QueryString("item")=="")
	return;
var itm :String = Request.QueryString("item");


var cookie:HttpCookie;
cookie = Request.Cookies("LastVisit");
//var readOnly:Boolean = (cookie!=null);
//将以下语句换成上面的语句即可防止刷新;
var readOnly:Boolean=false;
drawCounter(itm,readOnly);

if(!readOnly) {
	cookie = new HttpCookie("LastVisit",DateTime.Now.AddSeconds(10));
	cookie.Expires = DateTime.Now.AddSeconds(60);
	Response.AppendCookie(cookie);
}


function createCounter(nameOfItem:String)
{
	var sw : StreamWriter;
	var filePath:String = Server.MapPath("data\\") + nameOfItem + ".txt";
	if(!File.Exists(filePath)) {
		sw=File.CreateText(filePath);
		sw.WriteLine("0");
		sw.Close();
	}
}

function getCounterValue(nameOfItem:String,readOnly:Boolean) : String
{
	var fileIn:StreamReader = File.OpenText(Server.MapPath("data\\" + nameOfItem + ".txt"),FileMode.Open);
	var current : String = new String("");
	current = fileIn.ReadLine().ToString();
	fileIn.Close();
	if(readOnly)
		return current;
		
	var curInt : int = Convert.ToInt32(current);
	curInt++;
	var fs: FileStream  = new FileStream(Server.MapPath("data\\" + nameOfItem + ".txt"), FileMode.Open,FileAccess.Write);
	var sw : StreamWriter;
	sw  = new StreamWriter(fs);
	sw.WriteLine(Convert.ToString(curInt));
	sw.Close();
	fs.Close();
	return Convert.ToString(curInt);
}


function drawCounter(nameOfItem:String,readOnly:Boolean)
{
	createCounter(nameOfItem);
	var counterValue : String = getCounterValue(nameOfItem,readOnly);
	
	var height:int=20;
	var width:int=150;

	var bmp : Bitmap= new Bitmap(width, height);
	var g:Graphics = Graphics.FromImage(bmp);

	// Create a DarkBlue background
	g.FillRectangle(new SolidBrush(Color.Blue), 0, 0, width, height);
	// LightGreen  for the small box on the left...
	g.FillRectangle(new SolidBrush(Color.LightGreen), 0, 0, 55, 20);

	var maroonBrush:SolidBrush= new SolidBrush(Color.Maroon);
	var blackBrush:SolidBrush= new SolidBrush(Color.Black);
	
	var counterByFont:Font = new Font("宋体", 9, FontStyle.Bold);
	g.DrawString("访问人数", counterByFont,blackBrush ,0,5);
	//g.DrawString("华", counterByFont,maroonBrush ,12,5);
	//g.DrawString("网", counterByFont,blackBrush ,24,5);
	
	var counterFont:Font = new Font("Verdana", 8, FontStyle.Bold);
	var whiteBrush:SolidBrush= new SolidBrush(Color.White);
	var counterText : SizeF;

	counterText = g.MeasureString(counterValue,counterFont);
	g.DrawString(counterValue, counterFont, whiteBrush ,(bmp.Width)-((counterText.Width)+5),3);
	bmp.Save(Response.OutputStream, ImageFormat.Jpeg);

	g.Dispose();
	bmp.Dispose();
}
	

%>