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用PHP+MySql编写聊天室
大家好！好久没有看到大家了，上次写了用PHP的通过文件操作的聊天室，当然是漏洞百出的，而且每一次刷新屏幕都很糟糕的！我想了好久，是不是能有一种方法不要刷新，就能取得发言的信息了？
多用一个框架就能实现这个效果了，即多用一个框架我们称为getmsg，我们让getmeg去取得信息而且保证每一次取得的信息是最新的，就是上次取得的发言就不要了，上次我编的就是每一次取得信息都是重复的，这样效果不好。
我的设计思想是：每一次发言，都把它提交到服务器上，然后保存到一个数据库里，每格几秒钟getmsg就去服务器上取得 最新发言数据，并保证上次取得的发言就不要取下来了，然后把取下来的发言叠加到一个专门显示发言的窗口(listmsg)去。这样我们就感觉listmsg窗口不会有重刷新的感觉而且，只是看到发言信息不断加进去，这样就有很好的效果，
怎样在一个框架把信息加到另个框架去了？用JavaScript就可以实现这个想法的：
<script language="JavaScript">
<!--
var win=parent.frames[0] //第一个框架即在文档中第一次出现的<frame>
var doc=win.document //获取文档
doc.write("发言信息")//这样就可以把信息加到另个frame里去了！
-->
</script>
当然你得在mysql里建两个表，一个表用于保存发言信息，一个表用于保存几个在线的，在列在线人数时，我们让它每个60秒刷新一次，并把一分钟以前的发言删掉，并看某个发言人是不是很长时间没发言了，是的话，就删掉他，
由于表的子段很简单，在这里就不要写出来了，看程序就会知道了。这个程序在网上网下测试的效果都很好！
表的名字是:chat和chat_getmsg
<!--主框架chat.php-->
<?PHP
if(!isset($username))
$username="guest";
$conid=mysql_connect("localhost","yourcounter","password");
mysql_select_db("yourdadabase",$conid);
$dstr=date("YmdHis");
$sql="insert chat_getmsg (username,shijian) values ('$username','$dstr')";
mysql_query($sql,$conid);
$sql="update chat_getmsg set shijian='$dstr' where username='$username'";
mysql_query($sql,$conid);
mysql_close($conid);
?>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<frameset rows="283,105" frameborder="YES" border="1" framespacing="0" cols="*">
<frameset cols="520,113" frameborder="yes" border="1" framespacing="0" rows="*">
<frame name="topFrame" scrolling="auto" border="1" noresize src="list.html" >
<frame name="rightFrame" scrolling="auto" border="1" noresize src="username.php">
</frameset>
<frameset rows="17,90" frameborder="yes" border="1" framespacing="0" cols="*">
<?PHP echo "<frame name="topFrame1" scrolling="NO" border="1" noresize src="getmsg1.php?username=$username">n"; ?>
<?PHP echo "<frame name="bottomFrame" scrolling="NO" border="1" noresize src="fayan.php?username=$username">n"; ?>
</frameset>
</frameset>
<noframes><body bgcolor="#FFFFFF">
</body></noframes>
</html>
<!--发言fayan.php -->
<?php
if(!isset($username))
$username="guest";
if(!isset($yanse))
$yanse="blue";
if(!isset($objectname))
$objectname="大家";
?>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
.normalfont { font-family: "宋体"; font-size: 10pt; font-weight: 800; color: #99FF33; height: auto; width: auto; left: 0px; top: 0px; clip: rect( )}
-->
</style>
</head>
<body bgcolor="#ff3333">
<form method="post" name="fayanform" action=<?PHP echo ""fayan.php?username=$username&yanse=$yanse&objectname=$objectname "";?> class="normalfont">
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="normalfont">
<tr>
<td width="17%" height="22"> 颜色:
<select id=yanse name="yanse">
<option value="blue" <?PHP if($yanse=="blue") echo "SELECTED";?> >Blue
<option value="red" <?PHP if($yanse=="red") echo "SELECTED";?> >red
<option value="green" <?PHP if($yanse=="green") echo "SELECTED";?> >green
<option value="yellow" <?PHP if($yanse=="yellow") echo "SELECTED";?> >yellow
<option value="brown" <?PHP if($yanse=="brown") echo "SELECTED";?> >brown
<option value="#ff00ff" <?PHP if($yanse=="#ff00ff") echo "SELECTED";?> >ff00ff
<option value="#bb00ff" <?PHP if($yanse=="#bb00ff") echo "SELECTED";?> >bb00ff
<option value="#clearcase/" target="_blank" >cc00ff" <?PHP if($yanse=="#cc00ff") echo "SELECTED";?> >cc00ff
<option value="#aa00ff" <?PHP if($yanse=="#aa00ff") echo "SELECTED";?> >aa00ff
<option value="#6600ff" <?PHP if($yanse=="#6600ff") echo "SELECTED";?> >6600ff
<option value="#7700ff" <?PHP if($yanse=="#7700ff") echo "SELECTED";?> >7700ff
<option value="#1100ff" <?PHP if($yanse=="#1100ff") echo "SELECTED";?> >1100ff
<option value="#11ffff" <?PHP if($yanse=="#11ffff") echo "SELECTED";?> >11ffff
<option value="#11aaff" <?PHP if($yanse=="#11aaff") echo "SELECTED";?> >11aaff
<option value="#1199ff" <?PHP if($yanse=="#1199ff") echo "SELECTED";?> >1199ff
<option value="#1133ff" <?PHP if($yanse=="#1133ff") echo "SELECTED";?> >1133ff
</select>
</td>
<td width="55%" height="22" class="normalfont">发言:
<input type="text" name="fayan" size=35 >
<input type="hidden" name="username" value=<?PHP echo ""$username""; ?> >
<input type="Button" name="Button" value="发言" onclick="submitfayan()">
</td>
<td width="28%" height="22"> </td>
</tr>
<tr>
<td width="17%" height="20">对象:
<input type="text" name="objectname" size=10 value=<?PHP echo ""$objectname"";?> >
</td>
<td width="55%" height="20" class="normalfont"><a href="http://chenlipan.oso.com.cn">回去</a> </td>
<td width="28%" height="20" class="normalfont" > </td>
</tr>
</table>
</form>
</body>
<Script language="JavaScript">
<!--
fayanform.fayan.focus()
function submitfayan()
{
if(fayanform.fayan.value!="")
fayanform.submit()
else
alert("不能发空信息")
fayanform.fayan.focus()
}
-->
</script>
</html>
<?PHP
if(isset($username)&&isset($fayan)){
$conid=mysql_connect("localhost","yourcount","yourpassword");
mysql_select_db("database",$conid);
$sql="insert chat (username,objectname,action,msg,color) values ("$username","$objectname","NO","$fayan","$yanse")";
mysql_query($sql,$conid);
mysql_close($conid);
}
?>
<!--获取发言信息getmsg.php-->
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<?PHP
$conid=mysql_pconnect("localhost","yourcount","password");
mysql_select_db("database",$conid);
if(!isset($username))
$username="getmsg";
$dt=time();
$newdate=date("YmdHis",$dt);
$fromdate=date("YmdHis",$dt-6);;
$sql="select username as name,msg,action,objectname ,shijian,color from chat where shijian>="$fromdate"";
$res=mysql_query($sql,$conid);
echo "<meta http-equiv="Refresh" content="6,url=getmsg.php?username=$username" >n";
echo "</head>n";
echo "<script language="JavaScript">n";
echo "<!--n";
echo "var win=parent.frames[0]n";
echo "var doc=win.documentn";
echo "var divlin=doc.body.all("lin")n";
while(list($name,$msg,$action,$objectname,$shijian,$color)=mysql_fetch_row($res))
{
if($objectname!="大家"||$objectname) $object="对 <a href=JavaScript:selectusername('$objectname')>$objectname</a> ";
echo "divlin.innerHTML=divlin.innerHTML+"<font color=$color size=3><a href=JavaScript:selectusername('$name')>$name</a> $object 说: $msg </font><br>"n";
}
echo "win.scrollBy(6000,6000)n";
echo "-->n";
echo "</script>n";
?>
<body bgcolor="#333333">
</body>
</html>
<!--欢迎词getmsg1.php -->
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<?PHP
if(!isset($username))
$username="guest";
echo "<meta http-equiv="Refresh" content="6;url=getmsg.php?username=$username" >n";
echo "</head>n";
echo "<script language="JavaScript">n";
echo "<!--hiden";
echo "var win=parent.frames[0]n";
echo "var doc=win.documentn";
echo "var divlin=doc.body.all("lin")n";
echo "divlin.innerHTML= "<font color=blue><b>欢迎 $username 的光临</b></font><br>"n";
echo "-->n";
echo "</script>n";
?>
<body bgcolor="#333333">
</body>
</html>
<!--显示发言list.html-->
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
.lin { font-size: 10pt; color: #FF6633}
-->
</style>
</head>
<body bgcolor="#FFFFFF" >
<center>
<div color=blue>
<font color=white size=6><b>
欢迎光临</b>
</marquee>
</div>
</center>
<div id=lin class="lin"></div>
</body>
<Script language="JavaScript">
<!--
function selectusername(str)
{
var win=parent.frames[3]
var doc=win.document
var form1=doc.body.all("fayanform")
form1.objectname.value=str
}
-->
</script>
</html>
<!--罗列在线人数-->
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta http-equiv="Refresh" content="60">
<style type="text/css">
<!--
.lin { font-size: 10pt; color: #ff0066}
-->
</style>
</head>
<body bgcolor="#33ff00" >
<center class="lin"><b>
在线人数 </b>
<hr>
<?PHP
if(!isset($username))
$username="guest";
$dt=time();
$newdate=date("YmdHis",$dt);
$fromdate=date("YmdHis",$dt-200);
$linkid=mysql_connect("localhost","yourcount","password");
mysql_select_db("yourdatabase",$linkid);
$sql="update chat_getmsg set shijian="$newdate" where username="$username"";
mysql_query($sql,$linkid);
$sql="select username from chat_getmsg where shijian>="$fromdate"";
$res=mysql_query($sql,$linkid);
while(list($username)=mysql_fetch_row($res)){
echo "<a href="JavaScript:selectusername('$username')">$username</a><br>n";
$fromdate=date("YmdHis",$dt-100);
$sql="delete from chat where shijian<="$fromdate"";
mysql_query($sql,$linkid);
mysql_close($linkid);
}
?>
</center>
<Script language="JavaScript">
<!--
function selectusername(str)
{
var win=parent.frames[3]
var doc=win.document
var form1=doc.body.all("fayanform")
form1.objectname.value=str
}
-->
</script>
</body>
</html>
