PHP+mysql+ajax轻量级聊天室实现方法详解

2024-05-04 22:51:50

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本文实例讲述了PHP+mysql+ajax轻量级聊天室实现方法。分享给大家供大家参考，具体如下：

做了一个QQ聊天交友网站，想加个聊天的功能，于是做完用PHP做了简单又强大的聊天室

1. 创建mysql数据库表：
代码如下:create table chat( id bigint AUTO_INCREMENT,username varchar(20), chatdate datetime,msg varchar(500), primary key(id));

2.编写建议连接数据库函数：

dbconnect.php

<?phpfunction db_connect(){ date_default_timezone_set("Asia/Shanghai"); $link = mysql_connect("xxx.xxx.xxx.xxx", "databasename", "password")      or die('无法连接: ' . mysql_error()); mysql_select_db("databasename") or die('没有你找到指定数据库'); return true;}function quote($strText){  $Mstr = addslashes($strText);  return "'" . $Mstr . "'";}function isdate($d){  $ret = true;  try  {    $x = date("d",$d);  }  catch (Exception $e)  {    $ret = false;  }  echo $x;  return $ret;}?>

3. 编写ajax发送和接收函数：

ajax发送函数chat_send_ajax.php

<?php   require_once('dbconnect.php');   db_connect();   $msg = iconv("UTF-8","GB2312",$_GET["msg"]);   $dt = date("Y-m-d H:i:s");   $user = iconv("UTF-8","GB2312",$_GET["name"]);   $sql="INSERT INTO chat(USERNAME,CHATDATE,MSG) " .     "values(" . quote($user) . "," . quote($dt) . "," . quote($msg) . ");";     echo $sql;   $result = mysql_query($sql);   if(!$result)   {    throw new Exception('Query failed: ' . mysql_error());    exit();   }?>

ajax接收函数chat_recv_ajax.php

<?phpheader("Content-Type:text/html;charset=gb2312");header("Expires: Thu, 01 Jan 1970 00:00:01 GMT");  header("Cache-Control: no-cache, must-revalidate");  header("Pragma: no-cache");   require_once('dbconnect.php');   db_connect();   $sql = "SELECT *, date_format(chatdate,'%Y年%m月%d日 %r') as cdt from chat order by ID desc limit 200";   $sql = "SELECT * FROM (" . $sql . ") as ch order by ID";   $result = mysql_query($sql) or die('Query failed: ' . mysql_error());   // Update Row Information   $msg="<table border='0' style='font-size: 10pt; color: white; font-family: verdana, arial;'>";   while ($line = mysql_fetch_array($result, MYSQL_ASSOC))   {      $msg = $msg . "<tr><td>" . $line["cdt"] . " </td>" .        "<td>" . $line["username"] . ": </td>" .        "<td>" . $line["msg"] . "</td></tr>";   }   $msg=$msg . "</table>";   echo $msg;?>

4.聊天室页面：

chat.html

<!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><meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  <title>聊天页面</title><script type="text/javascript">var t = setInterval(function(){get_chat_msg()},5000);//// General Ajax Call//var oxmlHttp;var oxmlHttpSend;function get_chat_msg(){  if(typeof XMLHttpRequest != "undefined")  {    oxmlHttp = new XMLHttpRequest();  }  else if (window.ActiveXObject)  {    oxmlHttp = new ActiveXObject("Microsoft.XMLHttp");  }  if(oxmlHttp == null)  {    alert("浏览器不支持XML Http Request！");    return;  }  oxmlHttp.onreadystatechange = get_chat_msg_result;  oxmlHttp.open("GET",encodeURI("chat_recv_ajax.php"),true);  oxmlHttp.send(null);}function get_chat_msg_result(){  if(oxmlHttp.readyState==4 || oxmlHttp.readyState=="complete")  {    if (document.getElementById("DIV_CHAT") != null)    {      document.getElementById("DIV_CHAT").innerHTML = oxmlHttp.responseText;      oxmlHttp = null;    }    var scrollDiv = document.getElementById("DIV_CHAT");    scrollDiv.scrollTop = scrollDiv.scrollHeight;  }}function set_chat_msg(){  if(typeof XMLHttpRequest != "undefined")  {    oxmlHttpSend = new XMLHttpRequest();  }  else if (window.ActiveXObject)  {    oxmlHttpSend = new ActiveXObject("Microsoft.XMLHttp");  }  if(oxmlHttpSend == null)  {    alert("浏览器不支持XML Http Request！");    return;  }  var url = "chat_send_ajax.php";  var strname="noname";  var strmsg="";  if (document.getElementById("txtname") != null)  {    strname = document.getElementById("txtname").value;    document.getElementById("txtname").readOnly=true;  }  if (document.getElementById("txtmsg") != null)  {    strmsg = document.getElementById("txtmsg").value;    document.getElementById("txtmsg").value = "";  }  url += "?name=" + strname + "&msg=" + strmsg;  oxmlHttpSend.open("GET",encodeURI(url),true);  oxmlHttpSend.send(null);}function clickBtn(e) {  if(window.event.keyCode==13)  {  var id=e.id;  switch(id)  {   case "txtmsg":   document.getElementById("Submit2").click();   window.event.returnValue=false;   break;   }  }}function fRandomBy(under, over){switch(arguments.length){case 1: return parseInt(Math.random()*under+1);case 2: return parseInt(Math.random()*(over-under+1) + under);default: return 0;}}function SetTxtName(){var i=fRandomBy(10);if(i==0)document.getElementById('txtname').value='无敌战神';if(i==1)document.getElementById('txtname').value='令狐冲';if(i==2)document.getElementById('txtname').value='西门吹雪';if(i==3)document.getElementById('txtname').value='超级玛丽';if(i==4)document.getElementById('txtname').value='奥巴马';if(i==5)document.getElementById('txtname').value='恐怖分子';if(i==6)document.getElementById('txtname').value='聊斋奇女子';if(i==7)document.getElementById('txtname').value='天朝?潘?;if(i==8)document.getElementById('txtname').value='中500万了';if(i==9)document.getElementById('txtname').value='神级奇葩';if(i==10)document.getElementById('txtname').value='爱你不是两三天';}</script></head><body onload="SetTxtName();">  <div style="border-right: black thin solid; border-top: black thin solid;    border-left: black thin solid; border-bottom: black thin solid;    background:#fff url('http://www.ihaonet.com/chat/blue.jpg') repeat-x left top;    height: 450px;width: 500px; ">    <table style="width:100%; height:100%">      <tr>        <td colspan="2" style="font-weight: bold; font-size: 16pt; color: white; font-family: verdana, arial;          text-align: center">          聊天窗口--全球最大QQ聊天交友网站</td>      </tr>      <tr>        <td colspan="2" style="font-weight: bold; font-size: 16pt; color: white; font-family: verdana, arial;          text-align: left">          <table style="font-size: 12pt; color: white; font-family: Verdana, Arial;border: white thin solid; ">            <tr>              <td style="width: 100px">                名字:</td>              <td style="width: 100px"><input id="txtname" style="width: 150px" type="text" name="name" maxlength="15" value="匿名" /></td>            </tr>          </table>        </td>      </tr>      <tr>        <td style="vertical-align: middle;" valign="middle" colspan="2">          <div style="width: 480px; height: 300px; border-right: white thin solid; border-top: white thin solid; font-size: 10pt; border-left: white thin solid; border-bottom: white thin solid; font-family: verdana, arial; overflow:scroll; text-align: left;" id="DIV_CHAT">          </div>        </td>      </tr>      <tr>        <td style="width: 310px">          <input id="txtmsg" style="width: 350px" type="text" name="msg" onkeydown="return clickBtn(this)"/></td>        <td style="width: 85px">          <input id="Submit2" style="font-family: verdana, arial" type="button" value="发送" onclick="set_chat_msg()"/></td>      </tr>      <tr>        <td colspan="1" style="font-family: verdana, arial; text-align: center; width: 350px;">          </td>        <td colspan="1" style="width: 85px; font-family: verdana, arial; text-align: center">        </td>      </tr>    </table>  </div></body></html>

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