PHP实现长轮询消息实时推送功能代码实例讲解

本文实例讲述了PHP实现的消息实时推送功能。分享给大家供大家参考,具体如下:

入口文件index.html

<!DOCTYPE HTML>
<html>
<head>
 <title>反ajax推送</title>
 <style>
  .send{color:#555;text-align: left;}
  .require{color:blue;text-align: right;}
  .content_box{text-align: center;margin: 20px;
     border: 1px solid #ddd;padding: 20px;}
 </style>
 <script src=\"http://code.jQuery.com/jquery-1.11.2.min.js\"></script>
</head>
<body>
 <div class=\"content_box\" id=\"content_box_title\" style=\"border: none;\">消息框</div>
 <div class=\"content_box\" id=\"content_box\">
 </div>
 <div style=\"width: 450px;margin: 0 auto;\">
  <select id=\"username\" style=\"font-size: 20px;\">
   <option value=\"1\" selected=\"selected\">1</option>
   <option value=\"2\">2</option>
  </select>
  <input type=\"text\" style=\"font-size: 20px;\" value=\"\" id=\"send_text\">
  <button id=\"btn_send\" style=\"font-size: 20px;\">发送</button>
  <button id=\"btn_link\" style=\"font-size: 20px\">连接</button>
 </div>
 <div class=\"error_tip\" id=\"error_tip\" style=\"color: red;\">
 </div>
 <script>
  $(function(){
   //发送消息
   $(\'#btn_send\').click(function(){
    var send_text = $(\'#send_text\').val();
    if(send_text.length <= 0){
     $(\'#error_tip\').html(\'不能输入空值\');
    }else{
     send(send_text);
    }
   });
   //按回车键发送消息
   $(\'#send_text\').on(\'keyup\',function(e){
    if(e.keyCode == 13){
     $(\'#btn_send\').trigger(\'click\');
    }
   });
   //建立通讯链接
   $(\'#btn_link\').click(function(){
    connect();
    var _this = $(this);
    _this.attr(\'disabled\',true);
    _this.html(\'已连接\');
   });
  });
  //建立通讯连接函数
  function connect(){
   $(\'#content_box_title\').html($(\'#username\').val()+\'的消息窗口\');
   $.ajax({
    data:{\'user\':$(\'#username\').val()},
    url:\'ajaxPush.PHP\',
    type:\'get\',
    timeout:0,
    dataType:\'json\',
    success:function(data){
     $(\'#content_box\').append(\'<div class=\"require\">\'+data.msg+\'</div>\');
     connect();
    }
   });
  }
  //发送消息函数
  function send(massege){
   var user =$(\'#username\').val();
   $.getJSON(\'write.php\',{\'msg\':massege,\'user\':user},function(data){
    if(data.sf){
     $(\'#content_box\').append(\'<div class=\"send\">\'+massege+\'</div>\');
     $(\'#send_text\').val(\'\');
    }else{
     $(\'#error_tip\').html(\'输入保存错误!\');
    }
   });
  }
 </script>
</body>
</html>

ajax处理输入 write.php

<?php
/**
 * Created by TXM.
 * Time: 2017/4/18 13:13
 * function:
 */
$filename = dirname(__FILE__).\'/data.txt\';
$isread_file = dirname(__FILE__).\'/isread.txt\';
$user = dirname(__FILE__).\'/user.txt\';
//写入消息,消息未读,谁发送的消息
file_put_contents($filename,$_GET[\'msg\']);
file_put_contents($isread_file,\'0\');
file_put_contents($user,$_GET[\'user\']);
echo json_encode(array(\'sf\'=>true));

长轮询推送 ajaxPush.php

<?php
/**
 * Created by TXM.
 * Time: 2017/4/18 13:12
 * function:
 */
$filename = dirname(__FILE__).\'/data.txt\';
$isread_file = dirname(__FILE__).\'/isread.txt\';
$userfile = dirname(__FILE__).\'/user.txt\';
$get_user = $_GET[\'user\'] == \'1\'?\'2\':\'1\';
$msg=\'\';
while(1){
 $msg = file_get_contents($filename);
 $isread = file_get_contents($isread_file);
 $user = file_get_contents($userfile);
 //是对方发送的消息,设置消息已读,退出循环。
 if($isread == \'0\' && $get_user == $user){
  file_put_contents($isread_file,\'1\');
  break;
 }
 sleep(1);
}
echo json_encode(array(\'msg\'=>$msg));
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