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The PHP web page generates a QR code, and the Android client scans the code to log in.

大家讲道理

Nov 08, 2016 am 11:41 AM

使用了Github上具有扫码功能的ZXing开源库，使用了通过随机数生成二维码图片网络API，整个过程经过三步：
1.PHP网页生成二维码，相应随机数存储到数据库中；
2.Android客户端扫码，携带username保存至随机数对应的位置；

3.每隔一段时间，PHP通过Ajax轮询数据库，判断是否为空，不为空则跳转网页。

<html>
  <head>
    <title>qrlogin</title>
    <meta charset="UTF-8"/>
  </head>
  <body>
    <?php
    /**
     * @author Cenquanyu
     * @version 2016年5月12日
     *
     */
       require &#39;mysql_connect.php&#39;;
       $randnumber = "";
       for($i=0;$i<8;$i++){
       $randnumber.=rand(0,9);
       }
       //将生成的随机数保存至数据库
       mysql_query("insert into login_data (randnumber) values (&#39;$randnumber&#39;)")
        
    ?>
     
   <img  src="/static/imghw/default1.png"  data-src="http://qr.liantu.com/api.php?text=<?php echo $randnumber;? alt="The PHP web page generates a QR code, and the Android client scans the code to log in." >"  class="lazy"   width="300px"/>
   <input hidden="hidden" type="text" name="randnumber" id="randnumber"value="<?php echo $randnumber;?>"/>
  
  </body>
  <script>
    xmlHttpRequest.onreadystatechange = function(){
       if(xmlHttpRequest.status == 200 && xmlHttpRequest.readyState ==4){
    result = xmlHttp.responseText;
    if(result==true){//username不为空则跳转页面
         window.location.href=&#39;welcome.php&#39;;
    }
}
}
  }
  function polling(){
 
      //执行轮询操作
      var xmlHttpRequest;
      if(window.XMLHttpRequest){
          xmlHttpRequest = new XMLHttpRequest();
          }
      else{
          xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
      }
       randnumber = document.getElementById(&#39;randnumber&#39;).value;
       xmlHttpRequest.open("GET","polling.php?randnumber="+ randnumber,true);
       xmlHttpRequest.send();
  }
       setInterval("polling()",1000);
</script>
 
</html>

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