php生成Android客户端扫描可登录的二维码，android客户端-php手册-php.cn

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php生成Android客户端扫描可登录的二维码，android客户端

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Jun 13, 2016 am 08:39 AM

android php QR code

php生成Android客户端扫描可登录的二维码，android客户端

本文实例为大家分享了php网页生成二维码，Android客户端扫描登录的具体代码，供大家参考，具体内容如下

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。

具体代码：
1. 通过随机数生成二维码图片，并执行轮询操作命令的主页面

<html>
 <head>
  <title>qrlogin</title>
  <meta charset="UTF-8"/>
 </head>
 <body>
  <&#63;php
  /**
   * @author Cenquanyu
   * @version 2016年5月12日
   *
   */
    require 'mysql_connect.php';
    $randnumber = "";
    for($i=0;$i<8;$i++){
    $randnumber.=rand(0,9);
    }
    //将生成的随机数保存至数据库
    mysql_query("insert into login_data (randnumber) values ('$randnumber')")
     
  &#63;>
    
  <img  src="http://qr.liantu.com/api.php&#63;text=<&#63;php echo $randnumber;&#63; alt="php生成Android客户端扫描可登录的二维码，android客户端" >" width="300px"/>
  <input hidden="hidden" type="text" name="randnumber" id="randnumber"value="<&#63;php echo $randnumber;&#63;>"/>
  
 </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='welcome.php';
  }
}
}
 }
 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('randnumber').value;
    xmlHttpRequest.open("GET","polling.php&#63;randnumber="+ randnumber,true);
    xmlHttpRequest.send();
 }
    setInterval("polling()",1000);
</script>
  
</html>

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2. 数据库连接页面

<&#63;php
/**
 * 数据库连接文件
 * @author Cenquanyu
 * @version 2016年5月12日
 * 
 */
$con = mysql_connect("localhost","root","") or die(mysql_error());
mysql_select_db("qr_login");
  
&#63;>

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3.执行轮询操作的页面，username不为空则跳转

<&#63;php
/**
 * @author Cenquanyu
 * @version 2016年5月12日
 * 执行轮询操作，查询随机数在数据库中的相应位置的username字段为不为空
 * 为空，则返回false,页面不跳转
 * 不为空，则说明有用户进行了该二维码的扫码登录，页面进行跳转
 */
require 'mysql_connect.php';
$randnumber = $_GET['randnumber'];
$result = mysql_query("select * from login_data where randnumber='$randnumber'");
$row = mysql_fetch_array($result);
if($row['username']!="")
  echo "true";
else
  echo "false";
&#63;>

Copy after login

4.自定义的API，对客户端的username进行保存

<&#63;php
/**
 * @author Cenquanyu
 * @version 2016年5月12日
 * 自定义API用于Android客户端扫码登录，将客户端的username保存至二维码对应的随机数在数据库中的相应位置。
 * 参数：username，randnumber
 * 无返回值
 */
$randnumber = $_GET('randnumber');
$username = $_GET('username');
  
require 'mysql_connect.php';
mysql_query("update qr_login set username='$username' where randnumber= '$randnumber'");
  
  
&#63;>

Copy after login

5. Android客户端执行扫码操作的Activity

package com.Cenquanyu.qrlogin;
  
import com.Cenquanyu.qrlogin.R;
import com.zxing.activity.CaptureActivity;
  
import android.app.Activity;
import android.content.Intent;
import android.graphics.Paint.Cap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
/**
 * @author Cenquanyu
 * @version 2016年5月12日
 * 
 */
public class MainActivity extends Activity implements OnClickListener {
  
  private Button btnScan;
  private EditText etUsername;
  
    
  private static final String WEB_URL = "http://172.31.19.202/QRLogin/";//改成PC端相应地址
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  
    btnScan = (Button) findViewById(R.id.btnScan);
    btnScan.setOnClickListener(this);
    etUsername = (EditText) findViewById(R.id.etUsername);
  }
  
  @Override
  public void onClick(View v) {
    // 扫码操作
    Intent intent = new Intent(this, CaptureActivity.class);
    startActivityForResult(intent, 0);//返回结果
  }
  
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK) {
      String randnumber = data.getExtras().getString("result");//客户端扫码后返回扫描结果，将二维码对应的随机数取出
      String username = etUsername.getText().toString();
      String url = WEB_URL + "saveUsername.php&#63;randnumber=" + randnumber
          + "&username=" + username;
      HttpUtils.login(url);//访问url
    }
  }
  
}

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6. 网络请求类

package com.Cenquanyu.qrlogin;
  
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
  
public class HttpUtils{
  public static void login(final String url){
    new Thread(new Runnable() {
      @Override
      public void run() {
        HttpURLConnection connection;
        try {
          connection = (HttpURLConnection) new URL(url).openConnection();
          connection.setRequestMethod("GET");
          connection.getInputStream();
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    }).start();
  }
}

Copy after login

以上就是本文的全部内容，希望对大家的学习有所帮助。

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