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>
<?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')")
?>
<img src="http://qr.liantu.com/api.php?text=<?php echo $randnumber;? 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="<?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='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?randnumber="+ randnumber,true);
xmlHttpRequest.send();
}
setInterval("polling()",1000);
</script>
</html>
2. 数据库连接页面
<?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");
?>
3.执行轮询操作的页面，username不为空则跳转
<?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";
?>
4.自定义的API，对客户端的username进行保存
<?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'");
?>
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?randnumber=" + randnumber
+ "&username=" + username;
HttpUtils.login(url);//访问url
}
}
}
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();
}
}
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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