php生成Android客户端扫描可登录的二维码，android客户端
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。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
