问基于PHP站点的Android应用程序

EN

URL url = new URL(link);
String data  = URLEncoder.encode("username", "UTF-8") 
+ "=" + URLEncoder.encode(username, "UTF-8");
data += "&" + URLEncoder.encode("password", "UTF-8") 
+ "=" + URLEncoder.encode(password, "UTF-8");
URLConnection conn = url.openConnection(); 

OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream()); 
wr.write( data ); 
BufferedReader reader = new BufferedReader(new 
InputStreamReader(conn.getInputStream()));

$con=mysqli_connect("example.com","username","password","database name");

if (mysqli_connect_errno($con))
{
   echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$username = $_GET['username'];
$password = $_GET['password'];

$result = mysqli_query($con,"SELECT Role FROM table1 where Username='$username' and Password='$password'");

$row = mysqli_fetch_array($result);
$data = $row[0];

if($data){
echo $data;
}

mysqli_close($con);