無法使用WAMP作為本地服務器將Android應用程序連接到MySQL數據庫

Question

我正在嘗試創建一個簡單的登錄到我的Android應用程序，以按照以下教程將用戶輸入與數據庫數據進行比較：

• http://androidcss.com/android/test-android-app-php-localhost-wamp/
• http://androidcss.com/android/android-php-mysql-login-tutorial/

我將WAMP用作本地服務器只是為了測試是否可以建立連接。 我在以下目錄中放置了兩個名為config.inc.php和login.inc.php的 PHP文件： C：\\ wamp64 \\ www \\ DUFT ，它們看起來像這樣：

config.inc.php文件

<?php $servername = "localhost:80"; 
  $username = "root";
  $password = "root";
  $dbname = "duft";

  try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
    die("OOPs something went wrong");
}

?>

login.inc.php

<?php

 include 'config.inc.php';

 // Check whether username or password is set from android  
 if(isset($_POST['username']) && isset($_POST['password']))
 {
      // Innitialize Variable
      $result='';
      $username = $_POST['username'];
      $password = $_POST['password'];

      // Query database for row exist or not
      $sql = 'SELECT * FROM tbl_login WHERE  email = :username AND adgangskode = :password';
      $stmt = $conn->prepare($sql);
      $stmt->bindParam(':username', $username, PDO::PARAM_STR);
      $stmt->bindParam(':password', $password, PDO::PARAM_STR);
      $stmt->execute();
      if($stmt->rowCount())
      {
         $result="true";    
      }  
      elseif(!$stmt->rowCount())
      {
            $result="false";
      }

      // send result back to android
      echo $result;
}?>

然后，有了LoginActivity類，在其中使用AsyncTask在后台建立與數據庫的連接。 在onPostExecute（）方法中，如果用戶輸入匹配數據庫中的內容，則嘗試啟動新活動。 但是我一直從PHP文件中收到此錯誤：

Call Stack#TimeMemoryFunctionLocation10.0042244400{main}( )...\\login.inc.php : 020.0043245592http://www.php.net/PDO.construct' target='_new'>__construct( )...\\login.inc.php : 10( ! ) Warning: PDO::__construct(): Error while reading greeting packet. （！）警告：PDO :: __ construct（）：MySQL服務器已在第行的C：\\ wamp64 \\ www \\ DUFT \\ login.inc.php中消失，調用Stack＃TimeMemoryFunctionLocation10.0042244400 {main}（）... \\ login.inc.php ： 020.0043245592http：//www.php.net/PDO.construct'target ='_ new'> __ construct（）... \\ login.inc.php ： 10（！）警告：PDO :: __ construct （）：讀取問候數據包時出錯。 Call Stack#TimeMemoryFunctionLocation10.0042244400{main}( )...\\login.inc.php : 020.0043245592http://www.php.net/PDO.construct' target='_new'>__construct( )...\\login.inc.php : 10OOPs something went wrong 第行的C：\\ wamp64 \\ www \\ DUFT \\ login.inc.php中的PID = 9636調用Stack＃TimeMemoryFunctionLocation10.0042244400 {main}（）... \\ login.inc.php ： 020.0043245592http：//www.php .net / PDO.construct'target ='_ new'> __ construct（）... \\ login.inc.php ： 10糟糕

這就是我的logcat所說的：

我的LoginActivity Java類如下所示：

public class LoginActivity extends AppCompatActivity{

//NYT
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds

public static final int CONNECTION_TIMEOUT=2000000000;
public static final int READ_TIMEOUT=2000000000;
private EditText etEmail;
private EditText etPassword;
//NYT

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    //NYT
    // Get Reference to variables
    etEmail = (EditText) findViewById(R.id.eMail);
    etPassword = (EditText) findViewById(R.id.password);
    //NYT


    TextView klikHer = (TextView) findViewById(R.id.klikHer);
    klikHer.setPaintFlags(klikHer.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);

    Button login = (Button) findViewById(R.id.signIn);
    login.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            //Intent intent = new Intent(LoginActivity.this, MenuScreen.class);
            //startActivity(intent);

            //NYT
            // Get text from email and passord field
            final String email = etEmail.getText().toString();
            final String password = etPassword.getText().toString();

            // Initialize  AsyncLogin() class with email and password
            new AsyncLogin().execute(email, password);
            //NYT
        }
    });
}


private class AsyncLogin extends AsyncTask<String, String, String> {
    ProgressDialog pdLoading = new ProgressDialog(LoginActivity.this);
    HttpURLConnection conn;
    URL url = null;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        //this method will be running on UI thread
        pdLoading.setMessage("\tLoading...");
        pdLoading.setCancelable(false);
        pdLoading.show();

    }

    @Override
    protected String doInBackground(String... params) {
        try {

            // Enter URL address where your php file resides
            url = new URL("http://192.168.87.100/DUFT/login.inc.php");

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return "exception";
        }
        try {
            // Setup HttpURLConnection class to send and receive data from php and mysql
            conn = (HttpURLConnection) url.openConnection();
            //conn.setReadTimeout(READ_TIMEOUT);
            //conn.setConnectTimeout(CONNECTION_TIMEOUT);
            conn.setRequestMethod("POST");

            // setDoInput and setDoOutput method depict handling of both send and receive
            conn.setDoInput(true);
            conn.setDoOutput(true);

            // Append parameters to URL
            Uri.Builder builder = new Uri.Builder()
                    .appendQueryParameter("username", params[0])
                    .appendQueryParameter("password", params[1]);
            String query = builder.build().getEncodedQuery();

            // Open connection for sending data
            OutputStream os = conn.getOutputStream();
            BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(os, "UTF-8"));
            writer.write(query);
            writer.flush();
            writer.close();
            os.close();
            conn.connect();

        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return "exception";
        }

        try {

            int response_code = conn.getResponseCode();

            // Check if successful connection made
            if (response_code == HttpURLConnection.HTTP_OK) {

                // Read data sent from server
                InputStream input = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                StringBuilder result = new StringBuilder();
                String line;

                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                // Pass data to onPostExecute method
                return (result.toString());

            } else {

                return ("unsuccessful");
            }

        } catch (IOException e) {
            e.printStackTrace();
            return "exception";
        } finally {
            conn.disconnect();
        }


    }

    @Override
    protected void onPostExecute(String result) {

        //this method will be running on UI thread

        pdLoading.dismiss();

        if (result.equalsIgnoreCase("true")) {
            /* Here launching another activity when login successful. If you persist login state
            use sharedPreferences of Android. and logout button to clear sharedPreferences.
             */

            Intent intent = new Intent(LoginActivity.this, MenuScreen.class);
            startActivity(intent);
            LoginActivity.this.finish();

        } else if (result.equalsIgnoreCase("false")) {

            // If username and password does not match display a error message
            //Toast.makeText(LoginActivity.this, "Invalid email or password", Toast.LENGTH_LONG).Show();


        } else if (result.equalsIgnoreCase("exception") || result.equalsIgnoreCase("unsuccessful")) {

            //Toast.makeText(LoginActivity.this, "OOPs! Something went wrong. Connection Problem.", Toast.LENGTH_LONG).Show();

        }
    }
}}

我已經按照教程中的所有步驟進行操作，並且可以通過在移動瀏覽器中輸入IPv4地址來使用手機訪問本地服務器。 這必須表示我也能夠訪問此本地服務器上的數據庫，對嗎？

Answer 1

我找到了解決方案！ 問題出在這行代碼中

php $servername = "localhost:80"; 

在這里，我為Apache而不是MySQL定義了端口3307。因此，我將其更改為正確的端口3307 ：）

謝謝您的幫助！