Comment valider les identifiants de connexion de l'utilisateur dans Android en utilisant PHP, MySql avec l'aide de json

J'ai fait ce code pour mon projet. et ça marche bien. Essayez-le.

Login2.php

<?php
$un=$_POST['username'];
$pw=$_POST['password'];
//connect to the db

$host="localhost"; // Host name 
$user="root"; // Mysql username 
$pswd=""; // Mysql password 
$db="database_name"; // Database name 
$tbl_name="user_info"; // Table name

$conn = mysql_connect($host, $user, $pswd);
mysql_select_db($db, $conn);
//run the query to search for the username and password the match
//$query = "SELECT * FROM $tbl_name WHERE first_name = '$un' AND password = '$pw'";
$query = "SELECT emp_id FROM $tbl_name WHERE first_name = '$un' AND password = '$pw'";
$result = mysql_query($query) or die("Unable to verify user because : " . mysql_error());
//this is where the actual verification happens
if(mysql_num_rows($result) > 0)
echo mysql_result($result,0);  // for correct login response
else
echo 0; // for incorrect login response
?>

Code Java pour Androidlogin.java

prenez deux edittext et un bouton et cliquez sur le bouton pour mettre ce code.supprimez la méthode saveperference si vous ne voulez pas enregistrer le nom d'utilisateur, emp_id dans l'ensemble de l'application.

    @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub

                    ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
                    postParameters.add(new BasicNameValuePair("username", username
                            .getText().toString()));
                    postParameters.add(new BasicNameValuePair("password", password
                            .getText().toString()));
                    // String valid = "1";
                    String response = null;
                    try {
                        // "http://10.0.2.2//Mobile/login2.php"
                        response = CustomHttpClient
                                .executeHttpPost(
                                        "http://10.0.2.2//Mobile/login2.php",
                                        postParameters);
// now in result you will have the response from php file either 0 or 1.                        
result = response.toString();
                        // res = res.trim();
                        result = result.replaceAll("\\s+", "");
                        // error.setText(res);

                        if (!result.equals("0")) {
                            SavePreferences("name", "pass", "emp_id", username
                                    .getText().toString(), password.getText()
                                    .toString());
                            Intent in = new Intent(Login.this, MainScreen.class);

                            // LoadPreferences();
                            error.setText("");

                            startActivity(in);
                        }

                        else
                            error.setText("Incorrect Username or Password");

                    } catch (Exception e) {
                        // un.setText(e.toString());
                    }

                }

CustomHttpClient.java

public class CustomHttpClient {
    /** The time it takes for our client to timeout */
    public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds

    /** Single instance of our HttpClient */
    private static HttpClient mHttpClient;

    /**
     * Get our single instance of our HttpClient object.
     *
     * @return an HttpClient object with connection parameters set
     */
    private static HttpClient getHttpClient() {
        if (mHttpClient == null) {
            mHttpClient = new DefaultHttpClient();
            final HttpParams params = mHttpClient.getParams();
            HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT);
            HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT);
            ConnManagerParams.setTimeout(params, HTTP_TIMEOUT);
        }
        return mHttpClient;
    }

    /**
     * Performs an HTTP Post request to the specified url with the
     * specified parameters.
     *
     * @param url The web address to post the request to
     * @param postParameters The parameters to send via the request
     * @return The result of the request
     * @throws Exception
     */
    public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception {
        BufferedReader in = null;
        try {
            HttpClient client = getHttpClient();
            HttpPost request = new HttpPost(url);
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
            request.setEntity(formEntity);
            HttpResponse response = client.execute(request);
            in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

            StringBuffer sb = new StringBuffer("");
            String line = "";
            String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
            }
            in.close();

            String result = sb.toString();
            return result;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * Performs an HTTP GET request to the specified url.
     *
     * @param url The web address to post the request to
     * @return The result of the request
     * @throws Exception
     */
    public static String executeHttpGet(String url) throws Exception {
        BufferedReader in = null;
        try {
            HttpClient client = getHttpClient();
            HttpGet request = new HttpGet();
            request.setURI(new URI(url));
            HttpResponse response = client.execute(request);
            in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

            StringBuffer sb = new StringBuffer("");
            String line = "";
            String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
            }
            in.close();

            String result = sb.toString();
            return result;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}