使用带有 php 页面的 Android 在 MySQL 中添加数据

Question

我想从 Android 应用程序发送 PHP 页面上的数据，并将 PHP 页面存储数据存储在 My SQL 中。 当我将数据发送到 PHP 并存储数据库时。 android 应用程序成功向 php 页面发送请求，并将数据存储在数据库中。但是在 Android 应用程序中输入的值不能存储在数据库中。
PHP 代码

$user_name = $_POST['user_name'];
$user_mail = $_POST['email'];
$user_pass = $_POST['password'];
$user_ip = getRealIpAddr();

$sql = "INSERT INTO users (username, email, password, ip_add, created_at) VALUES ('$user_name', '$user_mail', '$user_pass', '$user_ip',Now())";

if ($con->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

和 Android XML 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="User Name"
        android:inputType="text"
        android:layout_gravity="center"
        tools:layout_editor_absoluteX="16dp"
        tools:layout_editor_absoluteY="38dp" />

    <EditText
        android:id="@+id/email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Enter Email"
        android:inputType="textEmailAddress"
        android:layout_gravity="center"
        tools:layout_editor_absoluteX="16dp"
        tools:layout_editor_absoluteY="94dp" />

    <EditText
        android:id="@+id/password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Enter Password"
        android:inputType="textPassword"
        android:layout_gravity="center"
        tools:layout_editor_absoluteX="16dp"
        tools:layout_editor_absoluteY="160dp" />

    <Button
        android:id="@+id/signup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sign Up"
        android:background="@color/colorPrimary"
        android:textColor="#fff"
        android:layout_gravity="center"
        tools:layout_editor_absoluteX="60dp"
        tools:layout_editor_absoluteY="217dp"
        android:onClick="onsignup"/>
</LinearLayout>

这里是Java代码

username = (EditText)findViewById(R.id.username);
        email = (EditText)findViewById(R.id.email);
        password = (EditText)findViewById(R.id.password);
    }

    public void onsignup(View view){
        String user = username.getText().toString();
        String mail = email.getText().toString();
        String pass = password.getText().toString();
        String type = "signup";

        BackgroundWorker backgroundWorker = new BackgroundWorker(this);
        backgroundWorker.execute(type,user,mail,pass);
    }

BackgroundWorker 类代码在这里

public class BackgroundWorker extends AsyncTask<String,Void,String> {
    Context context;
    AlertDialog alertDialog;
    BackgroundWorker(Context ctx){
        context = ctx;
    }

    @Override
    protected String doInBackground(String... params){
        String type = params[0];
        String signup_url = "http://192.168.0.104/android/signup.php";
        if (type.equals("signup")) {
            try {
                String user_name = params[1];
                String email = params[2];
                String password = params[3];

                URL url = new URL(signup_url);

                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);

                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));

                String post_data = URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode(user_name,"UTF-8")+"&"+URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&"+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");

                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();

                InputStream inputStream = httpURLConnection.getInputStream();

                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));

                String result = "";
                String line = "";

                while ((line = bufferedReader.readLine())!= null){
                    result+=line;

                }
                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                return result;

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    @Override
    protected void onPreExecute() {
        alertDialog = new AlertDialog.Builder(context).create();
        alertDialog.setTitle("Signup Status");
    }


    @Override
    protected void onPostExecute(String user_name) {
        alertDialog.setMessage(user_name);
        alertDialog.show();
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }
}

这是编码的所有文件我也有清单文件的权限 但我不知道问题到底出在哪里。 感谢您的帮助

Answer 1

此代码 100% 正常工作，并将数据保存到 MySQL 数据库只是我的网站产生的 URL 页面错误

String signup_url = "http://192.168.0.104/android/signup.php";

那是 signu.php 文件名错误，这就是我遇到这个问题的原因