使用AsyncTask的FileNotFoundException

Question

我刚接触Android Studio，我想将Android Studio连接到另一个编译器创建的数据库。当我执行调试器并到达de line＆＃34; BufferedReader bf = new BufferedReader（new InputStreamReader（conn.getInputStream（）））;＆＃34;时，我得到和Exception调用＆＃34; FileNotFoundException＆＃34;。< / p>

有人可以帮助我吗？

非常感谢。

公共类Menu_Login扩展了AppCompatActivity {

EditText usuario, password;
Button login;
String url_login;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.menu_login);
    usuario = (EditText) findViewById(R.id.escribir_nombre); // COMO DECLARAR UN EDIT TEXT
    password = (EditText) findViewById(R.id.escribir_contraseña);
    login = (Button) findViewById(R.id.click_boton);
    final Context context = this;
    login.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v)
        {
            String user = usuario.getText().toString();
            String pass = password.getText().toString();
            url_login = String.format("http://192.168.1.35/loguear?nombre=%s&password=%s",user,pass);
            new MultiplyTask(context).execute(user);

        }
    });
}
public class MultiplyTask extends AsyncTask <String,Void,String>
{
    Context context;
    private MultiplyTask(Context context) {
        this.context = context;
    }

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

    @Override
    protected void onPostExecute(String value) {
        TextView n = (TextView) findViewById (R.id.mostrar_resultado);
        n.setText(value);
    }

    @Override
    protected String doInBackground(String... params) {
        try
        {
            URL url = new URL(url_login);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(10000 );
            conn.setConnectTimeout(15000);
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            conn.connect();
            BufferedReader bf = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            int status = conn.getResponseCode();
            InputStream error = conn.getErrorStream();
            String value = bf.readLine();
            return value;
        }
        catch (Exception e)
        {
            System.out.println(e);
            e.printStackTrace();

        }
        return null;
    }
}
}