尝试建立本地连接时出错

Question

我试图用以下代码建立本地连接，但由于错误而逐渐弹出。

MainActivity.java

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    GetJsonArray obj = new GetJsonArray();
    obj.readJson(this);
}

}

GetJsonArray.java

public class GetJsonArray
{
    private String SERVER_URL="http://myIPAddress:portNumber/database_name/table_name.jsp";
    private Context context;

    public void readJson(final Context context)
    {
        this.context=context;

        Toast.makeText(context,"Inside JSON Array class",Toast.LENGTH_LONG).show();

        RequestQueue queue = Volley.newRequestQueue(context);
        StringRequest stringRequest = new StringRequest(Request.Method.GET, SERVER_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response)
                    {
                        if(response.trim().equals("success"))
                        {
                            Toast.makeText(context,"Data recieved from server",Toast.LENGTH_LONG).show();
                            //Log.e("Success",response);
                        }
                    }
                },
              new Response.ErrorListener()
              {
            @Override
            public void onErrorResponse(VolleyError error)
            {
                Toast.makeText(context,"Data not recieved from server",Toast.LENGTH_LONG).show();
                //Log.e("Error",error.getLocalizedMessage());
            }
        }){};
        queue.add(stringRequest);
    }

}

错误 E / LB：无法打开文件：没有这样的文件或目录