php - 从服务器发送字符串响应时，java.lang.Integer 无法转换为 JSONObject

Question

我正在通过 genAsync 库从 Android 应用程序向服务器发送数据。在服务器上，我正在插入并检查用户是否同时存在。如果用户已经存在，则我发送 json_encoded 数组，如果用户不存在，则我发送 消息，即用户插入成功，但当我发送时给应用程序的消息它给出了一个错误，即 java.lang.Integer cannot be converted to JSONObject

我还附上了 php 代码、android 代码和错误日志。

php代码

class Users extends CI_Controller
{

  public function create(){

    $data=$this->check_exist($this->input->post('user_id'));
    if($data=='0')
    {

        $this->load->model('UsersModel');
        $msg = $this->UsersModel->create();
        if ($msg==true) {
            echo 'user inserted successfully';
        } else {
            echo '0';
        }
    }
    else{
        $data["user_details"]=$data;
        echo json_encode($data);
    }
  }
  public function check_exist($user_id)
    {
      $this->load->helper('url');
      $this->load->model('UsersModel');
      $data=$this->UsersModel->user_exist($user_id);
      if(!empty($data))
      {
        return($data);
      }
      else
      {
        return '0';
      }
   }
}

向服务器端发送数据的android代码

try {
           final Database_Helper dg = new Database_Helper(getBaseContext());
           ServerUrl obj =new ServerUrl();
           HashMap postData = new HashMap();
           postData.put("user_id",personId);
           postData.put("user_name",personName);
           postData.put("email",personEmail);              
           postData.put("profile_picture",String.valueOf(personPhoto));
           final PostResponseAsyncTask readTask = new PostResponseAsyncTask(UserLogin.this, postData, new AsyncResponse() 
              {

                public void processFinish(String mStringArray) 
                  {
                     Log.w("data", mStringArray.toString());
                     try {
                           JSONObject json= null;
                           json = new JSONObject(mStringArray);
                           JSONArray jsonscoresarray=json.getJSONArray("user_details");
                           final JSONObject details = jsonscoresarray.getJSONObject(0);
                          if (jsonscoresarray.length() == 0) 
                          {
                            //storing data to sqlite if user not exist
                            dg.user_Putrecord(dg, personId, personName, personEmail, String.valueOf(personPhoto));
                          }
                          else
                          {
                             //storing data to sqlite if user exist
          dg.user_Putrecord(dg,details.getString("auth_id"),details.getString("full_name"),details.getString("email_id"),details.getString("profile_url"));
                                        }
                                    } catch (JSONException e) {
                                        e.printStackTrace();
                                    }
                                    Toast.makeText(UserLogin.this, mStringArray.toString(), Toast.LENGTH_LONG).show();
                                }

                            });
                            obj.url("Users","create");
                            readTask.execute(obj.domain_url);
                        }
                        catch (Exception ex)
                        {
                         Toast.makeText(UserLogin.this, ex.getMessage().toString(), Toast.LENGTH_SHORT).show();
                        }

这是我的错误日志

01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err: org.json.JSONException: Value 1 of type java.lang.Integer cannot be converted to JSONObject
01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err:     at org.json.JSON.typeMismatch(JSON.java:111)
01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:160)
01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:173)
01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err:     at com.example.ali.ansofexperts.UserLogin$4$1.processFinish(UserLogin.java:121)
01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err:     at com.kosalgeek.asynctask.PostResponseAsyncTask.onPostExecute(PostResponseAsyncTask.java:248)
01-29 13:49:33.765 4455-4455/com.example.ali.ansofexperts W/System.err:     at com.kosalgeek.asynctask.PostResponseAsyncTask.onPostExecute(PostResponseAsyncTask.java:31)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at android.os.AsyncTask.finish(AsyncTask.java:667)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at android.os.AsyncTask.-wrap1(AsyncTask.java)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:684)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at android.os.Looper.loop(Looper.java:154)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6121)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
01-29 13:49:33.766 4455-4455/com.example.ali.ansofexperts W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

我只想知道当从服务器发送字符串响应时如何处理这个异常。

Answer 1

我正在为初学者发布完整的答案。

我在下面编写时，您的 php 代码略有变化

public function create(){
    $this->load->model('UsersModel');
    $data=$this->UsersModel->check_exist($this->input->post('user_id'));
    if($data==0){
        $nData=$this->UsersModel->create();
        if($nData!="0"){
        $data=$this->UsersModel->check_exist($this->input->post('user_id'));
            echo json_encode($data);        
        }else{
            die("0");
        }

    }else{
            $result["user_details"]=$data;
            echo json_encode($result);
    }

}

如您所见，我刚刚从 Controller 中删除了您的 check_exist 函数。因为您的 Controller 中不需要此功能。

所以我直接从模型中调用它，以减少代码行数。

现在android端编码发生变化

   try {
          final Database_Helper dg = new Database_Helper(getBaseContext());
             ServerUrl obj =new ServerUrl();
             HashMap postData = new HashMap();
             postData.put("user_id",personId);
             postData.put("user_name",personName);
             postData.put("email",personEmail);

             postData.put("profile_picture",String.valueOf(personPhoto));
             final PostResponseAsyncTask readTask = new PostResponseAsyncTask(UserLogin.this, postData, new AsyncResponse() 
              {               
               public void processFinish(String mStringArray) 
               {
                 Log.d("data", mStringArray);
                 if(mStringArray.equals("0"))
                 {
                  Toast.makeText(UserLogin.this, "Invalid login try again", Toast.LENGTH_LONG).show();

                 }
                 else 
                 {
                 try {
                      JSONObject json = null;
                      json = new JSONObject(mStringArray);
                      JSONArray jsonscoresarray = json.getJSONArray("user_details");
                       final JSONObject details = jsonscoresarray.getJSONObject(0);
                       if (mStringArray.equals("0")) 
                       {                      
                         Toast.makeText(UserLogin.this, "At if", Toast.LENGTH_LONG).show();
                       } 
                       else 
                       {                      
                        Toast.makeText(UserLogin.this, "At else", Toast.LENGTH_LONG).show();
                      }
                      Toast.makeText(UserLogin.this, "Login Success", Toast.LENGTH_LONG).show();

                    } 
                 catch (JSONException e)
                 {
                       e.printStackTrace();
                 }
              }

           }

        });
       obj.url("Users","create");
       readTask.execute(obj.domain_url);
    }
    catch (Exception ex)
    {
      Toast.makeText(UserLogin.this, ex.getMessage().toString(), Toast.LENGTH_SHORT).show();
    }

希望对您有所帮助。