Php 如何解决JSON错误：解析数据时出错[输入结束，字符0处]

我是这一级别编程的新手，希望学习JSON并了解其工作原理。我遇到了这个用户关于堆栈溢出的问题，想知道如何以及在哪里使用给他的答案

用户代码为：

    private ProgressDialog pDialog;

    JSONParser jsonParser = new JSONParser();
    EditText inputDriver;
    EditText inputLicence;
    EditText inputOfficer;
    EditText inputSpeed;
    EditText FineAppl;
    EditText inputCategory;
    TextView registerFine;

    // url to create new fine
    private static String url_create_fine = "http://192.168.1.1/android_api/create.php";

    // JSON Node names/
    private static final String TAG_SUCCESS = "success";

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

        speed = (EditText) findViewById(R.id.editText3);    
        Fine = (TextView)findViewById(R.id.editText4);  
        btnSelectDate=(Button)findViewById(R.id.buttonSelectDate);
        btnSelectTime=(Button)findViewById(R.id.buttonSelectTime);
        inputDriver = (EditText) findViewById(R.id.editText1);
        inputLicence = (EditText) findViewById(R.id.editText2);
        inputOfficer = (EditText) findViewById(R.id.editText5);
        inputSpeed = (EditText) findViewById(R.id.editText3);
        FineAppl = (EditText) findViewById(R.id.editText4);
        inputCategory = (EditText) findViewById(R.id.editText6);
        registerFine = (TextView) findViewById(R.id.fineregistered);


        // Create button
       Button btnRegisterfine = (Button) findViewById(R.id.savefine);

       class CreateNewFine extends AsyncTask<String, String, String> {


                            @Override
                            protected void onPreExecute() {
                                super.onPreExecute();
                                pDialog = new ProgressDialog(FineCalc.this);
                                pDialog.setMessage("Registering Fine..");
                                pDialog.setIndeterminate(false);
                                pDialog.setCancelable(true);
                                pDialog.show();
                            }


                            protected String doInBackground(String... args) {
                                String driver = inputDriver.getText().toString();
                                String licencenum = inputLicence.getText().toString();
                                String officer = inputOfficer.getText().toString();
                                String speed = inputSpeed.getText().toString();
                                String fine= FineAppl.getText().toString();
                                String category = inputCategory.getText().toString();


                                // Building Parameters
                                List<NameValuePair> params = new ArrayList<NameValuePair>();
                                params.add(new BasicNameValuePair("driver", driver));
                                params.add(new BasicNameValuePair("licencenum", licencenum));
                                params.add(new BasicNameValuePair("officer", officer));
                                params.add(new BasicNameValuePair("speed", speed));
                                params.add(new BasicNameValuePair("fine", fine));
                                params.add(new BasicNameValuePair("category", category));

                                // getting JSON Object
                                // Note that create product url accepts POST method
                                JSONObject json = jsonParser.makeHttpRequest(url_create_fine, "POST", params);



                                // check for success tag
                               try {

                                    if(json != null && !(json).isNull(TAG_SUCCESS)){
                                    //registerFine.setText("");
                                    String success = json.getString(TAG_SUCCESS);
                                    if(success != null && success.length() > 0){

                                        // successfully created product
                                       Intent i = new Intent(getApplicationContext(), UserLogin.class);
                                        startActivity(i);
                                        //registerFine.setText("Successful");


                                        // closing this screen

                                        finish();

                                    } 
                    else {
                                    }   // failed to create product
                                    }
                                } catch (JSONException e) {
                                    e.printStackTrace();
                                }

                                return null;
                            }



                            protected void onPostExecute(String file_url) {
                                // dismiss the dialog once done
                                pDialog.dismiss();
                            }

                        }  

有人给出的答案是实施以下步骤。那么，在上面的代码中，如何以及在何处实现以下内容呢

    HttpResponse response = client.execute(httpPost);
    String responseBody = EntityUtils.toString(response.getEntity());

     pass the string into json array and get the response value

        JSONArray jsArray = new JSONArray(responseBody);
        JSONObject js = jsArray.getJSONObject(0);
        String returnvalmsg = js.getString("message");
        String returnvalsucc = js.getString("success");

---

构造函数不会返回数据库连接，一旦拥有对象，就可以访问返回DB连接的方法：

require_once 'include/DB_Connect.php';
$db = new DB_Connect();
$conn = $db->connect();

$result = mysql_query("INSERT INTO fineregister(driver,licencenum,officer,speed,fine,category)
                       VALUES('$driver','$licencenum','$officer','$speed','$fine','$category')"
           , $conn);

---

提供有效：异常表示未完成此操作。（这些代码都不重要，但JSON没有显示出来。）伙计，这里不要问这个问题。在你提到的问题的评论中问这个问题。不幸的是，我还没有足够的声誉来发表评论，所以我想通过在自己的帖子上发表评论来学习。将不胜感激

     08-04 05:47:48.799: E/JSON Parser(1506): Error parsing data [End of input at character 0 of ]

    HttpResponse response = client.execute(httpPost);
    String responseBody = EntityUtils.toString(response.getEntity());

     pass the string into json array and get the response value

        JSONArray jsArray = new JSONArray(responseBody);
        JSONObject js = jsArray.getJSONObject(0);
        String returnvalmsg = js.getString("message");
        String returnvalsucc = js.getString("success");

require_once 'include/DB_Connect.php';
$db = new DB_Connect();
$conn = $db->connect();

$result = mysql_query("INSERT INTO fineregister(driver,licencenum,officer,speed,fine,category)
                       VALUES('$driver','$licencenum','$officer','$speed','$fine','$category')"
           , $conn);