java - 错误解析数据 org.json.jsonexception end of input at character 0

Question

我一整天都在查看我的代码，但找不到发生这种情况的原因(或者为什么它实际上没有从它应该返回的 MySQL 服务器返回结果。希望一双新的眼睛能找到原因。

Jsonparser 类

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    // function get json from url
    // by making HTTP POST or GET method
    public JSONObject makeHttpRequest(String url, String method,
            List<NameValuePair> params) {

        // Making HTTP request
        try {

            // check for request method
            if(method == "POST"){
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();

            }else if(method == "GET"){
                // request method is GET
                DefaultHttpClient httpClient = new DefaultHttpClient();
                String paramString = URLEncodedUtils.format(params, "utf-8");
                url += "?" + paramString;
                HttpGet httpGet = new HttpGet(url);

                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }           


        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}

我 Activity 中的内部类

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

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(LogIn.this);
            pDialog.setMessage("Loading User details. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        /**
         * Getting product details in background thread
         * */
        protected String doInBackground(String... params) {

                        // Building Parameters
                        List<NameValuePair> param = new ArrayList<NameValuePair>();
                        param.add(new BasicNameValuePair("email", EMAIL));
                        param.add(new BasicNameValuePair("password", PASSWORD));

                        // getting product details by making HTTP request
                        // Note that product details url will use GET request
                        JSONObject jsonuser = jsonParser.makeHttpRequest(
                                url_user_detials, "GET", param);

                        // check your log for json response
                        Log.d("User Details", jsonuser.toString());

                        // json success tag
                    try {
                        int success = jsonuser.getInt(TAG_SUCCESS);
                        if (success == 1) {
                            // successfully received product details
                            JSONArray productObj = jsonuser
                                    .getJSONArray("product"); // JSON Array

                            // get first product object from JSON Array
                            JSONObject product = productObj.getJSONObject(0);

                            SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
                            SharedPreferences.Editor editor = settings.edit();

                            editor.putInt("USERID", (Integer) product.get("ProfileID")); 
                            editor.commit();
                            Intent intent = new Intent(LogIn.this, MyLists.class);
                            LogIn.this.startActivity(intent);
                            finish();
                        }else{
                            // product with pid not found
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

            return null;
        }


        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once got all details
            pDialog.dismiss();
        }
    }

最后是服务器上的 PHP 脚本与数据库对话

    <?php

/*
 * Following code will get single product details
 * A product is identified by product id (pid)
 */

// array for JSON response
$response = array();


// include db connect class
require_once __DIR__ . '/db_connect.php';

// connecting to db
$db = new DB_CONNECT();

// check for post data
if (isset($_GET['email'] && isset($_GET['password')) {
    $email = $_GET['email'];
    $password = $_GET['password'];

    // get a product from products table
    $result = mysql_query("SELECT * FROM profiles_profiles WHERE ProfileEmail = '$email' AND ProfilePassword = '$password'");

    if (!empty($result)) {
        // check for empty result
        if (mysql_num_rows($result) > 0) {

            $result = mysql_fetch_array($result);

            $product = array();
            $product["ProfileID"] = $result["ProfileID"];
            // success
            $response["success"] = 1;

            // user node
            $response["product"] = array();

            array_push($response["product"], $product);

            // echoing JSON response
            echo json_encode($response);
        } else {
            // no product found
            $response["success"] = 0;
            $response["message"] = "No user found";

            // echo no users JSON
            echo json_encode($response);
        }
    } else {
        // no product found
        $response["success"] = 0;
        $response["message"] = "No user found";

        // echo no users JSON
        echo json_encode($response);
    }
} else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";

    // echoing JSON response
    echo json_encode($response);
}
?>

以及我得到的实际错误的堆栈跟踪

08-18 18:43:55.573: E/JSON Parser(16008): Error parsing data org.json.JSONException: End of input at character 0 of 
08-18 18:43:55.573: W/dalvikvm(16008): threadid=13: thread exiting with uncaught exception (group=0x41515450)
08-18 18:43:55.584: E/AndroidRuntime(16008): FATAL EXCEPTION: AsyncTask #1
08-18 18:43:55.584: E/AndroidRuntime(16008): java.lang.RuntimeException: An error occured while executing doInBackground()
08-18 18:43:55.584: E/AndroidRuntime(16008):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.lang.Thread.run(Thread.java:856)
08-18 18:43:55.584: E/AndroidRuntime(16008): Caused by: java.lang.NullPointerException
08-18 18:43:55.584: E/AndroidRuntime(16008):    at com.test.app.LogIn$GetUserDetails.doInBackground(LogIn.java:149)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at com.test.app.LogIn$GetUserDetails.doInBackground(LogIn.java:1)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-18 18:43:55.584: E/AndroidRuntime(16008):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-18 18:43:55.584: E/AndroidRuntime(16008):    ... 5 more

PHP 错误

PHP Parse error:  syntax error, unexpected T_BOOLEAN_AND, expecting ',' or ')' in /home/sites/pmclient.co.uk/public_html/dadgapp/get_user_details.php on line 19

Answer 1

你忘了“;”在:

$password = $_GET['password']

PHP 代码中的行。