獲取JSON錯誤：輸入端在字符0

PHP文件：獲取JSON錯誤：輸入端在字符0

<?php 


require_once('include/db_functions.php'); 
$db = new DB_Functions(); 

// json response array 
$response = array("error" => FALSE); 

if (isset($_POST['email']) && isset($_POST['password'])) { 

    // receiving the post params 
    $email = $_POST['email']; 
    $password = $_POST['password']; 

    // get the user by email and password 
    $user = $db->getUserByEmailAndPassword($email, $password); 

    if ($user != false) { 
     // use is found 
     $response["error"] = FALSE; 
     $response["uid"] = $user["unique_id"]; 
     $response["user"]["name"] = $user["name"]; 
     $response["user"]["email"] = $user["email"]; 
     $response["user"]["created_at"] = $user["created_at"]; 
     $response["user"]["updated_at"] = $user["updated_at"]; 

    } else { 
     // user is not found with the credentials 
     $response["error"] = TRUE; 
     $response["error_msg"] = "Login credentials are wrong. Please try again!"; 
    } 
} else { 
    // required post params is missing 
    $response["error"] = TRUE; 
    $response["error_msg"] = "Required parameters username or password is missing!"; 
} 
echo json_encode($response); 
?>

Java代碼：

private void checkLogin(final String email, final String password) { 
    // Tag used to cancel the request 
    String tag_string_req = "req_login"; 

    pDialog.setMessage("Logging in ..."); 
    showDialog(); 

    StringRequest strReq = new StringRequest(Method.POST, 
      AppConfig.URL_LOGIN, new Response.Listener<String>() { 

     @Override 
     public void onResponse(String response) { 
      Log.d(TAG, "Login Response: " + response.toString()); 
      hideDialog(); 

      try { 

       int jsonStart = response.indexOf('{'); 
       int jsonEnd = response.lastIndexOf('}'); 
       if(jsonStart>=0 && jsonEnd>=0 && jsonEnd>jsonStart) response = response.substring(jsonStart,jsonEnd+1); 
       else response = ""; 
       JSONObject jObj = new JSONObject(response); 
       boolean error = jObj.getBoolean("error"); 

       // Check for error node in json 
       if (!error) { 
        // user successfully logged in 
        // Create login session 
        session.setLogin(true); 

        // Now store the user in SQLite 
        String uid = jObj.getString("uid"); 

        JSONObject user = jObj.getJSONObject("user"); 
        String name = user.getString("name"); 
        String email = user.getString("email"); 
        String created_at = user 
          .getString("created_at"); 

        // Inserting row in users table 
        db.addUser(name, email, uid, created_at); 

        // Launch main activity 
        Intent intent = new Intent(LoginActivity.this, 
          MainActivity.class); 
        startActivity(intent); 
        finish(); 
       } else { 
        // Error in login. Get the error message 
        String errorMsg = jObj.getString("error_msg"); 
        Toast.makeText(getApplicationContext(), 
          errorMsg, Toast.LENGTH_LONG).show(); 
       } 
      } catch (JSONException e) { 
       // JSON error 
       e.printStackTrace(); 
       Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show(); 
      } 

     } 
    }, new Response.ErrorListener() { 

     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.e(TAG, "Login Error: " + error.getMessage()); 
      Toast.makeText(getApplicationContext(), 
        error.getMessage(), Toast.LENGTH_LONG).show(); 
      hideDialog(); 
     } 
    }) { 

     @Override 
     protected Map<String, String> getParams() { 
      // Posting parameters to login url 
      Map<String, String> params = new HashMap<String, String>(); 
      params.put("email", email); 
      params.put("password", password); 

      return params; 
     } 

    }; 

    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(strReq, tag_string_req); 
}

UPDATE 1: Logcat:

03-01 15:13:12.889 2099-2099/challenge.edison.harvest I/art: Not late- 

enabling -Xcheck:jni (already on) 
03-01 15:13:13.021 2099-2099/challenge.edison.harvest W/System: ClassLoader referenced unknown path: /data/app/challenge.edison.harvest-1/lib/x86 
03-01 15:13:13.143 2099-2113/challenge.edison.harvest D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true 
03-01 15:13:13.256 2099-2113/challenge.edison.harvest I/OpenGLRenderer: Initialized EGL, version 1.4 
03-01 15:13:13.386 2099-2113/challenge.edison.harvest W/EGL_emulation: eglSurfaceAttrib not implemented 
03-01 15:13:13.386 2099-2113/challenge.edison.harvest W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xad7345a0, error=EGL_SUCCESS 
03-01 15:13:30.769 2099-2113/challenge.edison.harvest W/EGL_emulation: eglSurfaceAttrib not implemented 
03-01 15:13:30.769 2099-2113/challenge.edison.harvest W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xad73a840, error=EGL_SUCCESS 
03-01 15:13:33.005 2099-2105/challenge.edison.harvest W/art: Suspending all threads took: 779.254ms 
03-01 15:13:33.006 2099-2099/challenge.edison.harvest I/Choreographer: Skipped 48 frames! The application may be doing too much work on its main thread. 
03-01 15:13:34.301 2099-2105/challenge.edison.harvest W/art: Suspending all threads took: 629.777ms 
03-01 15:13:34.302 2099-2099/challenge.edison.harvest I/Choreographer: Skipped 38 frames! The application may be doing too much work on its main thread. 
03-01 15:13:35.046 2099-2099/challenge.edison.harvest D/RegisterActivity: Login Response: <br><table border='1' cellpadding='2' bgcolor='#FFFFDF' bordercolor='#E8B900' align='center'><tr><td><font face='Arial' size='1' color='#000000'><b>PHP Error Message</b></font></td></tr></table><br /> 
                      <b>Fatal error</b>: Call to undefined method mysqli_stmt::get_result() in <b>/home/a6777446/public_html/include/db_functions.php</b> on line <b>64</b><br /> 
                      <br><table border='1' cellpadding='2' bgcolor='#FFFFDF' bordercolor='#E8B900' align='center'><tr><td><div align='center'><a href='http://www.000webhost.com/'><font face='Arial' size='1' color='#000000'>Free Web Hosting</font></a></div></td></tr></table> 
03-01 15:13:35.089 2099-2113/challenge.edison.harvest E/Surface: getSlotFromBufferLocked: unknown buffer: 0xab7510d0 
03-01 15:13:35.096 2099-2099/challenge.edison.harvest W/System.err: org.json.JSONException: End of input at character 0 of 
03-01 15:13:35.096 2099-2099/challenge.edison.harvest W/System.err:  at org.json.JSONTokener.syntaxError(JSONTokener.java:449) 
03-01 15:13:35.097 2099-2099/challenge.edison.harvest W/System.err:  at org.json.JSONTokener.nextValue(JSONTokener.java:97) 
03-01 15:13:35.097 2099-2099/challenge.edison.harvest W/System.err:  at org.json.JSONObject.<init>(JSONObject.java:156) 
03-01 15:13:35.097 2099-2099/challenge.edison.harvest W/System.err:  at org.json.JSONObject.<init>(JSONObject.java:173) 
03-01 15:13:35.097 2099-2099/challenge.edison.harvest W/System.err:  at challenge.edison.harvest.LoginActivity$3.onResponse(LoginActivity.java:128) 
03-01 15:13:35.100 2099-2099/challenge.edison.harvest W/System.err:  at challenge.edison.harvest.LoginActivity$3.onResponse(LoginActivity.java:115) 
03-01 15:13:35.102 2099-2099/challenge.edison.harvest W/System.err:  at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60) 
03-01 15:13:35.103 2099-2099/challenge.edison.harvest W/System.err:  at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30) 
03-01 15:13:35.103 2099-2099/challenge.edison.harvest W/System.err:  at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) 
03-01 15:13:35.103 2099-2099/challenge.edison.harvest W/System.err:  at android.os.Handler.handleCallback(Handler.java:739) 
03-01 15:13:35.104 2099-2099/challenge.edison.harvest W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
03-01 15:13:35.104 2099-2099/challenge.edison.harvest W/System.err:  at android.os.Looper.loop(Looper.java:148) 
03-01 15:13:35.104 2099-2099/challenge.edison.harvest W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:5417) 
03-01 15:13:35.104 2099-2099/challenge.edison.harvest W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
03-01 15:13:35.104 2099-2099/challenge.edison.harvest W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
03-01 15:13:35.104 2099-2099/challenge.edison.harvest W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
03-01 15:13:35.113 2099-2099/challenge.edison.harvest D/Volley: [1] Request.finish: 4449 ms: [ ] http://edisonharvest.comxa.com/login.php 0xafab10d0 NORMAL 1 
03-01 15:13:35.242 2099-2113/challenge.edison.harvest W/EGL_emulation: eglSurfaceAttrib not implemented 
03-01 15:13:35.242 2099-2113/challenge.edison.harvest W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xad75aae0, error=EGL_SUCCESS 
03-01 15:13:38.626 2099-2113/challenge.edison.harvest E/Surface: getSlotFromBufferLocked: unknown buffer: 0xab7524f0

UPDATE 2: DB_FUNCTIONS.php

<?php 

class DB_Functions { 

    private $conn; 

    // constructor 
    function __construct() { 
     require_once 'db_connect.php'; 
     // connecting to database 
     $db = new Db_Connect(); 
     $this->conn = $db->connect(); 
    } 

    // destructor 
    function __destruct() { 

    } 

    /** 
    * Storing new user 
    * returns user details 
    */ 
    public function storeUser($name, $email, $password) { 
     $uuid = uniqid('', true); 
     $hash = $this->hashSSHA($password); 
     $encrypted_password = $hash["encrypted"]; // encrypted password 
     $salt = $hash["salt"]; // salt 

     $stmt = $this->conn->prepare("INSERT INTO users(unique_id, name, email, encrypted_password, salt, created_at) VALUES(?, ?, ?, ?, ?, NOW())"); 
     $stmt->bind_param("sssss", $uuid, $name, $email, $encrypted_password, $salt); 
     $result = $stmt->execute(); 
     $stmt->close(); 

     // check for successful store 
     if ($result) { 
      $stmt = $this->conn->prepare("SELECT * FROM users WHERE email = ?"); 
      $stmt->bind_param("s", $email); 
      $stmt->execute(); 
      $user = $stmt->get_result()->fetch_assoc(); 
      $stmt->close(); 

      return $user; 
     } else { 
      return false; 
     } 
    } 

    /** 
    * Get user by email and password 
    */ 
    public function getUserByEmailAndPassword($email, $password) { 

     $stmt = $this->conn->prepare("SELECT * FROM users WHERE email = ?"); 

     $stmt->bind_param("s", $email); 

     if ($stmt->execute()) { 
      $user = $stmt->get_result()->fetch_assoc(); 
      $stmt->close(); 

      // verifying user password 
      $salt = $user['salt']; 
      $encrypted_password = $user['encrypted_password']; 
      $hash = $this->checkhashSSHA($salt, $password); 
      // check for password equality 
      if ($encrypted_password == $hash) { 
       // user authentication details are correct 
       return $user; 
      } 
     } else { 
      return NULL; 
     } 
    } 

    /** 
    * Check user is existed or not 
    */ 
    public function isUserExisted($email) { 
     $stmt = $this->conn->prepare("SELECT email from users WHERE email = ?"); 

     $stmt->bind_param("s", $email); 

     $stmt->execute(); 

     $stmt->store_result(); 

     if ($stmt->num_rows > 0) { 
      // user existed 
      $stmt->close(); 
      return true; 
     } else { 
      // user not existed 
      $stmt->close(); 
      return false; 
     } 
    } 

    /** 
    * Encrypting password 
    * @param password 
    * returns salt and encrypted password 
    */ 
    public function hashSSHA($password) { 

     $salt = sha1(rand()); 
     $salt = substr($salt, 0, 10); 
     $encrypted = base64_encode(sha1($password . $salt, true) . $salt); 
     $hash = array("salt" => $salt, "encrypted" => $encrypted); 
     return $hash; 
    } 

    /** 
    * Decrypting password 
    * @param salt, password 
    * returns hash string 
    */ 
    public function checkhashSSHA($salt, $password) { 

     $hash = base64_encode(sha1($password . $salt, true) . $salt); 

     return $hash; 
    } 

} 

?>

在登記數據被儲存了在服務器上，但我登錄時出現此錯誤。這似乎是我得到空json對象。我正在使用000webhost。我正在爲一個重要的項目工作。請幫忙！！！謝謝！

來源

2016-03-01 Maulik Solanki

檢查瀏覽器上的網址，如果它返回正確的JSON .. – ELITE

登錄回覆並顯示給我們！ – CodeWalker

@LancePreston我已經包含logcat –

改變你的功能getUserByEmailAndPassword像下面。

變更查詢以以下或使其因爲它是和改變$stmt->bind_result() 方法將$stmt->bind_result($col1, $col2, $col3)按照由SELECT *查詢檢索的列。

$stmt = $this->conn->prepare("SELECT salt, encrypted_password FROM users WHERE email = ?"); 

$stmt->bind_param("s", $email); 

if ($stmt->execute()) { 
    $stmt->bind_result($salt, $encrypted_password); 
    if($stmt->fetch()) { 
     // verifying user password 
     $hash = $this->checkhashSSHA($salt, $password); 
     // check for password equality 
     if ($encrypted_password == $hash) { 
      $user = array(); 
      $user["salt"] = $salt; 
      $user["encrypted_password"] = $encrypted_password; 
      // if you want to return all the columns from database 
      // then add other lines here 
      // like $user["name"] = $name; 
      // and make sure you have declared $name in bind_result method 
      return $user; 
     } 
    } else { 
     return NULL; 
    } 
} else { 
    return NULL; 
}

也不要忘記在所有其他功能做相對變化。

有關詳情，請的mysqli

此GUID希望它會幫助你。

來源

2016-03-01 10:46:08 ELITE

獲取JSON錯誤：輸入端在字符0

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