Android：如何將Java.String轉換爲JSONObject

我剛剛開始使用Android Studio進行編碼，並且偶然發現了一個問題，我找不到解決方案。我試圖創建一個登錄/註冊活動，並同時註冊工作完美的登錄是給我很難下一個錯誤：Android：如何將Java.String轉換爲JSONObject

"Json error :Value<br><table of type java.lang.String cannot be converted to JSONObject"

調試時，我設法找到問題和虐待粘貼的源代碼在這裏：

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 { 

       **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; 
     } 

    };

調試器將我指向標有** ... **的行。

如果任何人都可以幫我解決這個問題，我將不勝感激。（如果需要更多的代碼或類似的東西只是讓我知道，並添加它）。

btw我使用的是具有MYSQL版本的000webhost。 5.1。數據庫連接是好的，它的工作（在註冊測試，它工作很好）。

我得到DDMS錯誤，

11-29 17:42:04.036: D/RegisterActivity(2188): 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 /> 
11-29 17:42:04.036: D/RegisterActivity(2188): <b>Fatal error</b>: Call to undefined method mysqli_stmt::get_result() in <b>/home/a4085630/public_html/include/DB_Functions.php</b> on line <b>59</b><br /> 
11-29 17:42:04.036: D/RegisterActivity(2188): <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> 
11-29 17:42:04.059: E/Surface(2188): getSlotFromBufferLocked: unknown buffer: 0xb3f967c0 
11-29 17:42:04.065: W/System.err(2188): org.json.JSONException: Value <br><table of type java.lang.String cannot be converted to JSONObject 
11-29 17:42:04.065: W/System.err(2188):  at org.json.JSON.typeMismatch(JSON.java:111) 
11-29 17:42:04.065: W/System.err(2188):  at org.json.JSONObject.<init>(JSONObject.java:160) 
11-29 17:42:04.065: W/System.err(2188):  at org.json.JSONObject.<init>(JSONObject.java:173) 
11-29 17:42:04.065: W/System.err(2188):  at markitcommunity.org.markit.activity.LoginActivity$3.onResponse(LoginActivity.java:123) 
11-29 17:42:04.065: W/System.err(2188):  at markitcommunity.org.markit.activity.LoginActivity$3.onResponse(LoginActivity.java:114) 
11-29 17:42:04.065: W/System.err(2188):  at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60) 
11-29 17:42:04.065: W/System.err(2188):  at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30) 
11-29 17:42:04.065: W/System.err(2188):  at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) 
11-29 17:42:04.065: W/System.err(2188):  at android.os.Handler.handleCallback(Handler.java:739) 
11-29 17:42:04.065: W/System.err(2188):  at android.os.Handler.dispatchMessage(Handler.java:95) 
11-29 17:42:04.065: W/System.err(2188):  at android.os.Looper.loop(Looper.java:148) 
11-29 17:42:04.065: W/System.err(2188):  at android.app.ActivityThread.main(ActivityThread.java:5417) 
11-29 17:42:04.065: W/System.err(2188):  at java.lang.reflect.Method.invoke(Native Method) 
11-29 17:42:04.066: W/System.err(2188):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
11-29 17:42:04.066: W/System.err(2188):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
11-29 17:42:04.114: W/EGL_emulation(2188): eglSurfaceAttrib not implemented 
11-29 17:42:04.114: W/OpenGLRenderer(2188): Failed to set EGL_SWAP_BEHAVIOR on surface 0xa2dc7a20, error=EGL_SUCCESS

DB_Functions.PHP碼 -

<?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(); 
      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; 
    } 

} 

?>

經過很長的研究幾乎無處不在，改變我的主人，我意識到，這個特定的行什麼給錯誤：

$user = $stmt->get_result()->fetch_assoc();

因爲它獲取表格的HTML版本我而不是其內容進入用戶。

任何人有任何想法如何解決這個請嗎？

來源

2015-11-29 Daniel Netzer

有一些''
文字出現在你的'JSON'響應不能被轉換爲'JSONObject' – Wizard

它看起來像你的迴應，而不是JSON基於該錯誤 –

HTML作爲一個空間？它接收一個「電子郵件」和編碼64位密碼..哪裏可能是問題，我該如何克服它？ –

很好的經過很長時間的研究似乎我的虛擬主機不支持mysqlnd驅動程序，因此我將代碼更改爲以下內容並解決了問題。

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

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

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

    if ($stmt->execute()) { 
      $stmt->store_result(); 
      $num_of_rows = $stmt->num_rows; 
      $stmt->bind_result($aid, $aname, $aemail, $acreated_at, $aupdated_at , $aencrypted_password , $asalt); 

        while ($stmt->fetch()) { 
        $user[0] = $aid; 
        $user[1] = $aname; 
        $user[2] = $aemail; 
        $user[3] = $acreated_at; 
        $user[4] = $aupdated_at; 
        $user[5] = $aencrypted_password; 
        $user[6] = $asalt; 
        $user[7] = $this->checkhashSSHA($asalt, $password); 
        } 
      $stmt->free_result(); 
      $stmt->close(); 
      return $user; 
      } else { 
      return NULL; 
      } 
    }

它幾乎一次從SQL 1列收集數據，abit沒有動態但它工作。

來源

2015-11-30 12:20:06

Android：如何將Java.String轉換爲JSONObject

回答

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