Android空指针异常异步任务

我想使用asyncTask发送带有附加文件的邮件， 我的php代码还可以。。因为当上传小文件时，每次都可以，当我发送没有附件的消息时，一切都会如我所愿。。但当上传大文件（比如大于6MB的apk文件）时，我在这一行得到了空指针异常：（查看onPostExecute）

这是asyncTasck

  public class PostDataAsyncTask extends AsyncTask<String, String, String> {

    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... strings) {
                try {
       uploadFile(fichier);
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }


        return null;
    }

    @Override
    protected void onPostExecute(String lenghtOfFile) {
        int  success2= 0;
        try {
            success2 = json2.getInt("success");
        } catch (JSONException e) {
            e.printStackTrace();
        }
        if(success2==1) {
            ((EditText) findViewById(R.id.etMsg)).setText("");
            if (attach) {
                changerAttach();
                }     }
     } }

请注意字符串“fichier”是我要加载的文件的路径

attach是一个布尔变量，表示我选择了要上载或不上载的文件

json2是一个全局变量（JSONObject），将在upload函数中初始化

我认为这就是您需要的（php代码还可以）

注：我认为一致性是导致我的问题的原因，那么这是真的吗？ 非常感谢

编辑 upload.php文件

    <?php  
date_default_timezone_set ("Africa/Algiers");
include('connect.php');
$response = array();

if (isset($_REQUEST['Emailm'])&& isset($_REQUEST['Mdp'])&&isset($_REQUEST['type']) && isset($_REQUEST['Emailp'])&&isset($_REQUEST['Msg'])  ) {


    $Emailm = $db->real_escape_string($_REQUEST['Emailm']);  
    $Emailp = $db->real_escape_string($_REQUEST['Emailp']); 
    $Mdp = $db->real_escape_string($_REQUEST['Mdp']);  
    $Msg = $_REQUEST['Msg'];  
    $Mdp = $_REQUEST['Mdp'];  
    $Msg= $db->real_escape_string(htmlentities(urldecode($Msg)));    
    $type= $_REQUEST['type'];
    $target_path1 = "attachement/";   
    if($type=="0"){  //compte patient
    if ($result = $db->query("SELECT * FROM `patient` WHERE `Email_p`='$Emailp' AND `Mdp`='$Mdp'")) {
    $row_cnt = $result->num_rows; }
     }else {  //compte médecin
    if ($result = $db->query("SELECT * FROM `med` WHERE `Email`='$Emailm' AND `Mdp`='$Mdp'")) {
    $row_cnt = $result->num_rows; } 
    }


    $b=false;
    $a=false;

    if ($row_cnt>0) {  
                if($_REQUEST['attacher']=="oui"){   
                $filecount = 0;
                $files = glob($target_path1 . "*");
                if ($files){
                $filecount = count($files);
                }
                $nomFichier=$filecount.basename( $_FILES['attachement']['name'])  ; 
                $target_path1 = $target_path1 . $nomFichier;
                $nomFichierOrigin=basename( $_FILES['attachement']['name']);
                if(move_uploaded_file($_FILES['attachement']['tmp_name'], $target_path1)) {
                $b=true;} 
                }
                else{
                $nomFichier="";
                $nomFichierOrigin="";
                };

                       $h=new DateTime("now") ;
                       $s=$h->format('G:i:s');
                       $s2=$h->format('Y-m-d');
                    if($result = mysqli_query($db,"INSERT INTO `msg`(`cle`, `email_m`, `email_p`, `message`, `attachement`, `type`, `attachementNomOrigin`, `heure`, `date`,`vu`) 
                    VALUES ('','$Emailm','$Emailp','$Msg','$nomFichier','$type','$nomFichierOrigin','$s','$s2','non')"))
                    {$a=true;}

                    if($a==true && $b==true && $_REQUEST['attacher']=="oui"){
                     $dernierId = $db->insert_id;   
                     if ($result = $db->query("SELECT * FROM `med` WHERE `Email`='$Emailm' AND `Mdp`='$Mdp'")) {
                     if (mysqli_num_rows($result) > 0) { 
                      $response["Msg"] = array();
                     while ($row = mysqli_fetch_array($result)) {
                    $Msg = array();
                    $Msg["cle"] = intval($row["cle"]);
                    $Msg["heure"] = $row["heure"];
                    $Msg["date"] = $row["date"];
                    $Msg["email_m"] = $row["email_m"]; 
                    $Msg["email_p"] = $row["email_p"]; 
                    $Msg["message"] = $row["message"]; 
                    $Msg["type"] = $row["type"];  
                    $Msg["attachement"] = $row["attachement"]; 
                    $Msg["attachementNomOrigin"] = $row["attachementNomOrigin"]; 
                    array_push($response["Msg"], $Msg);
                     }

                    $response["success"] = 1;
                    $response["message"] = "Succès";
                    }}} else 

                    if($a==true && $_REQUEST['attacher']=="non"){
                    $response["success"] = 1;
                    $response["message"] = "Succès"; 
                    }else{

                    $response["success"] = 0;
                    $response["message"] = "Erreur lors de l'envoi";
                    }

                    echo json_encode($response);
    } else { 
        $response["success"] = 0;
        $response["message"] = "Email ou Mot de passe incorrect";

        echo json_encode($response);
    }
}else { 
    $response["success"] = 0;
    $response["message"] = "Champs manqués";

    echo json_encode($response);
}
?>

在jsonParser中，我有一个奇怪的例子

System.out.println(String.valueOf(json);

即使出现异常，您也可以在logcat中看到json对象……因此这是一个计时问题。。你觉得怎么样

Edit2 JsonParser.java

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 mehtod
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();
    }catch (Exception e){};

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
        System.out.println(json);
        //HERE IS THE SYSTEM.OUT.PRINT THAT I TALK ABOUT
        //YOU CAN SEE THE RESULT IN THE LOGCAT
    } 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;

}

公共类JSONParser{
静态InputStream为空；
静态JSONObject jObj=null；
静态字符串json=“”；
//建造师
公共JSONParser（）{
}
//函数从url获取json
//通过使用HTTP POST或GET方法
公共JSONObject makeHttpRequest（字符串url、字符串方法、，
列表参数）{
//发出HTTP请求
试一试{
//检查请求方法
如果（方法==“POST”）{
//请求方法为POST
//defaultHttpClient
DefaultHttpClient httpClient=新的DefaultHttpClient（）；
HttpPost HttpPost=新的HttpPost（url）；
setEntity（新的UrlEncodedFormEntity（参数））；
HttpResponse HttpResponse=httpClient.execute（httpPost）；
HttpEntity HttpEntity=httpResponse.getEntity（）；
is=httpEntity.getContent（）；
}else if（方法==“GET”）{
//请求方法是GET
DefaultHttpClient httpClient=新的DefaultHttpClient（）；
String paramString=URLEncodedUtils.format（params，“utf-8”）；
url+=“？”+参数字符串；
HttpGet HttpGet=新的HttpGet（url）；
HttpResponse HttpResponse=httpClient.execute（httpGet）；
HttpEntity HttpEntity=httpResponse.getEntity（）；
is=httpEntity.getContent（）；
}           
}捕获（不支持的编码异常e）{
e、 printStackTrace（）；
}捕获（客户端协议例外e）{
e、 printStackTrace（）；
}捕获（IOE异常）{
e、 printStackTrace（）；
}捕获（例外e）{}；
试一试{
BufferedReader reader=新的BufferedReader（新的InputStreamReader(
为“UTF-8”）、8）；
StringBuilder sb=新的StringBuilder（）；
字符串行=null；
而（（line=reader.readLine（））！=null）{
sb.追加（第+行“\n”）；
}
is.close（）；
json=sb.toString（）；
System.out.println（json）；
//这是我说的SYSTEM.OUT.PRINT
//您可以在LOGCAT中看到结果
}捕获（例外e）{
Log.e（“缓冲区错误”，“错误转换结果”+e.toString（））；
}
//尝试将字符串解析为JSON对象
试一试{
jObj=新的JSONObject（json）；
}捕获（JSONException e）{
Log.e（“JSON解析器”，“错误解析数据”+e.toString（））；
}
//返回JSON字符串
返回jObj；
}

}

让您了解我面临的问题： 我想在这里清除文本：

---

发送消息后，这就是我在postExecute中检查成功标记的原因。如果您有其他方法，我将对此表示感谢。。请注意，这是我的第一个应用程序，所以我不知道其他方法来实现这一点

问题出在php代码中。。这是正确的

    <?php  
date_default_timezone_set ("Africa/Algiers");
include('connect.php');
$response = array();

if (isset($_REQUEST['Emailm'])&& isset($_REQUEST['Mdp'])&&isset($_REQUEST['type']) && isset($_REQUEST['Emailp'])&&isset($_REQUEST['Msg'])  ) {

    $Emailm = $db->real_escape_string($_REQUEST['Emailm']);  
    $Emailp = $db->real_escape_string($_REQUEST['Emailp']); 
    $Mdp = $db->real_escape_string($_REQUEST['Mdp']);  
    $Msg = $_REQUEST['Msg'];  
    $Mdp = $_REQUEST['Mdp'];  
    $Msg= $db->real_escape_string(htmlentities(urldecode($Msg)));    
    $type= $_REQUEST['type'];
    $target_path1 = "attachement/";   
    if($type=="0"){  //compte patient
    if ($result = $db->query("SELECT * FROM `patient` WHERE `Email_p`='$Emailp' AND `Mdp`='$Mdp'")) {
    $row_cnt = $result->num_rows; 
 }
     }else {  //compte médecin
    if ($result = $db->query("SELECT * FROM `med` WHERE `Email`='$Emailm' AND `Mdp`='$Mdp'")) {
    $row_cnt = $result->num_rows; 
 } 
    }


    $b=false;
    $a=false;

    if ($row_cnt>0) {  
                if($_REQUEST['attacher']=="oui"){       
                $filecount = 0;
                $files = glob($target_path1 . "*");
                if ($files){
                $filecount = count($files); 
                }
                $nomFichier=$filecount.basename( $_FILES['attachement']['name']) . ".a"; 
                $target_path1 = $target_path1 . $nomFichier;
                $nomFichierOrigin=basename( $_FILES['attachement']['name']);
                if(move_uploaded_file($_FILES['attachement']['tmp_name'], $target_path1)) {
                $b=true; } 
                }
                else{
                $nomFichier="";
                $nomFichierOrigin=""; 
                };

                       $h=new DateTime("now") ;
                       $s=$h->format('G:i:s');
                       $s2=$h->format('Y-m-d');
                    if($result = mysqli_query($db,"INSERT INTO `msg`(`cle`, `email_m`, `email_p`, `message`, `attachement`, `type`, `attachementNomOrigin`, `heure`, `date`,`vu`) 
                    VALUES ('','$Emailm','$Emailp','$Msg','$nomFichier','$type','$nomFichierOrigin','$s','$s2','non')"))
                    {$a=true;$dernierId = $db->insert_id;
                     }

                    if($a==true && $b==true && $_REQUEST['attacher']=="oui"){


                     if ($result = $db->query("SELECT * FROM msg WHERE cle='$dernierId'")) {
                     if (mysqli_num_rows($result) > 0) { 
                      $response["Msg"] = array();
                     while ($row = mysqli_fetch_array($result)) {
                    $Msg = array();
                    $Msg["cle"] = intval($row["cle"]);
                    $Msg["heure"] = $row["heure"];
                    $Msg["date"] = $row["date"];
                    $Msg["email_m"] = $row["email_m"]; 
                    $Msg["email_p"] = $row["email_p"]; 
                    $Msg["message"] = $row["message"]; 
                    $Msg["type"] = $row["type"];  
                    $Msg["attachement"] = $row["attachement"]; 
                    $Msg["attachementNomOrigin"] = $row["attachementNomOrigin"]; 
                    array_push($response["Msg"], $Msg);
                     }

                    $response["success"] = 1;
                    $response["message"] = "Succès"; 
                    }}} else 

                    if($a==true && $_REQUEST['attacher']=="non"){ 
                    $response["success"] = 1;
                    $response["message"] = "Succès"; 
                    }else{ 
                    $response["success"] = 0;
                    $response["message"] = "Erreur lors de l'envoi";
                    }


    } else {  
        $response["success"] = 0;
        $response["message"] = "Email ou Mot de passe incorrect";


    }
}else { 

    $response["success"] = 0;
    $response["message"] = "Champs manqués";


} echo json_encode($response);
?>

---

在
onPostExecute（）
中什么是
json2
？当您收到此错误时，文件是否已成功上载？在我看来，
response
是
null
，因此
json2
也将是null。在本例中，此调用可能返回
null
：
response=httpclient.execute（httpost）当我打开附件文件夹时，我可以打开或读取该文件。。这意味着即使应用程序停止，它也已成功上载，你是对的，我必须提到这一点，为什么在小文件（200 Kb大小）的情况下…为什么在这种情况下没有例外？BufferedReader BufferedReader=new BufferedReader（new InputStreamReader（response.getEntity（）.getContent（））；字符串msg=“”；字符串行=”；而（（line=bufferreader.readLine（））！=null）{msg+=line；}Log.i（“msg=”，“”+msg）；
System.out.println(String.valueOf(json);

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 mehtod
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();
    }catch (Exception e){};

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
        System.out.println(json);
        //HERE IS THE SYSTEM.OUT.PRINT THAT I TALK ABOUT
        //YOU CAN SEE THE RESULT IN THE LOGCAT
    } 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;

}

    <?php  
date_default_timezone_set ("Africa/Algiers");
include('connect.php');
$response = array();

if (isset($_REQUEST['Emailm'])&& isset($_REQUEST['Mdp'])&&isset($_REQUEST['type']) && isset($_REQUEST['Emailp'])&&isset($_REQUEST['Msg'])  ) {

    $Emailm = $db->real_escape_string($_REQUEST['Emailm']);  
    $Emailp = $db->real_escape_string($_REQUEST['Emailp']); 
    $Mdp = $db->real_escape_string($_REQUEST['Mdp']);  
    $Msg = $_REQUEST['Msg'];  
    $Mdp = $_REQUEST['Mdp'];  
    $Msg= $db->real_escape_string(htmlentities(urldecode($Msg)));    
    $type= $_REQUEST['type'];
    $target_path1 = "attachement/";   
    if($type=="0"){  //compte patient
    if ($result = $db->query("SELECT * FROM `patient` WHERE `Email_p`='$Emailp' AND `Mdp`='$Mdp'")) {
    $row_cnt = $result->num_rows; 
 }
     }else {  //compte médecin
    if ($result = $db->query("SELECT * FROM `med` WHERE `Email`='$Emailm' AND `Mdp`='$Mdp'")) {
    $row_cnt = $result->num_rows; 
 } 
    }


    $b=false;
    $a=false;

    if ($row_cnt>0) {  
                if($_REQUEST['attacher']=="oui"){       
                $filecount = 0;
                $files = glob($target_path1 . "*");
                if ($files){
                $filecount = count($files); 
                }
                $nomFichier=$filecount.basename( $_FILES['attachement']['name']) . ".a"; 
                $target_path1 = $target_path1 . $nomFichier;
                $nomFichierOrigin=basename( $_FILES['attachement']['name']);
                if(move_uploaded_file($_FILES['attachement']['tmp_name'], $target_path1)) {
                $b=true; } 
                }
                else{
                $nomFichier="";
                $nomFichierOrigin=""; 
                };

                       $h=new DateTime("now") ;
                       $s=$h->format('G:i:s');
                       $s2=$h->format('Y-m-d');
                    if($result = mysqli_query($db,"INSERT INTO `msg`(`cle`, `email_m`, `email_p`, `message`, `attachement`, `type`, `attachementNomOrigin`, `heure`, `date`,`vu`) 
                    VALUES ('','$Emailm','$Emailp','$Msg','$nomFichier','$type','$nomFichierOrigin','$s','$s2','non')"))
                    {$a=true;$dernierId = $db->insert_id;
                     }

                    if($a==true && $b==true && $_REQUEST['attacher']=="oui"){


                     if ($result = $db->query("SELECT * FROM msg WHERE cle='$dernierId'")) {
                     if (mysqli_num_rows($result) > 0) { 
                      $response["Msg"] = array();
                     while ($row = mysqli_fetch_array($result)) {
                    $Msg = array();
                    $Msg["cle"] = intval($row["cle"]);
                    $Msg["heure"] = $row["heure"];
                    $Msg["date"] = $row["date"];
                    $Msg["email_m"] = $row["email_m"]; 
                    $Msg["email_p"] = $row["email_p"]; 
                    $Msg["message"] = $row["message"]; 
                    $Msg["type"] = $row["type"];  
                    $Msg["attachement"] = $row["attachement"]; 
                    $Msg["attachementNomOrigin"] = $row["attachementNomOrigin"]; 
                    array_push($response["Msg"], $Msg);
                     }

                    $response["success"] = 1;
                    $response["message"] = "Succès"; 
                    }}} else 

                    if($a==true && $_REQUEST['attacher']=="non"){ 
                    $response["success"] = 1;
                    $response["message"] = "Succès"; 
                    }else{ 
                    $response["success"] = 0;
                    $response["message"] = "Erreur lors de l'envoi";
                    }


    } else {  
        $response["success"] = 0;
        $response["message"] = "Email ou Mot de passe incorrect";


    }
}else { 

    $response["success"] = 0;
    $response["message"] = "Champs manqués";


} echo json_encode($response);
?>