PHP ANDROID JSON奇怪的错误

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我，但应用程序崩溃如下调用从Android应用程序，它是这样的文件：PHP ANDROID JSON奇怪的错误

下面的代码：

<?php 
include("connection.php"); 
$src=$_POST['src']; 
$dir=$_POST['tab']; 
if($dir=="up") 
    $tab="TRAINS"; 
else 
    $tab="TRAIN"; 
$sql = "SELECT * FROM ".$tab." WHERE STATIONS LIKE '%".$src."%'"; 

//mysql_select_db($mysql_database); 
$result = mysql_query($sql) 
or die(mysql_error()); 
$json = array(); 
while($row = mysql_fetch_array($result))  
{ 

    $bus = array(
     'id' => $row['_id'], 
     'trainname' => $row['TRAINNAME'], 
     'stations' => $row['STATIONS'], 
     'arrival'=>$row['ARRIVAL'] 
    ); 
    array_push($json, $bus); 
} 

$jsonstring = json_encode($json); 
echo $jsonstring; 
//mysql_close($conn); 
?>

logcat的文件：

04-28 11:02:29.504: E/AndroidRuntime(8748): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mobisys.android.External_to_application/com.mobisys.android.External_to_application.ListTrainsFromSrc}: java.lang.NullPointerException 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1728) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1747) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.ActivityThread.access$1500(ActivityThread.java:155) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.os.Handler.dispatchMessage(Handler.java:130) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.os.Looper.loop(SourceFile:351) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.ActivityThread.main(ActivityThread.java:3814) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at java.lang.reflect.Method.invoke(Method.java:538) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:659) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at dalvik.system.NativeStart.main(Native Method) 
04-28 11:02:29.504: E/AndroidRuntime(8748): Caused by: java.lang.NullPointerException 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at com.mobisys.android.External_to_application.ListTrainsFromSrc.onCreate(ListTrainsFromSrc.java:71) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1692) 
04-28 11:02:29.504: E/AndroidRuntime(8748):  ... 11 more

调用php文件的类： ListTrainsFrmSrc.java

import java.io.IOException; 
import java.io.UnsupportedEncodingException; 
import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

//import com.mobisys.android.External_to_application.R; 

import android.app.Activity; 
import android.content.Intent; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.os.Bundle; 
import android.text.format.Time; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 


public class ListTrainsFromSrc extends Activity{ 
String res=null; 
private static final String TAG_ID = "id"; 
private static final String TAG_TRAINNAME = "trainname"; 
private static final String TAG_STATIONS = "stations"; 
private static final String TAG_ARRIVAL = "arrival"; 
ArrayList<String> indexes=null; 
ArrayList<String> Tables=null; 
//String res=null; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    this.setContentView(R.layout.single_list_item_view); 
    String[] tabdata=null; 
    Time dtNow = new Time(); 
    dtNow.setToNow(); 
    int hours = dtNow.hour; 
    int minutes = dtNow.minute; 
    int time=hours*100+minutes; 
    ArrayList<String> indexes=new ArrayList<String>(); 
    ArrayList<String> Tables = new ArrayList<String>(); 
    Intent i = getIntent(); 
    // getting attached intent data 
    String product = i.getStringExtra("Station"); 
    String dir=i.getStringExtra("Dir"); 
    String url="http://hotelmanagement.hostoi.com/dinesh/onlysrc.php"; 
    List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(2); 
    nameValuePair.add(new BasicNameValuePair("src", product)); 
    nameValuePair.add(new BasicNameValuePair("tab",dir)); 

    JSONParser jParser = new JSONParser(); 

    // getting JSON string from URL 
    final JSONArray json = jParser.getJSONFromUrl(url,nameValuePair); 
    try{ 
    for(int p = 0; p < json.length(); p++){ 
     JSONObject jobj = json.getJSONObject(p); 

     // Storing each json item in variable 
     String id = jobj.getString(TAG_ID); 
     String name = jobj.getString(TAG_TRAINNAME); 
     String stations = jobj.getString(TAG_STATIONS); 
     String arr = jobj.getString(TAG_ARRIVAL); 

     String stn[]=stations.split(","); 
     String arrt[]=arr.split(","); 
     for(int j=0;j<stn.length;j++) 
      { 
        if(stn[j].equals(product) && stn.length==arrt.length){ 
         int start_time=Integer.parseInt(arrt[j]); 
         if(start_time>time){ 
          indexes.add(id); 
          Tables.add(arrt[j]+"\t"+name); 
         } 

        break; 
       } 
      } 
     } 

     tabdata=Tables.toArray(new String[Tables.size()]); 
     final int[] a = new int[indexes.size()]; 
     int l = 0; 

     for (String integer : indexes) 
      a[l++] = Integer.parseInt(integer); 
     ListView listView1 = (ListView) findViewById(R.id.listView1); 
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
       android.R.layout.simple_list_item_1, tabdata); 
     listView1.setAdapter(adapter); 

     listView1.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 
        Intent i = new Intent(getApplicationContext(), ListTrainDetails.class); 
        i.putExtra("trainID",a[position]); 
        i.putExtra("json",json.toString()); 

        startActivity(i); 
       } 
       }); 

    }catch(JSONException e) { 
     e.printStackTrace(); 
    } 
    } 
}

JSONParser.java

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.UnsupportedEncodingException; 
import java.util.List; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.util.Log; 

public class JSONParser { 

    static InputStream is = null; 
    static JSONArray jArray = null; 
    static String json = ""; 

    // constructor 
    public JSONParser() { 

    } 

    public JSONArray getJSONFromUrl(String url,List<NameValuePair> nvp) { 

     // Making HTTP request 
     try { 
      // defaultHttpClient 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 
      httpPost.setEntity(new UrlEncodedFormEntity(nvp)); 

      HttpResponse httpResponse = httpClient.execute(httpPost); 
      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 { 
      jArray = new JSONArray(json); 
     } catch (JSONException e) { 
      Log.e("JSON Parser", "Error parsing data " + e.toString()); 
     } 

     // return JSON String 
     return jArray; 

    } 
}

来源

2013-04-28 Dinesh Ramchandani

在PHP中连接字符串用点操作，不与+操作

所以这行（。）：

$sql = "SELECT * FROM "+$tab+" WHERE STATIONS LIKE '%"+src+"%"+$dest+"%'" ;

应如：

$sql = "SELECT * FROM ".$tab." WHERE STATIONS LIKE '%".src."%".$dest."%'" ;

此外，您的代码易受SQL注入攻击。

尝试从mysql_职能远离，并使用PDO或至少mysqli的

来源

2013-04-28 03:35:21 ILikeTacos

糟糕！太多的Java！谢谢！ :) – 2013-04-28 03:41:53

不是问题！不要忘记将问题标记为已回答，以便其他人也可能会发现它也有帮助。 – ILikeTacos 2013-04-28 03:42:47

再次出现问题。我现在搜索了这个问题：“你的SQL语法有错误;查看与你的MySQL服务器版本相对应的手册，在第一行'%%'附近使用正确的语法。由于“%%”符号，找不到任何东西。 – 2013-04-28 03:56:11

在PHP中，.用来连接字符串，而不是+。使用+将它们添加为数字，在这种情况下，结果为0。因此，您正在有效运行mysql_query("0")，这当然不起作用。

来源

2013-04-28 03:35:29

PHP中的字符串连接使用.而不是+完成。

$sql = "SELECT * FROM ".$tab." WHERE STATIONS LIKE '%".src."%".$dest."%'" ;

来源

2013-04-28 03:35:35 Musa

在php中，您使用concat作为字符串。（点）运算符，而不是（+运营商）

变化

$sql = "SELECT * FROM "+$tab+" WHERE STATIONS LIKE '%"+src+"%"+$dest+"%'" ;

到

$sql = "SELECT * FROM ".$tab." WHERE STATIONS LIKE '%".$src."%".$dest."%'" ;

来源

2013-04-28 03:38:01

试试这个

$sql = "SELECT * FROM ".$tab." WHERE STATIONS LIKE '".src."%".$dest."%'" ;

来源

2013-04-28 04:10:02 Yogus

PHP ANDROID JSON奇怪的错误

回答

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