Java 我的服务器似乎用html或css页面而不是JSON响应

我正在开发一个android应用程序，其中maing页面main activity（MainActivity.java）包含8个按钮。单击任何按钮都会引导我进入下一个活动，即支付活动（PaymentActivity.java）。付款活动是从我在webhost免费托管下在MySQL中创建的数据库（我的表列名为-1 accno和2 bpassword）中验证我的用户是否具有正确的帐号和密码。用于连接到我正在使用PHP脚本的webhost服务器。当我输入我的MySQL数据库中已经存储的账号和密码并点击“支付”按钮时，它应该与服务器端的MySQL数据库进行验证，并显示“支付成功”的祝酒词。现在当我在模拟器中运行此应用程序时…经过处理直到“检查网络加载”，“联系服务器检查凭据”（请参阅PaymentActivity.java代码了解此内容），但在此之后，它显示“不幸的是，buttonphp（我的appname）已停止”“。我在这里发布我的全部android代码。请通过指定我的错误来帮助我，并告诉我修复该错误的正确代码。我们将非常感谢您的任何帮助、建议或建议。提前谢谢你

PaymentActivity.java

package com.example.buttonphp;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.example.buttonphp.library.DatabaseHandler;
import com.example.buttonphp.library.UserFunctions;


public class PaymentActivity extends Activity {

Button button1;
EditText inputAccno;
EditText inputPassword;
private TextView loginErrorMsg;

// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_ACCOUNTNO = "accno";


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_payment);

// Importing all assets like buttons, text fields
inputAccno = (EditText) findViewById(R.id.accountno);
inputPassword = (EditText) findViewById(R.id.password);
button1 = (Button) findViewById(R.id.button1);
loginErrorMsg = (TextView) findViewById(R.id.login_error);



button1.setOnClickListener(new View.OnClickListener() {

    public void onClick(View view) {

if (  ( !inputAccno.getText().toString().equals("")) && 
(!inputPassword.getText().toString().equals("")) )
         {
             NetAsync(view);
         }
else if ( ( !inputAccno.getText().toString().equals("")) )
         {
             Toast.makeText(getApplicationContext(),
                     "Password field empty", Toast.LENGTH_SHORT).show();
         }
else if ( ( !inputPassword.getText().toString().equals("")) )
         {
             Toast.makeText(getApplicationContext(),
                     "Account no field empty", Toast.LENGTH_SHORT).show();
         }
else
         {
             Toast.makeText(getApplicationContext(),
             "Account no and Password fields are empty", Toast.LENGTH_SHORT).show();
         }
     }
 });

}

/**
 * Async Task to check whether internet connection is working.
**/

 private class NetCheck extends AsyncTask<String,String,Boolean>
 {
    private ProgressDialog nDialog;

    @Override
    protected void onPreExecute(){
        super.onPreExecute();
        nDialog = new ProgressDialog(PaymentActivity.this);
        nDialog.setTitle("Checking Network");
        nDialog.setMessage("Loading..");
        nDialog.setIndeterminate(false);
        nDialog.setCancelable(true);
        nDialog.show();
    }

/**
* Gets current device state and checks for working internet connection by trying Google.
    **/


//     private ProgressDialog nDialog;


 @Override
    protected Boolean doInBackground(String... args){



 ConnectivityManager cm = (ConnectivityManager)
  getSystemService(Context.CONNECTIVITY_SERVICE);
   NetworkInfo netInfo = cm.getActiveNetworkInfo();
   if (netInfo != null && netInfo.isConnected()) {
      try {
           URL url = new URL("http://www.google.com");
           HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
                urlc.setConnectTimeout(3000);
                urlc.connect();
                if (urlc.getResponseCode() == 200) {
                    return true;
                }
          } catch (MalformedURLException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return false;

    }

    @Override
    protected void onPostExecute(Boolean th){

        if(th == true){
            nDialog.dismiss();
            new ProcessPayment().execute();
        }
        else{
            nDialog.dismiss();
            loginErrorMsg.setText(" Error in Network Connection");
        }
    }


}

/**
 * Async Task to get and send data to My Sql database through JSON respone.
 **/
private class ProcessPayment extends AsyncTask<String, String, JSONObject> {


    private ProgressDialog pDialog;

    String accno,bpassword;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        inputAccno = (EditText) findViewById(R.id.accountno);
        inputPassword = (EditText) findViewById(R.id.password);
        accno = inputAccno.getText().toString();
        bpassword = inputPassword.getText().toString();
        pDialog = new ProgressDialog(PaymentActivity.this);
        pDialog.setTitle("Contacting Servers");
        pDialog.setMessage("Checking credentials ...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected JSONObject doInBackground(String... args) {

        UserFunctions userFunction = new UserFunctions();
        JSONObject json = userFunction.paymentUser(accno, bpassword);
        return json;
    }

    @Override
    protected void onPostExecute(JSONObject json) {
        try {
           if (json.getString(KEY_SUCCESS) != null) {

                String res = json.getString(KEY_SUCCESS);

                if(Integer.parseInt(res) == 1){
                    pDialog.setMessage("Payment in process");
                    //pDialog.setTitle("Getting Data");
             DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                    JSONObject json_user = json.getJSONObject("user");


        /**
        *If JSON array details are stored in SQlite it launches the User Panel.
        **/
        Intent back = new Intent(getApplicationContext(), MainActivity.class);
        back.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    pDialog.dismiss();
                    startActivity(back);
                    /**
                     * Close Login Screen
                     **/
                    finish();
                }else{

                    pDialog.dismiss();
                    loginErrorMsg.setText("Incorrect account no / password");
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
   }
}
public void NetAsync(View view){
    new NetCheck().execute();
}
}

package com.example.buttonHP；
导入java.io.IOException；
导入java.net.HttpURLConnection；
导入java.net.MalformedURLException；
导入java.net.URL；
导入org.json.JSONException；
导入org.json.JSONObject；
导入android.app.Activity；
导入android.app.ProgressDialog；
导入android.content.Context；
导入android.content.Intent；
导入android.net.ConnectivityManager；
导入android.net.NetworkInfo；
导入android.os.AsyncTask；
导入android.os.Bundle；
导入android.view.view；
导入android.widget.Button；
导入android.widget.EditText；
导入android.widget.TextView；
导入android.widget.Toast；
导入com.example.buttonhp.library.DatabaseHandler；
导入com.example.buttonhp.library.UserFunctions；
公共类PaymentActivity扩展活动{
按钮1；
编辑文本输入编号；
编辑文本输入密码；
私有文本视图登录器rormsg；
//JSON响应节点名称
私有静态字符串密钥\u SUCCESS=“SUCCESS”；
私有静态字符串密钥\u ERROR=“ERROR”；
私有静态字符串密钥\u ERROR\u MSG=“ERROR\u MSG”；
私有静态字符串密钥\u ACCOUNTNO=“accno”；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_payment）；
//导入按钮、文本字段等所有资源
InputAcNo=（EditText）findViewById（R.id.accountno）；
inputPassword=（EditText）findViewById（R.id.password）；
button1=（按钮）findViewById（R.id.button1）；
loginErrorMsg=（TextView）findViewById（R.id.login\u错误）；
button1.setOnClickListener（新视图.OnClickListener（）{
公共void onClick（视图）{
如果（（！InputAcNo.getText（）.toString（）.equals（“”））和
（！inputPassword.getText（）.toString（）.equals（“”））
{
NetAsync（视图）；
}
else如果（（！InputAcNo.getText（）.toString（）.equals（“”））的话
{
Toast.makeText（getApplicationContext（），
“密码字段为空”，Toast.LENGTH_SHORT.show（）；
}
如果（（！inputPassword.getText（）.toString（）.equals（“”））为else
{
Toast.makeText（getApplicationContext（），
“帐户无字段为空”，Toast.LENGTH_SHORT.show（）；
}
其他的
{
Toast.makeText（getApplicationContext（），
“账号和密码字段为空”，Toast.LENGTH_SHORT.show（）；
}
}
});
}
/**
*用于检查internet连接是否正常工作的异步任务。
**/
私有类NetCheck扩展了异步任务
{
私人住宅；
@凌驾
受保护的void onPreExecute（）{
super.onPreExecute（）；
nDialog=新进度对话框（PaymentActivity.this）；
nDialog.setTitle（“检查网络”）；
nDialog.setMessage（“加载…”）；
nDialog.SetUndeterminate（假）；
nDialog.setCancelable（真）；
nDialog.show（）；
}
/**
*获取当前设备状态，并通过尝试Google检查internet连接是否正常工作。
**/
//私人住宅；
@凌驾
受保护的布尔doInBackground（字符串…args）{
ConnectionManager cm=（ConnectionManager）
getSystemService（Context.CONNECTIVITY\u服务）；
NetworkInfo netInfo=cm.getActiveNetworkInfo（）；
如果（netInfo！=null&&netInfo.isConnected（））{
试一试{
URL=新URL（“http://www.google.com");
HttpURLConnection urlc=（HttpURLConnection）url.openConnection（）；
设置连接超时（3000）；
connect（）；
如果（urlc.getResponseCode（）==200）{
返回true；
}
}捕获（格式错误的异常e1）{
//TODO自动生成的捕捉块
e1.printStackTrace（）；
}捕获（IOE异常）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
}
返回false；
}
@凌驾
受保护的void onPostExecute（布尔值th）{
如果（th==真）{
nDialog.discouse（）；
新建ProcessPayment（）.execute（）；
}
否则{
nDialog.discouse（）；
loginerrormg.setText（“网络连接错误”）；
}
}
}
/**
*异步任务，通过JSON响应获取数据并将数据发送到我的Sql数据库。
**/
私有类ProcessTask{
私人对话；
字符串accno，bpassword；
@凌驾
受保护的void onPreExecute（）{
super.onPreExecute（）；
InputAcNo=（EditText）findViewById（R.id.accountno）；
inputPassword=（EditText）findViewById（R.id.password）；
accno=InputACNO.getText（）.toString（）；
bpassword=inputPassword.getText（）.toString（）；
pDialog=新专业版
package com.example.buttonphp.library;

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.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

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

// constructor
public JSONParser() {

}

public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {

    // Making HTTP request
    try {
        // 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();

    } 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();
        Log.e("JSON", json);
    } 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;

}
}

03-05 19:47:50.940: D/dalvikvm(2103): GC_FOR_ALLOC freed 48K, 4% free 3228K/3352K,paused 
160ms, total 161ms
03-05 19:47:51.840: D/gralloc_goldfish(2103): Emulator without GPU emulation detected.
03-05 19:47:58.500: I/Choreographer(2103): Skipped 55 frames!  The application may be    
doing too much work on its main thread.
03-05 19:48:02.660: I/Choreographer(2103): Skipped 773 frames!  The application may be 
doing too much work on its main thread.
03-05 19:48:04.660: I/Choreographer(2103): Skipped 130 frames!  The application may be 
doing too much work on its main thread.
03-05 19:48:22.660: D/dalvikvm(2103): GC_FOR_ALLOC freed 141K, 6% free 3600K/3816K,   
paused 56ms, total 64ms
03-05 19:48:22.870: D/dalvikvm(2103): GC_FOR_ALLOC freed 60K, 7% free 3620K/3872K,  
paused 54ms, total 57ms
03-05 19:48:22.890: I/dalvikvm-heap(2103): Grow heap (frag case) to 4.212MB for 635812 
byte allocation
03-05 19:48:23.040: D/dalvikvm(2103): GC_FOR_ALLOC freed <1K, 6% free 4240K/4496K, 
paused 144ms, total 144ms
03-05 19:49:56.120: D/dalvikvm(2103): GC_FOR_ALLOC freed 319K, 9% free 4424K/4820K, 
paused 157ms, total 707ms
03-05 19:51:33.500: I/Choreographer(2103): Skipped 31 frames!  The application may be 
doing too much work on its main thread.
03-05 19:51:34.370: W/InputEventReceiver(2103): Attempted to finish an input event but 
the input event receiver has already been disposed.
03-05 19:51:34.370: I/Choreographer(2103): Skipped 72 frames!  The application may be                        
doing too much work on its main thread.
03-05 19:51:34.990: I/Choreographer(2103): Skipped 154 frames!  The application may be 
doing too much work on its main thread.
03-05 19:51:37.200: I/Choreographer(2103): Skipped 78 frames!  The application may be 
doing too much work on its main thread.
03-05 19:51:37.880: I/Choreographer(2103): Skipped 65 frames!  The application may be 
doing too much work on its main thread.
03-05 19:51:41.090: I/Choreographer(2103): Skipped 31 frames!  The application may be 
03-05 19:51:41.140: E/JSON(2103): <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2      
Final//EN">n<html>n <head>n  <title>Index of /payment</title>n </head>n <body>n<h1>Index        
of /payment</h1>n<ul><li><a href="/"> Parent Directory</a></li>n<li><a href="includep/">   
includep/</a></li>n<li><a href="indexp.php"> indexp.php</a></li>n</ul>n</body></html>n
03-05 19:51:41.200: E/JSON Parser(2103): Error parsing data org.json.JSONException:       
Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
03-05 19:51:41.330: I/Choreographer(2103): Skipped 49 frames!  The application may be   
doing too much work on its main thread.
03-05 19:51:41.470: D/AndroidRuntime(2103): Shutting down VM
03-05 19:51:41.480: W/dalvikvm(2103): threadid=1: thread exiting with uncaught exception   
(group=0xb3a49b90)
03-05 19:51:41.610: E/AndroidRuntime(2103): FATAL EXCEPTION: main
03-05 19:51:41.610: E/AndroidRuntime(2103): Process: com.example.buttonphp, PID: 2103
03-05 19:51:41.610: E/AndroidRuntime(2103): java.lang.NullPointerException
03-05 19:51:41.610: E/AndroidRuntime(2103): at com.example.buttonphp.PaymentActivity                        
$ProcessPayment.onPostExecute(PaymentActivity.java:191)
03-05 19:51:41.610: E/AndroidRuntime(2103): at com.example.buttonphp.PaymentActivity    
$ProcessPayment.onPostExecute(PaymentActivity.java:1)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
android.os.AsyncTask.finish(AsyncTask.java:632)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
android.os.AsyncTask.access$600(AsyncTask.java:177)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
android.os.AsyncTask$InternalHandler.handleMessage    (AsyncTask.java:645)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
android.os.Handler.dispatchMessage(Handler.java:102)
03-05 19:51:41.610: E/AndroidRuntime(2103): at android.os.Looper.loop(Looper.java:137)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
android.app.ActivityThread.main(ActivityThread.java:4998)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
java.lang.reflect.Method.invokeNative(Native Method)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
java.lang.reflect.Method.invoke(Method.java:515)
03-05 19:51:41.610: E/AndroidRuntime(2103): at com.android.internal.os.ZygoteInit    
$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-05 19:51:41.610: E/AndroidRuntime(2103): at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-05 19:51:41.610: E/AndroidRuntime(2103): at dalvik.system.NativeStart.main(Native 
Method)
03-05 19:51:45.450: D/dalvikvm(2103): GC_FOR_ALLOC freed 401K, 10% free 4573K/5052K, 
paused 324ms,total 324ms

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
    <head>
        <title>Index of /payment</title>
    </head>
    <body>
        <h1>Index of /payment</h1>
        <ul>
            <li><a href="/"> Parent Directory</a></li>
            <li><a href="includep/">includep/</a></li>
            <li><a href="indexp.php"> indexp.php</a></li>
        </ul>
    </body>
</html>