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解析数据时json数据错误

[英]json data error while parsing data

 原文  2016-03-22 10:54:49  3   2    java/ php/ android/ json

问题描述

您好，我是android开发的新手，我不知道如何使用JSON 。 我正在尝试使用现有数据库来创建自己的数据库，但是在尝试时遇到错误，无法使用JSON格式将数据发送到服务器。 谁能帮助我解决这个问题或向我提出有效的代码。

这是我的predictionpage.java （主要活动）页面 

public class PredictionActivity extends Activity {

private String URL_NEW_PREDICTION = "http://127.0.0.1/new_predict.php";
private Button btnAddPrediction;

String numOfGoal = "1";
String numOfCard = "1";
String diffOfPos = "1";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_prediction);

    RadioGroup goal = (RadioGroup) findViewById(R.id.answer1);

    goal.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub

            switch (checkedId) {
                case R.id.answer1A:
                    numOfGoal = "1";
                    break;
                case R.id.answer1B:
                    numOfGoal = "2";
                    break;
                case R.id.answer1C:
                    numOfGoal = "3";
                    break;

            }

        }
    });

    RadioGroup card = (RadioGroup) findViewById(R.id.answer2);

    card.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub

            switch (checkedId) {
                case R.id.answer2A:
                    numOfCard = "1";
                    break;
                case R.id.answer2B:
                    numOfCard = "2";
                    break;
                case R.id.answer2C:
                    numOfCard = "3";
                    break;

            }
        }
    });

    RadioGroup pos = (RadioGroup) findViewById(R.id.answer3);

    pos.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub
            switch (checkedId) {
                case R.id.answer3A:
                    diffOfPos = "1";
                    break;
                case R.id.answer3B:
                    diffOfPos = "2";
                    break;
                case R.id.answer3C:
                    diffOfPos = "3";
                    break;

            }

        }
    });

    btnAddPrediction = (Button) findViewById(R.id.submit);

    btnAddPrediction.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            new AddNewPrediction().execute(numOfGoal, numOfCard, diffOfPos);
        }
    });

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_prediction, menu);
    return true;
}

private class AddNewPrediction extends AsyncTask<String, Void, Void> {

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

    }

    @Override
    protected Void doInBackground(String... arg) {
        // TODO Auto-generated method stub
        String goalNo = arg[0];
        String cardNo = arg[1];
        String posDiff = arg[2];

        // Preparing post params
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("goalNo", goalNo));
        params.add(new BasicNameValuePair("cardNo", cardNo));
        params.add(new BasicNameValuePair("posDiff", posDiff));

        ServiceHandler serviceClient = new ServiceHandler();

        String json = serviceClient.makeServiceCall(URL_NEW_PREDICTION,
                ServiceHandler.POST, params);

        Log.d("Create Prediction Request: ", "> " + json);


        if (json != null) {
            try {
                JSONObject jsonObj = new JSONObject(json);
                boolean error = jsonObj.getBoolean("error");
                // checking for error node in json
                if (!error) {
                    // new category created successfully
                    Log.e("Prediction added successfully ",
                            "> " + jsonObj.getString("message"));
                } else {
                    Log.e("Add Prediction Error: ",
                            "> " + jsonObj.getString("message"));
                }

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

        } else {
            Log.e("JSON Data", "JSON data error!");
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
    }
}
}

这是我的ServiceHandler.java页面 

public class ServiceHandler {

static InputStream is = null;
static String response = null;
public final static int GET = 1;
public final static int POST = 2;

public ServiceHandler() {

}

public String makeServiceCall(String url, int method) {
    return this.makeServiceCall(url, method, null);
}


public String makeServiceCall(String url, int method,
                              List<NameValuePair> params) {
    try {

        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpEntity httpEntity = null;
        HttpResponse httpResponse = null;


        if (method == POST) {
            HttpPost httpPost = new HttpPost(url);

            if (params != null) {
                httpPost.setEntity(new UrlEncodedFormEntity(params));
            }

            httpResponse = httpClient.execute(httpPost);

        } else if (method == GET) {

            if (params != null) {
                String paramString = URLEncodedUtils
                        .format(params, "utf-8");
                url += "?" + paramString;
            }
            HttpGet httpGet = new HttpGet(url);

            httpResponse = httpClient.execute(httpGet);

        }
        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, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        response = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error: " + e.toString());
    }

    return response;
}
}

这是我的php服务器页面： 

<?php

$fp=fopen('filename.php','wb');
fwrite($fp, "data to be written");
fclose($fp);
if($fp)
    echo 'checkout';
else 
    echo 'nothing';
exit;

include_once './DbConnect.php';//This page include db connection file


function createNewPrediction() {
     $response = array();
    $goalNum = $_POST["goalNo"];
    $cardNum = $_POST["cardNo"];
    $posDiff = $_POST["posDiff"];
            $db = new DbConnect();
   // mysql query
    $query = "INSERT INTO prediction(goalNum,cardNum,posDiff) VALUES('$goalNum','$cardNum','$posDiff')";
    $result = mysql_query($query) or die(mysql_error().'hello');
    if ($result) {
        $response["error"] = false;
        $response["message"] = "Prediction added successfully!";
        echo'succes';
    } else {
        $response["error"] = true;
        $response["message"] = "Failed to add prediction!";
    }
   // echo json response
echo json_encode($response);
}
createNewPrediction();
?>

这是我的Logcat错误响应： 

03-22 22:59:11.239 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err: org.apache.http.conn.HttpHostConnectException: Connection to http://127.0.0.1 refused
03-22 22:59:11.239 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:193)
03-22 22:59:11.239 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:169)
03-22 22:59:11.240 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:124)
03-22 22:59:11.240 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:366)
03-22 22:59:11.240 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:560)
03-22 22:59:11.240 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:492)
03-22 22:59:11.240 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:470)
03-22 22:59:11.276 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at com.example.muralivss.tjson2_predictionactivity.ServiceHandler.makeServiceCall(ServiceHandler.java:56)
03-22 22:59:11.277 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at com.example.muralivss.tjson2_predictionactivity.PredictionActivity$AddNewPrediction.doInBackground(PredictionActivity.java:143)
03-22 22:59:11.277 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at com.example.muralivss.tjson2_predictionactivity.PredictionActivity$AddNewPrediction.doInBackground(PredictionActivity.java:120)
03-22 22:59:11.278 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
03-22 22:59:11.278 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-22 22:59:11.603 3194-3200/com.example.muralivss.tjson2_predictionactivity W/art: Suspending all threads took: 39.124ms
03-22 22:59:12.196 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
03-22 22:59:12.197 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
03-22 22:59:12.197 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
03-22 22:59:12.197 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.lang.Thread.run(Thread.java:818)
03-22 22:59:12.197 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err: Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 80): connect failed: ECONNREFUSED (Connection refused)
03-22 22:59:12.197 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:124)
03-22 22:59:12.197 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
03-22 22:59:12.198 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)
03-22 22:59:12.198 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at java.net.Socket.connect(Socket.java:884)
03-22 22:59:12.198 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:124)
03-22 22:59:12.198 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:149)
03-22 22:59:12.198 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:  ... 15 more
03-22 22:59:12.198 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err: Caused by: android.system.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
03-22 22:59:12.199 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at libcore.io.Posix.connect(Native Method)
03-22 22:59:12.199 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
03-22 22:59:12.199 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
03-22 22:59:12.199 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:122)
03-22 22:59:12.199 3194-3270/com.example.muralivss.tjson2_predictionactivity W/System.err:  ... 20 more
03-22 22:59:12.199 3194-3270/com.example.muralivss.tjson2_predictionactivity E/Buffer Error: Error: java.lang.NullPointerException: lock == null
03-22 22:59:12.200 3194-3270/com.example.muralivss.tjson2_predictionactivity D/Create Prediction Request:: > null
03-22 22:59:12.205 3194-3270/com.example.muralivss.tjson2_predictionactivity E/JSON Data: JSON data error!
03-22 22:59:31.554 3194-3200/com.example.muralivss.tjson2_predictionactivity W/art: Suspending all threads took: 14.009ms

提供的任何解决方案将不胜感激。

2 个解决方案

解决方案1
 0  2016-03-22 11:08:23

尝试在使用后关闭您的BufferedReader实例：

除此之外，它看起来还不错。 还尝试调试逐行断点，以准确查看错误的出处。

解决方案2
 0  2016-03-22 11:54:21

  1. HttpClient现在已弃用。 在此处检查更新http://developer.android.com/about/versions/marshmallow/android-6.0-changes.html

  2. 检查以下链接，以处理android中的httpurlconnection，json。 http://developer.android.com/reference/java/net/HttpURLConnection.html http://developer.android.com/reference/android/util/JsonReader.html

  3. 用于在httpurlconnection Android中处理JSON请求的示例代码http://danielnugent.blogspot.in/2015/06/updated-jsonparser-with.html

  4. 用于在php中获得价值

    $ recValue = file_get_contents（'php：// input'）; $ json = json_decode（$ recValue）; $ valueOne = $ json [“ keyOne”];

有关更多参考，请检查此

http://php.net/manual/zh/function.json-decode.php

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