JSONArray给人异常

-1

Value of type java.lang.String cannot be converted to JSONArray

当试图解析JSON。

JSONParser.java

public class JSONParser { 

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

// constructor 
public JSONParser() { 

} 

// function get json from url 
// by making HTTP POST or GET mehtod 
public JSONArray makeHttpRequest(String url, String method, 
     List<NameValuePair> params) { 

    // Making HTTP request 
    try { 

     // check for request method 
     if(method == "POST"){ 
      // request method is POST 
      // defaultHttpClient 

      System.out.println("in post, url: "+url); 

      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"){ 

      System.out.println("in get, url: "+url); 

      // 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(); 
    } 

    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(); 
    } 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); 
     System.out.println("jArray: "+jArray); 

    } catch (JSONException e) { 
     Log.e("JSON Parser", "Error parsing data " + e.toString()); 
    } 

    // return JSON String 
    return jArray; 

    } 
}

NewsActivity.java

public class NewsActivity extends Activity { 

    ListView newsListView; 

    // Progress Dialog 
    private ProgressDialog pDialog; 

    // Creating JSON Parser object 
    JSONParser jsonParser = new JSONParser(); 

    ArrayList<HashMap<String, String>> newsList; 

    // products JSONArray 
    JSONArray News = null; 

    NewsAdapter newAdapter; 

    ImageButton home; 

    // News JSON url 
    // http://www.giga-soft.com/fredericm_mobile 
    private static final String NEWS_URL = "my_URL.php"; 

    // ALL JSON node names 
    static final String NEWS_ID = "news_id"; 
    static final String NEWS_CONTENT = "news_content"; 
    static final String NEWS_PHOTO = "news_photo"; 
    static final String NEWS_PHOTO_THUMB = "news_photo_thumb"; 
    static final String NEWS_CREATED_DATE = "news_created_date"; 
    static final String NEWS_ORD = "news_ord"; 
    static final String NEWS_STATE = "news_state"; 
    static final String NEWS_LAST_UPDATE = "news_last-update"; 
    static final String NEWS_TITLE = "news_title"; 

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

     newsListView = (ListView)findViewById(R.id.news_list); 
     newsListView.setItemsCanFocus(true); 

     // Hashmap for ListView 
     newsList = new ArrayList<HashMap<String, String>>(); 

     home = (ImageButton) findViewById(R.id.TitleHomeBtn); 

     home.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 

       Intent intent = new Intent(NewsActivity.this, MainActivity.class); 
       startActivity(intent); 

      } 
     }); 

     // Loading News in Background Thread 
     new LoadNews().execute(); 

    } 


    /** 
    * Background Async Task to Load all News messages by making HTTP Request 
    * */ 
    class LoadNews extends AsyncTask<String, String, String> { 

     /** 
     * Before starting background thread Show Progress Dialog 
     * */ 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(NewsActivity.this); 
      pDialog.setMessage(getResources().getString(R.string.loadNews)); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(false); 
      pDialog.show(); 
     } 

     /** 
     * getting News JSON 
     * */ 
     protected String doInBackground(String... args) { 

      // Building Parameters 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 

      // getting JSON string from URL 
      JSONArray jsonArray = jsonParser.makeHttpRequest(NEWS_URL, "GET", params); 

      ///////////////// the following line gives Exception ///////////////////// 
      System.out.println("jsonArray.length(): "+jsonArray.length()); 

      JSONObject jsonObject = null; 


      // Check your log cat for JSON reponse 
      Log.d("News JSON: ", jsonArray.toString()); 

      try { 

       // looping through All messages 
       for (int i = 0; i < jsonArray.length(); i++) { 
        jsonObject = jsonArray.getJSONObject(i); 

        System.out.println("jsonObject: "+jsonObject); 

        // Storing each json item in variable 
        String news_id = jsonObject.getString(NEWS_ID); 
        String news_content = jsonObject.getString(NEWS_CONTENT); 
        String news_photo = jsonObject.getString(NEWS_PHOTO); 
        String news_photo_thumb = jsonObject.getString(NEWS_PHOTO_THUMB); 
        String news_created_date = jsonObject.getString(NEWS_CREATED_DATE); 
        String news_ord = jsonObject.getString(NEWS_ORD); 
        String news_state = jsonObject.getString(NEWS_STATE); 
        String news_last_update = jsonObject.getString(NEWS_LAST_UPDATE); 
        String news_title = jsonObject.getString(NEWS_TITLE); 

        // creating new HashMap 
        HashMap<String, String> map = new HashMap<String, String>(); 

        // adding each child node to HashMap key => value 
        map.put(NEWS_ID, news_id); 
        map.put(NEWS_CONTENT, news_content); 
        map.put(NEWS_PHOTO, news_photo); 
        map.put(NEWS_PHOTO_THUMB, news_photo_thumb); 
        map.put(NEWS_CREATED_DATE, news_created_date); 
        map.put(NEWS_ORD, news_ord); 
        map.put(NEWS_STATE, news_state); 
        map.put(NEWS_LAST_UPDATE, news_last_update); 
        map.put(NEWS_TITLE, news_title); 

        // adding HashList to ArrayList 
        newsList.add(map); 
       } 

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

      return null; 
     } 

     /** 
     * After completing background task Dismiss the progress dialog 
     * **/ 
     protected void onPostExecute(String file_url) { 
      // dismiss the dialog after getting all products 
      pDialog.dismiss(); 
      // updating UI from Background Thread 
      runOnUiThread(new Runnable() { 
       public void run() { 
        /** 
        * Updating parsed JSON data into ListView 
        * */ 
        newAdapter = new NewsAdapter(NewsActivity.this, newsList); 
        // updating listview 
        newsListView.setAdapter(newAdapter); 

       } 
      }); 

     } 

    } 

}

在PHP文件：

<?php 
include ('config.php'); 

mysql_query('SET CHARACTER SET UTF8'); 
mysql_query("SET NAMES utf8; "); 

$check = mysql_query("SELECT * FROM news WHERE 1"); 

while($row=mysql_fetch_assoc($check)) 
$output[]=$row; 

    $json_encode =json_encode($output); 
    $utf8_decode = utf8_decode($json_encode); 
    echo $json_encode; 
    mb_convert_encoding($json_encode, 'UTF-8'); 
    $html_entity_decode = html_entity_decode($json_encode); 

mysql_close();

PHP鳕鱼e：

?[ 
     { 
     "news_id": "11", 
     "news_content": "\u0639\u0637\u0648\u0631 \u0628\u0623\u062e\u0641 \u0627\u0644\u0627\u062d\u062c\u0627\u0645 \u062a\u0635\u0644\u062d \u0644\u062c\u0645\u064a\u0639 \u0627\u0644\u0627\u0633\u062a\u0639\u0645\u0627\u0644\u0627\u062a \u0627\u0644\u064a\u0648\u0645\u064a\u0629.. \u0648\u062a\u0624\u062e\u0630 \u0627\u0644\u0649 \u0627\u064a \u0645\u0643\u0627\u0646 \u0648\u062a\u0648\u0636\u0639 \u0641\u064a \u0627\u064a \u0645\u0643\u0627\u0646 \u0628\u0633\u0647\u0648\u0644\u0629 .. \u0628\u0627\u0644\u0627\u0636\u0627\u0641\u0629 \u0627\u0644\u0649 \u0639\u0637\u0631\u0647\u0627 \u0627\u0644\u062e\u0644\u0627\u0628", 
     "news_photo": "http:\/\/www.abarid.com\/Mobile_apps\/products_thumb\/Untitled6.png", 
     "news_photo_thumb": "", 
     "news_internal_photo": "http:\/\/www.abarid.com\/Mobile_apps\/products_thumb\/Untitled6.png", 
     "news_photo_internal_thumb": "", 
     "news_created_date": "2013-10-31", 
     "news_ord": "1", 
     "news_state": "1", 
     "news_last-update": "2013-11-13 23:20:39", 
     "news_title": "Pocket Perfums" 
     }, 
     { 
     "news_id": "12", 
     "news_content": "\u0627\u0644\u0637\u0628\u064a\u0639\u0629 \u062f\u0627\u0626\u0645\u0627 \u0627\u0641\u0636\u0644.. \u0645\u0645\u064a\u0632\u0627\u062a \u0627\u0644\u0645\u0643\u064a\u0627\u062c \u0627\u0644\u0645\u0639\u062f\u0646\u0649\n\u0628\u0648\u062f\u0631\u0629 \u062f\u0642\u064a\u0642\u0629 \u0644\u0627 \u062a\u0633\u062f \u0645\u0633\u0627\u0645 \u0627\u0644\u062c\u0644\u062f \u0648 \u062a\u0633\u0627\u0639\u062f \u0627\u0644\u062c\u0644\u062f \u0639\u0644\u0649 \u0627\u0644\u062a\u0646\u0641\u0633\n\u0645\u062b\u0627\u0644\u064a\u0629 \u0644\u0644\u062c\u0644\u062f \u0627\u0644\u062d\u0633\u0627\u0633 \u0627\u0648 \u0627\u0644\u0645\u062a\u0636\u0631\u0631 - \u0645\u0627\u0646\u0639 \u0637\u0628\u064a\u0639\u0649 \u0636\u062f \u0627\u0634\u0639\u0629 \u0627\u0644\u0634\u0645\u0633 \u0627\u0644\u0636\u0627\u0631\u0629", 
     "news_photo": "http:\/\/www.abarid.com\/Mobile_apps\/products_thumb\/Untitled8.png", 
     "news_photo_thumb": "", 
     "news_internal_photo": "http:\/\/www.abarid.com\/Mobile_apps\/products_thumb\/Untitled8.png", 
     "news_photo_internal_thumb": "", 
     "news_created_date": "2013-10-31", 
     "news_ord": "2", 
     "news_state": "1", 
     "news_last-update": "2013-11-13 23:20:45", 
     "news_title": "\u0627\u0644\u0645\u0643\u064a\u0627\u062c \u0627\u0644\u0645\u0639\u062f\u0646\u064a" 
     }, 
     { 
     "news_id": "13", 
     "news_content": "\u0644\u0627\u0637\u0644\u0627\u0644\u0629 \u0645\u062a\u0645\u064a\u0632\u0629 \u0648\u0627\u0646\u064a\u0642\u0629 \u062a\u062a\u0645\u064a\u0632 \u0628\u0631\u0642\u0629 \u0627\u0644\u062a\u0635\u0645\u064a\u0645 ", 
     "news_photo": "http:\/\/www.abarid.com\/Mobile_apps\/products_thumb\/Untitled9.jpeg", 
     "news_photo_thumb": "http:\/\/www.abarid.com\/Mobile_apps\/products_thumb\/Untitled9.jpeg", 
     "news_internal_photo": "", 
     "news_photo_internal_thumb": "", 
     "news_created_date": "2013-12-30", 
     "news_ord": "3", 
     "news_state": "1", 
     "news_last-update": "2014-02-21 01:47:15", 
     "news_title": "\u0633\u0648\u0627\u0631 \u0627\u0644\u0631\u062c\u0644 \u0627\u0644\u0645\u062a\u0645\u064a\u0632" 
     }, 
     { 
     "news_id": "14", 
     "news_content": "\u0639\u0631\u0636 \u0631\u0627\u0626\u0639 \u0645\u0646 \u0641\u0631\u064a\u062f\u0631\u064a\u0643 \u0627\u0645", 
     "news_photo": "http:\/\/www.giga-soft.com\/fredericm\/uploads\/152488.png?r=169902398", 
     "news_photo_thumb": "http:\/\/www.giga-soft.com\/fredericm\/uploads\/152488_thumb.png?r=169902398", 
     "news_internal_photo": "", 
     "news_photo_internal_thumb": "", 
     "news_created_date": "2013-12-31", 
     "news_ord": "4", 
     "news_state": "1", 
     "news_last-update": "2013-12-31 17:09:10", 
     "news_title": "\u0627\u0633\u0648\u0631\u0629 \u0642\u0644\u0628 \u0627\u0644\u064a\u0627\u0642\u0648\u062a" 
     } 
    ]

什么问题导致异常和如何解决？希望任何人都可以帮助我。

来源

2014-09-23 Eman87

你可以发布你的json吗？ – praveen 2014-09-23 09:58:02

错误反映的是什么？通常当人们得到这个错误时，这是因为他们认为他们从服务器上获得了一个JSON对象，但实际上，他们得到了一个像JSON那样看起来不像是JSON的String。 – erad 2014-09-23 09:58:13

发布您的JSON和JSONException – 2014-09-23 10:02:06

您是否检查了传递给JSONArray的值，是否按照您的预期？您的问题是可能重复的Value of type java.lang.String cannot be converted to JSONArray

来源

2014-09-23 10:05:43 praveen

您应该为您的HttpPost添加setContent("application/json")以确保它会收到一个JSON对象。

请参阅documentation。

来源

2014-09-23 10:07:35 erad

public class JSONParser { 

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

    public ServiceHandler() { 

    } 

    /** 
    * Making service call 
    * @url - url to make request 
    * @method - http request method 
    * */ 
    public String makeServiceCall(String url, int method) { 
     return this.makeServiceCall(url, method, null); 
    } 

    /** 
    * Making service call 
    * @url - url to make request 
    * @method - http request method 
    * @params - http request params 
    * */ 
    public String makeServiceCall(String url, int method, 
      List<NameValuePair> params) { 
     try { 
      // http client 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpEntity httpEntity = null; 
      HttpResponse httpResponse = null; 

      // Checking http request method type 
      if (method == POST) { 
       HttpPost httpPost = new HttpPost(url); 
       // adding post params 
       if (params != null) { 
        httpPost.setEntity(new UrlEncodedFormEntity(params)); 
       } 

       httpResponse = httpClient.execute(httpPost); 

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

       httpResponse = httpClient.execute(httpGet); 

      } 
      System.out.println("Status in url =====" + httpResponse.getStatusLine().getStatusCode()); 
      httpEntity = httpResponse.getEntity(); 
      response = EntityUtils.toString(httpEntity); 

     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     return response; 

    } 
}

来源

2014-09-23 10:17:15

JSONArray给人异常

回答

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