Question

我有一个Json数据，我从wordpress博客获得，当我尝试传递url时，我在logcat中收到此错误，说明 org.json.JSONException：没有评论值。 < / p>

我想要做的是从wordpress博客中检索提交。

我已粘贴完整代码here以供进一步参考，

03-13 11:43:59.698: W/System.err(18926): org.json.JSONException: No value for comments
03-13 11:43:59.698: W/System.err(18926):    at org.json.JSONObject.get(JSONObject.java:354)
03-13 11:43:59.698: W/System.err(18926):    at org.json.JSONObject.getJSONArray(JSONObject.java:544)
03-13 11:43:59.698: W/System.err(18926):    at com.cepfmobileapp.org.CommentActivityWp$GetQuery.doInBackground(CommentActivityWp.java:271)
03-13 11:43:59.698: W/System.err(18926):    at com.cepfmobileapp.org.CommentActivityWp$GetQuery.doInBackground(CommentActivityWp.java:1)
03-13 11:43:59.698: W/System.err(18926):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-13 11:43:59.698: W/System.err(18926):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-13 11:43:59.698: W/System.err(18926):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-13 11:43:59.708: W/System.err(18926):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-13 11:43:59.708: W/System.err(18926):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-13 11:43:59.708: W/System.err(18926):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-13 11:43:59.708: W/System.err(18926):    at java.lang.Thread.run(Thread.java:856)

Java代码

    private static final String TAG_COMMENTS = "comments";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_CONTENT = "content";


    Intent i = getIntent();
    // Receiving the Data
    ida = i.getStringExtra("id");
    url = "" + ida;


    @Override
    protected Void doInBackground(Void... arg0) {
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

        Log.d("Response: ", "> " + jsonStr);

        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                comments = jsonObj.getJSONArray(TAG_COMMENTS);

                // looping through All Contacts
                for (int i = 0; i < comments.length(); i++) {
                    JSONObject c = comments.getJSONObject(i);


                    // Phone node is JSON Object
                     //JSONObject comments = c.getJSONObject(TAG_COMMENTS );
                     String id = c.getString(TAG_ID);
                     String name = c.getString(TAG_NAME);
                     String content = c.getString(TAG_CONTENT);

                    // tmp hashmap for single contact
                    HashMap<String, String> contact = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    contact.put(TAG_ID, id);
                    contact.put(TAG_NAME, name);
                    contact.put(TAG_CONTENT, content);


                    // adding contact to contact list
                    queryList.add(contact);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }

Answer 1

Ty this ..

您的回复中的JSONArray中没有comments，您必须与jsonObj.has(TAG_CONTENT)检查TAG名称是否存在。

JSONObject  jsonpost= jsonObj.getJSONObject("post");
if(jsonpost.has(TAG_ID)){

    comments = jsonpost.getJSONArray(TAG_COMMENTS);

    for (int i = 0; i < comments.length(); i++) {   

    String id = "";
    String name = "";
    String content = "";

    if(c.has(TAG_ID))
       id = c.getString(TAG_ID);

    if(c.has(TAG_NAME))
      name = c.getString(TAG_NAME);

    if(c.has(TAG_CONTENT))
       content = c.getString(TAG_CONTENT);
    }
}

Answer 2

试试如下：

     try {
            JSONObject jsonObj = new JSONObject(jsonStr);

            // Getting JSON Array node
            comments = jsonObj.getJSONArray("posts");

            // looping through All Contacts
            for (int i = 0; i < comments.length(); i++) {
                JSONObject c = comments.getJSONObject(i);

                //get the comments arraylist
                 JSONArray commentsdata = c.getJSONArray(TAG_COMMENTS);
                      for (int j = 0; j < commentsdata.length(); j++) 
                        {
                            JSONObject comntObj = commentsdata.getJSONObject(j);
                          String name = comntObj.getString("name");
                          String sUrl = comntObj.getString("url");
                           String scontent = comntObj.getString("content");
                        ....................

                       }
                  String id = c.getString(TAG_ID);
                 String content = c.getString(TAG_CONTENT);
                // tmp hashmap for single contact
                HashMap<String, String> contact = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                contact.put(TAG_ID, id);
                contact.put(TAG_NAME, name);
                contact.put(TAG_CONTENT, content);


                // adding contact to contact list
                queryList.add(contact);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

Answer 3

            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                JSONObject  jsonpost= jsonObj.getJSONObject("post");

                // looping through All Contacts
                for (int i = 0; i < jsonpost.length(); i++) {

                    JSONObject c = jsonpost.getJSONObject(i);

                     JsonArray comments=c.getJSONArray("comments");
                    for (int j = 0; j< comments.size();j++) {
                        JSONObject jj = comments.getJSONObject(j);

                     String id = jj.getString(TAG_ID);
                     String name = jj.getString(TAG_NAME);
                     String content = jj.getString(TAG_CONTENT);

                    // tmp hashmap for single contact
                    HashMap<String, String> contact = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    contact.put(TAG_ID, id);
                    contact.put(TAG_NAME, name);
                    contact.put(TAG_CONTENT, content);


                    // adding contact to contact list
                    queryList.add(contact);
                }
            }

我希望它对你有用..

Answer 4

try{
    JSONObject jsonObj = new JSONObject(jsonStr);

    JSONObject  jsonpost= jsonObj.getJSONObject("post");
    comments = jsonpost.getJSONArray("comments");
    ...........................................
    //your rest codes//
}

您的comments是post JSONObject内的JSONArray。因此，您需要从comments JSONObject访问post。

org.json.JSONException：没有评论值

4 个答案: