11

このような JSON 文字列を解析しようとしています ( http://www.json-generator.comで生成された URL )

{
"total": 86, 
"jsonrpc": "2.0", 
"id": 1, 
"result": [
    {
        "startDate": "14/03/2012", 
        "meetingId": "1330", 
        "creator": "Jhon", 
        "lastModified": "02/04/2012", 
        "meetingTitle": "task clarification", 
        "location": "Conf hall", 
        "startTime": "02:00 PM", 
        "createdDate": "14/03/2012", 
        "owner": "Peter", 
        "endTime": "02:30 PM"
    }, 
    {
        "startDate": "20/03/2012", 
        "meetingId": "1396", 
        "creator": "Mr.Hobbs", 
        "lastModified": "07/09/2012", 
        "meetingTitle": "Design Work", 
        "location": "South conf Room", 
        "startTime": "03:30 PM", 
        "createdDate": "19/03/2012", 
        "owner": "Steve Jobs", 
        "endTime": "04:30 PM"
    }, 
    {
        "startDate": "22/03/2012", 
        "meetingId": "1432", 
        "creator": "Robin", 
        "lastModified": "21/03/2012", 
        "meetingTitle": "Do something new", 
        "location": "NA", 
        "startTime": "10:00 AM", 
        "createdDate": "21/03/2012", 
        "owner": "Mr.Bean", 
        "endTime": "11:00 AM"
    }
  ]

}

私が使用しているオブジェクトクラスは次のとおりです。

public class Country {

String startDate;
 String meetingId;
 String creator;
 String lastModified;
 String meetingTitle;
 String location;
 String startTime;
 String createdDate;
 String owner;
 String endTime;

 public String getStartDate() {
    return startDate;
}
public void setStartDate(String startDate) {
    this.startDate = startDate;
}
public String getMeetingId() {
    return meetingId;
}
public void setMeetingId(String meetingId) {
    this.meetingId = meetingId;
}
public String getCreator() {
    return creator;
}
public void setCreator(String creator) {
    this.creator = creator;
}
public String getLastModified() {
    return lastModified;
}
public void setLastModified(String lastModified) {
    this.lastModified = lastModified;
}
public String getMeetingTitle() {
    return meetingTitle;
}
public void setMeetingTitle(String meetingTitle) {
    this.meetingTitle = meetingTitle;
}
public String getLocation() {
    return location;
}
public void setLocation(String location) {
    this.location = location;
}
public String getStartTime() {
    return startTime;
}
public void setStartTime(String startTime) {
    this.startTime = startTime;
}
public String getCreatedDate() {
    return createdDate;
}
public void setCreatedDate(String createdDate) {
    this.createdDate = createdDate;
}
public String getOwner() {
    return owner;
}
public void setOwner(String owner) {
    this.owner = owner;
}
public String getEndTime() {
    return endTime;
}
public void setEndTime(String endTime) {
    this.endTime = endTime;
}




}

しかし、それは私を投げます:

     W/JSONStreamReader(1153): java.lang.IllegalStateException: Expected a name but was NUMBER at line 1 column 8
08-09 01:21:37.629: W/JSONStreamReader(1153): java.lang.IllegalStateException: Expected a name but was NUMBER at line 1 column 8
08-09 01:21:37.629: W/JSONStreamReader(1153):   at com.google.gson.stream.JsonReader.nextName(JsonReader.java:785)
08-09 01:21:37.629: W/JSONStreamReader(1153):   at com.example.gsontest.MainActivity$MyAsyncTask.doInBackground(MainActivity.java:162)

Json "id": 1 では、数字です! それが理由ですか？http://www.json-generator.comで JSON を生成しています

Jsonを解析するための私のAyscコード:

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

        private static final int REGISTRATION_TIMEOUT = 3 * 1000;
        private static final int WAIT_TIMEOUT = 30 * 1000;
        private final HttpClient httpclient = new DefaultHttpClient();

        final HttpParams params = httpclient.getParams();
        private boolean error = false;

        protected Void doInBackground(String... urls) {

            String URL = null;
            Log.d("ConnManagerParams", "ok?");
            try {

                // URL passed to the AsyncTask
                URL = urls[0];
                HttpConnectionParams.setConnectionTimeout(params,
                        REGISTRATION_TIMEOUT);
                HttpConnectionParams.setSoTimeout(params, WAIT_TIMEOUT);
                ConnManagerParams.setTimeout(params, WAIT_TIMEOUT);

                Log.d("ConnManagerParams", "ok?");
                HttpPost httpPost = new HttpPost(URL);
                Log.d("httpPost", "ok?");
                // Response from the Http Request
                HttpResponse response = httpclient.execute(httpPost);
                Log.d("response", "ok?");
                // Check the Http Request for success
                StatusLine statusLine = response.getStatusLine();
                Log.d("statusLine", response.getStatusLine().toString());
                // Log.d("RESPONSE",
                // EntityUtils.toString(response.getEntity()));

                if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
                    // Log.d("statusok", statusLine.getStatusCode());
                    Gson gson = new Gson();
                    // create a new JSON reader from the response input stream
                    Log.d("gson", "gson?");
                    JsonReader jsonReader = new JsonReader(
                            new InputStreamReader(response.getEntity()
                                    .getContent(), "UTF-8"));
                    // begin parsing
                    Log.d("AFTjsonReader", "AFTjsonReader?");
                    jsonReader.beginObject();
                    Log.d("beginObject", "beginObject?");
                    // stay in loop as long as there are more data elements
                    while (jsonReader.hasNext()) {
                        // get the element name
                        Log.d("whilejsonReader", "whilejsonReader?");
                        // String name = jsonReader.nextName();
                        Log.d("nextName", jsonReader.nextName());
                        String name = jsonReader.nextName();

                        Log.d("nextNametest2", "nextName?");

                        if (name.equals("result")) {

                            Log.d("result", "result?");
                            jsonReader.beginArray();

                            while (jsonReader.hasNext()) {
                                // parse every element and convert that to a
                                // country object
                                Country country = gson.fromJson(jsonReader,
                                        Country.class);
                                // add the country object to the list
                                countryList.add(country);

                            }
                            jsonReader.endArray();
                        }

                        // success = jsonReader.nextBoolean();
                        success = true;

                    }
                    // end reader and close the stream
                    jsonReader.endObject();
                    jsonReader.close();

                } else {
                    // Closes the connection.
                    Log.d("Closes the connection.", "Closes the connection.?");
                    Log.w(LOG_TAG, statusLine.getReasonPhrase());
                    response.getEntity().getContent().close();
                    throw new IOException(statusLine.getReasonPhrase());
                }

            } catch (Exception e) {
                Log.d("catch", "catch");
                Log.w(LOG_TAG, e);

                error = true;
                cancel(true);
            }

            return null;

        }

        protected void onCancelled() {
            Log.e(LOG_TAG, "Error occured during data download");
        }

        protected void onPostExecute(Void unused) {
            if (error) {
                Log.e(LOG_TAG, "Data download ended abnormally!");
            } else {
                displayCountries();
            }
        }

    }

}

どのように修正すればよいですか？

ありがとう！

4

3 に答える 3

3

ストリームを手動で使用JsonReaderおよび解析する場合は、 による自動逆シリアル化を使用しませんGson.fromJson()。

ループに入ったら、その配列をトラバースしながら各オブジェクトからフィールドを抽出するか、適切なクラスで自動逆シリアル化を使用する必要があります（正直なところ、これはあなたがすべきことです）：

class Response {
    private int total;
    private String jsonrpc;
    private int id;
    private List<Country> result;

   // getters and setters ...
}

そして簡単に：

InputStreamReader isr = new InputStreamReader(response.getEntity()
                                .getContent(), "UTF-8"));
Response r = gson.fromJson(isr, Response.class);
于 2013-08-09T17:35:39.140 に答える
2

私も同じ問題に直面しています。問題は、jsonReader.nextName() を取得している場合のすべての条件であることがわかりました。それは正しい方法ではありません。あなたも同じようにしていると思います。

コードから、これらの 2 行が問題を引き起こします。

  // here the jsonReader moving one step.
  Log.d("nextName", jsonReader.nextName());

  //again your trying to getting the "jsonReader.nextName()" it is wrong in the above line already you got the name and reader move to next line. So  Exception may be comes here.                                    
   String name = jsonReader.nextName();

"jsonReader.nextName()" は while ループの繰り返しごとに 1 回だけ使用する必要があります。 

 while (reader.hasNext())
 {

            String name=reader.nextName();
            if(name.equals(Constants.AUTH)){
                authDetails.setAuth(reader.nextString());

            }else if(name.equals(Constants.STATUS)){
                authDetails.setStatus(reader.nextInt());
            }else if(name.equals(Constants.MESSAGE)){
                authDetails.setMessage(reader.nextString());
            }else {
                reader.skipValue();
            }

    }
于 2016-07-21T11:54:16.147 に答える