有效的JSON字符串抛出异常变量为空的JSONException

Question

我的系统基于android客户端和wcf - rest - web服务。我正在使用这个教程：http://fszlin.dymetis.com/post/2010/05/10/Comsuming-WCF-Services-With-Android.aspx我遇到了一个奇怪的问题。我有一个有效的JSON字符串(用在线工具检查过)，对缓冲区的读取正常，但当我试图创建一个JSON数组时，它抛出了JSONException而没有异常变量(该变量为NULL --我以前从未遇到过)抛出异常的代码行：

    request.setHeader("Accept", "application/json");
            request.setHeader("Content-type", "application/json");

            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpResponse response = httpClient.execute(request);

            HttpEntity responseEntity = response.getEntity();

            // Read response data into buffer
            char[] buffer = new char[(int)responseEntity.getContentLength()];
            InputStream stream = responseEntity.getContent();
            InputStreamReader reader = new InputStreamReader(stream);
            reader.read(buffer);
            stream.close();

            JSONArray plates = new JSONArray(new String(buffer));

最后一行抛出异常。

来自该服务的文本如下：{"dtFromDate":"1899-12-30 20:00:00"，"fBuyWindow":120，"fNewPrice":150，"fOldPrice":400，"lLatitude":32.021327，"lLongitude":34.776452，"nDestinatedPlatform":1，"nMessageID":1，"nRange":5，"nStickingHours":48，“strDetailedDescription”：“נעלינייקמסוגN95，חולון.”，“strDisplayAddress”：“נעלינייקמסוג49，הנעלייםשללאונלמסי，בהנחהמטורפת”，“strFullAddress”：“strItemDescrpition 49，חנקין”，חולון，ישראל“strItemDescrpition”：“נעלינייקדגםN95לבן"，"strThumbPath":"http://images.free-extras.com/pics/n/nike_swoosh-703.jpg"，”strTitle“：”נעלינייקדגם“}，{”fBuyWindow“：”1899-12-30 20:00:00"，“נייקקניוןחולון”：120，"fNewPrice":150，"fOldPrice":400，"lLatitude":32.021327，"lLongitude":34.776452，"nDestinatedPlatform":1，"nMessageID":2，"nRange":5，"nStickingHours":48，“strDetailedDescription”：“N95，חולון，ישראל.”，"strDisplayAddress":""，"strFullAddress":"חנקין49，חולון，ישראל“，"strImagePath":""，”strItemDescrpition“：”נעלינייקדגםN95לבן"，"strThumbPath":""，“strTitle”："lLatitude":32.021327，"lLongitude":34.776452，"nDestinatedPlatform":1，"nMessageID":3，"nRange":5，"nStickingHours":48，“strDetailedDescription”：“N95，הנעלייםשללאונלמסי，בהנחהמטורפת.”，“strFullAddress”：“1899-12-30 20:00:00"，"fBuyWindow":120，"fNewPrice":150，"fOldPrice":400，"lLatitude":32.021327，"lLongitude":34.776452，"nDestinatedPlatform":1，"nMessageID":4，”חנקיןlLongitude“：34.776452，”nDestinatedPlatform“：1，”נייקקניוןחולון“}，"nRange":5，"nStickingHours":48，“strDetailedDescription”：“strImagePath，הנעלייםשללאונלמסי，בהנחהמטורפת.”，"strDisplayAddress":""，“strFullAddress”：“נעלינייקמסוג49，הנעלייםשללאונלמסי，בהנחהמטורפת”，“N95”：“”，“strThumbPath”：“strTitle”：“נייקקניוןחולון”}，{"dtFromDate":"1899-12-30 20:00:00"，"fBuyWindow":120，"fNewPrice":150，“נעלינייקמסוגN95חולון，ישראל”，“נעלינייקדגםנייקקניוןחולון”：150，"fOldPrice":400，"lLatitude":32.021327，"lLongitude":34.776452，"nDestinatedPlatform":1，"nMessageID":5，"nRange":5，"nStickingHours":48，“strDetailedDescription”：“N95，חולון，ישראל.”，"strDisplayAddress":""，“strFullAddress”：“strImagePath 49，הנעלייםשללאונלמסי，בהנחהמטורפת”，“N95”：“”，“strThumbPath”：“נעלינייקמסוגחנקיןחולון，ישראל”，“”，“strTitle”：“נייקקניוןחולון”}

有什么建议吗？

谢谢。

Answer 1

尝试以下操作。

更改此行...

char[] buffer = new char[(int)responseEntity.getContentLength()];

...to使用字节数组，如下所示...

byte[] buffer = new byte[(int)responseEntity.getContentLength()];

你必须忘记使用InputStreamReader，因为它只适用于char[]。取而代之的是使用...

stream.read(buffer);

然后更改这一行。

JSONArray plates = new JSONArray(new String(buffer));

...to this以创建一个UTF8编码字符串...

JSONArray plates = new JSONArray(new String(buffer, "UTF-8"));

Answer 2

我建议这样做：

String newString = reader.read(buffer); //assuming you only get one line in response, rather than many (add a loop if so)
JSONArray plates = new JSONArray(newString);

这可能会有所帮助。另外，下面是我使用JSONArray编写的一些与JSON相关的代码：

public JSONArray getQuestionsJSONFromUrl(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);
        String jsonData = reader.readLine();
        JSONArray jarr = new JSONArray(jsonData);
        is.close();
        return jarr;
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }
    return null;
}