Question

我有这样一个奇怪的错误：我试图从网址解析json对象。这是完美的，例如这是json数据：

{"type":"result","rid":"djoezradio",
"data":[{
"title":"Webradio",
 "song":"Test",
 "track":{
 "artist":"Test",
 "title":"Test",
 "album":"",
 "Test":422,
 "id":423,
 "playlist":{
 "id":14,"title":"reggae"
 },
 "imageurl":"http:\/\/example.com\/static\/example\/covers\/nocover.png"},
 "bitrate":"128 Kbps",
 "server":"Online","autodj":"Online","source":"Yes","offline":false","listeners":1,
 "maxlisteners":500,"reseller":0,"serverstate":true,"sourcestate":true,
 "sourceconn":true,"date":"Dec 14, 2013",
 "time":"02:13   PM","url":"http:\/\/example.com\/"}]}

这是我的代码：

HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet();
    request.setURI(new URI("http://example.com"));
    HttpResponse response;
    try {
        response = client.execute(request);
        BufferedReader in = new BufferedReader(new InputStreamReader(response
                .getEntity().getContent()));
        String line = "";

        while ((line = in.readLine()) != null) {

            JSONObject jObject = new JSONObject(line);


                String temp = jObject.getString("imageurl");
                Log.e("rid",temp);


        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

例如，当我执行getString（“播放列表”）时，它运行良好，它将返回id：14等。唯一不起作用的是物体图像...... 当我想解析它时，它只返回null，而它就在那里！

有什么想法吗？有什么理由吗？因为它是一个.jpeg？请求分享，我真的卡住了。

Answer 1

试试这个。

HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI("http://example.com"));
HttpResponse response;
try {
    response = client.execute(request);
    BufferedReader in = new BufferedReader(new InputStreamReader(response
            .getEntity().getContent()));

StringBuilder builder = new StringBuilder();
String line;
while((line=in.readLine())!=null)
{

    builder.append(line);
}
String JSONdata = builder.toString();
Log.i("JsonData",JSONdata);

JSONObject jObject = new JSONObject(JSONdata);


String temp = jObject.getString("imageurl");
Log.e("rid",temp);

} catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

修改

JSONObject jObject = new JSONObject(JSONdata); JSONArray jdata = jObject.getJSONArray("data"); JSONObject job = jdata.getJSONObject(0); JSONObject jObjt = job.getJSONObject("track"); String temp = jObjt.getString("imageurl"); Log.e("rid",temp);

奇怪的json nullpointer

1 个答案: