android读取服务器json格式数据_android 获取服务器json文件-优快云博客

本文链接：https://blog.youkuaiyun.com/zhiyi2010/article/details/6589970

这篇博客详细介绍了如何在Android应用中从服务器获取JSON格式的数据，并进行解析操作。通过示例代码展示了如何处理可能出现的异常，以及如何将接收到的数据转化为可操作的对象。

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带数组形式的：
服务器端返回的数据格式为：

{"calendar": 
    {"calendarlist": 
            [ 
            {"calendar_id":"1705","title":"(\u4eb2\u5b50)ddssd","category_name":"\u9ed8\u8ba4\u5206\u7c7b","showtime":"1288927800","endshowtime":"1288931400","allDay":false}, 
            {"calendar_id":"1706","title":"(\u65c5\u884c)","category_name":"\u9ed8\u8ba4\u5206\u7c7b","showtime":"1288933200","endshowtime":"1288936800","allDay":false} 
            ] 
    } 
}

public class ParseJSON extends Activity {

23    /** Called when the activity is first created. */

24    @Override

25    public void onCreate(Bundle savedInstanceState) {

26        super.onCreate(savedInstanceState);

27        setContentView(R.layout.main);

28        String readTwitterFeed = readTwitterFeed();

29        try {

30            JSONArray jsonArray = new JSONArray(readTwitterFeed);

31            Log.i(ParseJSON.class.getName(),

32                    "Number of entries " + jsonArray.length());

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

34                JSONObject jsonObject = jsonArray.getJSONObject(i);

35                Log.i(ParseJSON.class.getName(), jsonObject.getString("text"));

36            }

37        } catch (Exception e) {

38            e.printStackTrace();

39        }

40    }

41

42    public String readTwitterFeed() {

43        StringBuilder builder = new StringBuilder();

44        HttpClient client = new DefaultHttpClient();

45        HttpGet httpGet = new HttpGet(

46                "http://twitter.com/statuses/user_timeline/vogella.json");

47        try {

48            HttpResponse response = client.execute(httpGet);

49            StatusLine statusLine = response.getStatusLine();

50            int statusCode = statusLine.getStatusCode();

51            if (statusCode == 200) {

52                HttpEntity entity = response.getEntity();

53                InputStream content = entity.getContent();

54                BufferedReader reader = new BufferedReader(

55                        new InputStreamReader(content));

56                String line;

57                while ((line = reader.readLine()) != null) {

58                    builder.append(line);

59                }

60            } else {

61                Log.e(ParseJSON.class.toString(), "Failed to download file");

62            }

63        } catch (ClientProtocolException e) {

64            e.printStackTrace();

65        } catch (IOException e) {

66            e.printStackTrace();

67        }

68        return builder.toString();

69    }

70}

[代码] 生成 JSON01public void writeJSON() {
02    JSONObject object = new JSONObject();
03    try {
04        object.put("name", "Jack Hack");
05        object.put("score", new Integer(200));
06        object.put("current", new Double(152.32));
07        object.put("nickname", "Hacker");
08    } catch (JSONException e) {
09        e.printStackTrace();
10    }
11    System.out.println(object);
12}

json数据格式解析我自己分为两种；

一种是普通的，一种是带有数组形式的；


 

普通形式的：
服务器端返回的json数据格式如下：

{"userbean":{"Uid":"100196","Showname":"\u75af\u72c2\u7684\u7334\u5b50","Avtar":null,"State":1}}

分析代码如下：

// TODO 状态处理 500 200 
                int res = 0; 
                res = httpClient.execute(httpPost).getStatusLine().getStatusCode(); 
                if (res == 200) { 
                    /* 
                     * 当返回码为200时，做处理 
                     * 得到服务器端返回json数据，并做处理 
                     * */ 
                    HttpResponse httpResponse = httpClient.execute(httpPost); 
                    StringBuilder builder = new StringBuilder(); 
                    BufferedReader bufferedReader2 = new BufferedReader( 
                            new InputStreamReader(httpResponse.getEntity().getContent())); 
                    String str2 = ""; 
                    for (String s = bufferedReader2.readLine(); s != null; s = bufferedReader2 
                            .readLine()) { 
                        builder.append(s); 
                    } 
                    Log.i("cat", ">>>>>>" + builder.toString());

JSONObject jsonObject = new JSONObject(builder.toString()) 
                        .getJSONObject("userbean"); 

                String Uid; 
                String Showname; 
                String Avtar; 
                String State; 

                Uid = jsonObject.getString("Uid"); 
                Showname = jsonObject.getString("Showname"); 
                Avtar = jsonObject.getString("Avtar"); 
                State = jsonObject.getString("State");
带数组形式的：
服务器端返回的数据格式为：

{"calendar": 
    {"calendarlist": 
            [ 
            {"calendar_id":"1705","title":"(\u4eb2\u5b50)ddssd","category_name":"\u9ed8\u8ba4\u5206\u7c7b","showtime":"1288927800","endshowtime":"1288931400","allDay":false}, 
            {"calendar_id":"1706","title":"(\u65c5\u884c)","category_name":"\u9ed8\u8ba4\u5206\u7c7b","showtime":"1288933200","endshowtime":"1288936800","allDay":false} 
            ] 
    } 
}

分析代码如下：

// TODO 状态处理 500 200 
                int res = 0; 
                res = httpClient.execute(httpPost).getStatusLine().getStatusCode(); 
                if (res == 200) { 
                    /* 
                     * 当返回码为200时，做处理 
                     * 得到服务器端返回json数据，并做处理 
                     * */ 
                    HttpResponse httpResponse = httpClient.execute(httpPost); 
                    StringBuilder builder = new StringBuilder(); 
                    BufferedReader bufferedReader2 = new BufferedReader( 
                            new InputStreamReader(httpResponse.getEntity().getContent())); 
                    String str2 = ""; 
                    for (String s = bufferedReader2.readLine(); s != null; s = bufferedReader2 
                            .readLine()) { 
                        builder.append(s); 
                    } 
                    Log.i("cat", ">>>>>>" + builder.toString()); 
                    /** 
                     * 这里需要分析服务器回传的json格式数据， 
                     */ 
                    JSONObject jsonObject = new JSONObject(builder.toString()) 
                            .getJSONObject("calendar"); 
                    JSONArray jsonArray = jsonObject.getJSONArray("calendarlist"); 
                    for(int i=0;i<jsonArray.length();i++){ 
                        JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i); 
                        CalendarInfo calendarInfo = new CalendarInfo(); 
                        calendarInfo.setCalendar_id(jsonObject2.getString("calendar_id")); 
                        calendarInfo.setTitle(jsonObject2.getString("title")); 
                        calendarInfo.setCategory_name(jsonObject2.getString("category_name")); 
                        calendarInfo.setShowtime(jsonObject2.getString("showtime")); 
                        calendarInfo.setEndtime(jsonObject2.getString("endshowtime")); 
                        calendarInfo.setAllDay(jsonObject2.getBoolean("allDay")); 
                        calendarInfos.add(calendarInfo); 
                    }

总结，普通形式的只需用JSONObject ，带数组形式的需要使用JSONArray 将其变成一个list。