网络爬虫返回json处理数据

JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。它基于JavaScript（Standard ECMA-262 3rd Edition - December 1999）的一个子集。

JSON 表示名称 / 值对的方式

按照最简单的形式，可以用下面这样的 JSON 表示"名称 / 值对"：

            { "name": "Brett", "lage":22,"sex": "女" } ，这表示了一个JsonObject。

            [{name:"张三:",age:21,sex:"女"},{name:"李斯",age:21,sex:"女"},{name:"王五",age:21,sex:"女"}]，使用中括弧表示JsonArray，是json对象数组。

       一、解析第一种单个json对象的json数据。数据从网络上获取。演示实例为 查询手机号码归属地。

      

URL url;
        StringBuffer sb = new StringBuffer();
        String line = null;
        try {
            url = new URL(
            "http://api.showji.com/Locating/default.aspx?m=13763089126&output=json&callback=querycallback");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            InputStream is = conn.getInputStream();
            BufferedReader buffer = new BufferedReader(
                    new InputStreamReader(is));
            while ((line = buffer.readLine()) != null) {
                sb.append(line);
            }

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

URL url;
		StringBuffer sb = new StringBuffer();
		String line = null;
		try {
			url = new URL(
			"http://api.showji.com/Locating/default.aspx?m=13763089126&output=json&callback=querycallback");
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			InputStream is = conn.getInputStream();
			BufferedReader buffer = new BufferedReader(
					new InputStreamReader(is));
			while ((line = buffer.readLine()) != null) {
				sb.append(line);
			}

		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

此处获取的数据为：

querycallback({"Mobile":"13763******","QueryResult":"True","Province":"广东","City":"湛江","AreaCode":"0759","PostCode":"524000","Corp":"中国移动","Card":"GSM"});

需要截取这个json对象出来。

String js = sb.substring(sb.indexOf("{"), sb.indexOf("}") + 1);

 

下面函数解析json对象，返回一个Callerloc对象

Callerloc是一个实体类

private Callerloc parse(String json) {
        Callerloc my = null;

        if (json == null || json.length() < 1)
            return null;
        try {
            my = new Callerloc();
            JSONObject jsonobj = new JSONObject(json);

private Callerloc parse(String json) {
		Callerloc my = null;

		if (json == null || json.length() < 1)
			return null;
		try {
			my = new Callerloc();
			JSONObject jsonobj = new JSONObject(json);

my.setQueryResult(jsonobj.getString("QueryResult"));
my.setProvince(jsonobj.getString("Province"));
my.setCity(jsonobj.getString("City"));
my.setAreaCode(jsonobj.getString("AreaCode"));
my.setPostCode(jsonobj.getString("PostCode"));
my.setCard(jsonobj.getString("Card"));
my.setCorp(jsonobj.getString("Corp"));

			my.setMobile(jsonobj.getString("Mobile"));
			my.setQueryResult(jsonobj.getString("QueryResult"));
			my.setProvince(jsonobj.getString("Province"));
			my.setCity(jsonobj.getString("City"));
			my.setAreaCode(jsonobj.getString("AreaCode"));
			my.setPostCode(jsonobj.getString("PostCode"));
			my.setCard(jsonobj.getString("Card"));
			my.setCorp(jsonobj.getString("Corp"));
			

    } catch (JSONException e) {
        e.printStackTrace();
    }
    return my;
}

		} catch (JSONException e) {
			e.printStackTrace();
		}
		return my;
	}

       二、解析json数组

            json数据为：[{name:"张三:",age:21,sex:"女"},{name:"李斯",age:21,sex:"女"},{name:"王五",age:21,sex:"女"}]

           返回list

private ArrayList<myjson> parsem(String json) {
        myjson my = null;

        if (json == null || json.length() < 1)
            return null;
        try {
            JSONArray jsonary = new JSONArray(json);
            ArrayList<myjson> objlist = new ArrayList<myjson>();
            for (int i = 0; i < jsonary.length(); i++) {
                my = new myjson();
                JSONObject jsonobj = jsonary.getJSONObject(i);
                my.set_name(jsonobj.getString("name"));
                my.set_age(jsonobj.getInt("age"));
                my.set_sex(jsonobj.getString("sex"));
                objlist.add(my);
            }
            return objlist;
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }