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最近在给公司做一个直播APK的项目,主要就是通过解析网络服务器上的json数据,然后将频道地址下载下来再调用Android的播放器进行播放,原先本来打算使用普通的json解析方法即JsonObject和JsonArray的配合使用,这对于解析小数据的json数据还是比较实用,但是当解析json数据比较复杂的时候这种方法就显得比较吃力也比较麻烦了,如果大家感兴趣的话网上有大量的实例可以到网上去看看。
在这里我将介绍解析json数据的另外一种方法就是通过Gson解析,对于解析比较简单的json数据我就不介绍了来一个比较复杂一点的json数据,如下面我们要解析的一个json数据:
String json = {"a":"100","b":[{"b1":"b_value1","b2":"b_value2"}, {"b1":"b_value1","b2":"b_value2"}],"c": {"c1":"c_value1","c2":"c_value2"}}
如果使用JsonObject和JsonArray的配合起来使用也是可以解析的但是解析起来就比较麻烦了,如果使用Gson解析就比较简单了,首先我们需要定义一个序列化的Bean,这里采用内部类的形式,这样比较容易看得清晰些
首先我们需要定义一个序列化的Bean,这里采用内部类的形式,看起来会比较清晰一些:
public class JsonBean { public String a; public List<B> b; public C c; public static class B { public String b1; public String b2; } public static class C { public String c1; public String c2; } }
很多时候大家都是不知道这个Bean是该怎么定义,这里面需要注意几点:
具体的大家对照Json字符串看看就明白了,不明白的我们可以互相交流,本人也是开发新手!
Gson gson = new Gson(); java.lang.reflect.Type type = new TypeToken<JsonBean>() {}.getType(); JsonBean jsonBean = gson.fromJson(json, type);</span>
然后想拿数据就很简单啦,直接在jsonBean里面取就可以了!
如果需要解析的Json嵌套了很多层,同样可以可以定义一个嵌套很多层内部类的Bean,需要细心的对照Json字段来定义哦。
下面我将以一个具体的列子来说明通过Gson方式解析复杂的json数据
1.将要解析的数据如下面的格式
{ "error":0, "status":"success", "date":"2014-05-10", "results":[ { "currentCity":"南京", "weather_data":[ { "date":"周六(今天, 实时:19℃)", "dayPictureUrl":"http://api.map.baidu.com/images/weather/day/dayu.png", "nightPictureUrl":"http://api.map.baidu.com/images/weather/night/dayu.png", "weather":"大雨", "wind":"东南风5-6级", "temperature":"18℃" }, { "date":"周日", "dayPictureUrl":"http://api.map.baidu.com/images/weather/day/zhenyu.png", "nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png", "weather":"阵雨转多云", "wind":"西北风4-5级", "temperature":"21 ~ 14℃" } ] } ] }
2.必须定义如下一些的javaBean数据
Status.java
public class Status { private String error; private String status; private String date; private List<Results> results; public String getError() { return error; } public void setError(String error) { this.error = error; } public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public String getDate() { return date; } public void setDate(String date) { this.date = date; } public List<Results> getResults() { return results; } public void setResults(List<Results> results) { this.results = results; } @Override public String toString() { return "Status [error=" + error + ", status=" + status + ", date=" + date + ", results=" + results + "]"; }
Results.java
public class Results { private String currentCity; private List<Weather> weather_data; public String getCurrentCity() { return currentCity; } public void setCurrentCity(String currentCity) { this.currentCity = currentCity; } public List<Weather> getWeather_data() { return weather_data; } public void setWeather_data(List<Weather> weather_data) { this.weather_data = weather_data; } @Override public String toString() { return "Results [currentCity=" + currentCity + ", weather_data=" + weather_data + "]"; }
Weather.java
public class Weather { private String date; private String dayPictureUrl; private String nightPictureUrl; private String weather; private String wind; private String temperature; public String getDate() { return date; } public void setDate(String date) { this.date = date; } public String getDayPictureUrl() { return dayPictureUrl; } public void setDayPictureUrl(String dayPictureUrl) { this.dayPictureUrl = dayPictureUrl; } public String getNightPictureUrl() { return nightPictureUrl; } public void setNightPictureUrl(String nightPictureUrl) { this.nightPictureUrl = nightPictureUrl; } public String getWeather() { return weather; } public void setWeather(String weather) { this.weather = weather; } public String getWind() { return wind; } public void setWind(String wind) { this.wind = wind; } public String getTemperature() { return temperature; } public void setTemperature(String temperature) { this.temperature = temperature; } @Override public String toString() { return "Weather [date=" + date + ", dayPictureUrl=" + dayPictureUrl + ", nightPictureUrl=" + nightPictureUrl + ", weather=" + weather + ", wind=" + wind + ", temperature=" + temperature + "]"; }
然后具体的javabean定义好了就将解析数据了,下面就是我的解析数据类
public class MainActivity extends Activity { private Button tojson; RequestQueue mQueue; StringRequest stringRequest; Gson gson; String str; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tojson = (Button)findViewById(R.id.tojson); gson = new Gson(); mQueue = Volley.newRequestQueue(MainActivity.this); //http://10.19.20.12/upgrade/test.txt是测试使用的json数据 stringRequest = new StringRequest("http://10.19.20.12/upgrade/test.txt", new Response.Listener<String>() { @Override public void onResponse(String response) { Log.d("TAG", response); System.out.println("response="+response); Status status = gson.fromJson(response, Status.class); System.out.println("status="+status); System.out.println("-------------------------------------"); List<Results> result = status.getResults(); System.out.println("result="+result); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e("TAG", error.getMessage(), error); } }); tojson.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mQueue.add(stringRequest); } }); } }
其中上面的RequestQueue是开源网络库Volley的使用,如果你对该库的使用还不熟悉的话可以参考http://blog.csdn.net/guolin_blog/article/details/17482095,该作者对Volley库的使用讲解得非常的细致和深入
大家可以仔细的去拜读。
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原文地址:http://www.cnblogs.com/lr393993507/p/5275276.html