Gson解析复杂的json数据
在这里介绍解析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：
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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：
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public class JsonBean {
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public String a;
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public List<B> b;
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public C c;
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public static class B {
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public String b1;
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public String b2;
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}
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public static class C {
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public String c1;
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public String c2;
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}
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}
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：
1、内部嵌套的类必须是static的，要不然解析会出错；
2、类里面的属性名必须跟Json字段里面的Key是一模一样的；
3、内部嵌套的用[]括起来的部分是一个List，所以定义为 public List<B> b，而只用{}嵌套的就定义为 public C c，
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！
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Gson gson = new Gson();
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java.lang.reflect.Type type = new TypeToken<JsonBean>() {}.getType();
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JsonBean jsonBean = gson.fromJson(json, type);
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
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public class Status
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{
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private String error;
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private String status;
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private String date;
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private List<Results> results;
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public String getError()
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{
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return error;
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}
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public void setError(String error)
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{
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this.error = error;
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}
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public String getStatus()
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{
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return status;
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}
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public void setStatus(String status)
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{
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this.status = status;
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}
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public String getDate()
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{
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return date;
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}
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public void setDate(String date)
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{
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this.date = date;
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}
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public List<Results> getResults()
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{
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return results;
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}
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public void setResults(List<Results> results)
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{
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this.results = results;
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}
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@Override
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public String toString()
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{
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return "Status [error=" + error + ", status=" + status
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+ ", date=" + date + ", results=" + results + "]";
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}
Results.java
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public class Results
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{
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private String currentCity;
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private List<Weather> weather_data;
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public String getCurrentCity()
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{
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return currentCity;
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}
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public void setCurrentCity(String currentCity)
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{
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this.currentCity = currentCity;
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}
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public List<Weather> getWeather_data()
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{
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return weather_data;
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}
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public void setWeather_data(List<Weather> weather_data)
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{
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this.weather_data = weather_data;
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}
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@Override
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public String toString()
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{
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return "Results [currentCity=" + currentCity + ", weather_data="
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+ weather_data + "]";
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}
Weather.java
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public class Weather {
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private String date;
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private String dayPictureUrl;
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private String nightPictureUrl;
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private String weather;
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private String wind;
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private String temperature;
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public String getDate() {
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return date;
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}
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public void setDate(String date) {
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this.date = date;
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}
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public String getDayPictureUrl() {
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return dayPictureUrl;
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}
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public void setDayPictureUrl(String dayPictureUrl) {
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this.dayPictureUrl = dayPictureUrl;
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}
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public String getNightPictureUrl() {
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return nightPictureUrl;
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}
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public void setNightPictureUrl(String nightPictureUrl) {
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this.nightPictureUrl = nightPictureUrl;
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}
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public String getWeather() {
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return weather;
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}
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public void setWeather(String weather) {
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this.weather = weather;
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}
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public String getWind() {
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return wind;
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}
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public void setWind(String wind) {
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this.wind = wind;
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}
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public String getTemperature() {
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return temperature;
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}
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public void setTemperature(String temperature) {
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this.temperature = temperature;
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}
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@Override
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public String toString() {
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return "Weather [date=" + date + ", dayPictureUrl="
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+ dayPictureUrl + ", nightPictureUrl="
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+ nightPictureUrl + ", weather=" + weather
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+ ", wind=" + wind + ", temperature=" + temperature
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+ "]";
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}
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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
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public class MainActivity extends Activity
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{
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private Button tojson;
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RequestQueue mQueue;
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StringRequest stringRequest;
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Gson gson;
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String str;
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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tojson = (Button)findViewById(R.id.tojson);
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gson = new Gson();
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mQueue = Volley.newRequestQueue(MainActivity.this);
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stringRequest = new StringRequest("http://10.19.20.12/upgrade/test.txt",
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new Response.Listener<String>()
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{
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@Override
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public void onResponse(String response)
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{
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Log.d("TAG", response);
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System.out.println("response="+response);
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Status status = gson.fromJson(response, Status.class);
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System.out.println("status="+status);
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System.out.println("-------------------------------------");
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List<Results> result = status.getResults();
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System.out.println("result="+result);
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}
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},
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new Response.ErrorListener()
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{
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@Override
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public void onErrorResponse(VolleyError error)
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{
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Log.e("TAG", error.getMessage(), error);
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}
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});
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tojson.setOnClickListener(new OnClickListener()
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{
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@Override
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public void onClick(View v)
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{
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mQueue.add(stringRequest);
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}
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});
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}
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}
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</span>
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。
转载：
http://blog.csdn.net/tkwxty/article/details/34474501
Android开发之Gson解析Json嵌套数据
原文：http://blog.csdn.net/minimicall/article/details/39301485
