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：
- 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：
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！
- Gson gson = new Gson();
- java.lang.reflect.Type type = new TypeToken<JsonBean>() {}.getType();
- 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
- 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 + "]";
- }
- 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
- + "]";
- }
- 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);
- }
- });
- }
- }
- </span>
大家可以仔细的去拜读。
转载：
http://blog.csdn.net/tkwxty/article/details/34474501
