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：
1 public classJsonBean {2 publicString a;3 public Listb;4 publicC c;5
6 public static classB {7
8 publicString b1;9
10 publicString b2;11 }12
13 public static classC {14 publicString c1;15 publicString c2;16 }17 }
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 Listb，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！
1 Gson gson = newGson();2 java.lang.reflect.Type type = new TypeToken() {}.getType();3 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": "-05-10",
"results": [
{
"currentCity": "南京",
"weather_data": [
{
"date": "周六(今天, 实时：19℃)",
"dayPictureUrl": "http://api./images/weather/day/dayu.png",
"nightPictureUrl": "http://api./images/weather/night/dayu.png",
"weather": "大雨",
"wind": "东南风5-6级",
"temperature": "18℃"
},
{
"date": "周日",
"dayPictureUrl": "http://api./images/weather/day/zhenyu.png",
"nightPictureUrl": "http://api./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
1 public classStatus2 {3 privateString error;4 privateString status;5 privateString date;6 private Listresults;7 publicString getError()8 {9 returnerror;10 }11 public voidsetError(String error)12 {13 this.error =error;14 }15
16 publicString getStatus()17 {18 returnstatus;19 }20 public voidsetStatus(String status)21 {22 this.status =status;23 }24 publicString getDate()25 {26 returndate;27 }28 public voidsetDate(String date)29 {30 this.date =date;31 }32 public ListgetResults()33 {34 returnresults;35 }36 public void setResults(Listresults)37 {38 this.results =results;39 }40 @Override41 publicString toString()42 {43 return "Status [error=" + error + ", status=" +status44 + ", date=" + date + ", results=" + results + "]";45 }46
Results.java
1 public classResults2 {3 privateString currentCity;4 private Listweather_data;5 publicString getCurrentCity()6 {7 returncurrentCity;8 }9 public voidsetCurrentCity(String currentCity)10 {11 this.currentCity =currentCity;12 }13 public ListgetWeather_data()14 {15 returnweather_data;16 }17 public void setWeather_data(Listweather_data)18 {19 this.weather_data =weather_data;20 }21 @Override22 publicString toString()23 {24 return "Results [currentCity=" + currentCity + ", weather_data="
25 + weather_data + "]";26 }
Weather.java
1 public classWeather {2 privateString date;3 privateString dayPictureUrl;4 privateString nightPictureUrl;5 privateString weather;6 privateString wind;7 privateString temperature;8 publicString getDate() {9 returndate;10 }11 public voidsetDate(String date) {12 this.date =date;13 }14 publicString getDayPictureUrl() {15 returndayPictureUrl;16 }17 public voidsetDayPictureUrl(String dayPictureUrl) {18 this.dayPictureUrl =dayPictureUrl;19 }20 publicString getNightPictureUrl() {21 returnnightPictureUrl;22 }23 public voidsetNightPictureUrl(String nightPictureUrl) {24 this.nightPictureUrl =nightPictureUrl;25 }26 publicString getWeather() {27 returnweather;28 }29 public voidsetWeather(String weather) {30 this.weather =weather;31 }32 publicString getWind() {33 returnwind;34 }35 public voidsetWind(String wind) {36 this.wind =wind;37 }38 publicString getTemperature() {39 returntemperature;40 }41 public voidsetTemperature(String temperature) {42 this.temperature =temperature;43 }44 @Override45 publicString toString() {46 return "Weather [date=" + date + ", dayPictureUrl="
47 + dayPictureUrl + ", nightPictureUrl="
48 + nightPictureUrl + ", weather=" +weather49 + ", wind=" + wind + ", temperature=" +temperature50 + "]";51 }52
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
1 public class MainActivity extendsActivity2 {3 privateButton tojson;4 RequestQueue mQueue;5 StringRequest stringRequest;6 Gson gson;7 String str;8
9 @Override10 protected voidonCreate(Bundle savedInstanceState)11 {12 super.onCreate(savedInstanceState);13 setContentView(R.layout.activity_main);14
15 tojson =(Button)findViewById(R.id.tojson);16 gson = newGson();17
18 mQueue = Volley.newRequestQueue(MainActivity.this);19 //http://10.19.20.12/upgrade/test.txt是测试使用的json数据
20 stringRequest = new StringRequest("http://10.19.20.12/upgrade/test.txt",21 new Response.Listener()22 {23 @Override24 public voidonResponse(String response)25 {26 Log.d("TAG", response);27 System.out.println("response="+response);28 Status status = gson.fromJson(response, Status.class);29 System.out.println("status="+status);30 System.out.println("-------------------------------------");31 List result =status.getResults();32 System.out.println("result="+result);33
34 }35 },36 newResponse.ErrorListener()37 {38 @Override39 public voidonErrorResponse(VolleyError error)40 {41 Log.e("TAG", error.getMessage(), error);42 }43
44 });45
46 tojson.setOnClickListener(newOnClickListener()47 {48 @Override49 public voidonClick(View v)50 {51 mQueue.add(stringRequest);52 }53 });54 }55
56
57
58 }
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前面的文章，其中对Volley的讲解也很详细了，相信各位朋友很快便能领悟出来。
