摘要: Gson解析複雜的json數據 在這裏介紹解析json數據的另外一種方法就是通過Gson解析,對於解析比較簡單的json數據我就不介紹了來一個比較複雜一點的json數據,如下面我們要解析的一個json數據: [java] view plaincopy ...
Gson解析複雜的json數據
在這裏介紹解析json數據的另外一種方法就是通過Gson解析,對於解析比較簡單的json數據我就不介紹了來一個比較複雜一點的json數據,如下面我們要解析的一個json數據:
- 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的配合起來使用也是可以解析的但是解析起來就比較麻煩了,如果使用Gson解析就比較簡單了,首先我們需要定義一個序列化的Bean,這裏採用內部類的形式,這樣比較容易看得清晰些
首先我們需要定義一個序列化的Bean,這裏採用內部類的形式,看起來會比較清晰一些:
- 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;
- }
- }
很多時候大家都是不知道這個Bean是該怎麼定義,這裏面需要注意幾點:
1、內部嵌套的類必須是static的,要不然解析會出錯;
2、類裏面的屬性名必須跟Json字段裏面的Key是一模一樣的;
3、內部嵌套的用[]括起來的部分是一個List,所以定義爲 public List<B> b,而只用{}嵌套的就定義爲 public C c,
具體的大家對照Json字符串看看就明白了,不明白的我們可以互相交流,本人也是開發新手!
- Gson gson = new Gson();
- java.lang.reflect.Type type = new TypeToken<JsonBean>() {}.getType();
- JsonBean jsonBean = gson.fromJson(json, type);
如果需要解析的Json嵌套了很多層,同樣可以可以定義一個嵌套很多層內部類的Bean,需要細心的對照Json字段來定義哦。
下面我將以一個具體的列子來說明通過Gson方式解析複雜的json數據
1.將要解析的數據如下面的格式
{
"error": 0,
"status": "success",
"date": "2014-05-10",
"results": [
{
"currentCity": "南京",
"weather_data": [
{
"date": "週六(今天, 實時: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": "東南風5-6級",
"temperature": "18℃"
},
{
"date": "週日",
"dayPictureUrl": "http://api.map.baidu.com/images/weather/day/zhenyu.png",
"nightPictureUrl": "http://api.map.baidu.com/images/weather/night/duoyun.png",
"weather": "陣雨轉多雲",
"wind": "西北風4-5級",
"temperature": "21 ~ 14℃"
}
]
}
]
}
2.必須定義如下一些的javaBean數據
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是測試使用的json數據
- 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>
大家可以仔細的去拜讀。
轉載:
http://blog.csdn.net/tkwxty/article/details/34474501