Gson解析复杂的json数据
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
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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 {
public String a;
publicList b;
public C c;
public static class B{
publicString b1;
public Stringb2;
}
public static class C{
public Stringc1;
public Stringc2;
}
}
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();
java.lang.reflect.Type type newTypeToken() {}.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://img.558idc.com/uploadfile/allimg/0629/dayu.jpg",
"nightPictureUrl":"http://img.558idc.com/uploadfile/allimg/0629/dayu.jpg",
"weather": "大雨",
"wind": "东南风5-6级",
"temperature":"18℃"
},
{
"date": "周日",
"dayPictureUrl":"http://img.558idc.com/uploadfile/allimg/0629/zhenyu.jpg",
"nightPictureUrl":"http://img.558idc.com/uploadfile/allimg/0629/duoyun.jpg",
"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
{
private String error;
private String status;
private String date;
private List 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 getResults()
{
return results;
}
public void setResults(List results)
{
this.results results;
}
Override
public String toString()
{
return "Status [error" error ", status" status
", date" date ", results" results "]";
}
Results.java
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public class Results
{
private String currentCity;
private List weather_data;
public String getCurrentCity()
{
return currentCity;
}
public void setCurrentCity(String currentCity)
{
this.currentCity currentCity;
}
public List getWeather_data()
{
return weather_data;
}
public void setWeather_data(List weather_data)
{
this.weather_data weather_data;
}
Override
public String toString()
{
return "Results [currentCity" currentCity ",weather_data"
weather_data "]";
}
Weather.java
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public class Weather {
private String date;
private StringdayPictureUrl;
private StringnightPictureUrl;
private String weather;
private String wind;
private Stringtemperature;
public String getDate() {
return date;
}
public void setDate(Stringdate) {
this.date date;
}
public StringgetDayPictureUrl() {
return dayPictureUrl;
}
public voidsetDayPictureUrl(String dayPictureUrl) {
this.dayPictureUrl dayPictureUrl;
}
public StringgetNightPictureUrl() {
returnnightPictureUrl;
}
public voidsetNightPictureUrl(String nightPictureUrl) {
this.nightPictureUrl nightPictureUrl;
}
public String getWeather(){
return weather;
}
public void setWeather(Stringweather) {
this.weather weather;
}
public String getWind() {
return wind;
}
public void setWind(Stringwind) {
this.wind wind;
}
public StringgetTemperature() {
return temperature;
}
public voidsetTemperature(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
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public class MainActivity extendsActivity
{
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 newStringRequest("http://10.19.20.12/upgrade/test.txt",
newResponse.Listener()
{
Override
public voidonResponse(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("-------------------------------------");
Listresult status.getResults();
System.out.println("result"result);
}
},
newResponse.ErrorListener()
{
Override
public voidonErrorResponse(VolleyError error)
{
Log.e("TAG",error.getMessage(), error);
}
});
tojson.setOnClickListener(new OnClickListener()
{
Override
public void onClick(View v)
{
mQueue.add(stringRequest);
}
});
}
}
转:https://www.cnblogs.com/dandre/p/4507019.html