Google Gson Json conversion method has the following sequence:
Object fromJson public (String JSON, the Type typeOfT);
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can use it to parse an array. As follows, using this method to resolve Json string array type MyBean List of methods are available.
List <MyBean> LST = Gson new new () fromJson (Data, new new TypeToken <List <MyBean >> () {} getType ().);.
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, but if the generic MyBean to T, this packaging method is as follows:
List<T> lst = new Gson().fromJson(data, new TypeToken<List<T>>(){}.getType());
public static <T> List<T> parseJson2List(String data, Class<T> clazz){
try {
return new Gson().fromJson(data, new TypeToken<List<T>>(){}.getType());
} catch(Throwable e){
e.printStackTrace();
return null;
}
}
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例，实例化泛型为Test
{the Test class
Private ID String;
Private String name;
Private String value;
}
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calls the packaging method is as follows:
List <Test> lst = parseJson2List ( new String ( "[{id: 'myid', name: 'myname', value: 'myvaule'}, {id: 'myid', name: 'myname', value: 'myvaule '}] "), Test.class);
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debugging results below, LinkedTreeMap array object type, the type is not expected Test.
Here Insert Picture Description
The reason: generics at compile-time type erasure cause, type erase visible link below:
http://stackoverflow.com/questions/20773850/gson-typetoken-with-dynamic-arraylist-item-type
http://blog.csdn.net/gstormspire/article/details/7638638
Solution:
public static <T> List<T> fromJsonArray(String json, Class<T> clazz) throws Exception {
List<T> lst = new ArrayList<T>();
JsonArray array = new JsonParser().parse(json).getAsJsonArray();
for(final JsonElement elem : array){
lst.add(new Gson().fromJson(elem, clazz));
}
return lst;
}