[英]How to create Generic method for Gson marshal and unmarshal?
I am new to Generics. 我是泛型新手。
I tried to create generic Gson marshal (ie, gson.toJson()) and unmarshal (ie, gson.fromJson())methods. 我试图创建通用的Gson元帅(即gson.toJson())和非元帅(即gson.fromJson())方法。
public class Message {
private MessageBody messageBody;
....
}
public class MessageBody {
private List<BodyParam> bodyParams;
}
public class MessageBodyParam {
private String name;
private Object value;
}
public class JsonUtil {
//This is not working
public static <T> String marshal(Object object, Class<T> jtype) {
Gson gson = new Gson();
Type type = new TypeToken<T>() {}.getType();
return gson.toJson(object, type);
}
//this is working as expected
public static <T> T unmarshal(String jsonStr, Class<T> jtype) {
Gson gson = new Gson();
Type type = new TypeToken<T>() {}.getType();
return gson.fromJson(jsonStr, type);
}
}
I am calling these methods as following: 我称这些方法如下:
//Message is my class
String jsonMessage = JsonUtil.marshal(message, Message.class);
Message message = JsonUtil.unmarshal(message, Message.class);
how to receive the class type in JsonUtil.marshal() and return the String object ? 如何在JsonUtil.marshal()中接收类类型并返回String对象?
Please help me to resolve this. 请帮助我解决此问题。 Thanks. 谢谢。
its too late but this solution is working for me to create a generic class for gson : 为时已晚,但是这个解决方案对我来说为gson创建一个通用类是可行的:
public class JSONConversion<T>{
private T t;
public T getT() {
return t;
}
public void setT(T t) {
this.t = t;
}
public String ObjectToString(){
Gson gson=new Gson();
return gson.toJson(t);
}
public T StringToObject(String jsonString ,Class<T> tt){
Gson gson=new Gson();
return gson.fromJson(jsonString, tt);
}
}
you can use this generic gson class like this: 您可以使用以下通用gson类:
LoginResponse loginResponse = response.body();
JSONConversion<LoginResponse> jsonConversion=new JSONConversion<>();
jsonConversion.setT(loginResponse);
String createdJson=jsonConversion.ObjectToString());
Log.d("toJson",createdJson);
LoginResponse convertedObject=jsonConversion.StringToObject(createdJson,LoginResponse.class);
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