Type conversion, jsonString converted into an object with a generic

1:
 solid JSON:

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.33</version>
</dependency>

Object json string transfer belt generics: 
A <B> orderData = JSON.parseObject ( "json string", new new typereference <A <B >> () {}); 
...

A<B<C>> orderData = JSON.parseObject("json字符串",new TypeReference<A<B<C>>>(){});

... 

2:

 directly JSONObject, JSONArray Processing 


3:

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.1</version>
</dependency>

Gson gson Gson = new ();

T t= gson.fromJson("jsonString", Class<T> clazz);