Guide to Fastjson Deserialization

The deserialization parsing process of Fastjson is as follows:

1. Firstly, fastjson will create a JSONReader object based on the input JSON string (or other input sources such as InputStream).
2. Then, fastjson will use the JSONReader object to read the content of the JSON string, and parse it into JSONObject or JSONArray objects in memory.
3. During the parsing process, fastjson will parse each key-value pair of the JSON object or element of the array according to the syntax rules of the JSON string, and convert them based on the corresponding data types.
4. Fastjson will recursively parse complex data structures, such as nested JSONObjects or JSONArrays.
5. During the parsing process, fastjson will convert the values in JSON to the field values (or array elements) of Java objects based on the field names (or array indexes) and corresponding type information.
6. Finally, fastjson will return the parsed Java object to the caller, completing the deserialization process.

It’s worth noting that fastjson supports custom deserialization functions and the ability to expand its deserialization capabilities by implementing custom deserializers.