How to parse JSON file?

Question

Simple situation -

1. read a json file
2. discover all key-value pairs
3. compare key-value pairs

I tried gson, package from json.org,

Answer 1

We use Jaskson parser, here are the sample code:

protected T getJsonObject(InputStream inputStream, Class className) throws JsonParseException,
      JsonMappingException, IOException {
    // Deserialize input to Json object
    ObjectMapper mapper = new ObjectMapper();

    T jsonSource = mapper.readValue(inputStream, className);
    return jsonSource;
}

Here is the code how to invoke it:

JsonEmployee jsonEmployee = getJsonObject(inputStream, JsonEmployee.class);

JsonEmployee.java is just POJO