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  public static <T> String serialize(T t) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        String jsonResult = mapper.writerWithDefaultPrettyPrinter()
                .writeValueAsString(t);
        return jsonResult;
    }

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    public static <T> T deserialize(String string, Class<T> clazz) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        return mapper.readValue(string, clazz);
    }

²âÊÔ

Map<String, String> stringStringMap = new HashMap<String, String>();
        stringStringMap.put("key", "value");
        System.out.println("serialize = " + serialize(stringStringMap));
        System.out.println("deserialize = " + deserialize(serialize(stringStringMap), Map.class));

        Map<String, Person> stringPersonMap = new HashMap<String, Person>();
        stringPersonMap.put("engineer", Person.builder().firstName("Tom").lastName("Walton").age(19).build());
        System.out.println("serialize = " + serialize(stringPersonMap));
        System.out.println("deserialize = " + deserialize(serialize(stringPersonMap), Map.class));

        Map<Person, Person> personPersonMap = new HashMap<Person, Person>();
        personPersonMap.put(Person.builder().firstName("Tom").lastName("Walton").age(19).build(), Person.builder().firstName("Jerry").lastName("Walton").age(59).build());
        System.out.println("serialize = " + serialize(personPersonMap));
        System.out.println("deserialize = " + deserialize(serialize(personPersonMap), Map.class));

        Person person = Person.builder().firstName("FirstName").lastName("LastName").age(19).build();
        String strPerson = serialize(person);
        System.out.println("serialize =" + strPerson);
        System.out.println("deserialize = " + deserialize(strPerson, Person.class));

Person¶¨Òå

@Builder
@Getter
@Setter
@EqualsAndHashCode
@ToString
@JsonIgnoreProperties
class Person {
    @JsonProperty
    private String firstName;
    @JsonProperty
    private String lastName;
    @JsonProperty
    private int age;
}

http://www.baeldung.com/jackson-map

http://www.baeldung.com/jackson-deserialization