JackJson

Jackson

实体类

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Address {
    private String country;
    private String city;
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {
    private String name;
    private int age;
    @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
    private Date data;
    private Address address;
}

Json—— Object

private ObjectMapper objectMapper = new ObjectMapper();
private Address address = new Address("china","wuhan");
private User user = new User("zhangsan",18,new Date(),address);
/**
 * 单个复杂对象的转换
 * @throws JsonProcessingException
 */
@Test
void objectString() throws JsonProcessingException {
    String s = objectMapper.writeValueAsString(user);
    System.out.println(s);
    User user1 = objectMapper.readValue(s,User.class);
    System.out.println(user1.getAge());
    System.out.println(user1.getAddress().getCity());
}

Json—— List

private ObjectMapper objectMapper = new ObjectMapper();
private Address address = new Address("china","wuhan");
private User user = new User("zhangsan",18,new Date(),address);
/**
 * List--String
 * @throws JsonProcessingException
 */
@Test
void objectList() throws JsonProcessingException {
    List<User> list = new ArrayList<User>();
    list.add(user);
    list.add(user);
    String jsonString = objectMapper.writeValueAsString(list);
    System.out.println(jsonString);
    List<User> list1 = objectMapper.readValue(jsonString,List.class);
    System.out.println(list1.get(0));
}

Json—— Map

private ObjectMapper objectMapper = new ObjectMapper();
private Address address = new Address("china","wuhan");
private User user = new User("zhangsan",18,new Date(),address);
/**
 * Map--String
 * @throws JsonProcessingException
 */
@Test
void objectMap() throws JsonProcessingException {
    Map<String,User> map = new HashMap<>();
    map.put("1",user);
    map.put("2",user);
    String jsonString = objectMapper.writeValueAsString(map);
    System.out.println(jsonString);
    Map<String,User> map1 = objectMapper.readValue(jsonString,Map.class);
    System.out.println(map1.get("1"));
}