Java Jackson核心注解使用详解

public class User {
    @JsonProperty("user_name")
    private String username;
    // getter/setter
}

{
  "user_name": "Tom"
}

public class Account {
    private String username;
    @JsonIgnore
    private String password;
    // getter/setter
}

@JsonInclude(JsonInclude.Include.NON_NULL)
public class Product {
    private String name;
    private String description;
}

@JsonInclude(JsonInclude.Include.NON_EMPTY)
private List<String> tags;

public class Event {
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private Date eventTime;
}

public class Currency {
    private String code;
    @JsonCreator
    public Currency(@JsonProperty("code") String code) {
        this.code = code;
    }
    public String getCode() { return code; }
}

public class Status {
    private final String value;
    public Status(String value) {
        this.value = value;
    }
    @JsonValue
    public String getValue() {
        return value;
    }
}

public class User {
    @JsonProperty("user_name")
    private String username;
    @JsonIgnore
    private String password;
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String email;
    @JsonFormat(pattern = "yyyy-MM-dd")
    private Date birthday;
    // getters and setters
}

@RestController
public class UserController {
    @GetMapping("/user")
    public User getUser() {
        User user = new User();
        user.setUsername("alice");
        user.setPassword("123456");
        user.setEmail(null);
        user.setBirthday(new Date());
        return user;
    }
}