Java Jackson如何在默认情况下序列化none？；

当我使用SpringMVC时，我想要得到json字符串，但遇到了一个问题

我有一个类用户：

public class User {
        private String username;
        private String password;
        private boolean accountNonExpired = true;
        private boolean accountNonLocked = true;
        private boolean credentialsNonExpired = true;
        private boolean enabled = true;
        private DateTime registeTime;
        private String ip;
        private DateTime loginTime;
        private DateTime logoutTime;
        private String loginIp;
        private DateTime lastLogoutTime;
        private int passwordExpiredDays = -1;
        private DateTime passwordChangeTime;
        private boolean loginAtSameTime = false;
        private int loginAttempt = 0;
        private int status = 0;
        private String problem;
        private String solution;
}

我想要得到json，比如：

{"username":"a","ip":"127.0.0.1"}

现在，我使用：

@JsonIgnoreProperties(value = {"password","accountNonExpired", 
"accountNonLocked","credentialsNonExpired", "enabled", "registeTime", 
"loginTime", "logoutTime", "passwordExpiredDays", "passwordChangeTime", 
"loginAtSameTime", "loginAttempt", "status", "problem", "solution"})
public class User {
        ...
}

但是！！！这很复杂。我能找到一个解决方法吗？例如：

@JsonInclude("Annotation")
public class User {
    @JsonInclude
    private String username;
    ...
    @JsonInclude
    private String ip;
    ...
}

或

---

我认为您可以在字段级别使用

@JsonIgnore

注释，以避免在序列化过程中使用它。

我相信您所需要做的就是用

@JsonProperty

标记您想要的字段。例如：

public class User {
    @JsonProperty
    private String username;
    ...
    @JsonProperty
    private String ip;
    ...
}

public class User {
    @JsonProperty
    private String username;
    ...
    @JsonProperty
    private String ip;
    ...
}