java - 隐藏 JSON 字段

Question

我有 hibernate 实体，它作为参数传递给 Controller ​​，我想隐藏 userID 字段。我将它用于数据库操作，不需要将其显示为输入参数

 @Entity
    @Table(name = "user_sessions")
    public class UserSession{

    @Column(name="uid")
    private Long userID;
    @Id
    @Column(name="access_key")
    private String accessKey;
    @Column(name="secret_key")
    private String secretKey;

    public Long getUserID() {
    return userID;
    }

    public void setUserID(Long s) {
        this.userID = s;
    }`

Answer 1

你可以做类似的事情

    @Entity
    @Table(name = "user_sessions")
    public class UserSession{

    @Column(name="uid")
    private Long userID;
    @Id
    @Column(name="access_key")
    private String accessKey;
    @Column(name="secret_key")
    private String secretKey;
    @JsonIgnore
    public Long getUserID() {
    return userID;
    }

    public void setUserID(Long s) {
        this.userID = s;
    }`

现在如果你像这样使用 jackson

ObjectMapper mapper = new ObjectMapper();   
String json =  mapper.writeValueAsString(userSession);

然后它将简单地忽略 userId

或者你可以按照下面的方式做

    @Entity
    @Table(name = "user_sessions")
    @JsonIgnoreProperties( { "userID" })
    public class UserSession{

    @Column(name="uid")
    private Long userID;
    @Id
    @Column(name="access_key")
    private String accessKey;
    @Column(name="secret_key")
    private String secretKey;

    public Long getUserID() {
    return userID;
    }

    public void setUserID(Long s) {
        this.userID = s;
    }`