从Spring MVC作为JSON发送时动态忽略Java对象中的字段

我有这样的模型类，用于hibernate

@Entity
@Table(name = "user",catalog = "userdb")
@JsonIgnoreProperties(ignoreUnknown = truE)
public class User implements java.io.serializable {

    private Integer userId;
    private String userName;
    private String emailId;
    private String encryptedPwd;
    private String createdby;
    private String updatedBy;

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @column(name = "UserId",unique = true,nullable = falsE)
    public Integer getUserId() {
        return thiS.UserId;
    }

    public void setUserId(Integer userId) {
        thiS.UserId = userId;
    }

    @column(name = "UserName",length = 100)
    public String getUserName() {
        return this.username;
    }

    public void setUserName(String userName) {
        this.username = userName;
    }

    @column(name = "EmailId",nullable = false,length = 45)
    public String getEmailId() {
        return this.emailId;
    }

    public void setEmailId(String emailId) {
        this.emailId = emailId;
    }

    @column(name = "EncryptedPwd",length = 100)
    public String getEncryptedPwd() {
        return this.encryptedPwd;
    }

    public void setEncryptedPwd(String encryptedPwd) {
        this.encryptedPwd = encryptedPwd;
    }

    public void setcreatedby(String createdby) {
        this.createdby = createdby;
    }

    @column(name = "updatedBy",length = 100)
    public String getupdatedBy() {
        return this.updatedBy;
    }

    public void setupdatedBy(String updatedBy) {
        this.updatedBy = updatedBy;
    }
}

在Spring MVC控制器中，使用DAO，我可以获取对象。并返回为JSON对象。

@Controller
public class UserController {

    @Autowired
    private Userservice userservice;

    @requestMapping(value = "/getUser/{userID}",method = requestMethod.GET)
    @ResponseBody
    public User getUser(@PathVariable Integer userId) throws Exception {

        User user = userservice.get(userId);
        user.setcreatedby(null);
        user.setupdatedBy(null);
        return user;
    }
}

视图部分是使用AngularJS完成的，因此它将获得像这样的JSON

{
  "userId" :2,"userName" : "john","emailId" : "john@gmail.com","encryptedPwd" : "Co7Fwd1fXYk=","createdby" : null,"updatedBy" : null
}

如果我不想设置加密的密码，则将该字段也设置为null。

但是我不想这样，我不想将所有字段发送到客户端。如果我不希望发送密码，updatedby，createdby字段，则我的结果JSON应该像

{
  "userId" :2,"emailId" : "john@gmail.com"
}

我不想发送给其他数据库表的客户端的字段列表。因此，它将根据登录的用户进行更改。我该怎么做？

我希望你能回答我的问题。