JsonView返回空的JSON对象

Question

我正在尝试实现JsonView来选择性地序列化实体中的字段，但是序列化的json有没有字段的空对象。下面是我的代码:

ViewClass:

public class AuditReportView {
   public interface Summary {}
}

实体:

@Entity
@SequenceGenerator(name = "AUDIT_REPORT_SEQUENCE_GENERATOR", sequenceName = "EJB_AUDIT_REPORT_SEQ", initialValue = 1, allocationSize = 1)
@Table(name = "DEVICE_AUDIT_REPORT")
@Data
public class AuditReport implements Serializable {

   private static final long serialVersionUID = 1246376778314918671L;

   @Id
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "AUDIT_REPORT_SEQUENCE_GENERATOR")
   @Column(name = "ID", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private Long id;

   @Column(name = "DEVICE_ID", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private String deviceId;

   @Column(name = "REPORT_TIMESTAMP", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private Calendar reportTimestamp;

   @Column(name = "USER_ID", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private long userId;

   @Column(name = "USERNAME", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private String username;

   @Column(name = "START_DATE", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private Calendar startDate;

   @Column(name = "END_DATE", nullable = false)
   @JsonView(AuditReportView.Summary.class)
   private Calendar endDate;

   @OneToMany(mappedBy = "auditReport", fetch = FetchType.LAZY, orphanRemoval = true, cascade={CascadeType.ALL})
   private Set<AuditEntry> auditEntries = new HashSet<AuditEntry>();
}

Controller :

   @JsonView(AuditReportView.Summary.class)
   @RequestMapping(method = RequestMethod.GET, value = "auditReportSummary")
   public @ResponseBody ResponseEntity<?> getAuditReportSummary()
   {
      final List<AuditReport> auditReports = auditDAO.getAuditReportSummary();

      return new ResponseEntity<>(auditReports, HttpStatus.OK);
   }

来自 postman 的杰森:

[
  {},
  {},
  {}
]

该数据库只有3个结果，当我调试它时，一定要把它们拉出来，只是没有成员被序列化。我正在使用Spring 4.3.7和Jackson 2.8.7。关于可能出什么问题或从哪里开始调试问题的任何想法？

谢谢

Answer 1

您必须为属性创建getter和setter方法。我做到了，它奏效了。