使用GSON反序列化内部json字符串属性

Question

我的后端使用Springboot和Gson。我有这两个类的多对多关系：

订单类

@Getter
@Setter
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table( name = "orders")
public class Order {
    @Id
    @Expose
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Expose
    @NotBlank
    private String poNumber;
    @Expose
    @NotBlank
    private String dimension;
    @Expose
    @NotBlank
    private int initialQuantity;
    @Expose
    @NotBlank
    private int leftQuantity;
    @Expose
    @NotBlank
    private Date startDate;
    @Expose
    @NotBlank
    private Date endDate;
    @Expose
    @SerializedName("status")
    @Enumerated(EnumType.STRING)
    @Column(length = 20)
    private PoStatus status;

    @OneToMany(mappedBy="order")
    private Set<Log> logs;

    @Expose
    @SerializedName("products")
    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable( name = "orders_products",
            joinColumns = @JoinColumn(name = "order_id"),
            inverseJoinColumns = @JoinColumn(name = "sap_code"))
    private Set<Product> products = new HashSet<>();

产品类别

@Getter
@Setter
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table( name = "products")
public class Product {
    @Expose
    @Id
    @NotBlank
    private String sapCode;
    @Expose
    @NotBlank
    private String sapCodeDescription;
    @Expose
    private String productData;
}

这是我用来向restendpoint提供数据的服务

public String getAllOrders() {
    List<Order> allOrders = orderRepository.findAll();
    String allOrdersResult = gson.toJson(allOrders);
    return allOrdersResult;
}

以下是回应：

   [
   {
       "id": 1,
       "poNumber": "003100059361",
       "dimension": "INTBKGR",
       "initialQuantity": 200000,
       "leftQuantity": 200000,
       "startDate": "17/08/2022 00:00",
       "endDate": "17/08/2022 00:00",
       "status": "READY",
       "products": [
           {
               "sapCode": "000000000000416234",
               "sapCodeDescription": "1.STUFE 15X",
               "productData": "{\"pieces\": 85, \"mark\": true, \"description\": \"elementum pellentesque quisque porta volutpat erat quisque erat eros viverra eget congue eget\"}"
           }
       ]
   }
]

我的目标是反序列化/转义productDataString属性。

我尝试过创建一个ProductData类并使用@JsonAdapter注释，但据我所知，当您需要为反序列化提供自定义行为时使用此注释，我示例中的JSON字符串非常简单，我不需要任何特定的逻辑。

Answer 1

我认为您必须为此声明一个类，并将productData类型从string更改为该类。