只有在我使用Jackson的字段级反序列化时才会出现400 Bad Request
错误。如果我在类级别进行反序列化,那么它可以正常工作。我只想传递用户id而不是整个用户对象,因此字段级反序列化。就我所见,解串器甚至没有被调用。我的代码如下:
模特课:
@Entity
@Table(name = "expense")
@JsonIgnoreProperties(ignoreUnknown = true)
public class Expense implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
private long id;
@Embedded
@AttributeOverrides({
@AttributeOverride(name = "receiptPicture", column = @Column(name = "receipt_picture"))
})
private ExpenseDetail detail;
@ManyToOne
@JoinColumn(name = "given_by")
@JsonDeserialize(using = ExpenseGivenByDeserializer.class)
private User givenBy;
@ManyToOne
@JoinColumn(name = "given_for")
@JsonIgnore
private House givenFor;
@ManyToMany(cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
@JoinTable(
name = "users_approved_expenses",
joinColumns = {@JoinColumn(name = "expense_id")},
inverseJoinColumns = {@JoinColumn(name = "user_id")}
)
@JsonIgnore
private List<User> approvedUsers;
@Embedded
@JsonIgnore
private Timer timer;
//....setters and getters
反序列化程序类:
@Component
public class ExpenseGivenByDeserializer extends JsonDeserializer<User> {
@Autowired
private UserDao userDao;
@Override
public User deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
ObjectCodec oc = jp.getCodec();
JsonNode node = oc.readTree(jp);
long id = node.get("givenBy").asLong();
System.out.println("herer");
return userDao.find(id);
}
}
我发布这个:
{
"detail" : {
"description" : "rice 2 kg",
"receiptPicture" : "../image/kk.jpg",
"cost" : "1500"
},
"givenBy": 15
}
答案 0 :(得分:1)
在您的反序列化器中,node
是您需要的 值节点 。 (查看node.isValueNode()
)。
这就够了
JsonNode node = oc.readTree(jp);
long id = node.asLong();
System.out.println("herer"); //prints!
return userDao.find(id);