java – JsonIgnoreProperties不适用于JsonCreator构造函数

2023年3月28日 381次阅读

我有以下实体作为目标POJO用于​​控制器的一个请求：

Entity
@Table(name="user_account_entity")
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonSerialize(using = UserAccountSerializer.class)
public class UserAccountEntity implements UserDetails {
    //...
    private String username;

    private String password;

    @PrimaryKeyJoinColumn
    @OneToOne(mappedBy= "userAccount", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private UserEntity user;

    @PrimaryKeyJoinColumn
    @OneToOne(mappedBy= "userAccount", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private UserAccountActivationCodeEntity activationCode;

    @JsonCreator
    public UserAccountEntity(@JsonProperty(value="username", required=true) final String username, @JsonProperty(value="password", required=true) final String password) {
      //....
    }

    public UserAccountEntity() {}

    //.....
}

当我在请求中放入意外字段时,它会抛出MismatchedInputException并失败并显示以下消息：

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.myproject.project.core.entity.userAccountActivationCode.UserAccountActivationCodeEntity` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('9WL4J')
 at [Source: (PushbackInputStream); line: 4, column: 20] (through reference chain: com.myproject.project.core.entity.userAccount.UserAccountEntity["activationCode"])

在控制器中我有：

@InitBinder
public void binder(WebDataBinder binder) {
    binder.addValidators(new CompoundValidator(new Validator[] {
            new UserAccountValidator(),
            new UserAccountActivationCodeDTOValidator() }));
}

我发出请求的端点是：

@Override
public UserAccountEntity login(@Valid @RequestBody UserAccountEntity account,
        HttpServletResponse response) throws MyBadCredentialsException, InactiveAccountException {
    return userAccountService.authenticateUserAndSetResponsenHeader(
            account.getUsername(), account.getPassword(), response);
}

更新1

UserAccountSerializer的代码：

public class UserAccountSerializer extends StdSerializer<UserAccountEntity> {

    public UserAccountSerializer() {
        this(null);
    }

    protected UserAccountSerializer(Class<UserAccountEntity> t) {
        super(t);
    }

    @Override
    public void serialize(UserAccountEntity value, JsonGenerator gen,
            SerializerProvider provider) throws IOException {
        gen.writeStartObject();
        gen.writeStringField("id", value.getId());
        gen.writeStringField("username", value.getUsername());
        gen.writeEndObject();
    }

}

最佳答案 因为你的json中有错误,所以会触发错误：

"activationCode" : "9WL4J"

但杰克逊不知道如何将字符串“9WL4J”映射到对象UserAccountActivationCodeEntity

我猜字符串“9WL4J”是UserAccountActivationCodeEntity的主键id的值,在这种情况下你应该在json中：

"activationCode" : {"id" : "9WL4J"}

如果不是这种情况,请使用自定义Deseralizer告诉Jackson如何将字符串映射到对象.您可以在实体上使用@JsonDeserialize.

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