JsonIgnoreProperties 不适用于 JsonCreator 构造函数

Question

我有以下实体，我将其用作对控制器的请求之一的目标 POJO：

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() }));

}

我提出请求的端点是：

@Override

public UserAccountEntity login(@Valid @RequestBody UserAccountEntity account,

        HttpServletResponse response) throws MyBadCredentialsException, InactiveAccountException {

    return userAccountService.authenticateUserAndSetResponsenHeader(

            account.getUsername(), account.getPassword(), response);

}

Answer 1

触发错误是因为您在 json 中有："activationCode" : "9WL4J"然而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，您应该在 json 中有："activationCode" : {"id" : "9WL4J"}如果不是这种情况，请使用自定义 Deseralizer 来告诉 Jackson 如何将字符串映射到对象。您可以在您的实体上使用 @JsonDeserialize。