在解組對象時，JAXB不會調用setter

Question

我正在使用JAXB 2.0 JDK 6來將XML實例解組為POJO。

為了添加一些自定義驗證，我已經將一個驗證調用插入到屬性的setter中，盡管它是私有的，但似乎unmarshaller不會調用setter但直接修改私有字段。

對我來說，每個unmarshall調用都會針對此特定字段進行自定義驗證，這一點至關重要。

我該怎么辦？

碼：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "LegalParams", propOrder = {
    "value"
})
public class LegalParams {

    private static final Logger LOG = Logger.getLogger(LegalParams.class);

    @XmlTransient
    private LegalParamsValidator legalParamValidator;

    public LegalParams() {

        try {
            WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
            LegalParamsFactory legalParamsFactory = (LegalParamsFactory) webApplicationContext.getBean("legalParamsFactory");
            HttpSession httpSession = SessionHolder.getInstance().get();
            legalParamValidator = legalParamsFactory.newLegalParamsValidator(httpSession);
        }
        catch (LegalParamsException lpe) {
            LOG.warn("Validator related error occurred while attempting to construct a new instance of LegalParams");
            throw new IllegalStateException("LegalParams creation failure", lpe);
        }
        catch (Exception e) {
            LOG.warn("Spring related error occurred while attempting to construct a new instance of LegalParams");
            throw new IllegalStateException("LegalParams creation failure", e);
        }
    }

    @XmlValue
    private String value;

    /**
     * Gets the value of the value property.
     *
     * @return
     *     possible object is
     *     {@link String }
     *
     */
    public String getValue() {
        return value;
    }

    /**
     * Sets the value of the value property.
     *
     * @param value
     *     allowed object is
     *     {@link String }
     * @throws TestCaseValidationException
     *
     */
    public void setValue(String value) throws TestCaseValidationException {
        legalParamValidator.assertValid(value);
        this.value = value;
    }
}

Answer 1

JAXB使用字段訪問，因為您通過使用@XmlValue注釋字段並聲明@XmlAccessorType(XmlAccessType.FIELD)來將其配置為使用字段訪問。

要使用屬性訪問，可以將@XmlValue移動到getter或setter（根本不需要@XmlAccessorType ）。