Question

我正在使用JAXB 2.0 JDK 6来将XML实例解组为POJO。

为了添加一些自定义验证，我已经在属性的setter中插入了一个验证调用，但是尽管它是私有的，但似乎unmarshaller不会调用setter而是直接修改私有字段。

对我来说，每次解组调用都会对此特定字段进行自定义验证至关重要。

我该怎么办？

代码：

@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使用字段访问权限，因为您通过使用@XmlValue注释字段并声明@XmlAccessorType(XmlAccessType.FIELD)来将其配置为使用字段访问权限。

要使用属性访问权限，您可以将@XmlValue移至getter或setter（根本不需要@XmlAccessorType）。

在解组对象时，JAXB不会调用setter

1 个答案: