使用 EclipseLink MOXy 解组时忽略 DTD答案

【问题标题】：Ignoring DTDs when unmarshalling with EclipseLink MOXy使用 EclipseLink MOXy 解组时忽略 DTD
【发布时间】：2012-10-15 15:34:02
【问题描述】：

当尝试使用 EclipseLink MOXy 将一些 XML 解组到 POJO 时，我得到了一个 FileNotFoundException，它正在寻找文档的 DTD 作为相对路径。

Exception in thread "main" org.springframework.oxm.UnmarshallingFailureException: JAXB unmarshalling exception; nested exception is javax.xml.bind.UnmarshalException
 - with linked exception:
[java.io.FileNotFoundException: C:\Users\deejay\Documents\workspace-sts-3.0.0.RELEASE\moxy-test\ieee_idams_exchange.dtd (The system cannot find the file specified)]
    at org.springframework.oxm.jaxb.Jaxb2Marshaller.convertJaxbException(Jaxb2Marshaller.java:761)
    at org.springframework.oxm.jaxb.Jaxb2Marshaller.unmarshal(Jaxb2Marshaller.java:682)
    at org.springframework.oxm.jaxb.Jaxb2Marshaller.unmarshal(Jaxb2Marshaller.java:665)
    at com.mendeley.services.utility.EclipseLinkMarshaller.load(EclipseLinkMarshaller.java:29)
    at com.mendeley.MoxyTest.main(MoxyTest.java:31)

我根据this example 提供“外部化元数据”，所以我不知道为什么它甚至需要 DTD。如果我能让它忽略 DTD，或者不尝试解决它，那就太好了。

【问题讨论】：

标签： java jaxb eclipselink moxy spring-oxm

【解决方案1】：

您可以从禁用了 DTD 支持的 XMLStreamReader 解组：

import javax.xml.bind.*;
import javax.xml.stream.*;
import javax.xml.transform.stream.StreamSource;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Customer.class);

        XMLInputFactory xif = XMLInputFactory.newFactory();
        xif.setProperty(XMLInputFactory.SUPPORT_DTD, false);
        XMLStreamReader xsr = xif.createXMLStreamReader(new StreamSource("input.xml"));

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Customer customer = (Customer) unmarshaller.unmarshal(xsr);
    }

}

额外

如果您想编写 DTD 声明，您可以执行以下操作：

    XMLOutputFactory xof = XMLOutputFactory.newFactory();
    XMLStreamWriter xsw = xof.createXMLStreamWriter(System.out);
    xsw.writeDTD("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">");

    Marshaller marshaller = jc.createMarshaller();
    marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
    marshaller.marshal(html, xsw);
    xsw.close();

【讨论】：