如何使用 JAXB2.0 禁用 DTD 提取

validation java jaxb dtd

2022-09-02 01:22:42

我试图使用JAXB来解开一些XML，我首先使用xjc创建。我不想对取消编组进行任何验证，但即使我已经根据 JAXB 文档禁用了验证，但这并没有阻止当它尝试运行时被抛出并且找不到模式。u.setSchema(null);FileNotFoundException

JAXBContext jc = JAXBContext.newInstance("blast");
Unmarshaller u = jc.createUnmarshaller();
u.setSchema(null);
return u.unmarshal(blast)

我见过类似的问题，通过将apache属性设置为，从验证中禁用SAX解析，但我无法让Unmarshaller使用我自己的sax解析器。http://apache.org/xml/features/validation/schemafalse

答案 1

基于@blaise-doughan和@aerobiotic的答案，这里有一个对我有用的解决方案：

import java.io.FileReader;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

public class Demo2 {

    public static void main(String[] args) throws Exception {

        JAXBContext jc = JAXBContext.newInstance(MyBean.class);

        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
        spf.setFeature("http://xml.org/sax/features/validation", false);

        XMLReader xmlReader = spf.newSAXParser().getXMLReader();
        InputSource inputSource = new InputSource(
                new FileReader("myfile.xml"));
        SAXSource source = new SAXSource(xmlReader, inputSource);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        MyBean foo = (MyBean) unmarshaller.unmarshal(source);
    }
}

答案 2

下面是示例代码，演示如何获取 JAXB （JSR-222） 实现以使用 SAX 解析器：

import java.io.FileReader;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

public class Demo {

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

        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
        XMLReader xmlReader = spf.newSAXParser().getXMLReader();
        InputSource inputSource = new InputSource(new FileReader("input.xml"));
        SAXSource source = new SAXSource(xmlReader, inputSource);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Foo foo = (Foo) unmarshaller.unmarshal(source);
        System.out.println(foo.getValue());
    }

}