如何使用JAXB2.0禁用DTD提取

Question

我想使用JAXB unmashall一些XML，我首先使用xjc创建。我不想对解组进行任何验证，但即使我已根据与u.setSchema(null);的JAXB文档禁用了验证，但这并未阻止FileNotFoundException在尝试运行时发生，并且无法找到架构。

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

我已经看到了致残SAX由Apache属性设置http://apache.org/xml/features/validation/schema到false从验证分析类似的问题，但我不能让着Unmarshaller用自己的SAX解析器。

Answer 1

以下是一个演示如何获得JAXB (JSR-222)实现用你的SAX示例代码解析：

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()); 
    } 

} 

Answer 2

您可以直接从javax.xml.transform.sax.SAXSource创建Unmarshaller。

此页面上看到的例子：http://docs.oracle.com/cd/E17802_01/webservices/webservices/docs/1.6/api/javax/xml/bind/Unmarshaller.html

比你“只”需要提供自己的URIResolver到的SAXSource

Answer 3

看看这个资源 https://java.net/projects/jaxb/lists/users/archive/2003-11/message/60 它为我当最好的答案是不工作。

Answer 4

大厦从@布莱斯 - doughan和@aerobiotic的答案，这里是为我工作的解决方案：

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); 
    } 
}