如何向用户报告丢失的DTD文件？

Question

给予代码：

public class ModelHandler 
{ 
//members 
private DocumentBuilderFactory m_domFactory; 
private DocumentBuilder m_builder; 
private Document m_doc; 
private XPathFactory m_factory; 
private List<String> m_inputErrorLog; 


public void openXmlFile(File file) 
{ 

    this.m_inputErrorLog = new LinkedList<String>() ; 

    try 
    { 
     m_builder = m_domFactory.newDocumentBuilder(); 
    } 

    catch (ParserConfigurationException ex) { m_inputErrorLog.add(ex.getMessage());} 


     try 
     { 
      m_doc = m_builder.parse(file);   
     } 
     catch (Exception ex) 
     { 
      m_inputErrorLog.add(ex.getMessage());  
      m_domFactory.setValidating(false); 
     }    

     try 
     { 
      getNodesList("/"+m_doc.getDocumentElement().getNodeName()); 
     } 
     catch (XPathExpressionException ex) { 
     m_inputErrorLog.add(ex.getMessage()); 
    } 
} 

我想提出来的DTD文件丢失的用户，与GUI工作时。

我该怎么做，而试图打开XML文件？

感谢

Answer 1

这里是解决方案，任何人谁也可能需要一些日子：

import java.io.IOException; 
// DOM 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
// SAX 
import javax.xml.parsers.SAXParser; 
import javax.xml.parsers.SAXParserFactory; 
import org.xml.sax.XMLReader; 

import javax.xml.parsers.ParserConfigurationException; 
import org.xml.sax.ErrorHandler; 
import org.xml.sax.SAXException; 
import org.xml.sax.SAXParseException; 
import org.xml.sax.InputSource; 

public class XMLUtils { 

    private XMLUtils() {} 

    // validate using DOM (DTD as defined in the XML) 
    public static boolean validateWithDTDUsingDOM(String xml) 
    throws ParserConfigurationException, IOException 
    { 
    try { 
     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
     factory.setValidating(true); 
     factory.setNamespaceAware(true); 

     DocumentBuilder builder = factory.newDocumentBuilder(); 

     builder.setErrorHandler(
      new ErrorHandler() { 
      public void warning(SAXParseException e) throws SAXException { 
       System.out.println("WARNING : " + e.getMessage()); // do nothing 
      } 

      public void error(SAXParseException e) throws SAXException { 
       System.out.println("ERROR : " + e.getMessage()); 
       throw e; 
      } 

      public void fatalError(SAXParseException e) throws SAXException { 
       System.out.println("FATAL : " + e.getMessage()); 
       throw e; 
      } 
      } 
     ); 
     builder.parse(new InputSource(xml)); 
     return true; 
    } 
    catch (ParserConfigurationException pce) { 
     throw pce; 
    } 
    catch (IOException io) { 
     throw io; 
    } 
    catch (SAXException se){ 
     return false; 
    } 
    } 


    // validate using SAX (DTD as defined in the XML) 
    public static boolean validateWithDTDUsingSAX(String xml) 
    throws ParserConfigurationException, IOException 
    { 
    try { 

     SAXParserFactory factory = SAXParserFactory.newInstance(); 
     factory.setValidating(true); 
     factory.setNamespaceAware(true); 

     SAXParser parser = factory.newSAXParser(); 

     XMLReader reader = parser.getXMLReader(); 
     reader.setErrorHandler(
      new ErrorHandler() { 
      public void warning(SAXParseException e) throws SAXException { 
       System.out.println("WARNING : " + e.getMessage()); // do nothing 
      } 

      public void error(SAXParseException e) throws SAXException { 
       System.out.println("ERROR : " + e.getMessage()); 
       throw e; 
      } 

      public void fatalError(SAXParseException e) throws SAXException { 
       System.out.println("FATAL : " + e.getMessage()); 
       throw e; 
      } 
      } 
     ); 
     reader.parse(new InputSource(xml)); 
     return true; 
    } 
    catch (ParserConfigurationException pce) { 
     throw pce; 
    } 
    catch (IOException io) { 
     throw io; 
    } 
    catch (SAXException se){ 
     return false; 
    } 
    } 

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

    System.out.println(XMLUtils.validateWithDTDUsingDOM("c:/temp/howto.xml")); 
    System.out.println(XMLUtils.validateWithDTDUsingSAX("c:/temp/howto.xml")); 
    /* 
     output : 
       true 
       true 
    */   
    } 
}