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2010-06-01T07:19:27Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:47Z

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== Getting the Value of an Entity Reference in a DOM Document ==



<source lang="java">

import java.io.File;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.rument;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.EntityReference;
import org.w3c.dom.Text;
public class Main {
public static void main(String[] argv) throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(true);
factory.setExpandEntityReferences(false);
Document doc = factory.newDocumentBuilder().parse(new File("filename"));
Element root = doc.getDocumentElement();
EntityReference eref = (EntityReference) root.getFirstChild();
Comment comment = (Comment) eref.getFirstChild();
Element elem = (Element) eref.getFirstChild().getNextSibling();
Text text = (Text) eref.getLastChild();
}
}

</source>



== implements EntityResolver ==



<source lang="java">

import java.io.IOException;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class SimpleEntityResolver implements EntityResolver {
private static final String USAGE_TERMS_ID = "http://www.n.ru/t.xml";
private static final String USAGE_TERMS_LOCAL_URI = "C:\\t.xml";
public InputSource resolveEntity(String publicID, String systemID) throws IOException,
SAXException {
if (systemID.equals(USAGE_TERMS_ID)) {
return new InputSource(USAGE_TERMS_LOCAL_URI);
}
return null;
}
}

</source>



== Intercepting All Accesses to External Entities During XML SAX Parsing ==



<source lang="java">

import java.io.File;
import java.io.FileReader;
import java.net.URI;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
public class Main {
public static void main(String[] argv) throws Exception {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
builder.setEntityResolver(new MyResolver());
Document doc = builder.parse(new File("infilename.xml"));
}
}
class MyResolver implements EntityResolver {
public InputSource resolveEntity(String publicId, String systemId) {
try {
URI uri = new URI(systemId);
if ("file".equals(uri.getScheme())) {
String filename = uri.getSchemeSpecificPart();
return new InputSource(new FileReader(filename));
}
} catch (Exception e) {
}
return null;
}
}

</source>



== Preventing Expansion of Entity References While Parsing an XML File ==



<source lang="java">

import java.io.File;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
public class Main {
public static void main(String[] argv) throws Exception{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(true);
// Prevent expansion of entity references
factory.setExpandEntityReferences(false);
// Create the builder and parse the file
Document doc = factory.newDocumentBuilder().parse(new File("filename"));
}
}

</source>



== Resolves an entity reference or character reference to its value. ==



<source lang="java">

/*
* Copyright Aduna (http://www.aduna-software.ru/) (c) 1997-2006.
*
* Licensed under the Aduna BSD-style license.
*/

public class Utils {
/**
* Resolves an entity reference or character reference to its value.
*
* @param entName The "name" of the reference. This is the string between
* & and ;, e.g. amp, quot, #65 or #x41.
* @return The value of the supplied reference, or the reference itself
* if it could not be resolved.
*/
public static String resolveEntity(String entName) {
if (entName.startsWith("#")) {
// character reference
StringBuilder sb = new StringBuilder();
if (entName.charAt(1) == "x") {
// Hex-notation
sb.append((char)Integer.parseInt(entName.substring(2), 16));
}
else {
// Dec-notation
sb.append((char)Integer.parseInt(entName.substring(1)));
}
return sb.toString();
}
else if (entName.equals("apos")) {
return """;
}
else if (entName.equals("quot")) {
return "\"";
}
else if (entName.equals("gt")) {
return ">";
}
else if (entName.equals("lt")) {
return "<";
}
else if (entName.equals("amp")) {
return "&";
}
else {
return entName;
}
}
}

</source>



== Resolving entities found in source XML during parsing ==



<source lang="java">

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
public class Main {
public static void main(String[] argv) throws Exception {
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setValidating(true);
SAXParser parser = factory.newSAXParser();
SaxHandler handler = new SaxHandler();
parser.parse("sample.xml", handler);
}
}
class SaxHandler extends DefaultHandler {
public InputSource resolveEntity(String publicId, String systemId) {
if (systemId.equals("http://www.my-company.ru/order-1.0.dtd")) {
return new InputSource(getClass().getResourceAsStream("order.dtd"));
} else {
return null;
}
}
public void startElement(String uri, String localName, String qName, Attributes attrs)
throws SAXException {
if (qName.equals("order")) {
}
}
public void error(SAXParseException ex) throws SAXException {
System.out.println("ERROR: [at " + ex.getLineNumber() + "] " + ex);
}
public void fatalError(SAXParseException ex) throws SAXException {
System.out.println("FATAL_ERROR: [at " + ex.getLineNumber() + "] " + ex);
}
public void warning(SAXParseException ex) throws SAXException {
System.out.println("WARNING: [at " + ex.getLineNumber() + "] " + ex);
}
}

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010