saxcopy.java

全面的展示了SAX解析XML文件的强大威力

/*
 * Created on 2005-11-20
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class SAXCopy {

	static public void main(String[] arg) {
	    String infilename = null;
	    String outfilename = null;
	    if (arg.length == 2) {
	      infilename = arg[0];
	      outfilename = arg[1];
	    } else {
	      usage();
	    }

	    try {
	      SAXParserFactory spf = SAXParserFactory.newInstance();
	      SAXParser parser = spf.newSAXParser();
	      XMLReader reader = parser.getXMLReader();
	      reader.setErrorHandler(new MyErrorHandler());
	      FileOutputStream fos = new FileOutputStream(outfilename);
	      PrintWriter out = new PrintWriter(fos);
	      MyCopyHandler duper = new MyCopyHandler(out);
	      reader.setContentHandler(duper);
	      InputSource is = new InputSource(infilename);
	      reader.parse(is);
	      out.close();
	    } catch (SAXException e) {
	      System.exit(1);
	    } catch (ParserConfigurationException e) {
	      System.err.println(e);
	      System.exit(1);
	    } catch (IOException e) {
	      System.err.println(e);
	      System.exit(1);
	    }
	  }

	  private static void usage() {
	    System.err.println("Usage: SAXCopy <infile> <outfile>");
	    System.exit(1);
	  }
	}

	class MyCopyHandler implements ContentHandler {
	  private boolean namespaceBegin = false;

	  private String currentNamespace;

	  private String currentNamespaceUri;

	  private Locator locator;

	  private PrintWriter out;

	  public MyCopyHandler(PrintWriter out) {
	    this.out = out;
	  }

	  public void setDocumentLocator(Locator locator) {
	    this.locator = locator;
	  }

	  public void startDocument() {
	    out.println("<?xml version=\"1.0\"?>");
	    out.println();
	  }

	  public void endDocument() {
	  }

	  public void startPrefixMapping(String prefix, String uri) {
	    namespaceBegin = true;
	    currentNamespace = prefix;
	    currentNamespaceUri = uri;
	  }

	  public void endPrefixMapping(String prefix) {
	  }

	  public void startElement(String namespaceURI, String localName,
	      String qName, Attributes atts) {
	    out.print("<" + qName);
	    if (namespaceBegin) {
	      out.print(" xmlns:" + currentNamespace + "=\""
	          + currentNamespaceUri + "\"");
	      namespaceBegin = false;
	    }
	    for (int i = 0; i < atts.getLength(); i++) {
	      out.print(" " + atts.getQName(i) + "=\\" + atts.getValue(i) + "\"");
	    }
	    out.print(">");
	  }

	  public void endElement(String namespaceURI, String localName, String qName) {
	    out.print("</" + qName + ">");
	  }

	  public void characters(char[] ch, int start, int length) {
	    for (int i = start; i < start + length; i++)
	      out.print(ch[i]);
	  }

	  public void ignorableWhitespace(char[] ch, int start, int length) {
	    for (int i = start; i < start + length; i++)
	      out.print(ch[i]);
	  }

	  public void processingInstruction(String target, String data) {
	    out.print("<?" + target + " " + data + "?>");
	  }

	  public void skippedEntity(String name) {
	    out.print("&" + name + ";");
	  }
	}

	class MyErrorHandler implements ErrorHandler {
	  public void warning(SAXParseException e) throws SAXException {
	    show("Warning", e);
	    throw (e);
	  }

	  public void error(SAXParseException e) throws SAXException {
	    show("Error", e);
	    throw (e);
	  }

	  public void fatalError(SAXParseException e) throws SAXException {
	    show("Fatal Error", e);
	    throw (e);
	  }

	  private void show(String type, SAXParseException e) {
	    System.out.println(type + ": " + e.getMessage());
	    System.out.println("Line " + e.getLineNumber() + " Column "
	        + e.getColumnNumber());
	    System.out.println("System ID: " + e.getSystemId());
	  }

}