mytexthandler.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.PrintWriter;
import java.util.Vector;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
//Example XML document
/*
 An XML Document Containing a Simple Contact List
Start example

<?xml version="1.0" standalone="yes"?>

<folks>
    <person>
        <phone>306 555-9999</phone>
        <email>[e-mail]</email>
        <name>Yin, Joe</name>
    </person>
    <person>
        <phone>704 555-0000</phone>
        <name>Pet, Rob</name>
        <email>[e-mail]</email>
    </person>
</folks>

*/ 
public class MyTextHandler implements ContentHandler {
	  private boolean insideNameElement = false;

	  private boolean insidePhoneElement = false;

	  private boolean insideEmailElement = false;

	  private Person person;

	  private Vector personVec;

	  private PrintWriter out;

	  public MyTextHandler(PrintWriter out) {
	    this.out = out;
	    personVec = new Vector();
	  }

	  public void setDocumentLocator(Locator locator) {
	  }

	  public void startDocument() {
	    putCols(" name", " phone", " email");
	    putCols(" ----", " -----", " -----");
	  }

	  public void endDocument() {
	    int k1 = 1;
	    while (k1 < personVec.size()) {
	      int k0 = k1 - 1;
	      Person p0 = (Person) personVec.elementAt(k0);
	      Person p1 = (Person) personVec.elementAt(k1);
	      if (p0.getName().compareTo(p1.getName()) > 0) {
	        personVec.setElementAt(p0, k1);
	        personVec.setElementAt(p1, k0);
	        if (k1 > 1)
	          k1--;
	      } else {
	        k1++;
	      }
	    }

	    for (int i = 0; i < personVec.size(); i++) {
	      Person p = (Person) personVec.elementAt(i);
	      putCols(p.getName(), p.getPhone(), p.getEmail());
	    }
	  }

	  public void startPrefixMapping(String prefix, String uri) {
	  }

	  public void endPrefixMapping(String prefix) {
	  }

	  public void startElement(String namespaceURI, String localName,
	      String qName, Attributes atts) {
	    if (localName.equals("person")) {
	      person = new Person();
	    } else if (localName.equals("name")) {
	      insideNameElement = true;
	    } else if (localName.equals("phone")) {
	      insidePhoneElement = true;
	    } else if (localName.equals("email")) {
	      insideEmailElement = true;
	    }
	  }

	  public void endElement(String namespaceURI, String localName, String qName) {
	    if (localName.equals("person")) {
	      if (person != null)
	        personVec.addElement(person);
	    } else if (localName.equals("name")) {
	      insideNameElement = false;
	    } else if (localName.equals("phone")) {
	      insidePhoneElement = false;
	    } else if (localName.equals("email")) {
	      insideEmailElement = false;
	    }
	  }

	  public void characters(char[] ch, int start, int length) {
	    String str = "";
	    for (int i = start; i < start + length; i++)
	      str += ch[i];
	    if (insideNameElement)
	      person.setName(str);
	    else if (insidePhoneElement)
	      person.setPhone(str);
	    else if (insideEmailElement)
	      person.setEmail(str);
	  }

	  public void ignorableWhitespace(char[] ch, int start, int length) {
	  }

	  public void processingInstruction(String target, String data) {
	  }

	  public void skippedEntity(String name) {
	  }

	  private void putCols(String col1, String col2, String col3) {
	    String lout = col1;
	    while (lout.length() < 25)
	      lout += " ";
	    lout += col2;
	    while (lout.length() < 50)
	      lout += " ";
	    lout += col3;
	    out.println(lout);
	  }
	}

//	 A Class for Holding Person Information

	class Person {
	  private String name = null;

	  private String phone = null;

	  private String email = null;

	  public void setName(String value) {
	    name = value;
	  }

	  public void setPhone(String value) {
	    phone = value;
	  }

	  public void setEmail(String value) {
	    email = value;
	  }

	  public String getName() {
	    if (name == null)
	      return ("none");
	    return (name);
	  }

	  public String getPhone() {
	    if (phone == null)
	      return ("none");
	    return (phone);
	  }

	  public String getEmail() {
	    if (email == null)
	      return ("none");
	    return (email);
	  }
	}