根据这个xml文件，我们将Date Object设置如下。

/* 
 * Customers.java
 * Create @ 2004-4-27 22:04:45
 * by Jiabo
 */
import java.util.*;
/**
 * Customers
 * Create @ 2004-4-27 22:04:45
 * by Jiabo
 */
public class Customers {
  private Vector customers;

  public Customers() {
    customers = new Vector();
  }

  public void addCustomer(Customer customer) {
    customers.add(customer);
  }

  public String toString() {
    String newline = System.getProperty("line.separator");
    StringBuffer buf = new StringBuffer();

    for (int i = 0; i < customers.size(); i++) {
      buf.append(customers.elementAt(i)).append(newline);
    }
    return buf.toString(); 
  }
}

class Customer {
  private String id;
  private String name;
  private String address;

  /**
   * @return
   */
  public String getAddress() {
    return address;
  }

  /**
   * @return
   */
  public String getId() {
    return id;
  }

  /**
   * @return
   */
  public String getName() {
    return name;
  }

  /**
   * @param string
   */
  public void setAddress(String string) {
    address = string;
  }

  /**
   * @param string
   */
  public void setId(String string) {
    id = string;
  }

  /**
   * @param string
   */
  public void setName(String string) {
    name = string;
  }
	
  public String toString(){
    return "Customer: ID=''''" + id + "'''' Name=''''" + name + 
      "'''' Address=''''" + address + "''''";
  }
}

接下来是xml的处理器。

/*
 * Test.java
 * Created on 2004-4-10
 * by Jiabo
 */
import java.util.*;

import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
/**
 * Test
 * Create on 2004-4-10 19:20:27
 * by Jiabo
 */
public class Unmarshaller extends DefaultHandler {
  private Customers customers;
  private Stack stack;
  private boolean isStackReadyForText;
  private Locator locator;

  /**
   * init
   */
  public Unmarshaller() {
    stack = new Stack();
    isStackReadyForText = false;
  }
  /**
   * @return customers
   */
  public Customers getCustomers() {
    return customers;
  }
  /**
   * callbacks
   */
  public void setDocumentLocator(Locator rhs) {
    locator = rhs;
  }

  //==========================================
  // SAX DocumentHandler methods
  //==========================================

  public void startElement(
    String uri,
    String sName,
    String qName,
    Attributes attrs) {
      isStackReadyForText = false;

      if (sName.equals("customers")) {
        stack.push(new Customers());
      } else if (sName.equals("customer")) {
        stack.push(new Customer());
      } else if (
        sName.equals("id")
        || sName.equals("name")
        || sName.equals("address")) {
          stack.push(new StringBuffer());
          isStackReadyForText = true;
      } else {
      }
    }

  public void endElement(String namespaceURI, String sName, String qName){
    isStackReadyForText = false;
    Object temp = stack.pop();

    if (sName.equals("customers")) {
      customers = (Customers) temp;
    } else if (sName.equals("customer")) {
      ((Customers) stack.peek()).addCustomer((Customer) temp);
    } else if (sName.equals("id")) {
      ((Customer) stack.peek()).setId(temp.toString());
    } else if (sName.equals("name")) {
      ((Customer) stack.peek()).setName(temp.toString());
    } else if (sName.equals("address")) {
      ((Customer) stack.peek()).setAddress(temp.toString());
    }
  }

  public void characters(char[] data, int start, int length) {
    if (isStackReadyForText == true) {
      ((StringBuffer) stack.peek()).append(data, start, length);
    } else {
    }
  }
}

在这里我们处理xml文件的思路非常简单，就是使用一个栈，遇到"<"表示element的开始，然后就看与我们既定的Data Object的名字是否相符合，符合就new一个该对象，并将其压栈；不符合就什么都不做，sax的处理框架就会自己去处理下一个element。而当遇到"/>"的时候我们还是看的他名字与DataObject的名字是否相符，相符合的话就出栈，然后set进对象里面。如此循环，就处理完了我们上面那个简单得xml文件。

我们需要做的事情就只有这些。其他如何处理的，handler回自己调用相应的startElement，endElement等方法去处理。

以下是程序的入口：

/* 
 * main.java
 * Create @ 2004-4-27 22:18:41
 * by Jiabo
 */
import java.io.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
/**
 * main
 * Create @ 2004-4-27 22:18:41
 * by Jiabo
 */
public class Main {
  public static void main(String args[]) {

    Customers customers = null;
    if (args.length != 1) {
      System.err.println("Usage: cmd filename");
      System.exit(1);
    }
    try {
      Unmarshaller handler = 	new Unmarshaller();
      SAXParserFactory factory = SAXParserFactory.newInstance(); 
      SAXParser saxParser = factory.newSAXParser();
			
      File file = new File(args[0]);
      InputSource src = new InputSource(new FileInputStream(file));
      saxParser.parse( src ,handler); 

      customers = handler.getCustomers();
    } catch (Throwable t) {
      t.printStackTrace();
    }

    System.out.println(customers);
  }
}
				
										
					

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